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Adware and false virus alertsSquare Circle Consulting has been helping with Mac security issues more frequently lately. Here are some thoughts about these issues, and steps recommended for safer computing. As always, please backup before making any changes. AdwareAdware is software that displays unwanted ads. This software often redirects web searches and changes home pages to display ads based on search history. In some cases, ads are injected into other pages as users browse the web. Apple's article on popups and adware provides steps for manually removing some adware. Sources include deceptive updaters, such as fake Flash and Safari updates, and useful software bundled with adware. Since installers typically have full access to the Mac, users should download software directly from known, trusted companies. False virus alertsUsers have also reported seeing false virus alerts pop up while web browsing. When users call the number displayed in the warning, agents ask for a credit card number and remotely pretend to diagnose and clean the Mac via screen sharing. Since screen sharing can allow full access to the Mac, users should only allow remote control by known, trusted companies. Legitimate anti-virus software presents alerts when downloading infected files, but doesn't urge users to call a phone number. PreventionSquare Circle Consulting recommends these steps for safer computing:
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