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A Detailed Guide on Hydra

Hello! Pentesters, this article is about a brute-forcing tool Hydra. Hydra is one of the favourite tools of security researchers and consultants. Being an excellent tool to perform brute force attacks, it provides various other options which can make your attack more intense and easier to gain unauthorised access to the system remotely. In this article, I have discussed each option available in hydra to make brute force attacks in various scenarios.

Hydra – a very fast network logon cracker which supports many different services. It is a parallelized login cracker which supports numerous protocols to attack. New modules are easy to add, besides that, it is flexible and very fast. This tool gives researchers and security consultants the possibility to show how easy it would be to gain unauthorized access from a remote to a system.

Currently this tool supports: adam6500, afp, asterisk, cisco, cisco-enable, cvs, firebird, ftp, ftps, http[s]-{head|get|post}, http[s]-{get|post}-form, http-proxy, http-proxy-urlenum, icq, imap[s], irc, ldap2[s], ldap3[-{cram|digest}md5][s], mssql mysql(v4), mysql5, ncp, nntp, oracle, oracle-listener, oracle-sid, pcanywhere, pcnfs, pop3[s], postgres, rdp, radmin2, redis, rexec, rlogin, rpcap, rsh, rtsp, s7-300, sapr3, sip, smb, smtp[s], smtp-enum, snmp, socks5, ssh, sshkey, svn, teamspeak, telnet[s], vmauthd, vnc, xmpp

For most protocols, SSL is supported (e.g., https-get, ftp-SSL, etc.).  If not, all necessary libraries are found during compile time, your available services will be less.  Type “hydra” to see what is available.

If you have a correct username but want to login without knowing the password, so you can use a list of passwords and brute force on passwords on the host for ftp service.

Here -l option is for username -P for password lists and host ip address for ftp service.

For login ignite password 123 made success.

You may have a valid password but no idea what username to use. Assume you have a password for specific ftp login. You can brute force the field with correct username wordlists to find the correct. You can use the -L option to specify user wordlists and the -p option to specify a specific password.

Here, our wordlist is users.txt for which -L option is used, and password is 123 and for that   -p option is used over ftp.

Now if you don’t have either of username or password, for that you can use a brute force attack on both the parameters username and password with a wordlist of both and you can use -P and -U parameters for that.

Users.txt is wordlist for username and pass.txt is wordlist for password and the attack has displayed valid credentials ignite and 123 for the host.

-V option is used for verbose mode, where it will show the login+pass combination for each attempt. Here, I have two wordlists users.txt and pass.txt so the brute force attack was making combinations of each login+password and verbose mode showed all the attempts.

Here the users.txt has 5 usernames and pass.txt has 7 passwords so the number of attempts was 5*7= 35 as shown in the screenshot.

Now is the -d option used to enable debug mode. It shows the complete detail of the attack with wait time, conwait, socket, PID, RECV  

-d option enabled debug mode which, as shown displayed complete detail of the attack.

Hydra has an option -e which will check 3 more passwords while brute-forcing. [n] for null, [s] for same i.e., as same as the username and [r] for reverse i.e., the reverse of username. As shown in the screenshot, while brute-forcing the password field, it will first check with the null option then the same option and after that reverse. And then the list which I have provided.

I have enabled verbose mode also so that we can get detailed information about the attempts made while brute-forcing.   

This tool gives you an option to save the result into the disk. Basically for record maintenance, better readability and future preferences we can save the output of the brute force attack into a file by using the -o parameter.

I tried to use this option and got success using the above command where the output is stored in the result.txt file.

I have used this option to store result in json file format also, this type is a unique thing provided by hydra.

It may happen sometimes, that attack gets halted/paused accidentally due to some unexpected behaviour by hydra. So, hydra has solved this problem by including the -R option so that you can resume the attack from that position rather than starting from the beginning.

First, I started the attack using the first command, then halted the attack by pressing CTRL + C and then by using the second command I resumed the attack. 

To generate passwords using various set of characters, you can use -x option. It is used as -x  min:max:charset  where,

Min: specifies minimum number of characters in a password.

Max: specifies the maximum number of characters in password.

Charset: charset can contain 1 for numbers, a for lowercase and A for uppercase characters. Any other character which is added is put to the list.

Let’s consider as example: 1:2:a1%.

The generated passwords will be of length 1 to 2 and contain lowercase letters, numbers and/or percent signs and dots.

So, here minimum length of password is 1 and the max length is 3 which will contain numbers and for password 123 it showed success.

To make you understand better I have used -V mode and it has displayed results in detail.

