Macs are not immune to malware, but they are pretty well-protected. By default, macOS won’t allow unrecognized apps to be installed, and it needs the user to agree to override this. Even when they are installed, sandboxing limits the damage that can be done, which is why most Mac malware is actually adware – annoying but not damaging.
A common way for attackers to get malware onto a Mac is to disguise it as something else, to trick technically naive users into installing it. Fake installers for Adobe Flash Player are particularly favored, and Malwarebytes has found a variant that’s nastier than usual …
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