Microsoft Windows Defender Antivirus STIG: WNDF-AV-000039

Check: WNDF-AV-000039 (in versions v2 r2 through v1 r2)

Title

Windows Defender AV must be configured to prevent user and apps from accessing dangerous websites. (Cat II impact)

Discussion

Enable Windows Defender Exploit Guard network protection to prevent employees from using any application to access dangerous domains that may host phishing scams exploit-hosting sites and other malicious content on the Internet.

Check Content

This setting is applicable starting with v1709 of Windows 10, it is NA for prior versions. Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Windows Defender Exploit Guard -> Network Protection -> "Prevent users and apps from accessing dangerous websites" is set to "Enabled” and “Block" selected in the drop down box. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\Network Protection Criteria: If the value "EnableNetworkProtection" is REG_DWORD = 1, this is not a finding.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Windows Defender Exploit Guard -> Network Protection -> "Prevent users and apps from accessing dangerous websites" to "Enabled” and select “Block" in the drop down box.

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.
Number Definition
CCI-001170

The information system prevents the automatic execution of mobile code in organization-defined software applications.

Controls

Controls tied to check. These are derived from the CCIs shown above.
Number Title
SC-18 (4)

Prevent Automatic Execution