SigmaHQ/rules/windows/sysmon/sysmon_susp_powershell_parent_combo.yml

title: Suspicious PowerShell Invocation based on Parent Process
status: experimental
description: Detects suspicious powershell invocations from interpreters or unusual programs
author: Florian Roth
references:
    - https://www.carbonblack.com/2017/03/15/attackers-leverage-excel-powershell-dns-latest-non-malware-attack/
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 1
        ParentImage:
            - '*\wscript.exe'
            - '*\cscript.exe'
        Image:
            - '*\powershell.exe'
    falsepositive:
        CurrentDirectory: '*\Health Service State\*'
    condition: selection and not falsepositive
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Microsoft Operations Manager (MOM)
    - Other scripts
level: medium