Microsoft Defender AV must enable the file hash computation feature.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-278661	SRG-APP-000210	WNDF-AV-000057	SV-278661r1144059_rule	2025-11-25	2

Description
This policy drives the ability to enforce Indicators of Compromise (IoC) by using file hash allow/block indicators.

ℹ️ Check
Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MpEngine >> Enable file hash computation feature is set to "Enabled"; otherwise, this is a finding. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine Criteria: If the value "EnableFileHashComputation" is REG_DWORD = 1, this is not a finding. If the value is 0, this is a finding.

ℹ️ Check

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MpEngine >> Enable file hash computation feature is set to "Enabled"; otherwise, this is a finding. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine Criteria: If the value "EnableFileHashComputation" is REG_DWORD = 1, this is not a finding. If the value is 0, this is a finding.

✔️ Fix
Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MpEngine >>Enable file hash computation feature to "Enabled". Click "OK". Click "Apply".