This indicates an attack attempt to exploit a remote Code Execution vulnerability in Microsoft Outlook email client.
The vulnerability is due to a error in the application when parsing the contents of an rule file. A remote attacker could exploit this to execute arbitrary code execution within the context of the application, via a crafted rule file.
Microsoft Outlook 2013 RT Service Pack 1
Microsoft Outlook 2010 Service Pack 2 (32-bit editions)
Microsoft Outlook 2010 Service Pack 2 (64-bit editions)
Microsoft Outlook 2016 (32-bit edition)
Microsoft Outlook 2016 (64-bit edition)
Microsoft Outlook 2013 Service Pack 1 (32-bit editions)
Microsoft Outlook 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Office 365 ProPlus for 32-bit Systems
Office 365 ProPlus for 64-bit Systems
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.