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Trojan:BAT/Simda.A


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I have a friends computer that is running Windows 8.1.  I just did a FULL scan with Windows Defender. It found the trojan I listed in the title. At the end of the scan, there is a button to push that says CLEAN PC.  Well I click that. The scroll bar gets about 75% across and then stops. I have waited for an hour, and it never completes. At this point, I need to manually shut down the computer as it is locked.  I then started the computer in SAFE mode and ran a full scan again. Same results. It finds the trojan, but can't remove it. I then went on line and tried a free online scanner called  ESET. It found nothing. I then downloaded some Microsoft Scanning Tool. It found the same trojan. It said something about Quarantee, but I did not see an option to remove the trojan. I tried downloading that Housecall from Trend Micro, but it would not download. I have run Malwarebytes several times, it finds nothing. Now my problem is that when I just click on Windows Defender on the desktop, it opens to where it says it found the trojan. Again, pressing the box to remove the trojan just hangs after a while. Need help, please.  Mike  UPDATE.  Not sure what happened but now when I click on Windows Defender, it opens normally. So that is good. I did a QUICK scan and it found nothing. I do not want to do a FULL scan and lock up the computer again. 

 

Edited by mike13
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Don't use Windows Defender daily, but my first step would be to find the file that was quarantined, and upload it to Jotti/Virustotal/anything comparable to check if the threat is real.

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Thanks Mcinwwl,  for the reply.  That Microsoft Scanning Tool supposedly quarantined the trojan. I also saw somewhere that the trojan was PARTIALLY removed. Have no idea what that means.

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This means that the file is quarantined - you should be able to un-quarantaine it and send to online scanner.

And I'd recommend to do so, because if you really had a trojan it somehow appeared on your PC, and might have downloaded other malware. This would require more complex cleaning.

If it would have turned out it was a false positive, then you can sleep well.

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