Computers running Mac OS X are at risk of being infected with the Flashback Trojan (opens in new tab), malicious software designed to steal personal information and passwords.
This malware takes advantage of vulnerabilities in Java if you do not have the latest version installed.
UF IT Security strongly recommends running Apple Software Update (opens in new tab) and installing Antivirus software (opens in new tab).
Check your Mac for Flashback (opens in new tab) [Kaspersky Lab]