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Mydoom/Novarg is Fastest Spreading Worm Ever

The fastest spreading worm ever packs a punch, and some new twists. The worm, known as MyDoom.B or W32.Novarg.A@mm, is a mass e-mail worm that is spread via attachments and the Kazaa network. It can arrive in various file types, such as .exe, .cmd, .bat, .pif, .scr or .zip files.

The worm has been called "the worst e-mail worm incident in virus history," by F-Secure, a Finish network security company. It has been estimated by Message Labs that 1 in 12 e-mail messages carried on the Internet is generated by the worm. "This is the most aggressive [worm] that we have seen to date," said Mark Sunner, chief technology officer for MessageLabs.

Multiple Punches

Once activated, the worm:

What to Look For

The worm sends itself as an attachment to e-mail. Its subject line consists of: "test," "hi," "hello," "Mail Delivery System," "Mail Transaction Failed," "Server Report," "Status," or "Error." The attachment will be named either "document," "readme," "doc," "text," "file," "data," "test," "message," or "body". Don't touch an e-mail with any of these characteristics.

Once installed it will search the computer's local and network disks to find any file likely to contain any e-mail addresses. It then uses those e-mail addresses as targets for its randomly generated, virus-infected e-mails.

Not to leave the much-maligned file sharing users alone, the worm also copies itself to the default Kazaa file sharing directory. It masquerades itself as a half dozen different popular downloads.

What to Do

  1. Don't open attachments that you are not expecting.
  2. Keep your software up-to-date.
  3. Follow the Computer Security Tips.
  4. Increase Business security.

See Also

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