![]() In order to use ASR, Microsoft Defender Antivirus must be configured as the primary real-time antivirus scanning engine on workstations.ĪSR offers a number of Microsoft Office-related attack surface reduction rules, these include: It is designed to combat the threat of malware exploiting legitimate functionality in Microsoft Office applications. 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. Click "Start" to begin the Detect and Repair process.Workstations are often targeted by adversaries using malicious websites, emails or removable media in an attempt to extract sensitive information.Make sure to select "Restore my shortcuts while repairing".Select "Detect and Repair." ( see screenshot).Open Excel, and go to "Help" (at the top of the Excel window, next to "File", "Edit", "View", "Insert" etc.).Running Detect and Repair for Excel 2003 or Excel 2002 (XP) A window containing a list of your installed programs should appear. Double click on "Programs and Features" (or "Add or Remove Programs" on Windows XP).The "Control Panel" window should appear. Right-click on the Windows "start" menu (bottom-left corner of your screen).Repair Office in Windows 10 or 8 Windows 7 and earlier The "Programs and Features" window containing a list of your installed programs should appear. (If you don't have the Windows 8.1 update, hover the cursor in the bottom-left corner of the screen until a small image of the "start" screen appears, then right-click on the icon.) Right-click on the Windows "start" icon (bottom-left corner of your screen) to open the "Start Context Menu".Choose from "Quick Repair" or "Online Repair". ![]() Select "Microsoft Office" (or "Microsoft Excel" if you do not have the full Office installation).The "Apps and Features" window containing a list of your installed programs should appear. The "Windows Settings" window should appear. Click on the Windows "start" icon (bottom-left corner of your screen).The instructions for this depend on which version of Windows you're using: Windows 10 Follow through the instructions until your version of Office has been updated with all the latests patches and service packs (e.g.Visit the Microsoft Update page for instructions on how to run Windows update on your particular machine (typically via "Windows Update" in the Windows Control Panel).Make sure that Excel is closed (ideally you will have rebooted your computer so that Excel hasn't even been opened yet in your current Windows session).This should be the same process as updating Windows, as Microsoft has merged the two: It's best to reboot your computer before starting an update or repair, to reduce the chances of a running program preventing files from being repaired or replaced. Updating and repairing Excel will often fix things.įollow the steps below – first update, then repair. If an Excel add-in is acting peculiarly (or not at all), it's often because Excel is broken in some way.
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