Nowadays everyone will tell you that most virus, spyware, malware and other malicious definitions are written solely for Windows, but it appears that times have changed a bit. Security experts are warning now about a new Trojan horse released in the wild, targeting Apple operating systems or more specifically Mac OS X Tiger and Leopard (version 10.4 and 10.5). In addition to the usual stuff a trojan can do (run in background, open ports, steal your passwords, replicate etc.) this one can also log what you type in every moment, take screenshots of your active desktop and even take a picture of you using Mac's built-in iSight camera. Here's how it works: AppleScript.THT comes either as a 3.1MB application dubbed AStht_v06 or as a 60KB compiled AppleScript script called ASthtv05. Once started on a Mac OS system it adds itself to the System Login Items and thus runs with root privileges every time the OS is started. Once the system is infected AppleScript.THT also moves itself into the /Library/Caches/ folder. To protect your system against this threat, security experts advice to run SecureMac MacScan 2.5.2 anti-virus software with the latest Spyware Definitions update (2008011). More details on the malicious code and additional removal instructions are posted here.