This is normal behavior by Microsoft Animalware software but not very well documented by the Microsoft Security Team.
If Microsoft Defender indicates no detections found at the end of it's scan and there are no items listed in quarantined upon completion, that typically means Defender completed it's scan and determined all scanned files were not malware related. If is not unusual for Defender (or any other security software) to suspect and warn about possible threats during a scan (a preliminary status indication) but later determine the file(s) were not an actual confirmed threat(s) upon completion.
I explain in more detail in Microsoft Security products indicates detected files during scan but does not show anything after completion (Post #22).
Potential problem when scanning a crashed computer
When scanning a crashed computer, I saw over 6 million files scanned and while scanning it was reporting over 60 infected files. When it finally finished, the scan results say no viruses or spyware were detected. Is this normal?
Windows for home | Windows 10 | Security and privacy
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Ivan B 125.3K Reputation points Independent Advisor
2025-06-03T01:11:11+00:00 Hi ,
I am Ivan, I will help you with this.
Did you do this scan using Windows Defender or a third-party antivirus?
Independent Advisor - Community
Thanks