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Note that John can't crack hashes of different types at the same time. If you happen to get a password file that uses more than one hash type, then you have to invoke John once for each hash type and you need to use this option to make John crack hashes of types other than the one it would autodetect by default. Extracting hashes The jumbo version of John the Ripper comes with a Python script called truecrypt2john.py. This can be used to extract hashes from a TrueCrypt volume with a command similar to the following./truecrypt2john.py test.tc truecrypthashes.txt. Today, I'm gonna show you how to crack MD4, MD5, SHA1, and other hash types by using John The Ripper and Hashcat. John The Ripper: 'John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. 3 – Crack with John Now we are ready to crack the hashes. John can run in different modes. You can use wordlists or straight brute force. The method I will use in this example is wordlist mode since that is the most effective way.

This post assumes you have access to a the target filesystem in question and want to extract and then crack the password hashes from the local machine.

In this example I am going to crack the account passwords used in Metasploitable 2 but the techniques here can be used in many different scenarios.

Free download dwg viewer for mac os x. John the Ripper is included by default with Kali 2 – which is what I am using here.

To be able to crack the accounts we need two files from the target system:

• /etc/passwd -> Containing the user information
• /etc/shadow -> Containing the corresponding password hashes for the users

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(Again there are various ways you could grab these files – for a vey simple example using Metaspolitable 2 as the target see this post here: https://securityaspirations.com/2017/07/03/metasploitable-2-compromise-nfs-shares/)

Once you have the two files we can begin cracking them with John the Ripper.

However before we give the hashes to John, we need to combine the two files into one so that the user and the password hashes are merged. We can do this with a utility called ‘Unshadow’ (also included in Kali2 by default).

The command required is:

unshadow Path_to_passwd Path_to_shadow > output.txt

Now we have the combined merged.txt file:

Now lets put john to work. We could supply a password list for John to use but it comes with a default set of passwords so we may as well try those first.

To start the crack, point John at our newly created file: Facebook download mac.

Within a couple of seconds we appear to have a hit on most of the accounts:

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It’s not always this quick and of course we are still missing the ‘root’ account but you get the idea. I let the crack run for another hour before cancelling but the root account had still not being cracked. The password may be hidden in the John password list I would just need to let the cracking process run to completion to find out. If that failed it might be worth trying some bigger password lists (such as the ‘rockyou’ list).

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One way or another, once complete, you can view each of the accounts and their corresponding passwords by running the following command and referencing the original file you gave John to crack:

john show <file.txt>

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Download vmware workstation pro for mac. If you want to confirm they work, test them out on the Metasploitable box: