Apple has silently updated malware definitions in OS X to block a trojan discovered on the Internet earlier this week. Known as Trojan.SMSSend.3666, the code comes disguised as an installer for various apps. Opening the installer prompts people to "activate" their software by SMS, entering a key into the installer after receiving an initial text. The reality
is that the trojan is signing users up for a subscription service that charges them via their cellphone bill.