VBS.Gpremier@mm

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Discovered: February 06, 2003
Updated: February 13, 2007 11:48:33 AM
Type: Worm
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows NT, Windows XP



VBS.Gpremier@mm is a mass-mailing worm that is written in the Visual Basic Scripting (VBS) language. When it is executed, it copies itself to the \Windows\System folder and infects all the HTML files with the VBS.CandyLove virus.

VBS.Gpremier@mm mails itself to all the contacts in all the Microsoft Outlook Address Books. The email would have the following characteristics:
Subject: NO estimado Bill G.
Attachment: gpremier.vbs

NOTE: Virus definitions dated prior to February 7, 2003 may detect this as Bloodhound.VBS.Worm.

Antivirus Protection Dates

  • Initial Rapid Release version February 07, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version February 07, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date February 12, 2003

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

Writeup By: Jason Pan

Discovered: February 06, 2003
Updated: February 13, 2007 11:48:33 AM
Type: Worm
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows NT, Windows XP


When VBS.Gpremier@mm is executed, it attempts to do the following:

  1. Copies itself as C:\Windows\System\Gpremier.vbs.
  2. Adds the value:

    gpremier    "wscript.exe c:\windows\system\gpremier.vbs %"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the Trojan runs when you start Windows.
  3. Checks the value of html:  

    in the registry key:

    HKEY_CURRENT_USER\software\gpremier

    If the value is not 1, the worm writes the VBS.CandyLove virus to all the HTML files as an embedded VBScript. Then, it sets the value of html

    in the registry key:

    HKEY_CURRENT_USER\software\gpremier

    to 1, so that the HTML files are infected only once.
  4. Checks the value of correo

    in the registry key:

    HKEY_CURRENT_USER\software\gpremier

    If the value is not 1, the worm attempts to email all the contacts in the Microsoft Outlook Address Book.

    The message that the worm sends is:

    Subject: NO estimado Bill G.
    Message Body:
    Hola que tal,
    Aqui le adjunto los precios para su funeraria.
    Attachment: gpremier.vbs

    Then, it sets the value of correo

    in the registry key:

    HKEY_CURRENT_USER\software\gpremier

    to 1, allowing the email routine to be performed only once.
  5. Changes the Internet Explorer home page by modifying the Value Data of Start Page

    to:

    http:/ /www.gpremier.com.mx

    in the registry key:

    HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Internet Explorer\Main

    so that this particular Web page opens when you start Internet Explorer.
  6. Changes the Internet Explorer window title by modifying the Value Data of Window title

    to:

    Perteneces al TecPremier

    in the registry key:

    HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Internet Explorer\
    Main\Window title

  7. Checks the value of colgar

    in the registry key:

    HKEY_CURRENT_USER\software\gpremier
    • If the value has not been set, the worm sets the value to 0.
    • If the value is equal to or greater than 10, the worm attempts to run 101 copies of C:\Windows\Notepad.exe, and then sets the value to 0.
    • If the value is less than 10, the worm increases the value by 1.

  8. Checks the value of borrar

    in the registry key:

    HKEY_CURRENT_USER\software\gpremier
    • If the value has not been set, the worm sets the value to 0.
    • If the value is equal to or greater than 3, the worm attempts to delete the following files:
      • All the .jpg files in the C:\Windows directory.
      • All the .bmp files in the C:\Windows folder.
      • All the files in the C:\Windows\Escritorio folder.
      • All the files in the C:\misdoc~1\ folder.

        Then, the worm sets the value to 0.
    If the value is less than 3, the worm increases the value by 1.

    9. Copies itself using one of these file names:
    • Leme.txt.vbs
    • Importante.txt.vbs
    • Archivo.vbs
    • Juegos.vbs
    • Mensaje.txt.vbs
    • Solitario.vbs

    10. Sends "www.gpremier.com.mx" as keystrokes to the active application.


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: Jason Pan

Discovered: February 06, 2003
Updated: February 13, 2007 11:48:33 AM
Type: Worm
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows NT, Windows XP


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

  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as VBS.Gpremier@mm or VBS.CandyLove.

    NOTE: If the files are detected as infected with VBS.CandyLove, refer to the VBS.CandyLove writeup for additional removal instructions.
  3. Reverse the changes that the worm made to the registry.
  4. Reset the Internet Explorer home page

For specific details on each of these procedures, 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.Gpremier@mm or VBS.CandyLove, click Delete.

    NOTE: If the files are detected as infected with VBS.CandyLove, refer to the VBS.CandyLove writeup for additional removal instructions.

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, and 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:

    gpremier    "wscript.exe c:\windows\system\gpremier.vbs %"
  5. Navigate to and delete the key:

    HKEY_CURRENT_USER\software\gpremier
  6. 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 you want to set as your home page.
  3. Click the Tools menu, and then click Internet Options.
  4. In the Home page section of the General tab, click Use Current.
  5. Click OK to exit.


Writeup By: Jason Pan