All new versions of the Bagle/Beagle worm are important to watch as they are technically advanced and disguised well to trick users into opening attachments (use of zip extension).

Beagle.BT - (aka Bagle worm) New Variant
Beagle.BT - new version of Bagle worm

W32.Beagle.BT@mm is a mass-mailing worm that uses its own SMTP engine to send out copies of a Trojan.Tooso variant. The worm also opens a back door on the compromised computer on TCP port 80.

EMAIL FORMAT

From: Spoofed.
Subject: Blank.
Message: "The password is" or "Password:"
Attachment: ZIP ... Multiple Zip files may contain copies of the virus, plus an executable copy of the Trojan.Tooso.