This indicates an attack attempt to exploit a Privilege Elevation vulnerability in Microsoft Windows.
The vulnerability is due to an error in Windows Desktop Bridge when handling virtual registry. A remote attacker may be able to exploit this to escalate their privileges on vulnerable systems.
Windows Server 2016
Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows Server 2016 (Server Core installation)
Windows 10 Version 1703 for 32-bit Systems
Windows 10 Version 1703 for x64-based Systems
Privilege Escalation: Remote attackers can leverage their privileges on vulnerable systems.
Apply the most recent upgrade or patch from the vendor.