Potential PSFactoryBuffer COM Hijacking
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About the rule
Rule Type
Standard
Rule Description
Detects changes to the PSFactory COM InProcServer32 registry. This technique was used by RomCom to create persistence storing a malicious DLL.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND (OBJECTNAME endswith "\CLSID\{c90250f3-4d7d-4991-9b69-a5c5bc1c2ae6}\InProcServer32\(Default)" OR (OBJECTNAME endswith "\CLSID\{c90250f3-4d7d-4991-9b69-a5c5bc1c2ae6}\InProcServer32" AND OBJECTVALUENAME = "(Default)")) AND INFORMATION != "%windir%\System32\ActXPrxy.dll,C:\Windows\System32\ActXPrxy.dll" select Action1.HOSTNAME,Action1.MESSAGE,Action1.OBJECTNAME,Action1.PROCESSNAME,Action1.PREVVAL,Action1.CHANGES
Detection
Execution Mode
realtime
Log Sources
Windows
Author
BlackBerry Threat Research and Intelligence Team - @Joseliyo_Jstnk
