VBS.DWorld.A

SUMMARY

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.

Protection

• Virus Definitions (Intelligent Updater) January 18, 2001

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Medium
• Modifies Files: modifies .vbs and .vbe files on specific directory. also modifies AUTOEXEC.BAT
• Causes System Instability: disable mouse and keyboard

Distribution

• Distribution Level: Medium
• Subject of Email: Hello :]

TECHNICAL DETAILS

When executed, the worm does the following:

1. The files copied to the system folder are:
   
   Windows 95/98/Me
   WindowsWinsock.vbs
   WindowsSysdir.vbs
   WindowsSystemMilioner.vbs
   WindowsSystemDragonball.vbs
   WindowsSystemDragonball.cab
   
   Windows NT/2000
   WinntWinsock.vbs
   WinntSysdir.vbs
   WinntSystem32Milioner.vbs
   WinntSystem32Dragonball.vbs
   WinntSystem32Dragonball.cab
   
2. Changes registry keys:
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunwinsock2.0
   
   value is "c:\Windowswinsock.vbs"
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentViersionRunServiecessysup
   
   value is "c:\Windowssysdir.vbs"
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionReisteredOwner
   
   value is "Dragon Ball Z by YuP"
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftInternet ExplorerMainStart Page
   
   value is "http://bdball.metropoli2000.net/fotos/imagenes/sagas/foto7_40.jpg"
   
   HKEY_LOCAL_MACHINESoftwareOUTLOOK.Dball_Z
   
   value is "1"
   
3. Spreads itself using mIRC by
   
   Creating the following .ini files:
   C:MircScript.ini
   C:MircUpdate.ini
   
   Modifying the following .ini file:
   C:MircMirc.ini
   
   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
   http://bdball.metropoli2000.net/
   mmedia/videos/clips/dballz.gokuhss1.mpg
   
7. Creates and modifies .bat files:
   
   The worm creates C:WindowsDragonball.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.

Recommendations

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

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

REMOVAL

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
     • WindowsWinsock.vbs
     • WindowsSysdir.vbs
     • WindowsSystemMilioner.vbs
     • WindowsSystemDragonball.vbs
     • WindowsSystemDragonball.cab
   • Windows NT/2000
     • WinntWinsock.vbs
     • WinntSysdir.vbs
     • WinntSystem32Milioner.vbs
     • WinntSystem32Dragonball.vbs
     • WinntSystem32Dragonball.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.
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunwinsock2.0
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentViersionRunServiecessysup
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionReisteredOwner
   
   HKEY_LOCAL_MACHINESoftwareOUTLOOK.Dball_Z
   
   HKEY_LOCAL_MACHINESoftwareNedua.Goku
   
6. Replace the startup page for your Web browser.