Ncrack's features include a very flexible interface granting the user full control of network operations, allowing for very sophisticated bruteforcing attacks, timing templates for ease of use, runtime interaction similar to Nmap's and many more.
Ncrack was started as a "Google Summer of Code" Project in 2009. While it is already useful for some purposes, it is still unfinished, alpha quality software. It is released as a standalone tool and can be downloaded from the section below. Be sure to read the Ncrack man page to fully understand Ncrack usage.
USE THIS TOOL FOR LEGAL PURPOSES ONLY!Installation:
Download Ncrack - here
Compile and install Ncrack using following command
tar -xzf ncrack-0.2ALPHA.tar.gz
cd ncrack-0.2ALPHA
./configure
make
su root
make install
Using Ncrack:
The only Ncrack arguments used in this example are the two target IP addresses along with the the corresponding ports for each of them. The two example ports 21 and 22 are automatically resolved to the default services listening on them: ftp and ssh.
The only Ncrack arguments used in this example are the two target IP addresses along with the the corresponding ports for each of them. The two example ports 21 and 22 are automatically resolved to the default services listening on them: ftp and ssh.
$ ncrack 10.0.0.130:21 192.168.1.2:22
Discovered credentials for ftp on 10.0.0.130 21/tcp:
10.0.0.130 21/tcp ftp: admin hello1
Discovered credentials for ssh on 192.168.1.2 22/tcp:
192.168.1.2 22/tcp ssh: guest 12345
192.168.1.2 22/tcp ssh: admin money$
Ncrack done: 2 services scanned in 156.03 seconds.
Ncrack finished.
Ncrack can also be extensively fine-tuned for special cases, though the default parameters are generic enough to cover almost every situation. It is built on a modular architecture that allows for easy extension to support additional protocols. check man pages for more options.
source:http://linuxpoison.blogspot.com/2010/07/13578167753613.html