We’ve just come across an IRC controlled backdoor that enables the infected machine to become a bot for Distributed Denial of Service attacks. The interesting part about it is that it’s a Mach-O binary – targeting Mac OS X. ESET’s research team compared this to samples in our malware collection and discovered that this code

Mac security firm Intego blogged about Apple’s decision to include an antimalware component in Mac OS X 10.6 "Snow Leopard" and we agree that it is a good step, security-wise, to provide some basic protection against malware.  Apple has long mocked Microsoft, up to and including this 2006 advertisement which implied there were no viruses