Remote DLL Load Via Rundll32.EXE — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-09-18 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 765008681fa2867aa72c04c9aaafd4a2a4bb21c0954985ddc02bd7a27d5ad654

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 DLL Load Via Rundll32.EXE
id: f40017b3-cb2e-4335-ab5d-3babf679c1de
status: test
description: Detects a remote DLL load event via "rundll32.exe".
references:
    - https://github.com/gabe-k/themebleed
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-09-18
tags:
    - attack.execution
    - attack.t1204.002
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith: '\rundll32.exe'
        ImageLoaded|startswith: '\\\\'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/gabe-k/themebleed
• Internal Research (source note; no public URL supplied)