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The SMB Protocol is a standard, generally secure system that creates a connection between client and server by sending responses and requests.

These data packets can contain malware such as a trojan, ransomware or similar dangerous program.

This dupes a Windows machine that has not been patched against the vulnerability into allowing illegitimate data packets into the legitimate network.

EternalBlue is a Windows exploit created by the US National Security Agency (NSA) and used in the 2017 WannaCry ransomware attack.ĮternalBlue exploits a vulnerability in the Microsoft implementation of the Server Message Block (SMB) Protocol.