The Zhelatin worm is a fairly serious plague on the Internet right now — you may have seen it recently in its most pervasive form, an email offering a “free greeting card”. (It’s often loosely referred to as the “storm worm”, since it’s an evolution of the worm that occurred earlier this year, which spammed users with the malware attached as a file, to emails about a storm in Europe. Now, instead of an attachment, it simply tries to get users to a website through spammed emails. The website attempts to install the malware through exploits.)
This worm is vicious and nasty, and the spams are quite ubiquitous. User education, fully patched systems and current AV software are your best bulwark against this one.