BAT.WCup.B@mm

SUMMARY

Several variants of BAT.WCup.B@mm have been discovered; all are script worms. When BAT.WCup.B@mm runs, it attempts to distribute itself using Microsoft Outlook and mIRC.

This threat may appear in email in this format:

Subject: Korean New Tactics To Defeat Germans
Message: Tactics to win over the Germans!
Attachment: Germany_sucks.bat

or

Subject: Which pub in Singapore is the best in the world?
Message: Read me to find out!!!!
Attachment: Reame.TXT.vbs

If you receive this email message, delete it without opening any attachments.

BAT.WCup.B@mm creates a folder in the root of the hard drive and copies itself to that folder. The exact folder names that it creates may vary. Some examples are:

• C:ProKorea.jpg.bat
• C:I_LOVE_CHINA_BLACK_AT_PACIFIC_PLAZAChinaboy.jpg.bat

The virus also attempts to modify the mIRC configuration file to send Korea.jpg.bat or Chinaboy.jpg.bat when an infected machine connects to IRC channels.

Protection

• Virus Definitions (LiveUpdate™ Weekly) July 3, 2002
• Virus Definitions (Intelligent Updater) June 27, 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
• Payload Trigger: Upon execution
• Large Scale E-mailing: Attempts to send itself to all recipients in the Outlook Address Book.
• Deletes Files: attempts to delete files, "C:Progra~1Kasper~1Avp32.exe", "C:Progra~1Norton~1*.exe", "C:Progra~1Trojan~1Tc.exe", "C:Tbavw95Tbscan.sig", "C:PrograNorton~1S32integ.dll", "C:PrograF-prot95Fpwm32.dll", "C:PrograMcafeeScan.dat", "C:ProgpaTbavTbav.dat", "C:PrograAvpersonalAntivir.vdf"
• Modifies Files: Attempts to modify both win.ini and system.ini

Distribution

• Distribution Level: Low
• Subject of Email: Korean New Tactics To Defeat Germans or Which pub in Singapore is the best in the world?
• Name of Attachment: Germany_sucks.BAT or reame.TXT.vbs
• Size of Attachment: 10,018 bytes or 10,511 bytes

TECHNICAL DETAILS

When BAT.WCup.B@mm runs, it does the following, depending on the variant:

Variant 1
It attempts to use Microsoft Outlook to email itself. The email message is in this format:

Subject: Korean New Tactics To Defeat Germans
Message: Tactics to win over the Germans!
Attachment: Germany_sucks.bat

Next, it searches for an installation of mIRC and modifies the configuration file to send a copy of the worm as Korea.jpg.bat.

It creates several files in the current folder:

• Cha_du_ri.bat (89 bytes): This contains the [windows] section of the Win.ini file, with instructions to load Wini.bat.
• Korea_rulez.vbs (127 bytes): This is a short script that runs Korea_rulez.bat from the Windows folder.
• Koreans_.reg (150 bytes): This is a registry import file that--if run manually--creates the value
  
  sexywormbykoreaofgalaxynetirc#vx
  
  and sets it equal to
  
  %windir%germans_suxs.bat
  
  in the registry key
  
  HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun

• Germany_sucks.bat and Koreans_win_germans.bat (10,018 bytes): These are copies of BAT.WCup.B@mm.

BAT.WCup.B@mm creates these files in the Windows folder:

• Dd.ini (89 bytes): A duplicate of Cha_du_ri.bat
• Korea_win_worldcup2002.vbs (134 bytes): A short script that runs Korea_worldcup2002.bat from the Windows folder.
• Koreans_.reg (150 bytes): A duplicate registry import file. Neither registry import file is executed by this threat.

Finally, the virus creates copies of itself in the Windows folder as:

• Germans_suxs.bat
• Korea_rulez.bat
• Korea_wins.bat
• Korea_worldcup2002.bat
• Worldcup2002_korea.bat
• Start MenuProgramsStartUpKoreans_koreans.bat
• SystemWini.bat

Variant 2

The virus attempts to use Microsoft Outlook to email itself. The email message is in this format:

Subject: Which pub in Singapore is the best in the world?
Message: Read me to find out!!!!
Attachment: Reame.TXT.vbs

Next, it searches for an installation of mIRC and modifies the configuration file to send a copy of the worm as Chinaboy.jpg.bat.

It creates several files in the current folder,

• I_love_china.bat (97 bytes): This contains the [windows] section of the Win.ini file, with instructions to load C:WindowsSystemWini.bat and run C:WindowsSystemqi.
• China_hunks.vbs (126 bytes): This is a short script that runs China_boys.bat from the Windows folder.
• China.reg (122 bytes): This is a registry import file that--if run manually--creates the value

 vbyeg

and sets it equal to

 WINDOWSchina_babes.bat

in the registry key

HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun

• I_love_chinablack.bat (10,511 bytes): This is a copy of BAT.WCup.B@mm.

BAT.WCup.B@mm creates these files in the Windows folder:

• Chinaboy_loves_china.vbs (126 bytes): A duplicate of China_hunks.vbs
• Chinaboy_rulez_chinablack.vbs (136 bytes): A short script that runs Chinaboy_rulez.bat from the Windows folder.
• China.reg (122 bytes): A duplicate registry import file.

It also creates copies of itself in the Windows folder as:

• China_boys.bat
• China_babes.bat
• China_girls.bat
• China_ladies.bat
• Chinaboy_rulez.vbs
• Chinaboy_rulez.bat
• Chinaboy_rulez_chinablack.vbs
• China_china_china.bat
• Startm~1ProgramsStartUpchina_males.bat
• SystemWini.bat

It creates the shortcut file C:Pif.lnk that links to C:WindowsChinaboy_rulez_chinablack.vbs

All variants
All variants attempt to delete these files:

• C:Progra~1Kasper~1Avp32.exe
• C:Progra~1Norton~1*.exe
• C:Progra~1Trojan~1Tc.exe
• C:Tbavw95Tbscan.sig

All variants attempt to delete these files, but usually fails due to invalid path names:

• C:PrograNorton~1S32integ.dll
• C:PrograF-prot95Fpwm32.dll
• C:PrograMcafeeScan.dat
• C:ProgpaTbavTbav.dat
• C:PrograAvpersonalAntivir.vdf

Finally, it reduces the size of the System.ini configuration file to only a few bytes, with an instruction to load C:WindowsKoreans_win_germans.bat or C:WindowsChina_china_china.bat.

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

NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

Update the virus definitions, run a full system scan, and delete all files that are detected as BAT.WCup.B@mm. For details on how to do this, read the following instructions.

To scan for and repair the infected files:

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 your Symantec antivirus software and make sure that it is configured to scan all files.
   • Norton AntiVirus Consumer products: Read the document How to configure Norton AntiVirus to scan all files.
   • Symantec Enterprise antivirus 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. Delete all files that are detected as BAT.WCup.B@mm.