And let me tell you there's nothing fun about them. For those of whom who have had such an attack, they often download more rouge-software to make their removal nearly impossible......... Worse off, if a user doesn't know that it is a fake, then they give the program access to the files at which it kills making the unsuspecting victim's life on the computer very very miserable.
I was getting at least 5 or 6 of these infections per day at my last job. I became an "expert" at removing the infections with a 98% success rate. The process involved using Process Explorer, a secondary account, and other tech tools. Once I figured out the infection vector and operation, I was able to snuff it out pretty quickly since the problem with the process was the time consumption. In the home environment, one can take as much time as needed for malware removal. In the corporate IT environment, time equals downtime for an employee which leads to lost production. This was particularly important in the sale environment where I worked as I supported the sales arm of the company I was with.
John