Respond to web threats

Applies to:

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Web protection in Microsoft Defender for Endpoint lets you efficiently investigate and respond to alerts related to malicious websites and websites in your custom indicator list.

View web threat alerts

Microsoft Defender for Endpoint generates the following alerts for malicious or suspicious web activity:

  • Suspicious connection blocked by network protection: This alert is generated when an attempt to access a malicious website or a website in your custom indicator list is stopped by network protection in block mode
  • Suspicious connection detected by network protection: This alert is generated when an attempt to access a malicious website or a website in your custom indicator list is detected by network protection in audit only mode

Each alert provides the following information:

  • Device that attempted to access the blocked website
  • Application or program used to send the web request
  • Malicious URL or URL in the custom indicator list
  • Recommended actions for responders

Image of an alert related to web threat protection.

Note

To reduce the volume of alerts, Microsoft Defender for Endpoint consolidates web threat detections for the same domain on the same device each day to a single alert. Only one alert is generated and counted into the web protection report.

Inspect website details

You can dive deeper by selecting the URL or domain of the website in the alert. This opens a page about that particular URL or domain with various information, including:

  • Devices that attempted to access website

  • Incidents and alerts related to the website

  • How frequent the website was seen in events in your organization

    Image of the domain or URL entity details page.

Learn more about URL or domain entity pages

Inspect the device

You can also check the device that attempted to access a blocked URL. Selecting the name of the device on the alert page opens a page with comprehensive information about the device.

Learn more about device entity pages

Web browser and Windows notifications for end users

With web protection in Microsoft Defender for Endpoint, your end users will be prevented from visiting malicious or unwanted websites using Microsoft Edge or other browsers. Because blocking is performed by network protection, they will see a generic error from the web browser. They will also see a notification from Windows.

Image of Microsoft Edge showing a 403 error and the Windows notification. Web threat blocked on Microsoft Edge

Image of Chrome web browser showing a secure connection warning and the Windows notification. Web threat blocked on Chrome