Network admins sometimes change the default port number of some services for security reasons. In the previous commands hydra was making brute force attack on ftp service by just mentioning the service name rather than port, but as mentioned earlier default port gets changed at this time hydra will help you with the -s option. If the service is on a different default port, define it using the -s option.

So to perform, first I tried running a nmap scan at the host. And the screenshot shows all open ports where ssh is at the 2222 port. So post that I tried executing the hydra command with -s parameter and port number.

I have brute-forced on ssh service mentioning the port number, 2222.

Here it found valid entries with user ignite and password 123.

As earlier I performed a brute force attack using password file pass.txt and username file users.txt on a single host i.e., 191.168.1.141. But if there are multiple hosts, for that you can use -M with the help of which brute force is happening at multiple hosts.

First, I have created a new file hosts.txt which contains all the hosts. Then the result is showing 2 valid hosts, username and password with success.

Now in the above command, I have used the -M option for multiple hosts so, it is very time-consuming to display all the attempts taking place while the attack, for that medusa, has provided -F option such that the attack will exit after the first found login/password pair for any host.

This tool gives you a unique parameter -C for using combo entries. First, you need to create a file which has data in the colon-separated “login:pass” format,  and then you can use -C option mentioning the file name and perform a brute force attack instead of using  -L/-P options separately. In this way, the attack can be faster and gives you desired result in lesser time.

So, I have created a userpass.txt file using cat command and entered details in “login:pass” format. Then I used -C option in the hydra command to start the attack.

If you want to test multiple logins concurrently, for that you can use -t option by mentioning the number and hence hydra will brute force concurrently.

As shown in the screenshot, three attempts are made concurrently, three passwords are concurrently checking with user ignite at host 192.168.1.141, as you can observe child changes 0, 1,2 that means it is concurrently making three attempts and printed 3 of them simultaneously.

The hydra form can be used to carry out a brute force attack on simple web-based login forms that requires username and password variables either by GET or POST request. For testing I used dvwa (damn vulnerable web application) which has login page. This page uses POST method as I am sending some data.

Here I have given the username admin and provided file for passwords and used http-post-form module to perform brute force attack on 192.168.1.150 host.

So, for password: password it gave success and bypassed the login page. Now I had performed brute force on username and password field mentioned having security level as “low”. And by using cookie editor plugin I found out the cookie PHPSESSID and used its value in the command.

I had viewed page source and from that I found out that page uses GET method, and so http-GET-form module as mentioned in above command.

As in the screenshot, the command is successfully executed, and I got the correct username and password.

As discussed earlier in the introduction all the supported services by hydra, if you want to check once just type hydra -h and you will get list of services supported by hydra. So, to get the detailed information about the usage hydra provides -U option.

Here http-get-form is one of the services supported by hydra and -U option helped to get detailed information.

While performing an attack on ftp connection, you just mention the service name along with appropriate options, but if the host has ftp port open and ftp is secured, so if you use

This command will not execute properly and hence 0 valid passwords were found. So in order to perform an attack on a secured ftp connection, then run this command.

And this command worked well and showed 1 valid password found.

This is one way to attack secured ftp, hydra provides one more way to attack secured service.

The first did not work as the host 192.168.1.141 has secured ftp, but the second, worked and showed us a valid password found. In this way, you can perform a brute force attacks on hosts which have secured services open.

Now let’s discuss how hydra attacks on hosts having proxy enabled. I first tried to same command with -l -p parameters on host 192.168.1.141 on ftp service and found that no password was found. Hence, I started an nmap scan for the host and found list of services and ports open. So, at port 1080 a proxy “socks5” was set without any authentication.

Hydra provides two different ways for proxy support. I have tried both the ways. Use screenshots for better understanding. Let’s discuss the first way

Environment Variable

To enable proxy I used this command

And then used the following command and got 1 valid password

Proxychains

I have opened the /etc/proxychains4.conf and added the proxy details with host and port. And then with the help of proxychains brute force is performed

cat /etc/proxychains4.conf

I got the desired password 123 for the host. In the above attack, there was not any authentication enabled. Now I tried on a proxy that has authentication enabled.

Proxychains

I tried to brute force the target using proxychains but it was denied because authentication was enabled on the proxy.

So, I added the username and password in /etc/proxychains4.conf file

Just observe the screenshot for better understanding. Then with the help of proxychains, I started attacking using the below command

Hence, after execution of this command, a valid password was found for the host having proxy enabled.    

Environment Variable

Here “raj” is the username, “1234” is password for the proxy and “192.168.1.141” is the host and “1080” is the port on which the proxy is enabled. After that, I used the command

And for this, it showed a valid password for the host 192.168.1.141 

Note: For setting up the proxy I took reference from https://www.hackingarticles.in/penetration-testing-lab-setup-microsocks/

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