Best malware removal tool
What is the best malware removal tool for Mac mini running MacOS 10.11.15?
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The most trusted (and really, only trusted) such software is MalwareBytes for Mac. It's free to use and easily uninstalled from its menu option when you're done with it.
Like any such tool, it can't, and never can be 100% successful. But it's a good place to start to see what it can find and remove for you.