Windows 10: Windows 10 Defender still reports threat after allegedly removing it

Hi everybody!I'm still working in Windows 10 - not 11.Windows Defender has found a Trojan on a backup CD-R that is over 15 years old. The file in question was not executed, so apparently the Trojan of medium severity was not activated.I performed a full system scan, but there was no threat found. Still Windows Defender displays the threat found a few days ago as "active", showing the little red mark on its icon. Whenever I scan the system, there are "0 threats found".Why does the Defender icon mark not turn green again? Why is that "old" threat still being displayed?I've already tried to cle

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WINDOWS DEFENDER IS NOT REMOVING THREATS

I'm having a problem with Windows Defender the threats found after I ran a full scan that last maybe around 10 hours cannot be removed by windows defender. I selected the remove option and it shows processing but after a while
the threats are still listed and active. I already ran a offline scan and a quick scan but neither fix the problem.

I already ran a secure boot and see if third-party apps are causing the problem but nothing works the threats are still listed and active. I checked the location of the file and manually deleted it even on my recycle bin but
the threats are still there and labeled as active. This very annoying. I think this is an error in the windows defender part because I installed Malwarebytes and ran a full scan which took a couple of hours and found nothing because like I've said I have deleted
the file location where the threats are.

 

WINDOWS DEFENDER IS NOT REMOVING THREATS

Hello Paul,

Thanks for providing the link and trying to help me but it doesn't do the job. I ran the safety scanner for a full scan and it took almost 10 hours and didn't find any threats, but the list on windows defender about threats is still there and it shows active.
I don't know if that's a bug or what I'm done doing a clean boot and restart my computer after the safety scanner finished scanning but the threats are still listed there. Very annoying.

I'm thinking of removing it manually but I don't know-how. I tried to remove it by cleaning the log files where it stores the protection history but I think the listed threats were stored in another location.

 

Windows defender false positive - forced to allow threat

Windows defender has started to identify C:\Windows\System32\mshta.exe as a threat [normally reported as a Trojan Powessere.G]. I use mshta.exe to run an hta custom MsgBox - I have been hoping to keep using my current CustomMsgBox tool [batch file calling a vbs-hta file] until later this year when I hope to have had enough time to replace it with a PowerShell alternative.

Windows defender's notification lets me "allow the threat" but that seems to me to be a bigger security hole than is necessary - it will now ignore a potentially real intrusion when all I want to run is a genuine Windows component. My immediate problem is fixed but I would prefer to fix the false positive using the exclusions list.

I cleared the 'Allowed threats history' so I could use the exclusions list instead. I added C:\Windows\System32\mshta.exe to the file exclusions list and I checked that it had taken properly by checking the exclusions list both in the UI & in the Registry. But the exclusion made no difference, it continued to detect and block the exe.

I have repeated the attempt several times [by clearing the allowed threats list & exclusions list beforehand] and the results are the same every time
- allowing the threat works,
- using the exclusions list has no effect.

I studied the relevant tutorial but have not spotted an error in what I have been doing - Add or Remove Windows Defender Exclusions

Does anybody with experience of using the exclusions list to counter false positives have any suggestions for me?

Denis