If you’re running Mac OS X 10.4 or 10.5, there’s a nasty Trojan horse out in wild that antivirus firm SecureMac has spotted being distributed from a hacker website. Taking advantage of a vulnerability of the Apple Remote Desktop agent, the Trojan does every sort of bad thing to your computer.According to SecureMac, the Trojan runs hidden on a Mac and allows a malicious user complete remote access. The Trojan can transmit system and user passwords, and avoid detection by opening ports in the firewall and turning