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Detection rules › Sigma

Persistence Via Sticky Key Backdoor

Status
test
Severity
critical
Log source
product windows, category process_creation
Author
Sreeman
Source
github.com/SigmaHQ/sigma

By replacing the sticky keys executable with the local admins CMD executable, an attacker is able to access a privileged windows console session without authenticating to the system. When the sticky keys are "activated" the privilleged shell is launched.

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1546.008 Event Triggered Execution: Accessibility Features
Privilege EscalationT1546.008 Event Triggered Execution: Accessibility Features

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: Persistence Via Sticky Key Backdoor
id: 1070db9a-3e5d-412e-8e7b-7183b616e1b3
status: test
description: |
    By replacing the sticky keys executable with the local admins CMD executable, an attacker is able to access a privileged windows console session without authenticating to the system.
    When the sticky keys are "activated" the privilleged shell is launched.
references:
    - https://www.fireeye.com/blog/threat-research/2017/03/apt29_domain_frontin.html
    - https://www.clearskysec.com/wp-content/uploads/2020/02/ClearSky-Fox-Kitten-Campaign-v1.pdf
    - https://learn.microsoft.com/en-us/archive/blogs/jonathantrull/detecting-sticky-key-backdoors
author: Sreeman
date: 2020-02-18
modified: 2023-03-07
tags:
    - attack.persistence
    - attack.t1546.008
    - attack.privilege-escalation
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        CommandLine|contains|all:
            - 'copy '
            - '/y '
            - 'C:\windows\system32\cmd.exe C:\windows\system32\sethc.exe'
    condition: selection
falsepositives:
    - Unlikely
level: critical

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains|all:
        - 'copy '
        - '/y '
        - 'C:\windows\system32\cmd.exe C:\windows\system32\sethc.exe'

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.

FieldKindValues
CommandLinematch
  • /y
  • C:\windows\system32\cmd.exe C:\windows\system32\sethc.exe
  • copy corpus 12 (sigma 11, chronicle 1)