Discovered on May/08/03, Fizzer (a.k.a. W32/Fizzer@MM, W32/Fizzer.A, and Worm/Fizzu.A worm) spreads via email and the KaZaA P2P network. According to antivirus vendor F-Secure, Fizzer contains a built-in IRC backdoor, a DoS (Denial of Service) attack tool, a data stealing trojan, an HTTP server and autoupdating capabilities. The worm also has the ability to disable certain antivirus programs.

Breaking out simultaneously throughout the world on Sept/19/01, a mass-mailing email worm began actively launching a Distributed Denial of Service (DDoS) attack across the Internet. Dubbed W32/Nimda.a@mm by most antivirus vendors (the exception is McAfee who refers to it as W32/Minda@mm) the worm spreads itself via email, taking advantage of security vulnerabilities to automatically execute on the user's system.

Securing your mail client is just one of the lessons necessary to achieve optimum security against email threats. If you have not already done so, visit the Email Help Center for tips on spotting malicious attachments and the do's and dont's of email security. Merk W. from Denmark provides the following tips for securing Eudora:

Antivirus software is simply not enough. An email worm can spread worldwide in just seconds, but it takes hours for antivirus vendors to analyze, create, and deploy signature updates. Fortunately, there are five easy steps you can take to help close that window of vulnerability and help keep email worms off your system.

The attachment will have a .exe, .scr, or .ziq extension, but it may also use a double extension ruse to hide the executable extenion on some versions of Windows. Enable file extension viewing to correctly identify the extension.

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