The botnet is directly linked to a previously known Trojan that was embedded into pirated copies of Apple s iWorks program. It was being used in the past to launch denial-of-service attacks. The full analysis of the botnet has been made available at Virus Bulletin [subscription required] The full report is available in the full version of this article by ZDNet, CBC, The Register and The Washington Post. It is the first malicious botnet made up of machines running Apple’s Mac operating system.
Source: https://threatpost.com/mac-os-x-malware-turns-dos-botnet-041709/72592/