Suspicious Debugger Registration Cmdline — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), oscd.community, Jonhnathan Ribeiro. Source status: test; severity: high. Source dates: 2019-09-06 / 2022-08-06.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6c1240a58c84a22f399f2568a448d37489598c14c888aac6e3770c39f0d64b91

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: Suspicious Debugger Registration Cmdline
id: ae215552-081e-44c7-805f-be16f975c8a2
status: test
description: Detects the registration of a debugger for a program that is available in the logon screen (sticky key backdoor).
references:
    - https://blogs.technet.microsoft.com/jonathantrull/2016/10/03/detecting-sticky-key-backdoors/
    - https://bazaar.abuse.ch/sample/6f3aa9362d72e806490a8abce245331030d1ab5ac77e400dd475748236a6cc81/
author: Florian Roth (Nextron Systems), oscd.community, Jonhnathan Ribeiro
date: 2019-09-06
modified: 2022-08-06
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1546.008
logsource:
    category: process_creation
    product: windows
detection:
    selection1:
        CommandLine|contains: '\CurrentVersion\Image File Execution Options\'
    selection2:
        CommandLine|contains:
            - 'sethc.exe'
            - 'utilman.exe'
            - 'osk.exe'
            - 'magnify.exe'
            - 'narrator.exe'
            - 'displayswitch.exe'
            - 'atbroker.exe'
            - 'HelpPane.exe'
    condition: all of selection*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://blogs.technet.microsoft.com/jonathantrull/2016/10/03/detecting-sticky-key-backdoors/
• https://bazaar.abuse.ch/sample/6f3aa9362d72e806490a8abce245331030d1ab5ac77e400dd475748236a6cc81/