win_security_invoke_obfuscation_stdin_services_security.yml

title: Invoke-Obfuscation STDIN+ Launcher - Security
id: 0c718a5e-4284-4fb9-b4d9-b9a50b3a1974
related:
    - id: 72862bf2-0eb1-11eb-adc1-0242ac120002
      type: derived
status: test
description: Detects Obfuscated use of stdin to execute PowerShell
references:
    - https://github.com/SigmaHQ/sigma/issues/1009  # (Task 25)
author: Jonathan Cheong, oscd.community
date: 2020/10/15
modified: 2022/11/29
tags:
    - attack.defense_evasion
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    service: security
    definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
detection:
    selection:
        EventID: 4697
        ServiceFileName|contains|all:
            - 'cmd'
            - 'powershell'
    selection2:
        ServiceFileName|contains:
            - '${input}'
            - 'noexit'
    selection3:
        ServiceFileName|contains:
            - ' /c '
            - ' /r '
    condition: all of selection*
falsepositives:
    - Unknown
level: high