What is the point?
I fail to see the point in making malware for Mac OS. Anything worth making malware for is nearly always on a system with a Windows client somewhere along the line. Sure, there's more malware for Windows, but there's more to Microsoft's approach to security behind it. Take a look at CVE Details and you'll find Mac OS one of the most poorly rated OS's for potential exploits, they're just not taken advantage of.