Potential Ransomware Activity Using LegalNotice Message
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About the rule
Rule Type
Standard
Rule Description
Detect changes to the "LegalNoticeCaption" or "LegalNoticeText" registry values where the message set contains keywords often used in ransomware ransom messages
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND (OBJECTNAME contains "\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LegalNoticeCaption,\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LegalNoticeText" OR ((OBJECTNAME endswith "\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" AND OBJECTVALUENAME startswith "LegalNoticeCaption") OR (OBJECTNAME endswith "\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" AND OBJECTVALUENAME startswith "LegalNoticeText"))) AND INFORMATION contains "encrypted,Unlock-Password,paying" select Action1.HOSTNAME,Action1.MESSAGE,Action1.OBJECTNAME,Action1.PROCESSNAME,Action1.PREVVAL,Action1.CHANGES
Detection
Execution Mode
realtime
Log Sources
Windows
Author
frack113
