Suspicious Encoded Scripts in a WMI Consumer — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2021-09-01 / 2022-10-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1dc64f14fbb241771f0137acfe4c21cdbae3fd4204e1947720359a8bdc08fd04

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 Encoded Scripts in a WMI Consumer
id: 83844185-1c5b-45bc-bcf3-b5bf3084ca5b
status: test
description: Detects suspicious encoded payloads in WMI Event Consumers
references:
    - https://github.com/RiccardoAncarani/LiquidSnake
author: Florian Roth (Nextron Systems)
date: 2021-09-01
modified: 2022-10-09
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.t1047
    - attack.persistence
    - attack.t1546.003
logsource:
    product: windows
    category: wmi_event
detection:
    selection_destination:
        Destination|base64offset|contains:
            - 'WriteProcessMemory'
            - 'This program cannot be run in DOS mode'
            - 'This program must be run under Win32'
    condition: selection_destination
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/RiccardoAncarani/LiquidSnake