Detectionmediumtest

Suspicious PowerShell Invocation From Script Engines

Detects suspicious powershell invocations from interpreters or unusual programs

Convert In Phoenix Studio

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

Launch

Florian Roth (Nextron Systems)Created Wed Jan 16Updated Thu Jan 0595eadcb2-92e4-4ed1-9031-92547773a6dbwindows

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:
        ParentImage|endswith:
            - '\wscript.exe'
            - '\cscript.exe'
        Image|endswith:
            - '\powershell.exe'
            - '\pwsh.exe'
    filter_health_service:
        CurrentDirectory|contains: '\Health Service State\'
    condition: selection and not 1 of filter_*