This indicates an attack attempt against an Information Disclosure vulnerability in Microsoft Windows SMB server.
The vulnerability is due to insufficient input validation in the application when handling a crafted SMB request. A remote attacker can exploit this to gain unauthorized access to sensitive information via the crafted SMB request. This vulnerability has been incorporated into various tools and is used for scanning vulnerable targets that might be affected by the vulnerabilities related to Shadow Brokers leak.
Microsoft Windows 7
Microsoft Windows 8.1
Microsoft Windows RT 8.1
Microsoft Windows 10
Microsoft Windows Vista
Microsoft Windows Server 2016
Microsoft Windows Server 2012 R2 (Server Core)
Microsoft Windows Server 2008 R2
Microsoft Windows Server 2008
Microsoft Windows Server 2012
Microsoft Windows Server 2012 R2
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.