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Hidden Forensic Evidence in Windows ETL: Diagtrack File

🔍 FortiGuard IR analysts discovered that an obscure ETL file, AutoLogger-Diagtrack-Listener.etl, can retain historical process execution data useful for post-incident forensics. Parsing ETW payloads exposed ProcessStarted events including ImageName, ProcessID, ParentProcessID and sometimes CommandLine entries that revealed deleted tools. Controlled testing showed creating the autologger and setting AllowTelemetry=3 often produced an empty file, indicating the DiagTrack service may populate the file only under undocumented conditions. Further research is needed to understand when and how this telemetry is written.