Threat Explorer

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VBS.Gaggle.C

VBS.Gaggle.C

Discovered:
04 March 2003
Updated:
13 February 2007
Systems Affected:
Windows

VBS.Gaggle.C is a Visual Basic Script (VBS) worm that attempts to spread through the KaZaA, Grokster, and Morpheus file-sharing networks, and by using ICQ.

VBS.Gaggle.C uses Microsoft Outlook to send an email notification to the hacker.

Antivirus Protection Dates

  • Initial Rapid Release version 05 March 2003
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 05 March 2003
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 05 March 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When VBS.Gaggle.C runs, it does the following:
  1. Attempts to copy itself as these files:
    • C:\N30.exe
    • C:\Windows\System\Pruebita.exe
    • A:\Gente

  2. Creates the folder, C:\Windows\Gedzac, and attempts to copy itself into this folder as the file, Prueba.exe.
  3. Creates the following files:
    • C:\Info.cmd, which is 181 bytes in length.
    • C:\Informacion.html. When this file is opened, it displays the message:

      Estás infectado con un virus llamado N30/infector
    • C:\Informacion1.html. When this file is opened, it displays the message:

      You are infected with a virus called Infector/N30"
    • C:\loquito.cmd, which is 23 bytes in length. The worm uses this file to format drive C when the current day is the 15th of any month.

  4. Overwrites all the files in the root folder of drive C with C:\Info.cmd.
  5. Overwrites the C:\Autoexec.bat file.
  6. Uses Microsoft Outlook to send an email to osavaldo@Persystems.zzn.com; the email has the following characteristics:

    Subject: Infectado
    Message: Otro más
    Attachments:Ip5.txt and N30.exe

    NOTE: Due to bugs in the worm, the email, if sent, may not have any attachments.
  7. Attempts to copy itself to the following folders:
    • C:\Program Files\KaZaA\My Shared Folder
    • C:\ARCHIV~1\KaZaA\My Shared Folder
    • C:\Program File\Grokster\My Grokster
    • C:\ARCHIV~1\Grokster\My Grokster
    • C:\Program Files\Morpheus\My Shared Folder
    • C:\ARCHIV~1\Morpheus\My Shared Folder
    • C:\Program Files\icq\shared files
    • C:\ARCHIV~1\icq\shared files

      The file names that the worm copies itself as may be one or more of the following:

      NOTE: The file may have the extension .bat, .com, .exe, .pif, or .scr.
      • Pamela Anderson
      • Britney Spears
      • Thalia
      • Carmen Elecktra
      • Shakira
      • Ashley Olsen
      • Lindsay lohan
      • Chicas
      • Pampita
      • Valeria
      • Nicole newman
      • Lorena
      • Ana Kournikova
      • Carmen Electra
      • Mary Kate oleine
      • NC
      • Datafull screensaver
      • Cameron Diaz
      • Kate winslet
      • Blink 182
      • Off spring
      • Hacking Computers
      • Green Day
      • Computacion para ejecutivos

Payloads
  • If the current day is the 9th of the month, the worm displays the message:

    Te voy a eliminar el regedit;)
  • If the current day is not the 9th, the worm creates the file, C:\Windows\Ji.vbs.
  • If the current day is the 10th of any month, or later, the worm deletes the file, C:\Windows\Cmd.exe.
  • If the current day is the 1st to the 9th of any month, the worm deletes C:\Windows\Explorer.exe.


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.


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

NOTE: If the worm has overwritten required system files, you may need to restore them from a clean backup or re-install them before you can remove the worm.
  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as VBS.Gaggle.C. Manually delete the following files if they exist:
    • C:\info.cmd
    • C:\informacion.html
    • C:\informacion1.html
    • C:\loquito.cmd
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 the 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), in the "Protection" section, at the top of this writeup.
  • 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), in the "Protection" section, at the top of this writeup.

    The 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. 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 VBS.Gaggle.C, click Delete.
  4. Using Windows Explorer, delete the following files if they exist:
    • C:\info.cmd
    • C:\informacion.html
    • C:\informacion1.html
    • C:\loquito.cmd

Writeup By: Yana Liu