1. /
  2. Security Response/
  3. Backdoor.Haxdoor.S

Backdoor.Haxdoor.S - Removal

Risk Level 1: Very Low

Discovered:
January 9, 2007
Updated:
February 13, 2007 1:03:15 PM
Type:
Trojan Horse
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

Removal using the Backdoor.Haxdoor.S/Trojan.Schoeberl.E Removal Tool
Symantec Security Response has developed a removal tool to clean the infections of Backdoor.Haxdoor.S and Trojan.Schoeberl.E. Use this removal tool first, as it is the easiest way to remove this threat.

Manual Removal:


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  1. Restart the computer using the Windows Recovery Console.
  2. Disable System Restore (Windows Me/XP).
  3. Update the virus definitions.
  4. Run a full system scan.
  5. Delete any values added to the registry.
For specific details on each of these steps, read the following instructions.

1. To restart the computer using the Windows Recovery Console
To remove this threat it is necessary to restart the computer and run the Windows Recovery Console. For full details on how to do this please read the Microsoft Knowledge Base article: How to install and use the Recovery Console in Windows XP.
    1. Insert the Windows XP CD-ROM into the CD-ROM drive.
    2. Restart the computer from the CD-ROM drive
    3. Press "R" to start the Recovery Console when the "Welcome to Setup" screen appears.
    4. Select the installation that you want to access from the Recovery Console, if you have a dual-boot computer.
    5. Enter the administrator password
    6. Press Enter
    7. Type cd system32
    8. Press Enter
    9. Type del qo.dll
    10. Press Enter
    11. Type del qo.sys
    12. Press Enter
    13. Type del eetvpn.sys
    14. Press Enter
    15. Type del eetvpn.dll
    16. Press Enter
    17. Type del eexvpn.sys
    18. Press Enter
    19. Type del gsvga.bin
    20. Press Enter
    21. Type del mnsvgas.bin
    22. Press Enter
    23. Type del lps.dat
    24. Press Enter
    25. Type del ttsvga.dat
    26. Press Enter
    27. Type del tnstt.a3d
    28. Press Enter
    29. Type del wagfola4w.dat
    30. Press Enter
    31. Type del shsvga.bin
    32. Press Enter
    33. Type del kgctini.dat
    34. Press Enter
    35. Type del r0xcr.a3d
    36. Press Enter
    37. Type exit
    38. Press Enter. The computer will now restart automatically.
2. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

3. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions:
    • If you use Norton AntiVirus 2006, Symantec AntiVirus Corporate Edition 10.0, or newer products, LiveUpdate definitions are updated daily. These products include newer technology.
    • If you use Norton AntiVirus 2005, Symantec AntiVirus Corporate Edition 9.0, or earlier products, LiveUpdate definitions are updated weekly. The exception is major outbreaks, when definitions are updated more often.
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to Virus Definitions (Intelligent Updater).

    The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.
4. To run a full system scan
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected, follow the instructions displayed by your antivirus program.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

5. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to and delete the following subkeys:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\eexvpn
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\eetvpn
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\eexvpn.sys
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\eexvpn.sys
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\eetvpn

  5. Navigate to the following subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

  6. In the right pane, restore the following entry to its previous value, if required:

    "EnforceWriteProtection" = "0"

  7. Exit the Registry Editor.



Writeup By: Elia Florio

Search Threats

Search by name
Example: W32.Beagle.AG@mm
STAR Antimalware Protection Technologies
Internet Security Threat Report, Volume 17
Symantec DeepSight Screensaver