EternalBlue, EternalSynergy, EternalRomance, and EternalChampion are computer exploits developed by the Equation Group impacting many versions of Windows via the SMB protocol.
These are outlined in MS17-010, CVE-2017-0143, CVE-2017-0144, CVE-2017-0145, CVE-2017-0146, CVE-2017-0147, and CVE-2017-0148.
https://en.wikipedia.org/wiki/EternalBlue