Windows 10: Web-Browser\Microsoft Defender SmartScreen trust

Annie Owl · Jan 9, 2024

We have an installer for our software self-extracting archive signed with a GlobalSign Code Signing Certificate. It's uploaded to our server, users can download it through our website.We have encountered a couple of problems:1 When downloading our installer from our website, web browser warns the user with the message "Installer.exe isn't commonly downloaded. Make sure you trust Installer.exe before you open it." and puts the installer into quarantine.2 When you run the installer, SmartScreen warns the user with the message: "Microsoft Defender SmartScreen prevented an

:)

crionsynx · Jan 9, 2024

Microsoft Defender Smartscreen

Hi COLINGILBERT1,

Sorry to hear you're experiencing this issue. I'm an Independent Advisor and consumer of Microsoft products just like you. Let me help you with your concern.

Microsoft Defender SmartScreen checks downloaded files against a list of reported malicious software sites and known unsafe programs and against list of files that are well known and downloaded by many Windows users. If the file you downloaded is on the malicious
list or is not commonly downloaded it will show a warning, advising caution. If you believe that the file is not malicious and you trust the source then you can ignore the warning by clicking "Run anyway".

Refer to the below link for the benefits of Microsoft Defender SmartScreen.

https://docs.microsoft.com/en-us/windows/securi...

Brink · Jan 9, 2024

Windows Defender SmartScreen - File and Flash Player blockage problem

$Web-Browser\Microsoft Defender SmartScreen trust 530x375?v=1.gif$

SmartScreen has become a part of Windows 10 OS, it was named as Windows Defender SmartScreen. It is useful to protect not just Edge, Internet Explorer browsers but also other applications such as third-party browsers, Email Client and Apps from malicious Web link attack, malicious Web download threat. Let us have a quick look into SmartScreen functionalities:

Anti-phishing and anti-malware support. Microsoft Defender SmartScreen helps to protect users from sites that are reported to host phishing attacks or attempt to distribute malicious software.

Prevent drive-by attacks. Drive-by attacks are web-based attacks that tend to start on a trusted site, targeting security vulnerabilities in commonly used software. Because drive-by attacks can happen even if the user does not click or download anything on the page, the danger often goes unnoticed.

Reputation-based URL and app protection. Microsoft Defender SmartScreen evaluates a website's URLs to determine if they're known to distribute or host unsafe content. It also provides reputation checks for apps, checking downloaded programs and the digital signature used to sign a file. If a URL, a file, an app, or a certificate has an established reputation, users won't see any warnings. If, however, there's no reputation, the item is marked as a higher risk and presents a warning to the user.

Improved heuristics and diagnostic data. Microsoft Defender SmartScreen is constantly learning and endeavoring to stay up to date, so it can help to protect you against potentially malicious sites and files.

Blocking URLs associated with potentially unwanted applications.  Software that can cause your machine to run slowly, display unexpected ads, or at worst, install other software

Website blacklist block example:

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

App blocked by Defender SmartScreen example:

$Web-Browser\Microsoft Defender SmartScreen trust medium?v=1.png$

Starting with Windows 10 version 1703 to 2004 you will configure SmartScreen directly by Windows Defender SmartScreen GPO (not through Edge GPO anymore):Administrative Templates\Windows Components\Windows Defender SmartScreen\Microsoft Edge

Submit File for Whitelisting to Microsoft Security Intelligence

You may experience false positive block or warning by Defender SmartScreen when accessing in-house Web App’s URL or Website URLs and you need to whitelist those URLs.

General rule, there will usually be a direct link in the product app notification for error reporting to Microsoft Security Support. In case of Defender SmartScreen, the link shown in the notification as seen here:

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

You should provide the information to the Defender SmartScreen Support Team if your Site gets a false-positive alarm of blockage or gets a false positive warning of unknow web site, ..., the following screenshot shown the report's content:

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

For download block or download warning report of false-positive, you could manually submit the sample files by accessing the WDSI Website and choose to submit as an enterprise user or a developer user. (You could also submit file as a home user too.)

To submit file, browse to : https://www.microsoft.com/en-us/wdsi/filesubmission

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

To upload sample file with size more than 500MB, you could compress it by Zip or RAR archive.

You could report file for Blacklist to block access to it or report file for Whitelist to allow access.

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

You could submit filtering request for almost any of Microsoft’s software and service as per the dropped down list of the above Form:

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

$Web-Browser\Microsoft Defender SmartScreen trust large?v=1.png$

$Web-Browser\Microsoft Defender SmartScreen trust medium?v=1.png$

Microsoft goal is to minimize false warnings or blocks. In the rare case of a false warning, Microsoft offered a web-based feedback system to help users and website owners report any errors as quickly as possible. These reports are verified by the support team and mistakes are corrected. Enterprise Premier Customer will get the highest priority in response time.

Flash Player should be removed from the Sites after December 2020

Adobe will end support of Flash Player on December 31, 2020.

In Microsoft Edge Chromium, Flash will be disabled by default. However, users may re-enable it on a site-by-site basis.

Flash will not be disabled by default from Microsoft Edge classic (Edge legacy) or Internet Explorer 11 prior to its removal by December of 2020.

Group policies are available for enterprise admins and IT pros to change the Flash behavior

Flash will be completely removed from all browsers by December 31, 2020, via Windows Update.  Companies reliant on Flash for development and playback of content are encouraged to remove the dependency on Adobe Flash prior to December 2020.

Reference:

https://docs.microsoft.com/en-us/windows/security/threat-protection/microsoft-defender-smartscreen/m...

https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-smartscreen/win...

Available Microsoft Defender SmartScreen Group Policy and mobile device management (MDM) settings.

Detect and block potentially unwanted applications

Click to expand...

Source: https://techcommunity.microsoft.com/...e/ba-p/2066746

Turn On or Off SmartScreen for Apps and Files from Web in Windows 10

Turn On or Off SmartScreen for Microsoft Edge in Windows 10

Turn On or Off SmartScreen for Microsoft Store Apps in Windows 10

Harish_kum · Jan 9, 2024

Windows Defender SmartScreen won't let me download ANYTHING.

Hello,

Thank you for writing to Microsoft Community Forums.

Please provide some additional information, so that we can assist you better.

Which browser you are using to download the application?

What is the complete error message appears on your computer screen when you click on download?

We can try and perform few steps and see if it helps.

Step 1: You can refer the Microsoft article related

Windows Defender SmartScreen under the section
how can I download files reported as unsafe by Windows Defender SmartScreen in Internet Explorer 10 or Microsoft Edge.

Step 2: Try to disable SmartScreen.

Press Windows + S on your keyboard.

Click on Internet Options.

When the Internet Properties window opens, go to the
Security tab and click Custom level.

Locate the Miscellaneous section. Now, locate Use
SmartScreen Filter option and set it to disable. Click OK to save changes.

You can disable SmartScreen by going to the
advanced tab and unchecking the Enable SmartScreen Filter option. After doing that, click
Apply and OK to save changes.

Restart your computer to effect the settings.

Hope it helps.

Let us know if you got the help you needed by clicking ‘Yes or No’.

Harish

Microsoft Community – Moderator

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