A new variant of the Mac malware Proton has been found dating back to at least two years ago. Calisto is thoroughly dead at this point, but there are still potential security implications involved with these older infections. This malware is effectively dead, as the server it attempts to call home to no longer exists. It will still gather password-related files, just like later variants of Proton, meant for exfiltration to a malicious server (which is no longer responding) Its important to ensure that these files do not exist on your system.”]