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user files hidden after virus

Posted on 2011-10-24
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Last Modified: 2012-06-21
I had two different users get the same virus.  The virus marked all files on the C: drive as hidden.  I removed the virus through malwarebytes anti-malware, but after the virus was removed, the C: drive was still hidden.  I un-hid the files, but when the user who launched the virus logs in, their desktop is missing, and they cannot launch the task manager.  When right-clicking on the task bar, the option is greyed out, and similarly when they press ctrl-alt-del the option is greyed out there.  I logged on as myself or the domain admin, and the option is there.  Seems like it only happened for the user who initially launched the virus.
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Question by:Winstink
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☠ MASQ ☠ earned 2000 total points
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by:Jason Watkins
ID: 37020180
If this is a domain machine,  I would back-up all user data and re-image (reinstall Windows), then restore. I know this is the "easy" way, but in a domain environment, there should be no chance of this spreading.

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by:Winstink
ID: 37031074
I was able to un-hide the files after running the file as suggested in the article.  However, the user still cannot call task manager the "Traditional" ways. (right-click on the task bar and ctrl-alt-delete)
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by:jli168
ID: 37031110
Have you try disable and enable it in registry?

User Key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\
System]
 System Key: [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\
System]
 Value Name: DisableTaskMgr
 Data Type: REG_DWORD (DWORD Value)
 Value Data: (0 = default, 1 = disable Task Manager)
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by:Winstink
ID: 37057794
turns out the virus was not completely gone.  Ran a full system scan of MWAM, and it's gone now.  
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