Hit by AV.EXE virus - Cannot run any programs

I recently got hit by the AV.EXE virus. This was a really bad virus. I got a pop up which looked as if it was a windows dialogue box telling me to install this anti spyware/virus scanner. I knew I should not even touch the popup box and not even try to close it. The best way was to kill the process. I used System Explorer which is a really good task manager replacement. It is available from http://systemexplorer.mistergroup.org/. Once killed, I wanted to make sure I wasn’t infected any further, so I started my spyware scanner called Malwarebytes’ Anti-Malware.
Surprisingly the AV.EXE popup came back and on top of that, my malwarebytes program didn’t start. I killed the process once again and tried starting malwarebytes again and the av.exe popup came back!! Damn what was going on!! After killing the process once again I tried Superantispyware and it too had the same fate… I was now perplexed… I tried a random program and after seeing that too starting the popup, finally realized that my registry had been compromised. The virus had modified my registry in such a way that it would get enabled whenever I would start any executable. I then thought I better do more research on this before I screw up my machine even further. Here is what I found

• I had to right click the Malwarebytes program and use Run as.. to run the program as administrator
• Update the program and run it and remove any instance of the virus
• Cleaning the system broke my registry. I couldn’t run any programs anymore.
• The registry was fixed with the following file. Save the following in a file called fixit.reg

  Windows Registry Editor Version 5.00
  
  [HKEY_CLASSES_ROOT\.EXE]
  @="exefile"
  "Content Type"="application/x-msdownload"
  
  [HKEY_CLASSES_ROOT\.EXE\PersistentHandler]
  @="{098f2470-bae0-11cd-b579-08002b30bfeb}"
  
  [HKEY_CLASSES_ROOT\exefile]
  @="Application"
  "EditFlags"=hex:38,07,00,00
  "FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\
    00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,\
    32,00,5c,00,73,00,68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\
    00,2c,00,2d,00,31,00,30,00,31,00,35,00,36,00,00,00
  
  [HKEY_CLASSES_ROOT\exefile\DefaultIcon]
  @="%1"
  
  [HKEY_CLASSES_ROOT\exefile\shell]
  
  [HKEY_CLASSES_ROOT\exefile\shell\open]
  "EditFlags"=hex:00,00,00,00
  
  [HKEY_CLASSES_ROOT\exefile\shell\open\command]
  @="\"%1\" %*"
  "IsolatedCommand"="\"%1\" %*"
  
  [HKEY_CLASSES_ROOT\exefile\shell\runas]
  
  [HKEY_CLASSES_ROOT\exefile\shell\runas\command]
  @="\"%1\" %*"
  "IsolatedCommand"="\"%1\" %*"
  
  [HKEY_CLASSES_ROOT\exefile\shellex]
  
  [HKEY_CLASSES_ROOT\exefile\shellex\DropHandler]
  @="{86C86720-42A0-1069-A2E8-08002B30309D}"
  
  [-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.exe\UserChoice]
  

• Double click and execute this file. This fixes the registry

I think I should start browsing in a sandbox so I don’t infect my pc. I have a couple of options, but I think the easiest is to just use Sandboxie which is available at http://www.sandboxie.com/. Other ways I can protect myself is to use a limited user account instead of using an admin account. Ohh well…

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