BAT.WCup@mm

SUMMARY

Bat.WCup@mm is a batch file worm that spreads via Microsoft Outlook. The message is:
Subject: WorldCup News!
Message: Read me for more world cup news!
Attachment: Worldcup_score.vbs. or Worldcup.bat

If you receive this email message, delete it without opening any attachment(s).

Protection

• Virus Definitions (LiveUpdate™ Weekly) June 11, 2002
• Virus Definitions (Intelligent Updater) June 11, 2002

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: Low

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

Bat.WCup@mm spreads using Microsoft Outlook and attempts to spread using mIRC. The email message is as follows:

Subject: WorldCup News!
Message: Read me for more world cup news!
Attachment: Worldcup_score.vbs. or Worldcup.bat


Bat.WCup@mm sends a batch file (see the list of possible batch file names that follows) that, when executed, does the following:

1. Creates, and may or may not subsequently delete the following files:
   • Argentina.bat
   • Worldcup.bat
   • World_cup_.bat
   • Germany.bat
   • China.bat
   • Turkey.bat
   • Russia.bat
   • Denmark.bat
   • Wini.bat
   • Costarica.bat
   • Spain.bat
   • Funny.bat
   • Italy.bat
   • Worldcup_score.vbs
   • Japan.vbs
   • England.vbs
   • Ireland.vbs
   • Uraguay.vbs
   • Paraguay.vbs
   • Brazil.vbs
   • Dd.ini
   • Eyeball.reg
   • Pif.lnk
   • Vbs.lnk
     
     Most of these files are created in the \%Windows% or Windows\%System% folders. Turkey.bat is added to the WindowsStartMenuProgramsStartup folder.
     
     NOTES:
     • %Windows% is a variable. The worm locates the Windows folder (by default this is C:Windows or C:Winnt) and copies itself to that location.
     • %System% is a variable. The worm locates the WindowsSystem folder (by default this is C:WindowsSystem or C:WinntSystem32) and copies itself to that location.
       
2. The script creates the C:ThisIsOnlyASimpleWorm folder.
3. It replaces the Win.ini and System.ini files with commands to run one of its dropped batch or vbs files.
4. It overwrites .bat files that are in the Windows path with its own code. This includes the Autoexec.bat file.
5. It add one of these values:
   
   eifxi     china.bat
   cqlyg     world_cup_.bat
   
   to the registry key
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
6. The WindowsSystem.ini is overwritten so that only the [boot] section remains, which now calls one of the batch files that the script created.
7. The WindowsWin.ini is overwritten so that only the [Windows] load= and run= entries remain; these entries call batch files that the script created.
8. Finally, the script deletes antivirus program files. The affected files are:
   • Progra~1Norton~1*.exe
   • Progra~1Norton~1S32integ.dll
   • Progra~1Kasper~1Avp32.exe
   • Progra~1Trojan~1Tc.exe
   • Progra~1F-Prot95Fpwm32.dll
   • Progra~1 McafeeScan.dat
   • Progra~1TbavTbav.dat
   • Progra~1AvpersonalAntivir.vdf

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

If BAT.WCup@mm runs, it overwrites numerous files, and Norton AntiVirus (NAV) may no longer run. To recover from this, you must do the following:

1. Update the virus definitions, run a full system scan, and delete all files that are detected as BAT.WCup@mm. (If NAV no longer runs, you must delete all files manually.)
2. Delete all of the files that were dropped by BAT.WCup@mm, but which Norton AntiVirus did not detect.
3. If the Autoexec.bat, Win.ini, and System.ini files were overwritten, delete and replace them from clean backups.
4. Delete whichever of the following values:
   
   eifxi     china.bat
   cqlyg     world_cup_.bat
   
   exists in the registry key
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
5. Reinstall NAV, if necessary.

For details on how to do this, read the following instructions.

To scan with Norton AntiVirus and delete the infected files:

NOTE: If Norton AntiVirus no longer runs, go on to the next section.

1. Obtain the most recent virus definitions. There are two ways to do this:
   • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
   • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.
     
     Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
     
2. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files.
   • NAV Consumer products: Read the document How to configure Norton AntiVirus to scan all files.
   • NAV Enterprise products: Read the document How to verify a Symantec Corporate antivirus product is set to scan All Files.
3. Run a full system scan.
4. Write down the names of any files that are detected as Bat.WCup@mm, and then delete them.

To delete dropped files that NAV did not detect (or all dropped files, if NAV no longer runs):

1. Start Windows Explorer.
2. Delete any of the following files that were not deleted by the NAV scan (or all of them, if NAV no longer runs). They will exist in either the Windows or the WindowsSystem folder:
   • Argentina.bat
   • Worldcup.bat
   • World_cup_.bat
   • Germany.bat
   • China.bat
   • Turkey.bat
   • Russia.bat
   • Denmark.bat
   • Wini.bat
   • Costarica.bat
   • Spain.bat
   • Funny.bat
   • Italy.bat
   • Worldcup_score.vbs
   • Japan.vbs
   • England.vbs
   • Ireland.vbs
   • Uraguay.vbs
   • Paraguay.vbs
   • Brazil.vbs
   • Dd.ini
   • Eyeball.reg
   • Pif.lnk
   • Vbs.lnk
     
3. If the Autoexec.bat, Win.ini, and System.ini files were overwritten, delete and replace them from clean backups.

To remove the value from the registry:

CAUTION: Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions.

1. Click Start, and click Run. The Run dialog box appears.
2. Type regedit and then click OK. The Registry Editor opens.
3. Navigate to the following key:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
4. In the right pane, delete whichever of the following values is present:
   
   eifxi     china.bat
   cqlyg     world_cup_.bat
   
5. Click Registry, and click Exit.

To reinstall NAV:
If Norton AntiVirus is no longer running, reinstall it from the original installation files or CD.