from the doc: 'Example of "CRACK" type program for NT that could be used over the Internet to attempt logging in as Administrator using a database of passwords, until a password was found that worked. To prevent such attacks, be sure to disable SMB networking via TCP/IP protocol (using firewalls or by manipulating NT bindings) and/or periodically examine security event logs for such attacks. Also, read the security paper at http://www.somarsoft.com/security.htm.'
ntcrack.exe