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Discovered: January 31, 2005
Updated: February 13, 2007 12:32:44 PM
Also Known As: VBS.Gormlez.A [Computer Associ, Email-Worm.VBS.Gormlez.a [Kasp, VBS/Gomez@MM [McAfee], VBS/Gormlez-A [Sophos], VBS_GORMLEZ.A [Trend Micro]
Type: Worm
Systems Affected: Windows

VBS.Gormlez@mm is a mass-mailing worm that sends a copy of itself to all email addresses in the Windows Address Book and attempts to spread through file-sharing networks. The worm deletes files with a .dll, .vbs, .exe, or .wsh extension.

Antivirus Protection Dates

  • Initial Rapid Release version January 31, 2005
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version January 31, 2005
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date January 31, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

When VBS.Gormlez@mm runs, it does the following:

  1. Creates the following copies of itself:

    • C:\Hello.vbs
    • %System%\VBS_Update-0548656X.vbs
    • %Windir%\WinFIX1.0.vbs
    • %Windir%\WinUpdater5.0.vbs
    • C:\ICQNET.vbs
    • %System%\G0mez.vbs

    • %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  2. Adds the following values:

    "VBS_AUTO_UPDATE" = "%System%\VBS_Update-0548656X.vbs"
    "FIX" = "%Windir%\WinFIX1.0.vbs"
    "UPDATE" = "%Windir%\WinUpdater5.0.vbs"
    "ICQ" = "C:\ICQNET.vbs"
    "G0mez" = "%System%\G0mez.vbs"

    to the registry subkey:


    so that the worm runs when Windows starts.

  3. Adds the values:

    "NoDrives" = "0x03ffffff"
    "NoRun" = "0x00000001"

    to the registry subkey:


  4. Adds the value:

    "Disabled" = "0x00000001"

    to the registry subkey:


  5. May display the following pop-up message:

    Title: This is the w0rk 0f g0mez
    Message Body: Y0ur c0mputer has been infected by G0mez!

  6. Sends a copy of itself to all entries it finds in the Windows Address Book. The email has the following characteristics:

    Subject: Re: Hello

    Message Body: Hey There :-)

    Attachment: Hello.vbs

  7. For each email address it uses, it adds the value:

    [email address] = "0x00000001"

    to the registry key:


    as a marker to avoid sending an email more than once to the same address.

  8. Attempts to spread through file-sharing networks, by copying itself as the following files:

    • %ProgramFiles%\KMD\My Shared Folder\Porno-Pic.Jpg.vbs
    • %ProgramFiles%\KMD\My Shared Folder\Cool-Games.Exe.vbs
    • %ProgramFiles%\KMD\My Shared Folder\IN-DA-CLUB.Mp3.vbs
    • %ProgramFiles%\KMD\My Shared Folder\SecretFBIDocs.doc.vbs
    • %ProgramFiles%\KMD\My Shared Folder\HowToRipDVDs.txt.vbs
    • %Program Files%\KMD\My Shared Folder\PORNO.mpg.vbs
    • %Program Files%\KMD\My Shared Folder\COOL-GAMES.exe.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\Porno-Pic.Jpg.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\Cool-Games.Exe.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\IN-DA-CLUB.Mp3.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\SecretFBIDocs.doc.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\HowToRipDVDs.txt.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\PORNO.mpg.vbs
    • %Program Files%\KaZaA Lite\My Shared Folder\COOL-GAMES.exe.vbs
    • %Program Files%\Morpheus\My Shared Folder\Porno-Pic.Jpg.vbs
    • %Program Files%\Morpheus\My Shared Folder\Cool-Games.Exe.vbs
    • %Program Files%\Morpheus\My Shared Folder\IN-DA-CLUB.Mp3.vbs
    • %Program Files%\Morpheus\My Shared Folder\SecretFBIDocs.doc.vbs
    • %Program Files%\Morpheus\My Shared Folder\HowToRipDVDs.txt.vbs
    • %Program Files%\Morpheus\My Shared Folder\PORNO.mpg.vbs
    • %Program Files%\Morpheus\My Shared Folder\COOL-GAMES.exe.vbs
    • %Program Files%\BearShare\Shared\Porno-Pic.Jpg.vbs
    • %Program Files%\BearShare\Shared\Cool-Games.Exe.vbs
    • %Program Files%\BearShare\Shared\IN-DA-CLUB.Mp3.vbs
    • %Program Files%\BearShare\Shared\SecretFBIDocs.doc.vbs
    • %Program Files%\BearShare\Shared\HowToRipDVDs.txt.vbs
    • %Program Files%\BearShare\Shared\PORNO.mpg.vbs
    • %Program Files%\BearShare\Shared\COOL-GAMES.exe.vbs
    • %Program Files%\Edonkey2000\Incoming\Porno-Pic.Jpg.vbs
    • %Program Files%\Edonkey2000\Incoming\Cool-Games.Exe.vbs
    • %Program Files%\Edonkey2000\Incoming\IN-DA-CLUB.Mp3.vbs
    • %Program Files%\Edonkey2000\Incoming\SecretFBIDocs.doc.vbs
    • %Program Files%\Edonkey2000\Incoming\HowToRipDVDs.txt.vbs
    • %Program Files%\Edonkey2000\Incoming\PORNO.mpg.vbs
    • %Program Files%\Edonkey2000\Incoming\COOL-GAMES.exe.vbs

      Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.

  9. Sets the following value:

    "DisableRegistryTools" = "0x00000001"

    in the key:


    to disable Regedit.exe and Regedt32.exe.

  10. May create the file C:\WARNING.txt and display it in a text editor:

    The file contains the following lines:

    You have been infected by G0mez!
    Go to any AV sites and update you AV software !!!
    - - Best Regards: G0mez Author

  11. May display the following Windows Script Host message and then shut down the computer:

    Shutdown.vbs,  Version 1.00
    VBS.G0mez Is here :-p
    Usage:  CSCRIPT  SHUTDOWN.VBS  [ computer_name ]
    !!!"!!!" SHUTDOWN!"
           (without leading backslashes).
           Default is "." (the local computer).
    G0mez will now shutdown the computer!
    G0mez 0wnz U :-)

  12. If the computer does not shut down , it will search through all fixed and network drives for files with the following extensions:

    • .dll
    • .vbs
    • .vbe
    • .exe
    • .wsh

  13. Deletes any files it finds and creates a copy of itself using the deleted file's name and adding .vbs as a second extension.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.


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. Run a full system scan and delete all the files detected as VBS.Gormlez@mm.
  4. Re-enable registry access.
  5. Delete the value that was added to the registry.
For specific details on each of these steps, read the following instructions.

1. 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:
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. 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: 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 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 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. To scan for and delete 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 VBS.Gormlez@mm, click Delete.

    If your Symantec antivirus product reports that it cannot delete an infected file, Windows may be using the file. To fix 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 section 4.

4. To re-enable registry access
If registry access has been disabled, do the following:
  1. Click Start > Run.
  2. Type:


    and then click OK.
  3. Type, or copy and paste, the following text into the text file:

  4. Save the file as C:\Repair.reg.
  5. Click Start > Run.

  6. Type:

    regedit -s C:\repair.reg

  7. Follow the steps in Section 5, "To delete the value from the registry."

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. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to the subkey:


  4. In the right pane, delete the values:

    "VBS_AUTO_UPDATE" = "%System%\VBS_Update-0548656X.vbs"
    "FIX" = "%Windir%\WinFIX1.0.vbs"
    "UPDATE" = "%Windir%\WinUpdater5.0.vbs"
    "ICQ" = "C:\ICQNET.vbs"
    "G0mez" = "%System%\G0mez.vbs"

  5. Navigate to the subkey:


  6. In the right pane, delete the values:

    "NoDrives" = "0x03ffffff"
    "NoRun" = "0x00000001"

  7. Navigate to the subkey:


  8. In the right pane, delete the value:

    "Disabled" = "0x00000001"

  9. Navigate to and delete the following subkey:


  10. Exit the Registry Editor.

Writeup By: Rodney Andres