John the ripper using rockyou

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John the ripper using rockyou

John the Ripper (JtR) is one of the hacking tools the Varonis IR Team used in the first Live Cyber Attack demo, and one of the most popular password cracking programs out there. In this blog post, we are going to dive into John the Ripper, show you how it works, and explain why it's important. Notes about hacking: Hacking is a pursuit of knowledge about systems, design, and humans. In this case, we are talking about software and operating systems. "This really opened my eyes to AD security in a way defensive work never did." Hacking is not necessarily criminal, although it can be a tool used for bad intentions. We advocate for ethical hacking. Stay in the light side of the Force. How Does John the Ripper Work? JtR supports several common encryption technologies out-of-the-box for UNIX and Windows-based systems. (ed. Mac is UNIX based). JtR autodetects the encryption on the hashed data and compares it against a large plain-text file that contains popular passwords, hashing each password, and then stopping it when it finds a match. Simple. In our amazing Live Cyber Attack demo, the Varonis IR team demonstrates how to steal a hashed password, use JtR to find the true password, and use it to log into an administrative account. That is a very common use case for JtR! JtR also includes its own wordlists of common passwords for 20+ languages. These wordlists provide JtR with thousands of possible passwords from which it can generate the corresponding hash values to make a high-value guess of the target password. Since most people choose easy-to-remember passwords, JtR is often very effective even with its out-of-the-box wordlists of passwords. JtR is included in the pentesting versions of Kali Linux. What is John the Ripper Used for? JtR is primarily a password cracker used during pentesting exercises that can help IT staff spot weak passwords and poor password policies. Here is the list of encryption technologies found in JtR: UNIX crypt(3) Traditional DES-based "bigcrypt" BSDI extended DES-based FreeBSD MD5-based (linux and Cisco IOS) OpenBSD Blowfish-based Kerberos/AFS Windows LM (DES-based) DES-based tripcodes SHA-crypt hashes (newer versions of Fedora and Ubuntu) SHA-crypt and SUNMD5 hashes (Solaris) That's the "official" list. JtR is open-source, so if your encryption of choice isn't on the list do some digging. Someone might have already written an extension for it. How to Download John the Ripper JtR is an open-source project, so you can either download and compile the source on your own, download the executable binaries, or find it as part of a penetration testing package. The official website for John the Ripper is on Openwall. You can grab the source code and binaries there, and you can join the GitHub to contribute to the project. JtR is available on Kali Linux as part of their password cracking metapackages. Tutorials for Using John the Ripper We are going to go over several of the basic commands that you need to know to start using John the Ripper. To get started all you need is a file that contains a hash value to decrypt. If you ever need to see a list of commands in JtR, run this command: .\john.exe Cracking Passwords John the Ripper's primary modes to crack passwords are single crack mode, wordlist mode, and incremental. The single crack mode is the fastest and best mode if you have a full password file to crack. Wordlist mode compares the hash to a known list of potential password matches. Incremental mode is the most powerful and possibly won't complete. This is your classic brute force mode that tries every possible character combination until you have a possible result. The easiest way to try cracking a password is to let JtR go through a series of common cracking modes. This command below tells JtR to try "simple" mode, then the default wordlists containing likely passwords, and then "incremental" mode. .\john.exe passwordfile You can also download different wordlists from the Internet, and you can create your own new wordlists for JtR to use with the ?wordlist parameter. .\john.exe passwordfile ?wordlist="wordlist.txt" If you want to specify a cracking mode use the exact parameter for the mode. .\john.exe --single passwordfile .\john.exe --incremental passwordfile Word Mangling Rules Mangling is a preprocessor in JtR that optimizes the wordlist to make the cracking process faster. Use the ?rules parameter to set the mangling rules. .\john.exe --wordlist="wordlist.txt" --rules --passwordfile Viewing Your Output When you want to see the list of passwords that you have cracked, use the ?show parameter. .