CrackerJac

MD5 Hash Cracking Software in C#

CrackerJac is a simple yet effective program designed to crack MD5 hashes that are both unsalted and salted in MyBB style Md5(Md5(salt) + Md5(string)).

CrackerJac has two main modes: Dictionary attack and brute force. Dictionary attack works by trying each entry in the dictionary against the specified hash. Brute force attack is a method of last resort, where every possible character up to a certain length is tried against the hash.

Hash Files

Hash files are the files that contain the hashes you are trying to break. The syntax is either of the following:

<name> <md5_hash>

<name> <md5_hash> <salt>

You can have multiple entries in your hash file, seperated by a \n character, with comments in the form of:

<name> <md5_hash>
# This is a comment
<name> <md5_Hash>

Dictionary Files

Dictionary files are files that contain the words that a dictionary attack will use to try and break the hash. Each word is sperated by a \n character, giving it the format:

<word>
<word>
<word>

In the CrackerJac GitHub there is two sample dictionaries which work fairly well. There is of course the Crackstation dictionaries, which are much longer but will take more time to sort through,

Dictionary Attack Mode

Dictionary Attack mode is enabled by default, and requires no special command line parameters. To preform a simple dictionary attack run the command:

CrackerJac <hash_file.txt> <dictionary_file.txt>

CrackerJac will automatically attempt to break each hash in the hash file using each word in the dictionary file. CrackerJac spawns a task (essentially a thread) for each hash in the file.

Advanced Modes

Dictionary attack mode by default checks the entry and only the entry in the dictionary file against the hash. Advanced mode will start by appending the numbers 0-specified number to the end of the entry and trying that against the hash. For example if the hash was for 'laptop123' and the dictionary only contained an entry for 'laptop', CrackerJac in regular mode would not be able to crack it. But in advanced mode it will start appending 1-2-3-etc to the end of laptop until it finds the result.

You must specify the upper bound for the advanced mode with the following syntax:

CrackerJac -a <upper_bound> <hash_file.txt> <dictionary_file.txt>

The upper_bound can be any positive integer greater than 0.

Another advanced mode is caps mode, where the normal dictionary entry of a hash is tried, and then tried again with the same entry with a capitalized first letter. If the hash was for 'Laptop' and the dictionary entry was 'laptop', -c mode would try 'Laptop', finding the result.

The syntax for a caps mode is:

CrackerJac -c <hash_file.txt> <dictionary_file.txt>

To combine both modes together, say for the hash 'Laptop123', you would do:

CrackerJac -c -a 500 <hash_file.txt> <dictionary_file.txt>

MyBB Salted Hash Mode

This is a flag you can enable to have CrackerJac use the MyBB-style method of hashing passwords, which is Md5(Md5(salt) + Md5(password)). In your hash file you must use the second syntax, which is:

<name> <md5_hash> <salt>

The MyBB mode can be combined with any other modes of dictionary attack, for example:

CrackerJac -m -c -a 500 <hash_file.txt> <dictionary_file.txt>

Brute Force Mode

Brute force is often regarded as the last option, brute force works by trying every single character possible in order to try and find the hash. It is unlikely that a brute force will be successful for days if not weeks.

When running a brute force attack you specify the max amount of characters you want the generated string to be before it gives up. The syntax is:

CrackerJac -b <max_length> <hash_file.txt>

By default the alphabet for brute forcing is STDCOMPLETE, which is A-Z and a-z. You can change the alphabet for brute forcing with the -l --letters flag to STDCOMPLETE, STDLOWER, STDUPPER, NUMS, or SYMS.

CrackerJac -b <max_length> -l STDLOWER <hash_file.txt>

Other Features

CrackerJac comes with hashing features that are useful for debugging and testing. For instance you can use the hash generation methods to create a hash like so:

CrackerJac --generate-unsalted <string>
CrackerJac --generate-salted <string> <salt>

CrackerJac also comes with a way for you to search through your dictionary file and determine if a dictionary entry is in it. Syntax is:

CrackerJac -s <query> <dictionary_file.txt>

You can change the hashing method from MD5 to RIPEMD160, SHA1, SHA256, SHA384, or SHA512 with the -t --type [METHOD] option.

CrackerJac -t SHA256 --gu test

CrackerJac -t SHA512 <hash_file.txt> <dictionary_file.txt>

Complete List of Flags

Flag	Description
-a --advanced	Turns on advanced mode 0-[MAX].
-b --brute-force	Enables brute force mode with [MAX] length.
-c --caps	Enables checking the regular and capitalized word.
-gu --generate-unsalted	Generates an unsalted hash with [STRING].
-gs --generate-salted	Generates a salted hash with [STRING] [SALT].
-h --help	Displays help and exits.
-l --letters	Changes the alphabet for brute force to [ALPHA]. Which can be STDCOMPLETE STDLOWER STDUPPER NUMS SYMS or a file_path.
-m --mybb	Enables MyBB salted hash mode.
-o --output	Sends output of crack to [FILE].
-s --search	Searches for [QUERY] in [DICTIONARY_LOCATION].
-t --type	Changes the hashing type from default MD5 to [METHOD].