Help with Trojan:O97M/Mountsi.C!ml

This morning when I turned on my laptop I saw a red cross check mark on Windows Security icon. I clicked on it and under "Virus & threat protection" there was "threats found". I clicked on "Start actions" button but nothing seems to happen and then the whole Windows Security window closes. I open it again and I see a green tick and then changes automatically back to a red cross check.

I click on "See threat details" and it says "No recent actions", and the Windows Security screen hangs and it shuts off itself.

I open Windows Security again and click "See threat details" and I can see the details and then it closes itself automatically.

And there is a high CPU usage by "Antimalware Service Executable" in the task manager, I restarted my laptop several times and still the same.

Here are some screenshots with more information.

Try a scan with a different AV (Malwarebytes free edition, ESET online scanner or one of your choosing)

Let us know the results.

And there is a high CPU usage by "Antimalware Service Executable" in the task manager

Perhaps it is working to try and get rid of whatever it doesnt like.

there are bootable av things available free from many 3rd party av programs.

How to Run a Microsoft Defender Offline Scan in Windows 10 can try boot time scan with Windows Defender too. Maybe time to do this now.

Option 1, 2, or 3 will all yield the same result

pericles said:

Try a scan with a different AV (Malwarebytes free edition, ESET online scanner or one of your choosing)


Let us know the results.

I tried many software, Kaspersky TDSS killer, Malwarebytes, Trojan Killer, GridinSoft Anti-Malware, Spybot, Clamwin, HitmanPro, and non of them found any threats.
I ended up formatting my laptop and installed a fresh Windows 11 Pro.

Thanks.

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Paul Black said:

Hello @iMak,

I would certainly try scanning your OS Offline. Microsoft Defender has come a long way in the last few years and is pretty good now . . .

> How to Run a Microsoft Defender Offline Scan in Windows 10 - Option 2.

I would also run a separate AV scan using your installed AV if you have one.

Also, have a look at this => 18 Best Free On-Demand Virus Scanners

I hope this helps.

I wish I knew this earlier but after I tried many 3rd party softwares which non of them detected the threat, I ended up formatting and installing a fresh Windows 11 Pro. Thanks.