What is Smbtouch and what vulnerabilities does it detect?

Smbtouch is a tool within the NSA's leaked FuzzBunch framework that detects SMB and NBT remote privilege escalation vulnerabilities on target hosts. It specifically tests for ETERNALBLUE, ETERNALCHAMPION, ETERNALROMANCE, and ETERNALSYNERGY, which are among the most harmful exploits for intranet workgroup environments.