John The Ripper is a free and open-source software for fast password cracking. Cracking DMG, RAR and other types of passwords is made easier using magnumripper's 'jumbo' version of John The Ripper.
Install John
Install John The Ripper using brew
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Find John The Ripper Utilities Folder
John comes with extra utilities to help generate hashes. By default brew does not install/symlink john's extra utilities to the PATH folder /usr/local/bin. The path can be found in a variety of ways:
- Using
lsand following the path will eventually return/usr/local/Cellar/john-jumbo/1.9.0/share/john/or similar:
- If you have
readlinkinstalled, it's even easier:
Generating Hashes
When cracking files, John cracks the hash of the password rather than the file itself. To generate the hash files, we use the extra utilities from the folder in the last step.
For DMG files, we'll pass the encrypted-files.dmg file to the dmg2john command and output the hash to a .hash file.
The other tools available to generate hash files are:
- RAR:
rar2john_cmd - PDF:
pdf2john.pl - ZIP:
zip2john - 7Z:
7z2john.pl
Crack the Hash
The last step is to crack the hash. We use the john tool directly for this step.
To ensure the GPU instead of the CPU is doing the cracking, specify a format with -opencl in its suffix. For example, dmg will be significantly slower than using dmg-opencl.
You can see the password above is abc_123. If it's not clear you can run john --show encrypted-files.dmg.hash to present it clearer.
To make things even faster, if you have an idea of what the password is, you can pass a regular expression to john using the --mask flag.
Dmg Password Crackers
Another thing I like to do at the end is remove the password on the DMG file and keep it empty:
Dmg Password Hack
Now when you open it, click the OK button.
Script
Dmg Password Cracker
To put all the above together, I use this script to set aliases to crack DMG files