If it finds a match, Microsoft Defender SmartScreen shows a warning to let the user know that the site might be malicious.
Microsoft Defender SmartScreen determines whether a downloaded app or app installer is potentially malicious by: Checking the visited sites against a dynamic list of reported phishing sites and malicious software sites.
If Microsoft Defender SmartScreen determines that a page is suspicious, it shows a warning page to advise caution. Microsoft Defender SmartScreen determines whether a site is potentially malicious by: Microsoft Defender SmartScreen protects against phishing or malware websites and applications, and the downloading of potentially malicious files.
