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.
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Jan 16, 2019 Recent PlayStation Classic News: PPSSPP (PSP emulator) port released, tool to directly boot into RetroArch released and BleemSync to get exFAT and NTFS support! – Wololo.net Posted on11:47 pm - Jan 20, 2019 grab the PPSSPP emulator, which is provided as a RetroArch core, simply head over to this link and download the ZIP file provided. This tutorial is to help you with PPSSPP for Windows. PPSSPP is the #1 emulator for the Sony PSP! It has the usual bundle of features we expect from an emulator. Its game compatibility is very good. PPSSPP's drawback is that it's too good of an emulator - it's resource demanding! This is a Guide to setup your gamepad controller to work in the PPSSPP emulator if it doesn't work correctly automatically, and the normal PPSSPP controller settings (run a ROM, press ESC, go to Settings Controls Control mapping) also doesn't work as it should.
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.
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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:
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.
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.
If you want to specify a cracking mode use the exact parameter for the mode.
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.
Viewing Your Output
When you want to see the list of passwords that you have cracked, use the –show parameter.
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.
Or if you want to show users from privileged groups use –groups.
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.
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!
Obtaining GNU PSPP
PSPP is GNU software. You can obtain it the same way as with anyGNU software. PSPP should work on most modern computers and most operatingsystems. Systems which have been known to work include:GNU/Hurd,GNU/Linux,Darwin (Mac OS X), OpenBSD,NetBSD, FreeBSD, and Windows.
Binaries
GNU Linux
We do not distribute precompiled binaries of PSPP. Computers come with so many different archtectures, kernels, operating systems that it would not be feasible for us to do so. However most modern operating systems come with PSPP pre-packaged. To install it, you simply type apt-get install pspp
in the case of Debian derived systems; or yum install pspp
in the case of Red Hat derived systems.
Windows
Harry Thijssen provides installers or all downloadable files. The windows version is build as cross compile build on openSUSE. There is also a nightly build with development versions.
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MacOS
There are three ways to install PSPP on MacOS.
- The Application bundle provides the gui version via a normal installer. If you do not know what XCode is - go for this one.
- MacPorts. Run
port install pspp-devel
to get the latest and most featureful version of PSPP orport install pspp
to get an older but possibly better tested version (more information). - Homebrew. The PSPP brew tap also includes a description how to install the stable or the development version of PSPP.
Please note: Because the PSPP developers have not prepared these binaries, we cannot in general vouch for them.
Source
If you want to compile and install PSPP yourself, you can get the source code fromhttp://ftpmirror.gnu.org/pspp.Should this link be unavailable or unreasonably slow, please select a local mirror site.Once you have downloaded the tarball, refer to the INSTALLfile for installation instructions.
Development Versions
PSPP is under continual improvement. You can get development versions if you are interested to see what the developers are working on. Development versions have undergone less testing than released versions.
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You can fetch the latest development sources fromthe Savannah GITrepository.The installationprocedure is more complex than for released versions, so werecommend this only for developers.
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Automated builds of the developmentversions are performed typically every day.