Suspicious Invoke-Obfuscation RUNDLL LAUNCHER - PowerShell (via ps_script)

title: Suspicious Invoke-Obfuscation RUNDLL LAUNCHER - PowerShell (via ps_script)
id: a08aacda-1dce-5827-bfa6-2d4244acef2d
status: stable
description: This rule detects Obfuscated Powershell via RUNDLL LAUNCHER
references:
    - https://attack.mitre.org/techniques/T1059/001/
    - https://attack.mitre.org/techniques/T1027/
    - https://github.com/SigmaHQ/sigma/issues/1009
author: Huntrule Team
date: 2026-02-25
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_4104:
        ScriptBlockText|contains|all:
            - 'rundll32.exe'
            - 'shell32.dll'
            - 'shellexec_rundll'
            - 'powershell'
    condition: selection_4104
falsepositives:
    - Unknown
level: medium