The installer is from a legitimate company, which claims to reach over 1 billion users per month with its various downloaders and adware platforms. But one widely-used software distribution tool for MacOS applications goes to great lengths to avoid being blocked as “bundleware” – using a number of anti-forensics techniques that are more common in malware code. (Note that I've explicitly allowed ssh, printer, and afp sharing in the Firewall.Security software frequently blocks “bundleware” installers – software distribution tools that bundle their advertised applications with (usually undesired) additional software – as potentially undesirable applications. After turning off screen sharing and turning on the firewall: You'll see that nmap reports that the vnc (screen sharing) port is open. To check to make sure that you can't connect to your computer via screen sharing, you can use nmap, a free command line tool for "network discovery and security auditing." This will block any incoming screen sharing connection (as well as other services). If you want to allow sharing services, click Advanced and deselect the “Block all incoming connections” checkbox." "The firewall will block all sharing services, such as file sharing, screen sharing, iChat Bonjour, and iTunes music sharing. Make sure that Screen Sharing and Remote Management (for Apple's Remote Desktop) are both unchecked.Īlso, check under Security & Privacy > Firewall and turn the Firewall on. (Note, I've been using screen sharing since OS X Leopard, and I've never seen the icon noted by de_an777 in his answer.
If your computer is being remotely accessed, it will show a little viewer icon in the menu bar.
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