Potentially Suspicious Desktop Background Change Via Registry
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About the rule
Rule Type
Standard
Rule Description
Detects registry value settings 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 = "Registry value modified" AND (OBJECTNAME contains "Control Panel\Desktop,CurrentVersion\Policies\ActiveDesktop,CurrentVersion\Policies\System" OR (OBJECTNAME endswith "Control Panel" AND OBJECTVALUENAME startswith "Desktop")) AND (((OBJECTNAME endswith "NoChangingWallpaper" OR OBJECTVALUENAME endswith "NoChangingWallpaper") AND (INFORMATION = "DWORD (0x00000001)" OR (CHANGES = 1 AND NEWTYPE = "REG_DWORD"))) OR (OBJECTNAME endswith "\Wallpaper" OR (isExist(OBJECTNAME) AND OBJECTVALUENAME = "Wallpaper")) OR ((OBJECTNAME endswith "\WallpaperStyle" OR (isExist(OBJECTNAME) AND OBJECTVALUENAME = "WallpaperStyle")) AND INFORMATION = "2")) AND PROCESSNAME notendswith "\svchost.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), Stephen Lincoln @slincoln-aiq (AttackIQ)
