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This article is designed to demonstrate how to accomplish a brute force attack, and what it looks like from the receiving end. Brute force means password guessing. This can only feasibly be accomplished with the aid of good target reconnaissance and some automated programs. While it is very easy to write your own brute force program, there are several available for free online. I find Brutus to be one of the best brute force tools. You can find it at Hoobie.net.
The first step in a brute force attack (or for that matter, any attack) is target enumeration. This is the process by which we find where and how a target is vulnerable. I use NMAP for almost all of my initial cursory scans of networks. Lets use the target of my own desktop server and run an NMAP scan to find out what we have to play with. The output from my scan follows:
nmap -sS -O 216.25.200.135
Starting nmap V. 2.30BETA17 by ( )
Interesting ports on ip-216-25-200-135.covad.dsl.fcc.net
(216.25.200.135):
Port State Service
21/tcp open ftp
25/tcp open smtp
80/tcp open http
135/tcp open loc-srv
139/tcp open netbios-ssn
443/tcp open https
445/tcp open microsoft-ds
1025/tcp open listen
1026/tcp open nterm
1031/tcp open iad2
TCP Sequence Prediction: Class=random positive increments
Difficulty=7635 (Worthy challenge)
Remote operating system guess: Windows 2000 RC1 through final release
Nmap run completed -- 1 IP address (1 host up) scanned in 1 second
Ok, so we’ve got several services to choose from on this target. The first one that catches my eye is FTP. We can use this to brute force passwords, and we can use smtp to check for user accounts. Now the fun begins. I’ll first try ftp to find if anonymous ftp is enabled (which could potentially make my task a lot easier, there are rare computers with completely open upload/download ftp servers without strong restrictions (allowing you to upload and download to the web root folder)).
C:\>ftp 216.25.200.135
Connected to ...........
next step you can read it HERE
full tutorial onely for registred users
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