Summary: A new Mac OS X Trojan referred to as OSX/Crisis silently infects OS X 10.6 Snow Leopard and OS X 10.7 Lion. It then spies on the user by monitoring Adium, Firefox, Microsoft Messenger, Safari, and Skype.
Read more:
http://www.zdnet.com/new-mac-malware-spies-on-you-via-adium-firefox-safari-skype-7000001665/