This indicates an attempt to exploit a memory-corruption vulnerability in the Microsoft Windows implementation of the Microsoft Server Message Block (SMB) 2.0 protocol.
The vulnerability is caused by an error that occurs when the vulnerable software handles a malformed NEGOTIATE PROTOCOL request. A remote attacker could exploit this vulnerability to execute arbitrary code.
Microsoft Windows Vista
Microsoft Windows Server 2008
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor's web site for the suggested workaround: