Remote Code Execute via Winrm.vbs — Sigma Rule

Rule metadata and linked tags

Author: Julia Fomina, oscd.community. Source status: test; severity: medium. Source dates: 2020-10-07 / 2023-03-03.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: effd161b9667488a1578fb5c305ced25c319fc2a258d013908f96bd7c8462319

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 Code Execute via Winrm.vbs
id: 9df0dd3a-1a5c-47e3-a2bc-30ed177646a0
status: test
description: Detects an attempt to execute code or create service on remote host via winrm.vbs.
references:
    - https://twitter.com/bohops/status/994405551751815170
    - https://redcanary.com/blog/lateral-movement-winrm-wmi/
    - https://lolbas-project.github.io/lolbas/Scripts/Winrm/
author: Julia Fomina, oscd.community
date: 2020-10-07
modified: 2023-03-03
tags:
    - attack.stealth
    - attack.t1216
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        # Note: winrm.vbs can only be run by a process named cscript (see "IsCScriptEnv" function)
        - Image|endswith: '\cscript.exe'
        - OriginalFileName: 'cscript.exe'
    selection_cli:
        CommandLine|contains|all:
            - 'winrm'
            - 'invoke Create wmicimv2/Win32_'
            - '-r:http'
    condition: all of selection*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/bohops/status/994405551751815170
• https://redcanary.com/blog/lateral-movement-winrm-wmi/
• https://lolbas-project.github.io/lolbas/Scripts/Winrm/