The author of mass-mailing worm Bagle began distributing its source code and two new variants on Sunday, which could trigger another summer of misery for Windows users.

The Bagle worm first appeared in January as an e-mail attachment. Within months, there were more than 25 variants.

Infected PCs download a Trojan that effectively enlists that computer into the worm author's army of zombie PCs, which can be used to distribute spam and other malware and to launch distributed denial-of-service attacks.

This weekend saw not only two new versions of the Bagle worm released, but also what appears to be the worm's original source code.

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