Brute forcing a Zip file or a Rar file
requires a wordlist or a dictionary file which can be used to start a trail and
error method of checking password or a hash. If the password from the
dictionary or the wordlist matches the password of the password protected file,
it opens or else you need to try using a different wordlist or if you can think
of something special kind of wordlist – you can generate one using Crunch tool.
There are many tools to generate wordlist – but Crunch and CUPP are my
favourite.
In this post we are going to see how
to crack/ brute force a password protected rar file or a zip file using john
the ripper, which is one of the most widely used and most useful tool for
cracking a huge variety of files.
THIS IS CREATED FOR EDUCATIONAL & ETHICAL PURPOSE, AUTHOR IS NOT RESPONSIBLE FOR ANY ILLEGAL ACTIVITIES DONE BY THE VISITORS
THIS IS CREATED FOR EDUCATIONAL & ETHICAL PURPOSE, AUTHOR IS NOT RESPONSIBLE FOR ANY ILLEGAL ACTIVITIES DONE BY THE VISITORS
So, What is John The Ripper:
John the Ripper is an open source tool
used to check for weak credentials and can also be used for cracking passwords.
John The Ripper makes use of the wordlists to brute force the credentials, it
can take direct strings and check them as passwords for the given hashes or
files. John the Ripper can modify/alter the passwords in the dictionary and use
it as a passphrase to check.
Cracking a Password Protected Rar/Zip File using John The Ripper:
Step 1. Download
and Open John the Ripper
Step 2. Right
click anywhere in the Directory and click on “Open in Terminal”
Step 3. Type
the Following commands Step 4. Now we need to create a
hash for the file that you want to hack. To create the hash and save the hash
into a file – Type the command Zip2john ‘LocationOfTheFile/filename.zip yourfile.txt Step 5. To view the hash type ;
type the name of the file that you saved the hash into. Step 6. We need to crack the
hash using john the ripper. Here for example I am using the default wordlist by
john the ripper. To start cracking the password of the zip file, type the
following command. John checks all the passphrases from the wordlist and shows the output ASAP.
Step 7. If you want to use your
own wordlist, all you need to do is add -wordlist=filename.txt to the command.
For example it looks like the command below
john -wordlist= /usr/share/wordlists/rockyou.txt anyfile.txt
Well, that’s how you crack a zip file or a rar
file using john the ripper. Pretty simple, cracking the password using john is
the fastest way and getting the password varies on the complexity of the
password used. It is not possible to crack the password all the file, if the
password is not in the wordlist that you used – it’s just a waste of time :P.
Choose your wordlist wisely or if possible create your own wordlist using crunch or
CUPP.
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