Trojan installs anti-virus to remove malware

A weird trojan seems to download a pirated version of Kaspersky Anti-Virus, which removes all other malware except the trojan itself. Then it does the usual thing, spam, spam, spam..

I have to admit, creative idea. This way the trojan can get more system resources to itself.

Source: http://it.slashdot.org/it/06/10/21/079200.shtml