A year ago today, Apple released a software update to halt the spread of the Flashback worm. The malware infected more than 650,000 Mac OS X systems using a vulnerability in Apples version of Java. The worm was the first OS X malware to be VMware aware or to know when it was being run in a virtual environment. The author of Flashback is a founding member of BlackSEO.com, a closely guarded Russian language forum dedicated to this topic.”]
Source: https://krebsonsecurity.com/2013/04/who-wrote-the-flashback-os-x-worm/