Hi how ya doing? The malware I am talking about is Operating System (OS) agnostic, which basically means its not dependant on the OS. It is a Network & Application layer attack. What it does is redirects your browser to other sites by changing you Domain Name Server (DNS) settings. The malware live in your browser and causes the problems from there. I know you are saying "what the heck is DNS?" Well simply put Domain Name System (DNS) is a database system that translates a computer's fully qualified domain name such as medhelp.org
into an IP address.
Networked computers use IP addresses to locate and connect to each other, but IP addresses can be difficult for people to remember. For example, on the web, it's much easier to remember the domain name www.amazon.com than it is to remember its corresponding IP address (126.96.36.199). DNS allows you to connect to another networked computer or remote service by using its user-friendly domain name rather than its numerical IP address. Conversely, Reverse DNS (rDNS) translates an IP address into a domain name. It can make your internet connection unusable.
Also in past years there hasn't been may viruses or malwale created against MAC OS because of the low incidents of usage. This is no longer true, the number of MAC users vs Windows users has increased from 98% Windows to 2% MAC OS in 2000 to 85% Windows & 15% MAC. So now the evil hackers are now targeting MAC much more than they ever have. Also the advent of the iPhone (which uses MAC OSX) has further increased the development of MAC OS malware.
So yes MAC maybe somewhat more secure but it still has its security holes.