This rule is designed to detect unauthorized modifications to the Disk Cleanup Handler settings within the Windows registry, which may indicate an attacker attempting to establish persistence on a compromised system. The Disk Cleanup Manager in Windows allows users to manage various cleanup utilities, and it can be extended by developers to include additional disk cleanup handlers. By monitoring the registry entries corresponding to the cleanup handlers, this rule can identify when a new entry is created that does not conform to predefined, legitimate entries. Since these modified handlers could be leveraged by an attacker to control system cleanup processes and avoid detection, the rule selects events where new registry keys are created in the specific location corresponding to Disk Cleanup handlers, while filtering out legitimate entries that are commonly present.