Welcome to the party Mac owners. This trojan horse program “Flashback” surfaced last last year is reported by several sources to have created a botnet on more than 600,000 Macs around the world, with more than half of them in the US alone.
Apple released a Java Security update on Tuesday to resolve the vulnerabilities that the malware is exploiting, but not before a number of Mac users had been hit with the malicious software. Oracle first issued a fix for the vulnerability in February as reported by AppleInsider.
CNNTech has a Mashable article here that shows you how to find out if your Mac has the Flashback Trojan. After determining whether you are infected or not be sure you install the latest Apple security update to fix the vulnerability.