SigmaHQ/rules/windows/sysmon/sysmon_mshta_spawn_shell.yml

title: MSHTA Spawning Windows Shell
status: experimental
description: Detects a Windows command line executable started from MSHTA.
reference: https://www.trustedsec.com/july-2015/malicious-htas/
author: Michael Haag
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 1
        ParentImage: '*\mshta.exe'
        Image:
            - '*\cmd.exe'
            - '*\powershell.exe'
            - '*\wscript.exe'
            - '*\cscript.exe'
            - '*\sh.exe'
            - '*\bash.exe'
            - '*\reg.exe'
            - '*\regsvr32.exe'
            - '*\BITSADMIN*'
    filter:
        Commandline:
            - '*/HP/HP*'
            - '*\HP\HP*'
    condition: selection and not filter
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Printer software / driver installations
level: high