Rundll32 Registered COM Objects — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2022-02-13 / 2023-02-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 79b2c49c08ebced8e88ebc1b6267c0f348f1120579edce54ec5b067e95073228

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: Rundll32 Registered COM Objects
id: f1edd233-30b5-4823-9e6a-c4171b24d316
status: test
description: load malicious registered COM objects
references:
    - https://nasbench.medium.com/a-deep-dive-into-rundll32-exe-642344b41e90
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.015/T1546.015.md
author: frack113
date: 2022-02-13
modified: 2023-02-09
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1546.015
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\rundll32.exe'
        - OriginalFileName: 'RUNDLL32.EXE'
    selection_cli:
        CommandLine|contains:
            - '-sta '
            - '-localserver '
        CommandLine|contains|all:
            - '{'
            - '}'
    condition: all of selection_*
falsepositives:
    - Legitimate use
level: high

Original YAML and metadata in JSON

False positives

• Legitimate use

Source references

• https://nasbench.medium.com/a-deep-dive-into-rundll32-exe-642344b41e90
• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.015/T1546.015.md