At a high level, Office add-in capabilities are:
Is my host protected against Microsoft Office add-ins? in Operator on each host in your environment to test if you are vulnerable.
This TTP will stage a UPX packed Microsoft Word add-in file which dumps a copy of the SAM registry hive into
C:\temp\. Once the add-in is staged Word is then executed to trigger execution of the add-in.
Microsoft has released an Attack Surface Reduction (ASR) rule to prevent Office from spawning child processes. Additionally, a GPO may be used to block unmanaged add-ins in Office applications.
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