SigmaHQ/rules/windows/sysmon/sysmon_stickykey_like_backdoor.yml

title: Sticky Key Like Backdoor Usage
description: Detects the usage and installation of a backdoor that uses an option to register a malicious debugger for built-in tools that are accessible in the login screen
references:
    - https://blogs.technet.microsoft.com/jonathantrull/2016/10/03/detecting-sticky-key-backdoors/
author: Florian Roth, @twjackomo
date: 2018/03/15
logsource:
    product: windows
    service: sysmon
detection:
    selection_process:
        EventID: 1
        ParentImage:
            - '*\winlogon.exe'
        CommandLine:
            - '*\cmd.exe sethc.exe *'
            - '*\cmd.exe utilman.exe *'
            - '*\cmd.exe osk.exe *'
            - '*\cmd.exe Magnify.exe *'
            - '*\cmd.exe Narrator.exe *'
            - '*\cmd.exe DisplaySwitch.exe *'
    selection_registry:
        EventID: 13
        TargetObject: 
            - '*\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\sethc.exe\Debugger'
            - '*\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\utilman.exe\Debugger'
            - '*\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\osk.exe\Debugger'
            - '*\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Magnify.exe\Debugger'
            - '*\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Narrator.exe\Debugger'
            - '*\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\DisplaySwitch.exe\Debugger'
        EventType: 'SetValue'
    condition: 1 of them
falsepositives:
    - Unlikely
level: critical