Cracking WPA WPA2 with Hashcat oclHashcat or cudaHashcat on Kali Linux (BruteForce MASK based attack on Wifi passwords)
cudaHashcat or oclHashcat or Hashcat on Kali Linux got built-in capabilities to attack and decrypt or crack WPA WPA2 handshake.cap files. Only constraint is, you need to convert a .cap file to a.hccap file format. This is rather easy.
Important Note: Many users try to capture with network cards that are not supported. You should purchase a card that supports Kali Linux including injection and monitor mode etc. A list can be found in802.11 Recommended USB Wireless Cards for Kali Linux. It is very important that you have a supported card, otherwise you’ll be just wasting time and effort on something that just won’t do the job.
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My Setup
I have a NVIDIA GTX 210 Graphics card in my machine running Kali Linux 1.0.6 and will use rockyou dictionary for most of the exercise. In this post, I will show How to crack WPA/WPA2 handshake file (.cap files) with cudaHashcat or oclHashcat or Hashcat on Kali Linux.
I will use cudahashcat command because I am using a NVIDIA GPU. If you’re using AMD GPU, then I guess you’ll be using oclHashcat. Let me know if this assumptions is incorrect.
Why use Hashcat to crack WPA/WPA2 handshake file?
Pyrit is the fastest when it comes to cracking WPA/WPA2 handshake files. So why are we using Hashcat to crack WPA/WPA2 handshake files?
- Because we can?
- Because Hashcat allows us to use customized attacks with predefined rules and Masks.
Now this doesn’t explain much and reading HASHCAT Wiki will take forever to explain on how to do it. I’ll just give some examples to clear it up.
Hashcat allows you to use the following built-in charsets to attack a WPA/WPA2 handshake file.
Built-in charsets
?l = abcdefghijklmnopqrstuvwxyz
?u = ABCDEFGHIJKLMNOPQRSTUVWXYZ
?d = 0123456789
?s = !”#$%&'()*+,-./:;⇔?@[]^_`{|}~
?a = ?l?u?d?s
Numbered passwords
So lets say you password is 12345678. You can use a custom MASK like ?d?d?d?d?d?d?d?d
What it means is that you’re trying to break a 8 digit number password like 12345678 or 23456789 or 01567891.. You get the idea.
Letter passwords – All uppercase
If your password is all letters in CAPS such as: ABCFEFGH orLKHJHIOP or ZBTGYHQS ..etc. then you can use the following MASK:
?u?u?u?u?u?u?u?u
It will crack all 8 Letter passwords in CAPS.
Letter passwords – All lowercase
If your password is all letters in lowercase such as: abcdefgh ordfghpoiu or bnmiopty..etc. then you can use the following MASK:
?l?l?l?l?l?l?l?l
It will crack all 8 Letter passwords in lowercase. I hope you now know where I am getting at.
Passwords – Lowercase letters and numbers
If you know your password is similar to this: a1b2c3d4 or p9o8i7u6or n4j2k5l6 …etc. then you can use the following MASK:
?l?d?l?d?l?d?l?d
Passwords – Uppercase letters and numbers
If you know your password is similar to this: A1B2C3D4 or P9O8I7U6or N4J2K5L6 …etc. then you can use the following MASK:
?u?d?u?d?u?d?u?d
Passwords – Mixed matched with uppercase, lowercase, number and special characters.
If you password is all random, then you can just use a MASK like the following:
?a?a?a?a?a?a?a?a
Note: ?a represents anything …. I hope you’re getting the idea.
If you are absolutely not sure, you can just use any of the predefined MASKs file and leave it running. But yeah, come back to check in a million years for a really long password …. Using a dictionary attack might have more success in that scenario.
Passwords – when you know a few characters
If you somehow know the few characters in the password, this will make things a lot faster. For every known letter, you save immense amount of computing time. MASK’s allows you to combine this. Let’s say your 8 character password starts with abc, doesn’t contain any special characters. Then you can create a MASK rule file to contain the following:
abc?l?l?l?l?l abc?u?u?u?u?u abc?d?d?d?d?d abc?l?u??d??d?l abc?d?d?l?u?l
There will be 125 combinations in this case. But it will surely break it in time. This is the true power of using cudaHashcat or oclHashcat or Hashcat on Kali Linux to break WPA/WPA2 passwords.
You can even up your system if you know how a person combines a password. Some people always uses UPPERCASE as the first character in their passwords, few lowercase letters and finishes with numbers.
Example: Abcde123
Your mask will be:
?u?l?l?l?l?d?d?d
This will make cracking significantly faster. Social engineering is the key here.
That’s enough with MASK’s. Now let’s capture some WPA/WPA2 handshake files.
Capture handshake with WiFite
Why WiFite instead of other guides that uses Aircrack-ng? Because we don’t have to type in commands..
Type in the following command in your Kali Linux terminal:
wifite –wpa
You could also type in
wifite wpa2
If you want to see everything, (wep, wpa or wpa2, just type the following command. It doesn’t make any differences except few more minutes
wifite
Once you type in following is what you’ll see.
So, we can see bunch of Access Points (AP in short). Always try to go for the ones with CLIENTS because it’s just much faster. You can choose all or pick by numbers. See screenshot below
Awesome, we’ve got few with clients attached. I will pick 1 and 2 cause they have the best signal strength. Try picking the ones with good signal strength. If you pick one with poor signal, you might be waiting a LONG time before you capture anything .. if anything at all.
