This detection rule identifies potentially suspicious changes to the desktop background by monitoring specific Windows registry keys associated with desktop customization. Malware often employs such techniques to alter the desktop environment, frequently replacing it with ransom notes or other malicious imagery. The rule focuses on changes to keys related to the Control Panel settings for Desktop, as well as specific policies that control wallpaper behavior. By observing alterations that may signal such malicious activity, security teams can take proactive measures to investigate and respond to potential malware infections. The detection conditions specify that any changes to certain registry objects must be evaluated, specifically looking for flags that indicate a restriction on changing the wallpaper, or modification of the wallpaper settings to predetermined malicious values. The rule aims to minimize false positives by filtering out legitimate administrative scripts that might adjust backgrounds as part of corporate policies. Given that attackers typically manipulate these settings to create an impactful display during their operations, timely detection is crucial in thwarting business interruptions caused by ransomware and similar threats.