If this attack is successful, we will see a similar result to the other two commands. Here is the command for a dictionary attack: $ hydra -L users.txt -P /usr/share/wordlists/rockyou.txt 1010.137.76 ssh If you are using Kali Linux, you can find the RockYou wordlist under /usr/share/wordlists/rockyou.txt. I am going to use the Rockyou wordlist for this example along with the users.txt file we created in the previous attack. Hydra then tests all these passwords against every user in the list. In real-world scenarios, this is what we will be using Hydra regularly for.Ī dictionary attack is where we have single/multiple usernames and we provide a password wordlist to Hydra. Let’s look at how to perform a dictionary attack. Hydra password spraying How to Perform a Dictionary Attack with Hydra l is for a single username and -L is for a list of usernames. You should also notice that we have used the flag -L instead of -l. We will get a similar result to the following output if any of the users match with the given password. $ hydra -L users.txt -p butterfly 10.10.137.76 ssh Here is how we can run a password spray attack using Hydra. Now we are going to test who has the password “butterfly”. For this example, we will create a file called users.txt with the following users: root This attack assumes we know a list of users in the system. If someone is using the password, Hydra will find the match for us. What if we know a password that someone is using, but we are not sure who it is? We can use a password spray attack to determine the username.Ī password spray attack is where we use a single password and run it against a number of users. If it works, here is what the result will look like: Hydra single username and password How to Perform a Password Spraying Attack with Hydra Here is how we can use Hydra to test the credentials for SSH: $ hydra -l molly -p butterfly 10.10.137.76 ssh Let’s assume we have a user named “molly” with a password of “butterfly” hosted at 10.10.137.76. If we have the username and password that we expect a system to have, we can use Hydra to test it. Hydra help command How to Perform a Single Username/Password Attack with Hydra This will give you the list of flags and options that you can use as a reference when working with Hydra. If you have installed Hydra, you can start with the help command like this: $ hydra -h This includes single username/password attacks, password spraying, and dictionary attacks. We will go through the common formats and options that Hydra provides for brute-forcing usernames and passwords. Personally, I don't recommend using Windows if you want to be a professional penetration tester. If you are using Windows, I would recommend using a virtual box and installing Linux. In Mac, you can find Hydra under Homebrew: $ brew install hydra On Ubuntu, you can use the apt package manager to install it: $ apt install hydra So if you are using one of them, you can start working with Hydra right away. Hydra comes pre-installed with Kali Linux and Parros OS. Always get permission from the owner before scanning / brute-forcing / exploiting a system. If you use it illegally and get into trouble, I am not responsible. Note: All my articles are for educational purposes. In this article, we will look at how Hydra works followed by a few real-world use cases. Though John and Hydra are brute-force tools, John works offline while Hydra works online. In my last article, I explained another brute-force tool called John the Ripper. Unlike in sequential brute-forcing, this reduces the time required to crack a password. This means you can have more than one connection in parallel. Hydra is also a parallelized login cracker. Hydra was first released in 2000 as a proof of concept tool that demonstrated how you can perform attacks on network logon services. Hydra was developed by the hacker group “ The Hacker’s Choice”. This includes telnet, FTP, HTTP, HTTPS, SMB, databases, and several other services. Hydra can perform rapid dictionary attacks against more than 50 protocols. Hydra is a brute-forcing tool that helps penetration testers and ethical hackers crack the passwords of network services.
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