Possible Obfuscated Ordinal Call Through Rundll32 (via process_creation)

title: Possible Obfuscated Ordinal Call Through Rundll32 (via process_creation)
id: 867d93a4-d14a-5333-9868-70702aead59e
status: stable
description: This rule detects execution of "rundll32" with potential obfuscated ordinal calls
references:
    - https://attack.mitre.org/techniques/T1027/010/
    - Internal Research
    - https://www.youtube.com/watch?v=52tAmVLg1KM&t=2070s
author: Huntrule Team
date: 2026-01-02
tags:
    - attack.stealth
    - attack.t1027.010
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\rundll32.exe'
        - OriginalFileName: 'RUNDLL32.EXE'
        - CommandLine|contains: 'rundll32'
    selection_cli:
        CommandLine|contains:
            - '#+'
            - '#-'
            - '#0'
            - '#655'
            - '#656'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium