This indicates an attack attempt to exploit a Memory Corruption Vulnerability in Microsoft Office 365 ProPlus.
The vulnerability is due to an improper handling of objects in the application. A remote attacker could exploit this vulnerability by enticing a user to open a maliciously crafted document. Successful exploitation would result in execution of arbitrary attacker code in the context of the logged-in user.
Microsoft Excel 2010 Service Pack 2
Microsoft Excel 2013 RT Service Pack 1
Microsoft Excel 2013 Service Pack 1
Microsoft Excel 2016
Microsoft Excel 2019
Microsoft Office 365 ProPlus .
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.