Suspicious Shim Database Patching Activity
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About the rule
Rule Type
Standard
Rule Description
Detects installation of new shim databases that try to patch sections of known processes for potential process injection or persistence.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND (OBJECTNAME contains "\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Custom" OR (OBJECTNAME endswith "\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Custom" AND isExist(OBJECTVALUENAME))) AND OBJECTNAME endswith "\csrss.exe,\dllhost.exe,\explorer.exe,\RuntimeBroker.exe,\services.exe,\sihost.exe,\svchost.exe,\taskhostw.exe,\winlogon.exe,\WmiPrvSe.exe" 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)
