If the file isn't on that list, Microsoft Defender SmartScreen shows a warning, advising caution.īenefits of Microsoft Defender SmartScreen Checking downloaded files against a list of files that are well known and downloaded frequently.If it finds a match, Microsoft Defender SmartScreen shows a warning to let the user know that the site might be malicious. Checking downloaded files against a list of reported malicious software sites and programs known to be unsafe.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. Analyzing visited webpages and looking for indications of suspicious behavior.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.

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