Potential Persistence Via LSA Extensions
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About the rule
Rule Type
Standard
Rule Description
Detects when an attacker modifies the "REG_MULTI_SZ" value named "Extensions" to include a custom DLL to achieve persistence via lsass. The "Extensions" list contains filenames of DLLs being automatically loaded by lsass.exe. Each DLL has its InitializeLsaExtension() method called after loading.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND OBJECTNAME contains "\SYSTEM\CurrentControlSet\Control\LsaExtensionConfig\LsaSrv\Extensions" OR (OBJECTNAME endswith "\SYSTEM\CurrentControlSet\Control\LsaExtensionConfig\LsaSrv" AND OBJECTVALUENAME startswith "Extensions") select Action1.HOSTNAME,Action1.MESSAGE,Action1.OBJECTNAME,Action1.PROCESSNAME,Action1.PREVVAL,Action1.CHANGES
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
