SigmaHQ/rules/windows/sysmon/sysmon_alternate_powershell_hosts_pipe.yml

title: Alternate PowerShell Hosts Pipe
id: 58cb02d5-78ce-4692-b3e1-dce850aae41a
description: Detects alternate PowerShell hosts potentially bypassing detections looking for powershell.exe
status: experimental
date: 2019/09/12
modified: 2019/11/10
author: Roberto Rodriguez @Cyb3rWard0g
references:
    - https://github.com/Cyb3rWard0g/ThreatHunter-Playbook/tree/master/playbooks/windows/02_execution/T1086_powershell/alternate_signed_powershell_hosts.md
tags:
    - attack.execution
    - attack.t1086          # an old one
    - attack.t1059.001
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 17
        PipeName|startswith: '\PSHost'
    filter:
        Image|endswith:
            - '\powershell.exe'
            - '\powershell_ise.exe'
    condition: selection and not filter
fields:
    - ComputerName
    - User
    - Image
    - PipeName
falsepositives:
    - Programs using PowerShell directly without invocation of a dedicated interpreter.
level: medium