This detection rule monitors unauthorized access to the 'protected_storage' service, which is associated with the Data Protection API (DPAPI) on Windows systems. The rule focuses on Event ID 5145 indicating access to shared IPC resources, particularly when the access involves the 'protected_storage' service. The main threat this rule aims to identify is the potential abuse of DPAPI, which could be exploited by attackers to extract domain backup keys from Domain Controllers. Such actions are usually indicative of lateral movement attempts in a networked environment, where an attacker seeks to escalate privileges or gain unauthorized access to sensitive data. By targeting this specific event and filtering for the 'IPC' share containing 'protected_storage', the rule effectively raises alerts for suspicious activities that could compromise domain-level access. Overall, this rule is crucial for maintaining the integrity of sensitive storage services within Windows environments, thereby mitigating risks associated with lateral movements and unauthorized access to confidential information.