Remote PowerShell Session Host Process (WinRM) — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez @Cyb3rWard0g. Source status: test; severity: medium. Source dates: 2019-09-12 / 2022-10-09.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 49a0c70167c392946442d085c6fa4fe90aec4ae8592dfc56453dcfc33b8c065e

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Remote PowerShell Session Host Process (WinRM)
id: 734f8d9b-42b8-41b2-bcf5-abaf49d5a3c8
status: test
description: Detects remote PowerShell sections by monitoring for wsmprovhost (WinRM host process) as a parent or child process (sign of an active PowerShell remote session).
references:
    - https://threathunterplaybook.com/hunts/windows/190511-RemotePwshExecution/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-09-12
modified: 2022-10-09
tags:
    - attack.execution
    - attack.lateral-movement
    - attack.t1059.001
    - attack.t1021.006
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\wsmprovhost.exe'
        - ParentImage|endswith: '\wsmprovhost.exe'
    condition: selection
falsepositives:
    - Legitimate usage of remote Powershell, e.g. for monitoring purposes.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of remote Powershell, e.g. for monitoring purposes.

Source references

• https://threathunterplaybook.com/hunts/windows/190511-RemotePwshExecution/notebook.html