Suspicious Processes Spawned by WinRM

Description

Detects suspicious processes including shells spawnd from WinRM host process

Query · sigma

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

Known false positives

  • Legitimate WinRM usage
Raw source Suspicious Processes Spawned by WinRM · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
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

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