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Best (Premium) Internet Security Software It's a cruel world out there, with no shortage of malware, ransomware and phishing attacks to swoop in and steal your data, money and personal information. The antivirus program “Mac Internet Security X9” by Intego was best in the antivirus test of June 2018 (macOS). It was followed by “Bitdefender antivirus for Mac 2018” and “Norton Security Deluxe 2018”.