Windows and SMB
The NETBIOS protocol is developed by IBM in 19.. this protocol was used to share files in a network. NETBIOS should not be accessible over the internet. Later on Microsoft implemented SMB2.0 and SMB3.0. In this blogpost mainly focussed on what exactly happens when a SMB share is requested. Of course we would expect that our hashes are not simply send to an internet-facing server.