If you go to the Malwarebytesantimalware.org website, at the top you will see 'home.' Click on that and the third one is the program for the Mac. It is free.
There was a guy who had a website The Safe Mac. I went to it every day to find out about any malware news for Mac OS X. That guy is now associated somehow with Malwarebytes Antimalware. He is working for them or consulting with them or whatever. This guy developed an anti-adware program for the Mac, and maybe that is essentially what software they are using right now.
I have always liked MBAM for Windows and now it is available for the Mac. That is really cool. I already ran the program on my computer.