"A massive spam campaign that poses as a message from the Centers for Disease Control (CDC) asking people to register for H1N1 vaccinations remains a big problem today, a security researcher said. The messages lead unwary users to a convincing-looking CDC site where they’re asked to create a profile in order to receive a vaccination for the swine flu, which has made headlines for both its aggressive spread and a lack of vaccine.
The site urges users to download a vaccination profile archive, and includes a link to that download. Clicking on the link, however, actually downloads and installs a new variant of the "Zbot" Trojan horse. Called "Zeus" by some security companies, the malware is a bot Trojan that hijacks the Windows PC for nefarious activities, including sending more spam." – Content courtesy of Botnet continues massive H1N1 malware campaign