W32/Klez is an internet worm capable of spreading through the local network under Windows 32-bit systems. There are many different variations of this virus which have each derived from the original.  It uses an exploit (a security hole) that allows the attachment to be executed when viewing the message with Microsoft Outlook Express or Outlook (without Service Packs installed). This method is similar to the one used by Nimda or Kak worms.

Green Apple has added the subject line "Spice girls' vocal concert" to our virus blocker. Hopefully this will block some occurrences of the Klez virus, but as variants and modified versions of the virus appear, it is possible it will still get through. If you receive any copies of the virus, send the subject line of the virus to support@greenapple.com and we will add it to our blocked senders list.

For more information, check out our PC Sentry site which contains a short write-up and links to both Norton and McAfee antiviral services.

http://www.greenapple.com/support/security/pc-sentry

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