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Detection rules › Sigma

Winlogon Notify Key Logon Persistence

Status
test
Severity
high
Log source
product windows, category registry_set
Author
frack113
Source
github.com/SigmaHQ/sigma

Adversaries may abuse features of Winlogon to execute DLLs and/or executables when a user logs in. Winlogon.exe is a Windows component responsible for actions at logon/logoff as well as the secure attention sequence (SAS) triggered by Ctrl-Alt-Delete.

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1547.004 Boot or Logon Autostart Execution: Winlogon Helper DLL
Privilege EscalationT1547.004 Boot or Logon Autostart Execution: Winlogon Helper DLL

Event coverage

ProviderEventTitle
SysmonEvent ID 13RegistryEvent (Value Set)

Rule body yaml

title: Winlogon Notify Key Logon Persistence
id: bbf59793-6efb-4fa1-95ca-a7d288e52c88
status: test
description: |
    Adversaries may abuse features of Winlogon to execute DLLs and/or executables when a user logs in.
    Winlogon.exe is a Windows component responsible for actions at logon/logoff as well as the secure attention sequence (SAS) triggered by Ctrl-Alt-Delete.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.004/T1547.004.md#atomic-test-3---winlogon-notify-key-logon-persistence---powershell
author: frack113
date: 2021-12-30
modified: 2023-08-17
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1547.004
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|endswith: '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\logon'
        Details|endswith: '.dll'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetObject|endswith: '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\logon'
    Details|endswith: '.dll'

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
Detailsends_with
  • .dll corpus 8 (sigma 4, elastic 3, splunk 1)
TargetObjectends_with
  • \SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\logon