UnicodeDecodeError

[seajaysec]

When running with python3 ntlm_challenger.py 'http://autodiscover.$TARGET.com/autodiscover/ I receive the following error.

Traceback (most recent call last):
  File "ntlm_challenger.py", line 258, in <module>
    main()
  File "ntlm_challenger.py", line 251, in main
    challenge = parse_challenge(challenge_message)
  File "ntlm_challenger.py", line 151, in parse_challenge
    signature = decode_string(challenge_message[0:7]) # b'NTLMSSP\x00' --> NTLMSSP
  File "ntlm_challenger.py", line 17, in decode_string
    return byte_string.decode('UTF-8').replace('\x00', '')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcc in position 2: unexpected end of data