BitTorrent Spyware Protection From Apple
Apple's most recent patch for OS X 10.6.7 included an update to Xprotect, the basic anti-virus component, that can help it to better detect malware like BitTorrent spyware. The company kept pretty quiet about this technology, and only adds identities to block when some piece of unwanted software is having an effect on many OS X users. The fact is that most spyware and malware infect a Mac by attaching themselves to something that you want, like a BitTorrent file or other downloadable content.
When you sign an End User License Agreement (EULA) for any of this content, these agreements often ask for permission to spy on your browsing habits, search behavior, online shopping and other private information. Of course, most people don't bother to read the EULA, and by clicking 'agree' they get spyware that cannot be uninstalled without a Mac guru. Xprotect still doesn't go far enough in protecting users from this software, because it only scans for malicious content in applications that use LSQuarantine.