OSX / MAMi, is a new malware detected by Patrick Wardle, from Objective-See, in which its execution in the macOS operating system allows third parties to keep the DNS of our computer. The truth is that the access of malware to Macs is unknown, but since it is not signed by a developer, macOS itself should reject it without any further problem unless the user himself gives it to install.
As in most cases of these detected malware, if we are responsible users with our facilities we should not have a major problem, but of course, You can always sneak something you don't want onto the Mac.
For those who do not know what DNS is, we can say in a very brief and simple way that DNS is the initials of Domain Name System and it is a technology based on a database that serves to know the IP address of the machine where the domain we want to access is hosted. The assignment of the IP address is translated by the domains and DNS.
Important privacy issue
In principle, access to DNS could be a problem even for our passwords, records or important data on the computer, and it is that they can be reached by replacing a certificate in the root of the system if we are affected by this malware. If you are one of those who install programs very often, you can perform a test to see if your computer is affected or not. For now, there are no options for malware detection so we have to be careful with what we install on our computer if we do not want to be vulnerable to this attack and other types of malware that circulate on web pages, email, unsigned applications, etc…