PC World posted a news story that researchers at Sophos say they've spotted a new Trojan horse program written for the Mac

It's called the BlackHole RAT (the RAT part is for "remote access Trojan") and it's pretty easy to find online in hacking forums, according to Chet Wisniewski a researcher with antivirus vendor Sophos. There's even a YouTube video demonstration of the program that shows you what it can do.

  Hacker Writes Easy-to-use Mac Trojan