\john.exe ?show passwordfile If your cracked password list is long, you can filter the list with additional parameters. You can also redirect the output using basic redirection in your shell. For example, if you want to see if you cracked any root users (UID=0) use the ?users parameter. .\john.exe --show --users=0 passwordfile Or if you want to show users from privileged groups use ?groups. .\john.exe ?-show ?-groups=0,1 passwordfile Below is the JtR command from our Live Cyber Attack Webinar. In this scenario, our hacker used kerberoast to steal a Kerberos ticket granting ticket(TGT) containing the hash to be cracked, which was saved in a file called ticket.txt. In our case, the wordlist used is the classic rockyou password file from Kali Linux, and the command was set to report progress every 3 seconds. .\john.exe "--format=krb5tgs" "ticket.txt" "--wordlist="rockyou.txt" "--progress-every=3" If you want to see some cool pentesting and defense tactics using Varonis, check out the Live Cyber Attack Webinars! Pick any time that works for you! I am trying to learn how john works. I made a password-protected rar archive, and written that password inside a file named pass.txt. I used rar2john to build the hash: # more test.hash test.rar:$rar3$*0*c15839e058bb28a3*9d55925bdd33618f3e02f8b7004faab8 However, when I try to run john, I get an error message: # john --format=rar --wordlist=pass.txt test.rar Warning: invalid UTF-8 seen reading test.rar Using default input encoding: UTF-8 No password hashes loaded (see FAQ) I tried with and without the --format and --wordlist options. I read John The Ripper's FAQ but nothing helped me. I saw that the format rar was supported on Pentest Monkey. I even tried the example they gave, but john keeps telling me the same thing. Any idea? The error I'm getting is this: Using default input encoding: UTF-8 No password hashes loaded (see FAQ) I'm not sure if there's something wrong with using this directory. Must I use a different user account than root? Must that other user account have root or bash authority, I have no idea about most of this stuff. I'm sort of just following the instructions on the LAMPSecurity CTF exercise 7 PDF. The password file I'm using was from a dump off of a CTF8 server's website is rockyou.txt The command I'm using is this: john --wordlist=/usr/share/wordlists/rockyou.txt ?-format=raw-MD5 /root/hashes.txt And yes, both files are in those correct directories. rockyou.txt is the default common-passwords list that comes with Kali's default version of John the Ripper. I had to actually pull the rockyou.txt file out of the rockyou.txt.gz compressed file, and I merely left it in that same folder. I have tried moving both files into the same directory, /usr/share/wordlists. I have even tried to use the unshadow command and point the command to create a myhashes.txt. The myhashes.txt didn't work at that point either. Kali Linux 2016.2 kali-rolling. BACKGROUND: I'm doing the LAMPSecurity CTF Exercise 7. I'm stuck on page 49 of the PDF instructions for hours doing internet searches and not being sure what to do. It has us using a CTF8 linux server and the instructions are for backtrack, but I'm using Kali Linux instead. It has us run a version of the server before it's been updated and patched so that it has plenty of vulnerabilities. Using a vmware, I set the network cards to the host-only private network on both Kali linux and CTF8. I was able to exploit the vulnerability as per instructions in the comment box in order to obtain a password hash dump file named hashes.txt. I'm not really sure what to do next. I'm hoping someone else has done this exercise and knows what they did to solve it, or if you have more experience with Linux and can intuit what I'm doing wrong, that would be great as well. UPDATE: Thanks a lot for your help, HAlmussajjen. HAlmussajjen helped me solve this in a chat. All of the hashes in the file were listed as `username.number`. "Number" of course meaning the actual hash value. Apparently, all stupid me needed to do was to delete the "username." before each hash number. Boy, was that an ordeal just for something simple. cracking ssh With John, we can crack not only simple password hashes but also SSH Keys. It is pretty simple, so let's get started. #copying the SSH Key that we have to crack cp ~/.ssh/id_rsa id_rsa We will need a script, ssh2john.py. It comes along with Kali so, you don't really need to download it. #finding the file updatedb locate ssh2john.py cp $(locate ssh2john.py) . #now, we will create a hash using it python ssh2john.py id_rsa > id_rsa.hash Now, let's find and copy rockyou.txt.gz, our wordlist. locate rockyou.txt cp $(locate rockyou.txt) . #now, unzip the file gunzip rockyou.txt.gz Finally, let's use john and rockyou.txt to try and crack the SSH Key. john id_rsa.hash -wordlist=rockyou.txt Congratulations! Have fun SSHing!

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