INTEGO SECURITY ALERT - October 31, 2007  —  OSX.RSPlug.A Trojan Horse Changes Local DNS Settings to  —  Redirect to Malicious DNS Servers  —  Description: A malicious Trojan Horse has been found on several pornography web sites, claiming to install a video codec necessary to view free pornographic videos on Macs.

Source:   Intego: Leading Internet Security and Privacy Software

Link:   http://www.intego.com/news/ism0705.asp