It’s a piece of malware, designed to abuse and imitate legitimate macOS functionality to direct users to scam websites. This revolves around what happens when the user opens a file that no app on the system knows how to open. Normally, macOS will ofer to search the App Store for you. When the FakeFileOpener malware is installed, the user is instead redirected to a page that indicates they may be infected with malware, offering malicious downloads to remedy the situation.
