How to Identify and Crack Hashes

Hi my fellow hackers!

Today I will teach you how hashes are made and how you can identify and crack them.

Leaked hashes can sometimes be hard to identify and and even harder to crack

in this tutorial I will teach you to to do both with some awesome tools

Step 1: How to Identify Hashes

Identifying Hash Algorithm

Before we start discussing about hash identification I want to tell you something real quick,

Hexadecimal Numbers: 0,1,2,3,4,5,6,7,8,9, a,b,c,d,e,f are called hexadecimal characters. To know more about hexadecimal numbers,read this WikiPedia entry.

Each hexadecimal number represent 4 bits. Now for example, the string "a26fe" contains 5 Hexadecimal characters so I can say its a 4 x 5 = 20 bit string. Easy? Great.

Now take a look at this hash, 5187942d399d4ed244068db70a11319e

It contains only hexadecimal numbers right? The number of characters in this hash is 32.

Hence the length of the hash in bits can be calculated as, 32 x 4 = 128 bits

Now here is a nice and list of bit-lengths of different hash types:

Name Length

MD2 128 bits

MD4 128 bits

MD5 128 bits

MD6 Up to 512 bits

RIPEMD-128 128 bits

RIPEMD-160 160 bits

RIPEMD-320 320 bits

SHA-1 160 bits

SHA-224 224 bits

SHA-256 256 bits

SHA-384 384 bits

SHA-512 512 bits

SHA-3 (originally known as Keccak) arbitrary

Tiger 192 bits

Whirlpool 512 bits

Hmmm, so the bit-length of our target hash is 128 bits and according the table above, it can be any of these four hashes:

MD2 (Designed in 1989)

MD4 (Designed in 1990)

MD5 (Designed in 1991)

RIPEMD-128 (Designed in 2004)

As you can see, MD5 is the newest 128 bit-length hash in MD Category so no one uses MD2 and MD4 now-a-days. So we can guess that its an MD5 or a RIPEMD-128.

Now ask yourself, which program generated this hash? Well in my case, I got this hash from an MySQL database while performing SQL Injection.

Now your experience and knowledge comes into play, I know that MySQL database management system usually store passwords as MD5 hashes so I know its an MD5 and not a RIPEMD-128. Windows use NTLM hashing algorithm, Linux use MD5, SHA-256 or SHA-512, Blowfish etc., Maria DBMS uses MD5 or SHA-1.

So here's the conclusion:

Find the bit-length of the hash and write down possible hash types

Use your common sense to make an educated guess

But if you are lazy then you can just use this website to make guesses for you. Or if you want something better then you can use a program named "Hash-identifier".

Linux users can install it via the following command in the terminal

apt-get install hash-identifier

Using hash-identifier is a piece of cake. Run it and enter your hash and it makes really good guesses for you.

If you are a windows user (unfortunately), then you can download it from its github mirror.

Step 2: Easy Way to Crack Hashes

One of my favorite tools that I use to crack hashes is named Findmyhash.

Hash cracking tools generally use brute forcing or hash tables and rainbow tables. But these methods are resource hungry. There are some websites like https://www.crackstation.net and https://www.hashkiller.co.uk which have huge database of hashes and you can check if your target hashes exists in their database or not. Well you should really try to crack your hashes there because doing so is easy and fast.

FindMyHash is a python script which takes your target hashes and checks 40 different hash cracking website for results. So all you have to do is to submit your hash and sit back instead of checking these sites one by one.

Cool huh?

Installing Findmyhash

If you are using Linux, run the following command in terminal

apt-get install findmyhash

You can also download findmyhash.py from github

I hope now you are all set to run it.

"Cracking" Hashes With FindMyHash

Usage:

findmyhash -h

Where algorithm represents the hash algorithm like MD5, SHA-2, Tiger etc. and hash represents the hash you want to crack.

So like I want to crack this MD5 hash —> 827ccb0eea8a706c4c34a16891f84e7b

I will simply enter

findmyhash MD5 -h 827ccb0eea8a706c4c34a16891f84e7b

and it will start looking into databases of different website.

And here we go, here is the cracked hash

Pretty simple right?

You can also use the following command

findmyhash MD5 -h 827ccb0eea8a706c4c34a16891f84e7b -g

You see that -g option at the end? It represents Google. So if these 40 website fail to crack the hash, FindMyHash does the last attempt by searching the hash on Google and tells you if it finds any useful result.

FindMyHash supports the following hash algorithms:

MD4 – RFC 1320

MD5 – RFC 1321

SHA1 – RFC 3174 (FIPS 180-3)

SHA224 – RFC 3874 (FIPS 180-3)

SHA256 – FIPS 180-3

SHA384 – FIPS 180-3

SHA512 – FIPS 180-3

RMD160 – RFC 2857

GOST – RFC 5831

WHIRLPOOL – ISO/IEC 10118-3:2004

LM – Microsoft Windows hash

NTLM – Microsoft Windows hash

MYSQL – MySQL 3, 4, 5 hash

CISCO7 – Cisco IOS type 7 encrypted passwords

JUNIPER – Juniper Networks $9$ encrypted passwords

LDAP_MD5 – MD5 Base64 encoded

LDAP_SHA1 – SHA1 Base64 encoded

For more usages examples you can enter findmyhash -h in terminal.

So can you trust FindMyHash for all your hash cracking needs? No.

Is it worth trying before trying to crack it with a program like HashCat? Yes.

Note: FindMyhash only uses the websites which permit to do so. So you should give sites like hashkiller or crackstation a try too as they are not included in FindMyHash.

That's all for now. Happy Cracking!