Runscripthelper.exe

Commands

1. ExecuteUser T1218

   Bypass constrained language mode and execute Powershell script

   runscripthelper.exe surfacecheck \\?\{PATH_ABSOLUTE:.txt} {PATH_ABSOLUTE:folder}

   Execute the PowerShell script with .txt extension

   os: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10

   Execute: PowerShell

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/process_creation/proc_creation_win_lolbin_runscripthelper.yml
• BlockRule https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules
• IOCEvent ID 4104 - Microsoft-Windows-PowerShell/Operational
• IOCEvent ID 400 - Windows PowerShell

Resources

• https://posts.specterops.io/bypassing-application-whitelisting-with-runscripthelper-exe-1906923658fc