Ultimate Defender is one of the numerous bogus anti-spyware programs, which pretend to be genuine. With the help of cons and scare tactics, it tries to make the victim pay for its phony registered version.
Most of the times, users do not even notice they have been infected with the rogue unless it's too late, and the program has managed to creep into their machine. This happens due to the fact that the infection is transmitted with the help of Trojans, laid in compromised websites. Only one click on such a website downloads the Trojan. From then on, strange alerts start appearing, claiming that the PC has been infected with a number of viruses.
In addition to the common rogue tricks, the advertising of Ultimate Defender includes desktop background hijacking - the rogue places its own desktop. Apart from the fact that the ad looks frightening, it is extremely tricky – clicking anywhere on your desktop activates it and it tries to download the program. Malicious advertising is not this rogue's only con. Once it enters a computer, it performs automatic scans of the PC, which are bogus, of course, but they manage to scare some users into believing that their computer system is at great risk. Then the victim is prompted to purchase the fake registered version of the malware. It is a fact, however, that the full version of Ultimate Defender is uncapable of coping with viruses since it is a virus itself. Therefor, you should not waste your money on this counterfeit product.
If you experience some of the symptoms of this infection – strange alerts, changed desktop background or any kind of pop-up or a program window with the name Ultimate Defender, you should immediately run a scan of your computer with a legitimate anti-virus tool and remove the rogue!