Detection rules › Sigma
Sticky Key Like Backdoor Usage - Registry
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
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1546.008 Event Triggered Execution: Accessibility Features |
| Privilege Escalation | T1546.008 Event Triggered Execution: Accessibility Features |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 12 | RegistryEvent (Object create and delete) |
| Sysmon | Event ID 13 | RegistryEvent (Value Set) |
| Sysmon | Event ID 14 | RegistryEvent (Key and Value Rename) |
Rule body yaml
title: Sticky Key Like Backdoor Usage - Registry
id: baca5663-583c-45f9-b5dc-ea96a22ce542
status: test
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/
- https://bazaar.abuse.ch/sample/6f3aa9362d72e806490a8abce245331030d1ab5ac77e400dd475748236a6cc81/
author: Florian Roth (Nextron Systems), @twjackomo, Jonhnathan Ribeiro, oscd.community
date: 2018-03-15
modified: 2022-11-26
tags:
- attack.privilege-escalation
- attack.persistence
- attack.t1546.008
- car.2014-11-003
- car.2014-11-008
logsource:
category: registry_event
product: windows
detection:
selection_registry:
TargetObject|endswith:
- '\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'
- '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\atbroker.exe\Debugger'
- '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\HelpPane.exe\Debugger'
condition: selection_registry
falsepositives:
- Unlikely
level: critical
Stages and Predicates
Stage 0: condition
selection_registryStage 1: selection_registry
selection_registry:
TargetObject|endswith:
- '\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'
- '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\atbroker.exe\Debugger'
- '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\HelpPane.exe\Debugger'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
TargetObject | ends_with |
|