Open System Preferences. Select “Security & Privacy”. Click Open Anyway.

If the system has no malware, you will see a message that says no threats were found. If threats were found, a list will appear in a pop-up window. Unless otherwise noted, you should remove all threats found by the application.

Blue: If you don’t recognize the file, quarantine it to avoid passing it on to others. Orange: You should definitely quarantine the file. Red: You should definitely delete this file. Green: The file has been neutralized. No action is necessary.