Junjun Mao’s blog to manually patch John to handle SHA 512. You can get john from Do not compile the program just yet though. Thankfully, we can patch John to deal with SHA-512.įirst, download the source for John and unpack it. If you try to run John you will receive the following message: Now, the current version of John the Ripper does not handle SHA 512 at all. Each of those values corresponds to a specific hash algorithm.Īs we can see, the example entry above this /etc/shadow file is using SHA 512 hashing to protect password data at rest. Here will be equal to one of the following values: $1$, $5$, or $6$. The field of interest for us is the second field- $$. Let’s take a look at a sample line from an /etc/shadow file (Ubuntu 10.04): However, if you are working from a recent OS (e.g., Ubuntu 9.04 or later) that uses SHA-512 hashing John has a problem. We can also come back at a later time and check the credentials again by defining the unshadowed file and add the parameter –show.John the Ripper ( ) is a well-known and mature password auditing tool. In this example we can see that the the password for the user SuperAdmin was Password1. If you let john run you will be prompted with the credentials as soon as they have been cracked. John -wordlist=/usr/share/wordlists/rockyou.txt hashtocrack.txt In this example we define the wordlist to use to the built in rockyou.txt.
Brute forcing takes a lot of time and I recommend you to only use it as a last resort when your wordlists won’t crack the hashes. The method I will use in this example is wordlist mode since that is the most effective way. You can use wordlists or straight brute force. Unshadow passwd.txt shadow.txt > hashtocrack.txt Now we need to combine these two files into one. It can be done with the following commands.Ģ – Combine passwd and shadow with unshadow
Save them to your Kali Linux machine, preferably on the desktop. We will need both /etc/passwd and /etc/shadow. We will start with collecting the hashes from the target machine.
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