This is an excellent tool which has many uses, today im going to look at brute forcing a remote desktop logon using ncrack.
My target is my beloved XPSP2 machine (10.50.60.115) and my attacking machine is Back|Track4.
Behind this you'll see two shell's, one with the ncrack help section displayed with the command ncrack -h and the second my working shell where i'll carry out the Brute force attack.
Ncrack has many uses for different services; this is just one example of how powerful this tool is.
As this is Brute Forcing, ncrack relies on a username and password list, these are separate files and ncrack has its own stored usually in the same place as the binaries, in my case there in /usr/local/share/ncrack/default.pwd