Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.

VBS.LoveLetter.CD

VBS.LoveLetter.CD

Discovered:
07 February 2001
Updated:
13 February 2007
Also Known As:
CARTOLINA.A, VBS_LOVELETTER.CD, VBS/LOVELETTER.CD, VBS/JER
Download Removal Tool

This worm spreads as an email attachment, CARTOLINA.VBS. If your computer is infected by this worm, it will use the Microsoft Outlook address book to propagate itself. It cannot propagate itself if Outlook is not installed on your computer.

It tries to send itself out each time that the attachment is executed. It also changes the default pages of Internet Explorer.

Norton AntiVirus currently detects this as VBS.LoveLetter.Variant.

Antivirus Protection Dates

  • Initial Rapid Release version 07 February 2001
  • Latest Rapid Release version 03 March 2008 revision 035
  • Initial Daily Certified version 07 February 2001
  • Latest Daily Certified version 03 March 2008 revision 037
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

The following is a sample of a VBS.LoveLetter.CD email message:
Subject:

C'è una cartolina per te!

Message Body:

Ciao, un tuo amico ti ha spedito una cartolina virtuale... mooolto particolare!

Attachment:

CARTOLINA.VBS

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.

Current virus definitions detect this worm as VBS.LoveLetter.Variant. If an attachment is detected as infected with VBS.LoveLetter.Variant, it should be deleted.

Virus definitions that detect this variant with the new variant name, VBS.LoveLetter.CD, will be available in the next definition update to be released on February 14, 2001. To obtain the new definition earlier than that date, if you suspect a file is infected with VBS.LoveLetter.CD, you can submit the file to SARC using Scan & Deliver (submit the file from Norton AntiVirus Quarantine).

Corporate customers can also obtain Spec Definitions (Beta definitions that have not yet been through the full testing process) from their usual sources. (This is not necessary for most users. Current definitions will protect you from this threat; run LiveUpdate to obtain the most recent virus definitions.)
Writeup By: JP Duan