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Discovered: January 17, 2001
Updated: February 13, 2007 11:48:00 AM
Type: Worm, Virus

VBS.DWorld.A is a Visual Basic Script worm. The worm attaches itself to an email message and is sent to everyone in the address book. The worm also uses mIRC to spread.

The payload is a displayed message; the mouse and keyboard are disabled on the 1st and 27th of every month.

Antivirus Protection Dates

  • Initial Rapid Release version January 18, 2001
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version January 18, 2001
  • Latest Daily Certified version September 28, 2010 revision 036

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

Writeup By: Kaoru Hayashi

Discovered: January 17, 2001
Updated: February 13, 2007 11:48:00 AM
Type: Worm, Virus

When executed, the worm does the following:

  1. The files copied to the system folder are:

    Windows 95/98/Me

    Windows NT/2000
  2. Changes registry keys:


    value is "c:\\Windows\winsock.vbs"


    value is "c:\\Windows\sysdir.vbs"


    value is "Dragon Ball Z by YuP"

    HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\Start Page

    value is "http://bdball.metropoli2000.net/fotos/imagenes/sagas/foto7_40.jpg"


    value is "1"
  3. Spreads itself using mIRC by

    Creating the following .ini files:

    Modifying the following .ini file:

    After running mIRC clients, the worm is sent. The name of the attached file is Dragonball.vbs.
  4. Sends an email message using Outlook:

    The worm sends an email message to all addresses in the Outlook address book. The message is:

    Subject:Hello ;]
    Message:Hi , check out this game that j sent you (funny game from the net:])

    A bug in the code prevents the worm from attaching.
  5. Infects .vbs and .vbe files:

    The worm infects .vbs and .vbe files at the following locations:
    • Windows folder in Windows 95/98/Me
    • WINNT folder in Windows NT/2000
    • Desktop
    • Folder where the worm is executed
  6. Shows movies:

    Launches Windows Movie Player, and opens the movie from
  7. Creates and modifies .bat files:

    The worm creates C:\Windows\Dragonball.bat and adds its path to the Autoexec.bat file.

    Dragonball.bat is only for showing message at startup:

    DraGon Ball [Z] by YuP
    Thank you and bye bye dragon world!!
  8. On the 1st and 27th of every month, the following message appears:

  9. The mouse and keyboard are disabled.


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.

Writeup By: Kaoru Hayashi

Discovered: January 17, 2001
Updated: February 13, 2007 11:48:00 AM
Type: Worm, Virus

The following instructions are general instructions for removing viruses.

  1. Run LiveUpdate to make sure that you have the most recent virus definitions.
  2. Start Norton AntiVirus (NAV), and then run a full system scan, making sure that NAV is set to scan all files.
  3. If any files are found to be infected by VBS.DWorld.A, VBS.DWorld.ini or VBS.Dworld.bat. then click Delete.
  4. Using Windows Explorer, delete the following files:
    • Windows 95/98/Me
      • \Windows\Winsock.vbs
      • \Windows\Sysdir.vbs
      • \Windows\System\Milioner.vbs
      • \Windows\System\Dragonball.vbs
      • \Windows\System\Dragonball.cab
    • Windows NT/2000
      • \Winnt\Winsock.vbs
      • \Winnt\Sysdir.vbs
      • \Winnt\System32\Milioner.vbs
      • \Winnt\System32\Dragonball.vbs
      • \Winnt\System32\Dragonball.cab
  5. Delete these registry keys:

    CAUTION: We strongly recommend that you back up the system registry before making any changes. Incorrect changes to the registry could result in permanent data loss or corrupted files. Please make sure you modify only the keys specified. Please see the document How to back up the Windows registry before proceeding.





  6. Replace the startup page for your Web browser.

Writeup By: Kaoru Hayashi