1) Trojan horse 
The RSPlug Trojan horse, a form of DNSChanger, is malware targeting the Mac OS X operating system. The first incarnation of the trojan, OSX.RSPlug.A, was discovered on October 30, 2007 by the Mac security experts at Intego. ==Variants== Several variants of the RSPlug trojan were found primarily on pornographic sites disguised as video codecs, and ...