W32.Vote.K@mm

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Discovered: September 05, 2003
Updated: February 13, 2007 12:07:00 PM
Also Known As: Bloodhound.W32.VBWORM
Type: Worm
Systems Affected: Windows


W32.Vote.K@mm is a mass-mailing worm that overwrites and deletes numerous files on an infected system. The worm uses Microsoft Outlook to send itself to all the contacts in Outlook Address Book and attempts to spread through the KaZaA file-sharing network. The email has the following characteristics:
Subject: THE WAR HAS STARTED !
Attachment: WTC32.scr

When W32.Vote.K@mm is executed, it displays a message titled "WORLD TRADE CENTER." The worm also attempts to overwrite .com, .exe, .scr, .bmp, .jpg, .mp3, .mpg, .rar, .wav, and .zip files with a copy of itself.

This worm is written in the Microsoft Visual Basic programming language.

NOTE: Definitions dated September 8, 2003 or earlier may detect this threat as Bloodhound.W32.VBWORM.

Antivirus Protection Dates

  • Initial Rapid Release version September 08, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version September 08, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date September 10, 2003

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

Writeup By: Yana Liu

Discovered: September 05, 2003
Updated: February 13, 2007 12:07:00 PM
Also Known As: Bloodhound.W32.VBWORM
Type: Worm
Systems Affected: Windows


When W32.Vote.K@mm is executed, it does the following:

  1. Displays the following message:




  2. Displays another message that is randomly chosen from the list, which the worm carries. The title of the message reads:

    VICTIM # ***

    where *** is a random number.

  3. Attempts to copy itself as the following files:
    • C:\Windows\notepad.exe
    • C:\Windows\WTC32.scr
    • C:\Autorun.com
    • C:\NT-Help.com
    • C:\Op_Me.co_
    • C:\Documents and Settings\All Users\Desktop\Welcome.scr

  4. Creates the following files:
    • C:\Microsoft NT Help.html, which is 149 bytes in size.
    • C:\Autostart.bat, which is 2,146 bytes in size.
    • C:\Autorun.bat, which is 2,146 bytes in size.
    • C:\WTC.txt, a file that contains the text, "You Are A Victim Of The WTC Worm !"
    • C:\WTC32.dll, a file that contains the text, "Users In Harmony With God !"

  5. Creates a folder, C:\suPs, and copies C:\Autostart.bat as yyybp.bat to this folder. The worm also adds a Recycle bin under this folder.

  6. Overwrites all the .com, .exe, and .scr files in all the drives and folders, except the root folders, with itself.

  7. Overwrites all the .bmp, .jpg, .mp3, .mpg, .rar, .wav, and .zip files in all the drives and folders, except the root folders, with itself. The worm also adds a second extension, .exe, to the files.

    For example, if C:\Windows\Waves.bmp exists, the worm deletes this file, and then makes a copy of itself as C:\Windows\Waves.bmp.exe.

  8. Overwrites the .htm, .html, and .htt files with C:\Microsoft NT Help.html.

  9. Overwrites the .ai, .doc, .pif, .psd, .rtf, and .txt files with C:\Microsoft NT Help.html, and the adds a second extension, .htm, to the files.

  10. Overwrites the .bat files with Autostart.bat.

  11. Copies Autostart.bat as the following:
    • C:\Windows\Start Menu\Programs\StartUp\cniad.bat
    • C:\Documents and Settings\All Users\Start Menu\Programs\Start up\NTFS.bat

  12. Overwrites Win.ini.

  13. Overwrites System.ini with the following text:

    [boot]
    shell=explorer.exe C:\Windows\pbbgt.bat

  14. Attempts to delete the following files:
    • C:\Windows\System32\*.dll
    • C:\Windows\System32\*.ocx
    • C:\Windows\*.sys
    • C:\*.*

  15. Adds a value:

    "W32Tc"="C:\Windows\WTC32.scr"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  16. Modifies the values:
    • "RegisteredOwner"="YOU ARE A VICTIM OF THE"
    • "RegisteredOrganization"="WORLD TRADE CENTER"
    • "ProductName"="w32.hllw.I-Worm.WTC.03"

      in the registry key:

