It's a basic ssh botnet which can brute force system passwords with provided list. Only for educational purposes :)
goto the dir containing the script & invoke it like: $ python sshBotnet.py -H <host_addr> -u -F <passwd_file>
given the paswd_file is in the current dir, this script would guess the pass for all the words inside the file. So, an attempt would be as good as the passFile provided