SMB
Server Message Block
it was designed to run on top of NetBIOS over TCP/IP (NBT) using TCP port 139 and UDP ports 137 and 138.
However, with Windows 2000, Microsoft added the option to run SMB directly over TCP/IP on port 445 without the extra NetBIOS layer.
Enumeration
Misconfigurations
SMB can be configured not to require authentication, which is often called a null session. Instead, we can log in to a system with no username or password.
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