SpyAxe is a rogue antispyware program that uses extremely deceptive behavior to get on a system, and is very difficult to remove.
A new player, SpywareStrike, looks to be a rebrand of SpyAxe.
Running a quick test shows a terrifying warning message about… cookies. You must spend $49.50 to remove these cookies.
Suzi Turner at ZDNET also writes about it here.