The rule "Prefetch File Deleted" is designed to detect the deletion of Windows prefetch files, specifically files found in the `\Windows\Prefetch\` directory with the `.pf` extension. These files are created by the Windows operating system to speed up application launch times by caching the necessary data. The deletion of these prefetch files can indicate an attempt to erase traces of executed programs, potentially as an evasion tactic employed by malicious actors to destroy forensic evidence. The rule focuses on activations occurring outside of the legitimate `svchost.exe` process user contexts, specifically excluding certain users identified by the substring 'AUTHORI' or 'AUTORI'. It employs a high severity level, highlighting the critical nature of file deletion within forensic contexts. The rule is pertinent for Windows environments and is crucial for detecting suspicious behavior that might otherwise go unnoticed, aiding in the identification of potential security incidents.