Cracking Passwords with Hashcat

Hashcat can be downloaded here(https://hashcat.net/hashcat/). It can be used on Kali Linux. It possesses the following features:

👉It is multi-threaded;
👉It is multi-hash and multi-OS based (Linux, Windows and OSX native binaries);
👉It is multi-Algorithm based (MD4, MD5, SHA1, DCC, NTLM, MySQL, etc.);
👉All attack-modes can be extended by specialized rules;
👉It is possible to resume or limit sessions automatically. They recognize recovered hashes from the outfile at startup;
👉It can load the salt list from the external file. This can be used as a brute-force attack variant;
👉The number of threads can be configured and executed based on the lowest priority;
👉It supports both hex-charset and hex-salt files;
👉The 90+ Algorithm can be implemented with performance and optimization in mind.


A small laboratory setup of how to crack a password is presented in the next section. A dictionary attack will be simulated for a set of MD5 hashes initially created and stored in a target file. The “rockyou” wordlist found in Kali Linux was used.


@fsocietyofficial

How to crack a password via a dictionary attack.

1. Create a dictionary with MBD5 hashes:

To begin this demonstration, we will create multiple hash entries containing several passwords. They will then be outputted to a file called “target_hashes.” Each command should be executed in the terminal, as demonstrated in the screenshot below:

The -n option removes the new line added to the end of “Password.” This is important as we don’t want the new line characters to be hashed with our password. The part
“tr –d ‘ -‘ “removes any characters that are a space or hyphen from the output.

2. Check password hashes:

To do this, we need to type the following command line in the terminal:

cat target_hashes.txt.

This is also illustrated in the screenshot below:

3. Start Hashcat in Kali Linux:

Hashcat can be started on the Kali console with the following command line:

hashcat -h.

This is illustrated in the screenshot below:

Some of the most important hashcat options are -m (the hashtype) and -a (attack mode). In general, we need to use both options in most password cracking attempts when using Hashcat.

Hashcat also has specifically designed rules to use on a wordlist file. The character list can be customized to crack the password(s).

Finally, Hashcat provides numerous options for password hashes that can be cracked. This can be seen in the screenshot below:

4. Choose the wordlist:

Kali Linux has numerous wordlists built right into it. To find them, use the following command line:

locate wordlists.

This is illustrated in the screenshot below:

5. Cracking the hashes:

In the final step, we can now start cracking the hashes contained in the target_hashes.txt file. We will use the following command line, as illustrated below:

👉-m 0 designates the type of hash we are cracking (MD5);
👉-a 0 designates a dictionary attack;
👉-o cracked.txt is the output file for the cracked passwords;
👉target_hashes.txt is our input file of hashes;
👉/usr/share/wordlists/rockyou.txt
is the absolute path to the wordlist file for this dictionary attack.

6. Results:

Finally, we have cracked 5 out of 7 target hashes that were initially proposed. These can be seen below:

These passwords are weak, and it does not take much effort or time to crack them. It is important to note that the simpler the password is, the easier it will be to detect.

Thus, make your password into a long and complex one. Also, avoid using obvious personal information; never reuse passwords, and change them regularly.

@fsocietyofficial

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