A massive campaign to spread the worm is Koobface In-the-Wild using blogs as a strategy generated from the Blogspot service. The malware is almost two years of activity with a significant rate of infection, making it one of the largest botnets today. Blogspot domains used as cover for the spread are: Blogspot.com.com, Blogspot, Bloggers.com and Bloggerspace.com. The malicious code is another malicious code that uses persistence despite many of its variants are detected by most antivirus companies.”]
Source: http://malwareint.blogspot.com/2009/12/koobface-campaign-spread-through.html