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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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    As you can see, Sophos made analysis and protection for Troj/Zbot-NZ available within a few hours. Please note that this thing also modifies the Userinit registry entry. In addition to this modification it also seems to have manipulated userinit.exe (I've sent in this additional sample). After logon explorer.exe fails to start. Surprisingly Windows System File Checker did not complain. When I renamed it SFC immediately restored the - hopefully - clean version and since then everything seems to work again.   

    Christian

    :2459
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    As you can see, Sophos made analysis and protection for Troj/Zbot-NZ available within a few hours. Please note that this thing also modifies the Userinit registry entry. In addition to this modification it also seems to have manipulated userinit.exe (I've sent in this additional sample). After logon explorer.exe fails to start. Surprisingly Windows System File Checker did not complain. When I renamed it SFC immediately restored the - hopefully - clean version and since then everything seems to work again.   

    Christian

    :2459
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