This indicates an attack attempt to exploit an Information Disclosure vulnerability in Microsoft Internet Explorer.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted HTML file. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious web-page and gain sensitive information from vulnerable systems.
Internet Explorer 11
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.