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unidentified malware creating appdata/temp folders

Posted on 2014-10-31
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Last Modified: 2014-11-07
At one or more a minute, new folders are created in Logged in User/appdata/temp. The folders names are 3 or 4 characters in length such as, 1eec or 3bc5, or 2d3f. Each folder contains a sub-folder "Appdata" among other things. As the number of folders increases in to the 1000s, the PC's performance degrades.

I cannot find any reference to any malware, etc. that describes this behavior. The folders can be easily and quickly deleted in Safe Mode. I ultimaley resolved this issue by going back to a restore point a couple of days prior to the infection.

Neither Symantec EndPoint 12.1.5, or Malwarebytes, or YAC found anything awry on this PC. However, Malwarebytes was reporting some "Malicious OUTBOUND activity".

Anybody have a clue what this was?

tom
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Question by:tuckertf
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John Hurst earned 2000 total points
ID: 40416523
Download, install and run Process Explorer from Microsoft (Sysinternals).  Look down the folder tree on the left for Explorer and see if there is a strange alphanumeric process running there. If so, Kill the process and do NOT restart the computer. Run Malwarebytes again, delete malware. Now restart and see if the temp file creation stops.
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Author Comment

by:tuckertf
ID: 40428439
Thanks for input. At original site I was able to clear the malware.
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LVL 98

Expert Comment

by:John Hurst
ID: 40428458
@tuckertf  - Thanks for the update and I was happy to help.
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