Windows Defender AV must be configured to turn on e-mail scanning.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75239	WNDF-AV-000027	SV-89919r2_rule		Medium

Description
This policy setting allows you to configure e-mail scanning. When e-mail scanning is enabled the engine will parse the mailbox and mail files according to their specific format in order to analyze the mail bodies and attachments. Several e-mail formats are currently supported for example: pst (Outlook) dbx mbx mime (Outlook Express) binhex (Mac). If you enable this setting e-mail scanning will be enabled. If you disable or do not configure this setting e-mail scanning will be disabled.

Description

This policy setting allows you to configure e-mail scanning. When e-mail scanning is enabled the engine will parse the mailbox and mail files according to their specific format in order to analyze the mail bodies and attachments. Several e-mail formats are currently supported for example: pst (Outlook) dbx mbx mime (Outlook Express) binhex (Mac). If you enable this setting e-mail scanning will be enabled. If you disable or do not configure this setting e-mail scanning will be disabled.

STIG	Date
MS Windows Defender Antivirus Security Technical Implementation Guide	2019-06-24

Details

Check Text ( C-75031r2_chk )
Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Scan -> "Turn on e-mail scanning" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\Scan Criteria: If the value "DisableEmailScanning" is REG_DWORD = 0, this is not a finding.

Check Text ( C-75031r2_chk )

Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Scan -> "Turn on e-mail scanning" is set to "Enabled".

Procedure: Use the Windows Registry Editor to navigate to the following key:
HKLM\Software\Policies\Microsoft\Windows Defender\Scan

Criteria: If the value "DisableEmailScanning" is REG_DWORD = 0, this is not a finding.

Fix Text (F-81849r2_fix)
Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Scan -> "Turn on e-mail scanning" to "Enabled".