Threat Explorer

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VBS.Vbswg2.Z@mm

VBS.Vbswg2.Z@mm

Discovered:
17 May 2001
Updated:
13 February 2007
Also Known As:
VBS.VBSWG-based [Kaspersky], VBS/SST@MM [McAfee], VBS.VBSWG.Z [Computer Associat, VBS_VBSWG.Z [Trend], VBS/VBSWG-Z [Sophos]
Systems Affected:
Windows


VBS.VBSWG2.Z@mm is an encrypted VBScript worm that sends itself to all recipients in your Microsoft Outlook address book. It arrives as the attachment Mawanella.vbs.



If you are using Norton AntiVirus 2001, and have downloaded and enabled Script Blocking, you are protected from this and similar worms that rely on scripts to run.

Antivirus Protection Dates

  • Initial Rapid Release version 17 May 2001
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 17 May 2001
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 17 May 2001
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

VBS.VBSWG2.Z@mm sends itself to all recipients in your Microsoft Outlook address book. The email message has the following characteristics:

Subject: Mawanella
Message: Mawanella is one of the Sri Lanka's Muslim Village
Attachment: Mawanella.vbs

If Microsoft Outlook is not installed, the worm will just display the message:
Please Forward this to everyone

The worm creates a copy of itself as \Windows\System\Mawanella.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.

Run LiveUpdate to make sure that you have the most recent virus definitions.
  1. Start Norton AntiVirus (NAV), and run a full system scan, making sure that NAV is set to scan all files.
  2. Delete any files detected as VBS.VBSWG2.Z@mm.


Writeup By: Serghei Sevcenco