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KnockKnock shows you what's persistently installed on your Mac. 

Malware installs itself persistently, to ensure it is automatically executed each time a computer is restarted. KnockKnock (UI) uncovers persistently installed software in order to generically reveal such malware. If the item is an executable binary, KnockKnock automatically queries VirusTotal with a hash of the binary in order to retrieve any information.

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