Winlogon Helper DLL
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. Registry entries in HKLM\Software[Wow6432Node]Microsoft\Windows NT\CurrentVersion\Winlogon\ and HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\ are used to manage additional helper programs and functionalities that support Winlogon. Malicious modifications to these Registry keys may cause Winlogon to load and execute malicious DLLs and/or executables.
Convert In Phoenix Studio
Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.
Definition
Requirements: Script Block Logging must be enabled
detection:
selection:
ScriptBlockText|contains: 'CurrentVersion\Winlogon'
selection2:
ScriptBlockText|contains:
- 'Set-ItemProperty'
- 'New-Item'
condition: all of selection*False positive likelihood has not been assessed. Additional context may be needed during triage.
Sub-techniques