Suspicious Processes Spawned by WinRM — Sigma Rule

Rule metadata and linked tags

Author: Andreas Hunkeler (@Karneades), Markus Neis. Source status: test; severity: high. Source dates: 2021-05-20 / 2022-07-14.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 040d27e1c154cd67e43b8eef2a1d604f56e36cd84cf84b762ca1374e016bcbff

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: Suspicious Processes Spawned by WinRM
id: 5cc2cda8-f261-4d88-a2de-e9e193c86716
status: test
description: Detects suspicious processes including shells spawnd from WinRM host process
author: Andreas Hunkeler (@Karneades), Markus Neis
references:
    - Internal Research
date: 2021-05-20
modified: 2022-07-14
tags:
    - attack.t1190
    - attack.initial-access
    - attack.persistence
    - attack.privilege-escalation
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\wsmprovhost.exe'
        Image|endswith:
            - '\cmd.exe'
            - '\sh.exe'
            - '\bash.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\wsl.exe'
            - '\schtasks.exe'
            - '\certutil.exe'
            - '\whoami.exe'
            - '\bitsadmin.exe'
    condition: selection
falsepositives:
    - Legitimate WinRM usage
level: high

Original YAML and metadata in JSON

False positives

• Legitimate WinRM usage

Source references

• Internal Research (source note; no public URL supplied)