For older versions of Microsoft Windows, alternative measures will need to be implemented to mitigate certain threats addressed by ASR, such as the likes of Dynamic Data Exchange (DDE) attacks.įor organisations using Microsoft Defender Antivirus, the following Group Policy setting can be implemented to enforce the above ASR rules.Ĭomputer Configuration\Policies\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Microsoft Defender Exploit Guard\Attack Surface Reduction Organisations should either implement ASR using Microsoft Defender Antivirus or use third party antivirus solutions that offer similar functionality to those provided by ASR.
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Attack Surface ReductionĪttack Surface Reduction (ASR), a security feature of Microsoft Windows 10, forms part of Microsoft Defender Exploit Guard. The following recommendations, listed in alphabetical order, should be treated as high priorities when hardening Microsoft Office deployments.
Finally, as Group Policy settings for Microsoft Office are periodically updated by Microsoft, care should be taken to ensure the latest version is always used. For cloud-based policy configurations, equivalents are available in Microsoft 365 Apps admin centre for many of the Group Policy settings. Once downloaded, the ADMX and associated ADML files can be placed in %SystemDrive%\Windows\SYSVOL\domain\Policies\PolicyDefinitions on the Domain Controller and they will be automatically loaded in the Group Policy Management Editor. The Group Policy Administrative Templates for Microsoft 365, Office 2021, Office 2019 and Office 2016 can be obtained from Microsoft. Before implementing the recommendations in this publication, testing should be undertaken to ensure the potential for unintended negative impacts on business processes is reduced as much as possible. This publication provides recommendations on hardening Microsoft 365, Office 2021, Office 2019 and Office 2016 applications. Hardening applications on workstations is an important part of reducing this risk.
This setting controls attachments that you try to open from an email message in Microsoft Outlook.Workstations are often targeted by adversaries using malicious websites, emails or removable media in an attempt to extract sensitive information.
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You can easily bypass Protected View if you need to edit a certain document or other file, but you should also know where and how to manage Protected View. When enabled, Protected View opens Office documents in read-only mode with macros and other content disabled. To protect yourself and your computer from malware and other threats, Microsoft offers a feature called Protected View. Opening Microsoft Office documents from unknown sources can present a security risk because such files can carry viruses. Image: maxkabakov, Getty Images/iStockphoto