The detection rule 'Windows Modify Registry NoChangingWallPaper' is designed to identify changes made to the Windows registry which prevent users from altering their wallpaper. This rule utilizes data from Sysmon events, specifically EventID 12 and EventID 13, to monitor registry modifications aimed at setting the 'NoChangingWallPaper' value to 1. The significance of this particular registry change lies in its association with the Rhysida ransomware, which employs this tactic to enforce a malicious wallpaper, thus restricting user control over desktop settings. This rule captures activities that may indicate a ransomware infection, prompting further investigation of potential system compromise and user disruption. By utilizing the Endpoint.Registry data model, this detection efficiently aggregates relevant events, aiding security teams in identifying and mitigating potential threats.