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Backdoor.quasar false positive?


CliveStaples
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This morning, Mbam tells me that the scan it ran overnight found two files (a .zip and an EXE inside it) infected with Backdoor.Quasar.

It seems a little odd because the files have been on my PC since March (about 8 months) and no previous scan has detected any issue with them.  Nor I have recently extracted the .zip or run the contained EXE (modified date is about a year ago), so something else would have had to infect these already existing files, as opposed to downloading already-infected files - does that make sense?

Anyway, when I run a scan now, Mbam finds nothing, even if I specifically scan the .zip file.  (I haven't quarantined the files yet.)  Also, a McAfee scan shows no virus either.

I dunno how much it matters, but the files themselves are from a publisher I trust - proprietary files of my one of my clients.

I'm attaching a couple of files here, in case it's helpful.

  • Scan log.txt is the result of my current / clean Mbam scan, specifically targeting the .zip file.
  • Scan report.txt is a report from when the two files were detected overnight.

What (if anything) should I do?

Thanks!

 

scan log.txt scan report.txt

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