So I’ve picked 1 and 2. Press Enter to let WiFite do it’s magic.
Once you press ENTER, following is what you will see. I got impatient as the number 1 choice wasn’t doing anything for a LONG time. So I pressed CTRL+C to quit out of it.
This is actually a great feature of WIfite. It now asks me,
What do you want to do?
[c]ontinue attacking targets[e]xit completely.
I can type in c to continue or e to exit. This is the feature I was talking about. I typed c to continue. What it does, it skips choice 1 and starts attacking choice 2. This is a great feature cause not all routers or AP’s or targets will respond to an attack the similar way. You could of course wait and eventually get a respond, but if you’re just after ANY AP’s, it just saves time.
And voila, took it only few seconds to capture a handshake. This AP had lots of clients and I managed to capture a handshake.
This handshake was saved in /root/hs/BigPond_58-98-35-E9-2B-8D.cap file.
Once the capture is complete and there’s no more AP’s to attack, Wifite will just quit and you get your prompt back.
Now that we have a capture file with handshake on it, we can do a few things.
Cleanup your cap file using wpaclean
Next step will be converting the .cap file to a format cudaHashcat or oclHashcat or Hashcat on Kali Linux will understand.
Here’s how to do it:
To convert your .cap files manually in Kali Linux, use the following command
wpaclean <out.cap> <in.cap>
Please note that the wpaclean options are the wrong way round. <out.cap> <in.cap> instead of <in.cap> <out.cap> which may cause some confusion.
In my case, the command is as follows:
wpaclean hs/out.cap hs/BigPond_58-98-35-E9-2B-8D.cap
Convert .cap file to .hccap format
We need to convert this file to a format cudaHashcat or oclHashcat or Hashcat on Kali Linux can understand.
To convert it to .hccap format with “aircrack-ng” we need to use the -J option
aircrack-ng <out.cap> -J <out.hccap>
Note the -J is a capitol J not lower case j.
In my case, the command is as follows:
aircrack-ng hs/out.cap -J hs/out
Cracking WPA/WPA2 handshake with Hashcat
cudaHashcat or oclHashcat or Hashcat on Kali Linux is very flexible, so I’ll cover two most common and basic scenarios:
- Dictionary attack
- Mask attack
Dictionary attack
Grab some Wordlists, like Rockyou.
Read this guide Cracking Wifi WPA/WPA2 passwords using pyrit cowpatty in Kali Linux for detailed instructions on how to get this dictionary file and sorting/cleaning etc.
First we need to find out which mode to use for WPA/WPA2 handshake file. I’ve covered this in great length in Cracking MD5, phpBB, MySQL and SHA1 passwords with Hashcat on Kali Linuxguide. Here’s a short rundown:
cudahashcat --help | grep WPA
So it’s 2500.
Now use the following command to start the cracking process:
cudahashcat -m 2500 /root/hs/out.hccap /root/rockyou.txt
Bingo, I used a common password for this Wireless AP. Took me few seconds to crack it. Depending on your dictionary size, it might take a while.
You should remember, if you’re going to use Dictionary attack, Pyrit would be much much much faster than cudaHashcat or oclHashcat or Hashcat. Why we are showing this here? Cause we can. 🙂
Another guide explains how this whole Dictionary attack works. I am not going to explain the same thing twice here. Read Cracking MD5, phpBB, MySQL and SHA1 passwords with Hashcat on Kali Linux for dictionary related attacks in full length.
Brute-Force Attack
Now this is the main part of this guide. Using Brute Force MASK attack.
To crack WPA WPA2 handshake file using cudaHashcat or oclHashcat or Hashcat, use the following command:
Sample:
cudahashcat -m 2500 -a 3 capture.hccap ?d?d?d?d?d?d?d?d
Where -m = 2500 means we are attacking a WPA/WPA2 handshake file.
-a = 3 means we are using Brute Force Attack mode (this is compatible with MASK attack).
capture.hccap = This is your converted .cap file. We generated it using wpaclean and aircrack-ng.
?d?d?d?d?d?d?d?d = This is your MASK where d = digit. That means this password is all in numbers. i.e. 7896435 or 12345678etc.
I’ve created a special MASK file to make things faster. You should create your own MASK file in similar way I explained earlier. I’ve saved my file in the following directory as blackmoreops-1.hcmask.
/usr/share/oclhashcat/masks/blackmoreops-1.hcmask
Do the following to see all available default MASK files provided by cudaHashcat or oclHashcat or Hashcat:
ls /usr/share/oclhashcat/masks/
In my case, the command is as follows:
cudahashcat -m 2500 -a 3 /root/hs/out.hccap /usr/share/oclhashcat/masks/blackmoreops-1.hcmask
Sample .hcmask file
You can check the content of a sample .hcmask file using the following command:
tail -10 /usr/share/oclhashcat/masks/8char-1l-1u-1d-1s-compliant.hcmask
Edit this file to match your requirement, run Hashcat or cudaHashcat and let it rip.
Location of Cracked passwords
Hashcat or cudaHashcat saves all recovered passwords in a file. It will be in the same directory you’ve ran Hashcat or cudaHashcat or oclHashcat. In my case, I’ve ran all command from my home directory which is /root directory.
cat hashcat.pot
ETHICAL HACKING 