1. Symantec/
  2. Security Response/
  3. VBS.Celeron.Worm

VBS.Celeron.Worm

Risk Level 1: Very Low

Discovered:
December 23, 2002
Updated:
February 13, 2007 11:54:18 AM
Type:
Worm
Systems Affected:
Windows

When the VBS.Celeron.Worm runs, it does the following:
  • Displays the fake message:


  • Copies itself as the following files:
    • C:\Windows\System32\Ken32.vbs
    • C:\WindowsS\System\Scrip.txt.vbs
    • C:\WindowsS\Prueba.vbs
    • C:\Program Files\Kazaa\My Shared Folder\Cristina.jpg.vbs
    • C:\Program Files\Kazaa\My Shared Folder\Lesbianas.jpg.vbs
    • C:\Program Files\Kazaa\My Shared Folder\Sexo.jpg.vbs
    • C:\Program Files\Kazaa\My Shared Folder\Video porno.jpg.vbs
    • C:\Program Files\Kazaa\My Shared Folder\Anal.jpg.vbs
    • C:\Program Files\Kazaa\My Shared Folder\Britney.jpg.vbs
      NOTE: These paths and filenames, including the double letter S in C:\WindowsS, are hard-coded in the worm.
    As a result, if you have KaZaA installed, other KaZaA users may download the worm files from your computer.
  • Adds the values:
    Run C:\WINDOWS\system32\Ken32.vbs
    Windll C:\WINDOWS\system\Scrip.txt.vbs
    to the registry key
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    so that the worm runs when you restart Windows.
  • Creates the following files:
    • C:\Documents and Settings\Owner\Desktop\CELERON_VIVE.txt
    • C:\CELERON_VIVE.txt
      These two files are both text files that contain the following text:
      Celeron. DOLOMEDES 1.0
      YO SOY UNA FORMA DE VIDA
      NOTE: The aforementioned two files are not viral by themselves, and as such, Symantec antivirus products do not detect them.
  • Deletes the file C:\Autoexec.bat.
  • Attempts to download and run the file Fotos.html from a predefined Web site, if the current system date is the 24th of the month.


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
Summary| Technical Details| Removal

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