Detectionmediumtest

Verclsid.exe Runs COM Object

Detects when verclsid.exe is used to run COM object via GUID

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Victor Sergeev, oscd.communityCreated Fri Oct 09Updated Tue Oct 07d06be4b9-8045-428b-a567-740a26d9db25windows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection_img:
        - Image|endswith: '\verclsid.exe'
        - OriginalFileName: 'verclsid.exe'
    selection_cli:
        CommandLine|contains|all:
            - '/S'
            - '/C'
    filter_main_runtimebroker:
        ParentImage|endswith: 'C:\Windows\System32\RuntimeBroker.exe'
        CommandLine|contains|all:
            - 'verclsid.exe" /S /C {'
            - '} /I {'
    condition: all of selection_* and not 1 of filter_main_*