The list of domains for which Microsoft Defender SmartScreen will not trigger warnings must be allowlisted if used.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-235722	EDGE-00-000004	SV-235722r960852_rule		Low

Description
Configure the list of Microsoft Defender SmartScreen trusted domains. This means Microsoft Defender SmartScreen will not check for potentially malicious resources, such as phishing software and other malware, if the source URLs match these domains. The Microsoft Defender SmartScreen download protection service will not check downloads hosted on these domains. If this policy is enabled, Microsoft Defender SmartScreen trusts these domains. If the policy is disabled or not set, default Microsoft Defender SmartScreen protection is applied to all resources.

Description

Configure the list of Microsoft Defender SmartScreen trusted domains. This means Microsoft Defender SmartScreen will not check for potentially malicious resources, such as phishing software and other malware, if the source URLs match these domains. The Microsoft Defender SmartScreen download protection service will not check downloads hosted on these domains. If this policy is enabled, Microsoft Defender SmartScreen trusts these domains. If the policy is disabled or not set, default Microsoft Defender SmartScreen protection is applied to all resources.

STIG	Date
Microsoft Edge Security Technical Implementation Guide	2024-06-10

Details

Check Text ( C-38941r863222_chk )
If this machine is on SIPRNet, this is Not Applicable. This requirement for "SmartScreenAllowListDomains" is not required; this is optional. The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure the list of domains for which Microsoft Defender SmartScreen won't trigger warnings" may be set to "allow" for allowlisted domains. Use the Windows Registry Editor to navigate to the following key: HKLM\SOFTWARE\Policies\Microsoft\Edge SmartScreenAllowListDomains may be set as follows: HKLM\SOFTWARE\Policies\Microsoft\Edge\SmartScreenAllowListDomains\1 = mydomain.com HKLM\SOFTWARE\Policies\Microsoft\Edge\SmartScreenAllowListDomains\2 = myagency.mil If configured, the list of domains for which Microsoft Defender SmartScreen will not trigger warnings may be allowlisted.

Check Text ( C-38941r863222_chk )

If this machine is on SIPRNet, this is Not Applicable.

This requirement for "SmartScreenAllowListDomains" is not required; this is optional.

The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure the list of domains for which Microsoft Defender SmartScreen won't trigger warnings" may be set to "allow" for allowlisted domains.

Use the Windows Registry Editor to navigate to the following key:
HKLM\SOFTWARE\Policies\Microsoft\Edge

SmartScreenAllowListDomains may be set as follows:
HKLM\SOFTWARE\Policies\Microsoft\Edge\SmartScreenAllowListDomains\1 = mydomain.com
HKLM\SOFTWARE\Policies\Microsoft\Edge\SmartScreenAllowListDomains\2 = myagency.mil

If configured, the list of domains for which Microsoft Defender SmartScreen will not trigger warnings may be allowlisted.

Fix Text (F-38904r863223_fix)
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Configure the list of domains for which Microsoft Defender SmartScreen will not trigger warnings" may be set to "allow" for allowlisted domains.