New Process Created Via Taskmgr.EXE — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: low. Source dates: 2018-03-13 / 2024-01-18.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 52de85cb84f8a86a3183a4d919ea25d864bcd61c3303f5bc19bc97dcff755e13

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: New Process Created Via Taskmgr.EXE
id: 3d7679bd-0c00-440c-97b0-3f204273e6c7
status: test
description: Detects the creation of a process via the Windows task manager. This might be an attempt to bypass UAC
references:
    - https://twitter.com/ReneFreingruber/status/1172244989335810049
author: Florian Roth (Nextron Systems)
date: 2018-03-13
modified: 2024-01-18
tags:
    - attack.stealth
    - attack.t1036
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\taskmgr.exe'
    filter_main_generic:
        Image|endswith:
            - ':\Windows\System32\mmc.exe'
            - ':\Windows\System32\resmon.exe'
            - ':\Windows\System32\Taskmgr.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Administrative activity
level: low

Original YAML and metadata in JSON

False positives

• Administrative activity

Source references

• https://twitter.com/ReneFreingruber/status/1172244989335810049