THC Hydra stands for “The hackers choice” Hydra. This a hacking tool, it is a very powerful password cracking tool. I think you may come across the john the ripper tool, even this tool is used for password cracking. The difference between John the ripper and the hacker choice hydra is John the ripper works offline and The hackers choice. # hydra -l user.txt -p pass.txt 192.168.1.108 ftp -d. Attempt reverse login # hydra -l user.txt -p pass.txt 192.168.1.108 ftp -e nsr. Attack a specific port instead of the default Due to security concerns a network administrator can change the port number of a service on another port Hydra performs a brute force attack on the default service port. Feb 12, 2013 THC-Hydra is a software used to crack login systems of different services such as HTTP, FTP, TELNET, IMAP, SMB, SSH, etc. In a very easy and fast way. Its latest version (7.4.2) was released last 7th January. This tool has earned a great reputation thanks to its console mode both in Linux and Windows systems (also offering Linux users the. Jun 18, 2011 THC-HYDRA v6.4 - Fast network logon cracker THC-HYDRA is a very fast network logon cracker which support many different services. This tool is a proof of concept code, to give researchers and security consultants the possibility to show how easy it would be to gain unauthorized access from remote to a system.
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(Please note this post was published last 4th february 2013 in the Spanish version of Security Art Work. See original post: THC-Hydra: Obtener credenciales de usuario por fuerza bruta)
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THC-Hydra is a software used to crack login systems of different services such as HTTP, FTP, TELNET, IMAP, SMB, SSH, etc. in a very easy and fast way. Its latest version (7.4.2) was released last 7th January.
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This tool has earned a great reputation thanks to its console mode both in Linux and Windows systems (also offering Linux users the option to use a graphical interface) and the possibility to execute the attacks using threads, giving the user the option to choose the number of threads used to perform the attack.
To carry out the attacks, THC-Hydra is based on the use of dictionaries that contain all the possible options the user may want to try. These are completely necessary for the execution of the program to keep trying different possibilities and to obtain the user credentials.
Its basic version from the command line is very simple: just set the host we want to attack, the type of service, the files that contain the user and password values, and the characteristics of the protocol (when necessary).
For instance, to attack an FTP service, you need: the host to be analyzed, the type of service (ftp), the file containing the list of users (option -L) and the file containing the password list (option -P), what results in:
A more specific example could be an attack against the HTTP login of a website that sends the data using the POST method. In this case in addition to the above information, the user will need to specify the exact URL of the login form, the name of the user and password values in the web form, and the string of HTML code to indicate whether it was successful or not (based on the response from the server). For this example, the command would be as follows:
Where the exact url of the form is “login.php“, the parameter name of the form containing the user is “var_user“, the password is “var_pass” and the string that indicates that the login is correct is “Login successful“.
In the next picture we see the application output with the different users and passwords that the tool finds in the login form HTTP using POST method:
It should be noted that these are not the only options that can be set in the tool. It is possible to specify the number of threads used (option -t), carry out the attack with a given user (option -l) or a specific password (option -p), add cookies (C=cookie_value), add headers (H=header value), etc. It is strongly recommended to analyze the different options shown in the program help (option -h), the different examples and help links offered on their website http://www.thc.org/thc-hydra/.
Finally, thanks to tools like THC-Hydra, we can see how easy it can be to get a list of users using passwords too obvious and/or common. This once again demonstrates the importance of using strong passwords for those services we use.