VBS.LoveLetter.BJ

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Updated: February 13, 2007 11:46:44 AM
Also Known As: VBS.LoveLetter.Variant, I-Worm.LoveLetter, VBS/Loveletter@MM, VBS.Plan.D
Type: Worm


VBS.LoveLetter.BJ is a variant of the VBS.LoveLetter worm. Definitions dated prior to February 26, 2001 detect the worm as VBS.Plan.D or VBS.LoveLetter.Variant. The worm uses Microsoft Outlook to infect other systems. The payload overwrites files based on their extensions.

Antivirus Protection Dates

  • Initial Rapid Release version October 10, 2000
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version October 10, 2000
  • Latest Daily Certified version August 20, 2008 revision 016

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

Writeup By: Neal Hindocha

Updated: February 13, 2007 11:46:44 AM
Also Known As: VBS.LoveLetter.Variant, I-Worm.LoveLetter, VBS/Loveletter@MM, VBS.Plan.D
Type: Worm


When executed, the worm does the following:

  1. It copies itself into:
    • The \Windows folder as Reload.vbs.
    • The \Windows\System folder as Linux32.vbs.
    • The \Windows\System folder as a randomly generated four-to-eight-character file ending in .gif.vbs, .jpg.vbs, or .bmp.vbs. The file names that the worm creates appear in all capital letters, and are formatted so that every even-numbered letter is a vowel, for example, SOXU, DEII, YIEUHUDI, BILALU, and so on.
  2. To ensure that it runs when Windows starts, it sets two keys in the Windows registry:
    • To the key:

      HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

      it adds the values:

      Plan colombia

      and

      LINUX32
    • To the key:

      HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices

      it adds the value:

      reload
  3. The worm then checks to see if a default download folder is set for Microsoft Internet Explorer. If it is not, it sets C:\ as the default.
  4. VBS.LoveLetter.BJ the creates the file Us-president-and-fbi-secrets.htm in the \Windows folder, but this file is not loaded.
  5. The worm uses MAPI to call Microsoft Outlook, and attempts to send messages to all addresses in the Microsoft Outlook address book. The worm marks the recipients in the registry, and attempts to send them mail only once.


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: Neal Hindocha

Updated: February 13, 2007 11:46:44 AM
Also Known As: VBS.LoveLetter.Variant, I-Worm.LoveLetter, VBS/Loveletter@MM, VBS.Plan.D
Type: Worm


To remove this worm:

  1. Delete all .vbs files that are detected as VBS.LoveLetter.BJ.
  2. Delete the Us-president-and-fbi-secrets.htm file from the \Windows folder.
  3. Run Regedit, and delete the following registry keys:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\plan colombia
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\LINUX32
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices\reload
  4. (Optional) If the Logos.sys and Logow.sys files have been modified, restore them from the original Windows disks
  5. (Optional) Search all local hard disks for hidden .mp3 and .mp2 files. Remove the hidden attribute from these files.

    NOTE: The overwritten files can be recovered if you were running Norton SystemWorks or Norton Utilities NProtect at the time of infection.


Writeup By: Neal Hindocha