SV-223333r961092: Scan of encrypted macros in Excel Open XML workbooks must be enabled. | Microsoft Office 365 ProPlus STIG SCAP Benchmark

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Assessment Title

Rule Text

Scan of encrypted macros in Excel Open XML workbooks must be enabled.

Description

Discussion Text

This policy setting controls whether encrypted macros in Open XML workbooks be are required to be scanned with anti-virus software before being opened. If you enable this policy setting, you may choose one of these options: - Scan encrypted macros: encrypted macros are disabled unless anti-virus software is installed. Encrypted macros are scanned by your anti-virus software when you attempt to open an encrypted workbook that contains macros. - Scan if anti-virus software available: if anti-virus software is installed, scan the encrypted macros first before allowing them to load. If anti-virus software is not available, allow encrypted macros to load. - Load macros without scanning: do not check for anti-virus software and allow macros to be loaded in an encrypted file. If you disable or do not configure this policy setting, the behavior will be similar to the "Scan encrypted macros" option.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001170SV-108845V-99741

References

DPMS Target Microsoft Office 365 ProPlus DISA DPMS Target Microsoft Office 365 ProPlus 4099

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_office_365_proplus target this check assesses.

# OVAL Definition: oval:mil.disa.stig.office365:def:223333
if (Test-Path "HKCU:\Software\Policies\Microsoft\office\16.0\excel\security\excelbypassencryptedmacroscan" -and (Get-ItemProperty -Path "HKCU:\Software\Policies\Microsoft\office\16.0\excel\security\excelbypassencryptedmacroscan").excelbypassencryptedmacroscan -eq 0) {Write-Output "PASS"; Exit 0} else {Write-Output "FAIL"; Exit 1}

Remediation

Set policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Scan encrypted macros in Excel Open XML workbooks to "Scan encrypted macros (default)".