SecureMac is reporting that it has discovered multiple variants of a new Trojan horse in the wild that affects Mac OS X 10.4 and 10.5.
The Trojan horse is currently being distributed from a hacker website, where discussion has taken place on distributing the Trojan horse through iChat and Limewire.
The Trojan horse runs hidden on the system, and allows a malicious user complete remote access to the system, can transmit system and user passwords, and can avoid detection by opening ports in the firewall and turning off system logging. Additionally, the AppleScript.THT Trojan horse can log keystrokes, take pictures with the built-in Apple iSight camera, take screenshots, and turn on file sharing. The Trojan horse exploits a recently discovered vulnerability with the Apple Remote Desktop Agent, which allows it to run as root.
SecureMac is recommending people to run MacScan 2.5.2 but it’d stand to reason that other security software would be updated to address the threat by now.