      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion

  17. Modifies the value:

    "Start Page"="c:\Windows\WTC32.scr"

    in the registry key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main

  18. Adds a value:

    "WtcSnd"=1

    in the registry key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion

  19. Creates the folder, C:\Windows\Systm32, and attempts to copy itself as the following:
    • C:\Windows\Systm32\18_Britney_Sucking_Sex_
    • C:\Windows\Systm32\Teen_P**sy_Hardcore_Sex_
    • C:\Windows\Systm32\XXX_Christina_Celebrities_Pamela_Sex_Screensaver_
    • C:\Windows\Systm32\XXX_Teens_Hot_Gauge_Aria_Jennifer_Sex_Screensaver_
    • C:\Windows\Systm32\F**king_Hot_Horny_Screensaver_|
    • C:\Windows\Systm32\Orgy_Incest_Illegal_Sex_

      with one of the following extensions:

      .jpg.scr
      .mpg.scr
      .avi.scr

  20. Creates a file, Pict232.reg, and uses this file to add the following values:
    • "DisableSharing"="0"
    • "DownloadDir"="C:\Program Files\KaZaA\My Shared Folder"
    • "Dir0"="012345:C:\Windows\Systm32"
    • "Dir1"="012345:C:\"

      to the registry key:

      HKEY_CURRENT_USER\Software\Kazaa\LocalContent

  21. Uses Microsoft Outlook to send itself to all the contacts in Outlook Address Book.

    The email has the following characteristics:

    Subject: THE WAR HAS STARTED !
    Message:
    <Recipients.name>, THE WAR IS NOT A JOKE !... THERE IS ONE BUILDING UP RIGHT NOW
    Let's Unite In This Horrible Kaos. ... Fight For Us....!!!
    ...And Let Us Remember Those Lost Souls ! WE COUNT ON YOU !
    Greetings,
    World War Veterans.
    Attachment: WTC32.scr

  22. Creates an mIRC script, C:\Program Files\mIRC\Script.ini, which it uses to spread via mIRC.


Recommendations

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: Yana Liu

Discovered: September 05, 2003
Updated: February 13, 2007 12:07:00 PM
Also Known As: Bloodhound.W32.VBWORM
Type: Worm
Systems Affected: Windows


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

NOTE: If the worm has already run, it may have overwritten or deleted required program and operating system files. If Windows does not start, first you will need to re-install it, or replace it from a clean backup. If your Symantec antivirus program does not start, re-install it as well.

  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as W32.Vote.K@mm.
  3. Reverse the changes made to the registry. Restore the files that the worm overwrote from a clean backup.
  4. Reset the Internet Explorer home page.

For specific details on each of these steps, read the following instructions.

1. Updating 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 on U.S. business days (Monday through Friday). 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.

2. Scanning for and deleting 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 W32.Vote.K@mm, click Delete.

    NOTE: As mentioned in the "Technical Details" section, the worm overwrites a variety of files. These files cannot be repaired and must be deleted. Restore the files that you deleted from a clean backup or re-install the file's software.

3. Reversing the changes made to 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 the specified keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    W32Tc c:\windows\WTC32.scr

  5. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion

  6. In the right pane, double-click each of these values:

    "RegisteredOwner"="YOU ARE A VICTIM OF THE"
    "RegisteredOrganization"="WORLD TRADE CENTER"
    "ProductName"="w32.hllw.I-Worm.WTC.03"

    and change them as necessary.

  7. Navigate to the key:

    HKEY_CURRENT_USER\Software\Kazaa\LocalContent

  8. In the right pane, change the value data of "Start Page" as necessary.

    "DisableSharing"=0
    "DownloadDir"="C:\Program Files\KaZaA\My Shared Folder"
    "Dir0"="012345:C:\Windows\Systm32"
    "Dir1"="012345:C:\"

  9. Exit the Registry Editor.


4. Resetting the Internet Explorer home page
  1. Start Microsoft Internet Explorer.
  2. Connect to the Internet and go to the page that you want to set as your home page.
  3. Click Tools, and then click Internet Options.
  4. In the Home page section of the General tab, click Use Current, and then click OK.



Writeup By: Yana Liu