Threat Explorer

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VBS.Loding.A@mm

VBS.Loding.A@mm

Discovered:
15 August 2001
Updated:
13 February 2007
Also Known As:
VBS/Loding.A@mm

VBS.Loding.A@mm is a script which uses an exploit to run arbitrary code. It contains instructions to send email using Microsoft Outlook. The email message contains a link that would have downloaded a virus; however, the page that it linked to has been closed.

The email message is in the following format:

Subject: Computer Secrets !
Message: If you are using Win9x/Me, visit the following page will upgrade your pc performance. If you are not using Win9x/Me or don't want to upgrade your pc, only forward this page to your friends. Maybe your friends need it. <dead link>

If you clicked the link (while it was still active), it would have gone the Web page and run the script, which would have perpetuated itself.



Additional precautions that you can take:
  • If you are using Norton AntiVirus 2002, which includes Script Blocking, make sure that Script Blocking is enabled (the default).
  • If you are using Norton AntiVirus 2001, a free program update that includes Script Blocking is available. Please run LiveUpdate to obtain this.
  • For earlier versions of Norton AntiVirus, SARC offers a tool to disable the Windows Scripting Host.


Antivirus Protection Dates

  • Initial Rapid Release version 16 August 2001
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 16 August 2001
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

The script uses a vulnerability in Java VM to run its code. The vulnerability affects only Internet Explorer.

Microsoft has a patch released to address this vulnerability: FIX: Java Security Issue Allows Access to ActiveX Controls , Article ID: Q275609.

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.

Run LiveUpdate to make sure that you have the most recent virus definitions.
  1. Start Norton AntiVirus (NAV), and run a full system scan. Be sure that NAV is configured to scan all files.
  2. Delete all files that are detected as VBS.Loding.A@mm.


Writeup By: Patrick Nolan