A Problem with an MBAM update

[paranoidsoul]

Since last week my friend and I have been puzzled about trojan that malwarebytes has found on his pc. The file that was supposedly infected is is-QMU93.exe found in the windows folder. It was there for a couple of months and after various meddling about we found that that file is a file that would normally come up when he updated malwarebytes from one version to another from the update button. So in essence the infected file is an actual malwarebytes update. The trojan found was Trojan.Banker now this file has been on his machine for months yet it only appeared as a threat after he scanned last week after he had updated his database????

Honestly I have no clue how these malwares work for the file says it was created in April or May and as far as we could tell it was not modified based on the modified date. So we are wondering if this actual update file was a trojan or perhaps it was infected much later. We cannot tell because we do not know if when a malware infects a file if the modification date will change as well. Also based on the timeframe we think perhaps this came about when he upgraded to either version 1.36 or 1.37. I really don't know as I do not know how often my friend updates.

[AdvancedSetup]

You can upload the file to http://www.virustotal.com and they will scan it and let you know what they find with it. It's also probably best that he follow the directions below and we can help him determine if he is infected or not.

Scan and post logs - read note at bottom in green

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[paranoidsoul]

I'll tell him to join the forum and point him to this thread since that would make things easier.