These are usually anti-spyware or security software applications that use various forms of deception and/or unethical means or show a history of negligent false positives to goad the end user to make a purchase.
In some cases these applications maybe downloaded with some form of unwanted software at which point the rogue application is offered to the customer as a way to remove the unwanted software.
Comment:
Ultimate Cleaner is a rogue Anti Spyware / Adware product, which shows fake malware detections on users machine.It also installs through Exploits , Malware bundlers.
Screenshots:
Ultimate Cleaner, which installed through Adware infection
4 [