Verclsid.exe

Used to verify a COM object before it is instantiated by Windows Explorer

Paths

• C:\Windows\System32\verclsid.exe
• C:\Windows\SysWOW64\verclsid.exe

Commands

Execute

Used to verify a COM object before it is instantiated by Windows Explorer

Use case: Run a COM object created in registry to evade defensive counter measures

Privileges: User

verclsid.exe /S /C {CLSID}

Detection

• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_verclsid_runs_com.yml
• Splunk: https://github.com/splunk/security_content/blob/a1afa0fa605639cbef7d528dec46ce7c8112194a/detections/endpoint/verclsid_clsid_execution.yml

Resources

• https://gist.github.com/NickTyrer/0598b60112eaafe6d07789f7964290d5
• https://bohops.com/2018/08/18/abusing-the-com-registry-structure-part-2-loading-techniques-for-evasion-and-persistence/