http://www.f-secure.com/weblog/archives/00002051.html
Riding on Firefox's\Chrome's ability to block attack sites, Security Tool, a rogue antivirus application, is attempting a new trick. This time, when an unsuspecting user visits the page, it gets a very authentic-looking block page. But, this is no ordinary block page. It is special in the sense that it offers a download that you can install to update your browser!