“Apple has silently updated malware definitions in OS X to block a trojan discovered on the Internet earlier this week,” MacNN reports.

“Known as Trojan.SMSSend.3666, the code comes disguised as an installer for various apps,” MacNN reports. “Opening the installer prompts people to ‘activate’ their software by SMS, entering a key into the installer after receiving an initial text.”

MacNN reports, “The reality is that the trojan is signing users up for a subscription service that charges them via their cellphone bill.”

More info and links in the full article here.

[Thanks to MacDailyNews Reader “Lynn Weiler” for the heads up.]