John The Ripper Hash Formats. John the Ripper is a favourite password cracking tool of many pentesters. There is plenty of documentation about its command line options. I’ve encountered the following problems using John the Ripper. These are not problems with the tool itself, but inherent problems with pentesting and password cracking in general.

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• John The Ripper Hash Formats John the Ripper is a favourite password cracking tool of many pentesters. There is plenty of documentation about its command line options.
• Windows password cracking using John The Ripper. In this post I will show you how to crack Windows passwords using John The Ripper. John the Ripper is a fast password cracker, primarily for cracking Unix (shadow) passwords.Other than Unix-type encrypted passwords it also supports cracking Windows LM hashes and many more with open source contributed patches.
• The only remaining > problems were the fact that John lacks raw MD5 support (except with > contributed patches) and that hex-encoded raw MD5 hashes look exactly > the same as PWDUMP'ed LM hashes, so John can't distinguish the two. > > > Adding the --single option didn't change anything. > > Indeed - it is completely irrelevant to your problem.

John the Ripper password cracker

John the Ripper – Cracking passwords and hashes
John the Ripper is the good old password cracker that uses wordlists/dictionary to crack a given hash. Can crack many different types of hashes including MD5, SHA etc. It has free as well as paid password lists available. It is cross platform.

John the Ripper is a free and fast password cracking software tool. Initially developed for the Unix operating system, it now runs on fifteen different platforms (eleven of which are architecture-specific versions of Unix, DOS, Win32, BeOS, and OpenVMS). Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix systems.

Supported out of the box are Windows LM hashes, plus lots of other hashes and ciphers in the community-enhanced version.

It is one of the most popular password testing and breaking programs as it combines a number of password crackers into one package, auto detects password hash types, and includes a customizable cracker. It can be run against various encrypted password formats including several crypt password hash types most commonly found on various Unix versions (based on DES, MD5, or Blowfish), Kerberos AFS, and Windows NT/2000/XP/2003 LM hash. Additional modules have extended its ability to include MD4-based password hashes and passwords stored in LDAP, MySQL, and others.

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Attack types

One of the modes John can use is the dictionary attack. It takes text string samples (usually from a file, called a wordlist, containing words found in a dictionary or real passwords cracked before), encrypting it in the same format as the password being examined (including both the encryption algorithm and key), and comparing the output to the encrypted string. It can also perform a variety of alterations to the dictionary words and try these. Many of these alterations are also used in John’s single attack mode, which modifies an associated plaintext (such as a username with an encrypted password) and checks the variations against the hashes.

John also offers a brute force mode. In this type of attack, the program goes through all the possible plain texts, hashing each one and then comparing it to the input hash. John uses character frequency tables to try plaintexts containing more frequently used characters first. This method is useful for cracking passwords which do not appear in dictionary wordlists, but it takes a long time to run.

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I am trying to use John the Ripper with custom rules. I first added few extra rules in /etc/john/john.conf. For example -

Next I tried to generate passwords using those rules but getting extra parameter option

I am using john 1.7.8 in Ubuntu 12.04.3 LTS installed using apt-get. Any idea? Thanks in advance for the help.

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2 Answers

I had the same problem with the simple version of JTR (John the Ripper 1.9.0) but it works in 'jumbo' edition

I could run something

So just go here http://www.openwall.com/john/ and download the current version of John the Ripper 1.9.0-jumbo-1 (sources, tar.xz, 23 MB)

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An extra tip: I also had a problem compiling it so try to run

./configure

separately to

make

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As far as I know, current versions of JTR do not support '--rules=something'. There is a mention of this over on the john-users mailing list.

So what you will want to do is replace an existing section of the john.conf file with your desired rule set.

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