Intego Malware Research Team discovered that OSX Flashback trojan is still active with sinkholing activity. Mac users must be aware of the threat. Flashback Trojan is a cyber threat known since 2011, it is a trojan horse that targeted a Java vulnerability on Mac OS X machines, early 2012 it spread to infect up to 600,000 machines as new variants were using Java exploits and drive-by downloads. With a botnet composed of 650,000 infected machines the creators of Flashback could rise a revenue of $10,000 per day.”]
Source: http://securityaffairs.co/wordpress/21152/malware/flashback-botnet-still-active.html