Potentially Suspicious Desktop Background Change Using Reg.EXE
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About the rule
Rule Type
Standard
Rule Description
Detects the execution of "reg.exe" to alter registry keys that would replace the user's desktop background. This is a common technique used by malware to change the desktop background to a ransom note or other image.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND ((PROCESSNAME endswith "\reg.exe" OR ORIGINALFILENAME = "reg.exe") AND COMMANDLINE contains "add") AND COMMANDLINE contains "Control Panel\Desktop,CurrentVersion\Policies\ActiveDesktop,CurrentVersion\Policies\System" AND ((COMMANDLINE contains "/v NoChangingWallpaper" AND COMMANDLINE contains "/d 1") OR (COMMANDLINE contains "/v Wallpaper" AND COMMANDLINE contains "/t REG_SZ") OR (COMMANDLINE contains "/v WallpaperStyle" AND COMMANDLINE contains "/d 2")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Stephen Lincoln @slincoln-aiq (AttackIQ)
