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DNS changer virus - fail to update antivirus or windows updates

Discussion in 'Malware Help - MG (A Specialist Will Reply)' started by murariua, Apr 23, 2009.

  1. murariua

    murariua Private E-2

    I got infected on 20 April ( last auto-update date from Bitdefender IS 2009) with something really nasty ! What does:
    - doesn't let me access any known antivirus WEB sites
    - block updates of Bitdefender and your tools ( I had to update them manually )
    - Windowsupdate redirected to fake Google page

    Bitdefender complain a lot about infections with Trojan.Heur.VB.xxxxxx ( some random numbers ). Even scan with BD in Safe Mode didn't resolved anything !

    Some details related to logs:
    - SuperAntySpayware run for several hours and reported some infections, most of them cleaned
    - after that I run BD in Safe Mode, over the night and removed some other infections ( log not attached here )
    - then MAMB ! After installation, I couldn't run because BD was moving mbam.exe to quarantine ( infected with Trojan.Heur.VB.xxxxx). I had to install it on my notebook, rename the mbam.exe to mbam.bat, copy on CD-RW , copy on installation directory from infected PC and start it. Run first time, removed some infections, reboot then run again
    - Combofix - couldn't run, with BD antivirus disabled . I had same approach - renamed to Combofix.bat and start. After small loading bar progress, BD just pop-up ( still disabled !! ) and after short time an error window pop-up ( see attached image )
    - MGtool - see log - I had to disable BD to allow running

    I hope you can give me a hint here !
    Thanks !

    Attached Files:

  2. chaslang

    chaslang MajorGeeks Admin - Master Malware Expert Staff Member

    Welcome to Major Geeks!

    I can see the reason for your problems. Your logs show that your Windows Operating system files have become infected and there is no known reliable fix for this. In addition there are many many other infected files. We could spend a lot of time trying to remove this infection, but odds are that it will not work because the nature of the infection has so many executable system files infected that as soon as we fix one file, other files that are infected will almost immediately or upon the next reboot, just reinfect the files. In addition, your PC would still basically be unreliable/untrustworthy even if we manage to fix the infected files that we can see since there could be many more that we are not seeing.

    The safest thing for you to do is backup your personal data immediately since your PC could possible become unbootable at any point in time. Do not back up any executable files. This includes programs that you have downloaded since any of them could be infected.

    Once you backup, you need to delete all partitions, repartition, format partitions and reinstall Windows.
  3. murariua

    murariua Private E-2

    Well, thanks for you replay, which confirm my fillings too. I did a last manually update for BD and found over 6000 infected files with different Win32.xxxx types of viruses.

    I'll save everything from my docs and start a clean installation, after partition format with Gparted live CD.

    I have to thanks to my kids for this -> they will get from now restricted user credentials.

    Keep up your good job with this site !
  4. chaslang

    chaslang MajorGeeks Admin - Master Malware Expert Staff Member

    You're welcome.

    Make sure you follow all of the instructions in the below link. You will see restricted accounts mentioned along with a lot more:


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