Microsoft Defender SmartScreen determines whether a downloaded app or app installer is potentially malicious based on many criteria, such as download traffic, download history, past anti-virus results, and URL reputation.įiles with a known safe reputation will download without any notification.įiles with a known malicious reputation show a warning to let the user know that the file is unsafe and has been reported as malicious. For more information, see how to report a site. Users are given the option of reporting a site as safe or unsafe within the warning message. The next screenshot shows an example of a Microsoft Defender SmartScreen warning page when a user tries to open a malicious website. If Microsoft Defender SmartScreen determines that a page is malicious, it will show a warning page to notify the user that that site is reported as unsafe. Checking the visited sites against a dynamic record of reported phishing sites. ![]()
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