Title

Force encrypted macros to be scanned in open XML documents must be determined and configured. (Cat II impact)

Discussion

When an Office Open XML document (Word, Excel, and PowerPoint) is rights-managed, or password-protected, any macros embedded in the document are encrypted along with the rest of the contents. By default, these encrypted macros will be disabled unless they are scanned by antivirus software immediately before being loaded. If this default configuration is modified, Office products will not require encrypted macros to be scanned before loading. They will be handled as specified by the Office System macro security settings, which can cause macro viruses to load undetected and lead to data loss or reduced application functionality.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Scan encrypted macros in Excel Open XML workbooks” must be “Enabled: Scan encrypted macros (default)”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value ExcelBypassEncryptedMacroScan is REG_DWORD = 0, this is not a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Scan encrypted macros in Excel Open XML workbooks” to “Enabled: Scan encrypted macros (default)”.

Additional Identifiers

Rule ID: SV-33441r1_rule

Vulnerability ID: V-17473

Group Title: DTOO142 - Force Scan Encr. Macros in open XML

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.