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Mal/Generic-L, Sus/CFNBehav-A and sdra64.exe

QC

I've seen several Mal/Generic-L detections reported lately. As they are infrequent and are dealt with by Sophos one way or the other I didn't think much about them. Today one has been detected on a co-workers machine right across the hall. Since the quarantine was empty (probably because of scan-on-write) I changed cleaning to "move", obtained the sample and sent it to Sophos. We first suspected something from a website (using Firefox) but as there were more detections (several minutes to more than half an hour apart) and also when Firefox was closed I started a scan (with HIPS scanning enabled). This time something turned up: sdra64.exe in the system32 directory detected (in the rootkit scan phase) as Sus/CFNBehav-A.

I've sent in this one too and am waiting for the results.     

Christian

:2431


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    Final words:

    the manipulated userinit.exe is now detected as Troj/Zbot-OA. To recapitulate: generic detection raised suspicion, a subsequent scan with Scan for suspicious files (HIPS) enabled spotted sdra64.exe. I found the other item (userinit.exe) because logon did not work. Now that IDEs are available the files are immediately detected. But IDEs can only be written if someone bothers to dig a little and sends in a sample.  

    Guess I won't find out how this junk got onto the machine though - my co-worker's of the prudent type ...

    Christian

    :2501
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  • 0

    Final words:

    the manipulated userinit.exe is now detected as Troj/Zbot-OA. To recapitulate: generic detection raised suspicion, a subsequent scan with Scan for suspicious files (HIPS) enabled spotted sdra64.exe. I found the other item (userinit.exe) because logon did not work. Now that IDEs are available the files are immediately detected. But IDEs can only be written if someone bothers to dig a little and sends in a sample.  

    Guess I won't find out how this junk got onto the machine though - my co-worker's of the prudent type ...

    Christian

    :2501
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