Invoke-Obfuscation RUNDLL LAUNCHER - Security — Sigma Rule

Rule metadata and linked tags

Author: Timur Zinniatullin, oscd.community. Source status: test; severity: medium. Source dates: 2020-10-18 / 2022-11-29.

{
  "product": "windows",
  "service": "security",
  "definition": "The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 07d06071a0ffdc00f8e29ff46ca797c5fea4d8a18d27c0c6d460bbb83f47f4c3

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: Invoke-Obfuscation RUNDLL LAUNCHER - Security
id: f241cf1b-3a6b-4e1a-b4f9-133c00dd95ca
related:
    - id: 11b52f18-aaec-4d60-9143-5dd8cc4706b9
      type: derived
status: test
description: Detects Obfuscated Powershell via RUNDLL LAUNCHER
references:
    - https://github.com/SigmaHQ/sigma/issues/1009 # (Task 23)
author: Timur Zinniatullin, oscd.community
date: 2020-10-18
modified: 2022-11-29
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    service: security
    definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
detection:
    selection:
        EventID: 4697
        ServiceFileName|contains|all:
            - 'rundll32.exe'
            - 'shell32.dll'
            - 'shellexec_rundll'
            - 'powershell'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/SigmaHQ/sigma/issues/1009