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Update Active Directory Attack.md

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Justin Perdok 2020-08-17 13:15:33 +00:00 committed by GitHub
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Methodology and Resources/Active Directory Attack.md
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@ -1152,7 +1152,11 @@ Set-DomainObject <UserName> -Set @{serviceprincipalname='ops/whatever1'}
##### GenericWrite and Remote Connection Manager
In Windows Server 2012 R2 and earlier versions, when a user logs on to a server with the Terminal Server (TS)/Remote Desktop Session Host (RDSH) role installed, the Remote Connection Manager process contacts the domain controller to query the configurations that are specific to Remote Desktop for the user object in Active Directory. These settings are then applied during the user’s login process to customise their sessions. One of things that can be configured is a program used to replace the users graphical environment. - https://sensepost.com/blog/2020/ace-to-rce/
> Now let’s say you are in an Active Directory environment that still actively uses a Windows Server version that has RCM enabled, or that you are able to enable RCM on a compromised RDSH, what can we actually do ? Well each user object in Active Directory has a tab called ‘Environment’.
>
> This tab includes settings that, among other things, can be used to change what program is started when a user connects over the Remote Desktop Protocol (RDP) to a TS/RDSH in place of the normal graphical environment. The settings in the ‘Starting program’ field basically function like a windows shortcut, allowing you to supply either a local or remote (UNC) path to an executable which is to be started upon connecting to the remote host. During the logon process these values will be queried by the RCM process and run whatever executable is defined. - https://sensepost.com/blog/2020/ace-to-rce/
:warning: The RCM is only active on Terminal Servers/Remote Desktop Session Hosts. The RCM has also been disabled on recent version of Windows (>2016), it requires a registry change to re-enable.
```powershell
$UserObject = ([ADSI]("LDAP://CN=User,OU=Users,DC=ad,DC=domain,DC=tld"))
@ -1161,6 +1165,8 @@ $UserObject.TerminalServicesWorkDirectory = "C:\"
$UserObject.SetInfo()
```
NOTE: To not alert the users the payload should hide its own process window and spawn the normal graphical enviorment.
#### WriteDACL
To abuse WriteDacl to a domain object, you may grant yourself the DcSync privileges. It is possible to add any given account as a replication partner of the domain by applying the following extended rights Replicating Directory Changes/Replicating Directory Changes All. [Invoke-ACLPwn](https://github.com/fox-it/Invoke-ACLPwn) is a tool that automates the discovery and pwnage of ACLs in Active Directory that are unsafe configured : `./Invoke-ACL.ps1 -SharpHoundLocation .\sharphound.exe -mimiKatzLocation .\mimikatz.exe -Username 'user1' -Domain 'domain.local' -Password 'Welcome01!'`
@ -1710,3 +1716,4 @@ CME 10.XXX.XXX.XXX:445 HOSTNAME-01 [+] DOMAIN\COMPUTER$ 6b3723410a3c5
* [GPO Abuse - Part 2 - RastaMouse - 13 January 2019](https://rastamouse.me/2019/01/gpo-abuse-part-2/)
* [Abusing GPO Permissions - harmj0y - March 17, 2016](https://www.harmj0y.net/blog/redteaming/abusing-gpo-permissions/)
* [How To Attack Kerberos 101 - m0chan - July 31, 2019](https://m0chan.github.io/2019/07/31/How-To-Attack-Kerberos-101.html)
* [ACE to RCE - @JustinPerdok - July 24, 2020](https://sensepost.com/blog/2020/ace-to-rce/)