The detection rule identifies unauthorized or suspicious AppX package installation attempts on Windows systems by monitoring deployment events specifically for error code "0x80073cff". This error suggests that the AppX package does not comply with the signing requirements necessary for trustworthy installation. This can occur in scenarios where attackers attempt to leverage malicious AppX packages to execute malware or exploit system vulnerabilities. The detection is based on monitoring the Windows AppX deployment service, focusing specifically on EventID 401, when the specified error code appears. Given the rule's configuration, it accurately highlights potential security risks while also accounting for legitimate situations, such as in enterprise environments where AppX packages might not meet default signing standards but are still trustworthy. Thus, identifying false positives, such as these legitimate packages, is vital for maintaining operational consistency while ensuring security vigilance.