If the file does not have established reputation - and therefore is a higher risk of being malicious - you are shown a warning. IE9 and later: Information about downloaded files, such as a hash of the file and the file’s digital signature, may be checked against an online service to determine the reputation of the downloaded program.If it finds a match, SmartScreen will warn you that the download has been reported as potentially unsafe. IE8 and later: Microsoft Defender SmartScreen can check site information (URLs) for sites you visit or files that you download from the web against a dynamic, online list of reported malicious software sites.If it finds a match, SmartScreen will provide you a warning notifying you that the site has been reported as potentially unsafe.

IE7 and later: Microsoft Defender SmartScreen can check sites (URLs) you visit against a dynamic, online list of reported phishing sites.Microsoft Defender SmartScreen helps to protect you in these key ways: In Internet Explorer 8 and later, SmartScreen also helps protect you from downloading malicious software. It is designed to help protect you from websites Microsoft believes are fraudulent that try to steal your personal information. Microsoft Defender SmartScreen is a feature of Windows, Internet Explorer, and Microsoft Edge.

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