Microsoft security scanner saying that 19+ files infected but it says that there's no malware.

Question

Hi

Keep in mind that I know someone has already answered this question in another forum but not satisfied with the answer.

I recently got infected with a nasty piece of malware 2 months ago and I believe it’s a firmware virus although I’m starting to think it’s a boot sector virus since they’re quite rare. I did format and reinstall my OS via a usb stick just to let you know.

I noticed many AV programs either don’t detect anything or detect something and say everything is fine. I’m highly confident I have a virus because of the weird symptoms and my questionable download. I tried out many AV tools and the best tool that seems the most promising is the Microsoft security scanner. The scanner says that I have no malware although it detected 19+ infected files. Malwarebytes anti-rootkit tool also says that it detected infected files as well although it can’t managed since there’s no backup file. What should I do to fix or troubleshoot Microsoft security scanner or Malwarebytes anti-rootkit.

Answer 1

You mentioned about downloading a suspicious file, in case you have a sample of it submit it to:
https://www.microsoft.com/en-us/wdsi/filesubmission
Safety Scanner has algorithm to detect some files based on behaviors and that is where you saw 19+ files and mark them as suspicious and during the scan, it will perform actual test and determine they are false-positive and not a real malware. In regard to the Malwarebytes, you have to check with them (since it is not a Microsoft product.
You may try performing scan with Microsoft Defender Offline, have a look at:
https://support.microsoft.com/en-us/windows/help-protect-my-pc-with-microsoft-defender-offline-9306d528-64bf-4668-5b80-ff533f183d6c

Answer 2

I guess you only have infected component, but the file is large and even if you download them, you won't be able to submit the whole file.
I advise you to submit the URL of the torrent download or the URL to the website where you download it, you may submit it on the following website:
https://www.microsoft.com/en-us/wdsi/support/report-unsafe-site