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Windows Defender Detects a Legitimate System File as a False Positive (Trojan:Win32/...)
I'm having an issue where Windows Defender keeps flagging a legitimate system file as a Trojan, specifically detecting it as Trojan:Win32 with a generic suffix. I'm certain this is a false positive because the file is a critical part of Windows and I haven't installed anything suspicious recently. Has anyone else experienced this with the latest Defender definition updates, and is there a safe way to restore or exclude this file without compromising system security? I'd appreciate any guidance on confirming whether it's truly a false alarm or if I should be concerned about a potential infection.
1 Reply
Hi, I would be careful before excluding it, even if it looks like a normal Windows file.
Good checks:
1. Confirm the exact file path. A real system file in the wrong folder can still be malware.
2. Check the file signature and publisher.
3. Run Windows Update and Defender intelligence updates.
4. Run an offline Microsoft Defender scan.
5. Submit the file to Microsoft Security Intelligence if you believe it is a false positive.
I would avoid adding a permanent exclusion until Microsoft confirms it or the detection clears after updated definitions. Exclusions can hide the problem if the file has actually been replaced or tampered with.
