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W32.Lovgate.AN@mm - Removal

Risk Level 2: Low

Discovered:
August 7, 2004
Updated:
February 13, 2007 12:26:13 PM
Type:
Worm
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Reverse the changes made to the registry.
  4. Restart the computer in Safe mode or VGA mode.
  5. Run a full system scan and delete all the files detected as W32.Lovgate.AN@mm.
  6. Rename the .zmx files to the .exe files.
For details on each of these steps, read the following instructions.

1. Disabling 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, re-enable 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.

2. Updating 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: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). 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 the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.
3. Reversing the changes made to the registry

Before continuing, 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 keys only. For instructions, read the document, "How to make a backup of the Windows registry."
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)
  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the values:

    "Microsoft Inc." = "iexplorer.exe..."
    "Program In Windows" = "%System%\IEXPLORE.EXE"
    "Protected Storage" = "RUNDLL32.EXE MSSIGN30.DLL  ondll_reg..."
    "VFW Encoder/Decoder Settings" = "RUNDLL32.EXE MSSIGN30.DLL  ondll_reg..."
    "WinHelp" = "%system%\TkBellExe.exe..."


  5. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
    RunServices
  6. In the right pane, delete the values:

    "SystemTra" = "C:\WINDOWS\Video.EXE"
    "Soft Profile Inc" = "%System%\hxdef.exe..."
    "Installed shell32.dll" = "Office.exe..."


  7. Navigate to the key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

  8. In the right pane, delete the value:

    "run" = "real.exe"

  9. Navigate to the key:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services

  10. In the right pane, delete the subkeys:

    _reg
    Windows Management Protocol v.0(experimental)


  11. Navigate to the key:

    HKEY_CLASSES_ROOT\txtfile\shell\open\command
  12. In the right pane, change the value to:

    Windows 95/98/Me:
    "(Default)"="WINDOWS\NOTEPAD.EXE %1"

    Windows NT/2000/XP:
    "(Default)"="%SystemRoot%\system32\NOTEPAD.EXE %1"

  13. Exit the Registry Editor.

4. Restarting the computer in Safe mode or VGA mode
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.
5. Scanning for and deleting the infected files
  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 as infected with W32.Lovgate.AN@mm, click Delete.
  4. Restart the computer in Normal mode. For instructions, read the section on returning to Normal mode in the document, "How to start the computer in Safe Mode."

6. Renaming the .zmx files to the .exe files
As W32.HLLW.Lovgate.AN@mm modifies the .exe files, correct this for relevant programs to function correctly.
  1. Follow the instructions for your operating system:
    • Windows 98/Me/2000
      1. On the Windows desktop, click the Start button > Find or Search > Files or Folders.
      2. In the Search Results window, set "Look in" to the first removable, mapped, or fixed drive type with a drive letter greater than E.
      3. Check "Include subfolders."
      4. In the "Named" or "Search for..." box, type, or copy and paste, the following:

        *.zmx


      5. Click Find Now or Search Now.

    • Windows XP
      1. On the Windows desktop, click the Start button > Search.
      2. Click All files and folders.
      3. In the "All or part of the file name" box, type, or copy and paste, the following:

        *.zmx

      4. Verify that "Look in" is set to the first removable, mapped, or fixed drive type with a drive letter greater than E.
      5. Click "More advanced options."
      6. Select "Search system folders."
      7. Select "Search subfolders."
      8. Select "Search hidden files and folders."
      9. Click Search.

  2. For every file that is found, right click it, select "Rename," and then change the .zmx extension to .exe.

  3. Repeat step 6 for every removable, mapped, or fixed drive type with a drive letter greater than E.


Writeup By: Asuka Yamamoto

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