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VBS.Plan

Risk Level 2: Low

Discovered:
June 6, 2000
Updated:
February 13, 2007 11:56:05 AM
Also Known As:
VBS.President.Worm, VBS/Columbia, VBS.LoveLetter.AS, VBS.LoveLetter.BJ, I-Worm.Plan
Type:
Worm


When executed, the worm copies itself into the following locations:
  • Windows folder as Reload.vbs
  • Windows\System folder as Linux32.vbs
  • Windows\System folder as a randomly generated 4- to 8-character file ending in .gif.vbs, .jpg.vbs, or .bmp.vbs

The worm checks whether Winfat32.exe exists in the Windows\System folder. If the file is present, the worm randomly sets the Internet Explorer Start Page to one of the following Web addresses:
Depending on which file is downloaded, the worm performs the following action:
  • Copies Macromedia32.zip as the hidden file Important_note.txt in the Windows folder and modifies the registry to load this text file at startup.
  • Copies Linux321.zip as \Windows\Syslogos.sys to replace the screen that is displayed when Windows has shut down.
  • Copies Linux322.zip as \Windows\Logow.sys to replace the screen that is displayed when Windows is shutting down.

The worm also creates the file Us-president-and-fbi-secrets.htm in the Windows folder, but this file is not loaded.

The worm uses MAPI calls to the Microsoft Outlook application and creates messages by iterating through all addresses in the Microsoft Outlook address book. The worm marks these recipients using the registry in an attempt to send them the mail only once.

The randomly generated file names 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.

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: Brian Ewell
Summary| Technical Details| Removal

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