Wifi wpa2psk password hack via android

by 00:40 1 comments

Welcome, my hacker friend

As part of my series on hacking Wi-Fi, I want to demonstrate another excellent piece of hacking software for cracking WPA2-PSK passwords. In my last post, we cracked WPA2 using aircrack-ng. In this tutorial, we'll use a piece of software developed by wireless security researcher Joshua Wright called cowpatty (often stylized as coWPAtty). This app simplifies and speeds up the dictionary/hybrid attack against WPA2 passwords, so let's get to it!

Step 1: Find the Cowpatty
Cowpatty is one of the hundreds of pieces of software that are included in the BackTrack suite of software. For some reason, it was not placed in the /pentest/wireless directory, but instead was left in the /usr/local/bin directory, so let's navigate there.

cd /usr/local/bin
Because cowpatty is in the /usr/local/bin directory and this directory should be in your PATH, we should be able to run it from any directory in BackTrack.

Step 2: Find the Cowpatty Help Screen
To get a brief rundown of the cowpatty options, simply type:

cowpatty
BackTrack will provide you a brief help screen. Take a note that cowpatty requires all of the following.

a word list
a file where the password hash has been captured
the SSID of the target AP
Step 3: Place the Wireless Adapter in Monitor Mode
Just as in cracking with aircrack-ng, we need to put the wireless adapter into monitor mode.

airmon-ng start wlan0
Step 4: Start a Capture File
Next, we need to start a capture file where the hashed password will be stored when we capture the 4-way handshake.

airodump-ng --bssid 00:25:9C:97:4F:48 -c 9 -w cowpatty mon0
This will start a dump on the selected AP (00:25:9C:97:4F:48), on the selected channel (-c 9) and save the the hash in a file named cowcrack.

Step 5: Capture the Handshake
Now when someone connects to the AP, we'll capture the hash and airdump-ng will show us it has been captured in the upper right-hand corner.

Step 6: Run the Cowpatty
Now that we have the hash of the password, we can use it with cowpatty and our wordlist to crack the hash.

cowpatty -f /pentest/passwords/wordlists/darkc0de.lst -r /root/cowcrack-01.cap -s Mandela2
As you can see in the screenshot above, cowpatty is generating a hash of every word on our wordlist with the SSID as a seed and comparing it to the captured hash. When the hashes match, it dsplays the password of the AP.

Step 7: Make Your Own Hash
Although running cowpatty can be rather simple, it can also be very slow. The password hash is hashed with SHA1 with a seed of the SSID. This means that the same password on different SSIDs will generate different hashes. This prevents us from simply using a rainbow table against all APs. Cowpatty must take the password list you provide and compute the hash with the SSID for each word. This is very CPU intensive and slow.

Cowpatty now supports using a pre-computed hash file rather than a plain-text word file, making the cracking of the WPA2-PSK password 1000x faster! Pre-computed hash files are available from the Church of WiFi, and these pre-computed hash files are generated using 172,000 dictionary file and the 1,000 most popular SSIDs. As useful as this is, if your SSID is not in that 1,000, the hash list really doesn't help us.

In that case, we need to generate our own hashes for our target SSID. We can do this by using an application called genpmk. We can generate our hash file for the "darkcode" wordlist for the SSID "Mandela2" by typing:

genpmk -f /pentest/passwords/wordlists/darkc0de.lst -d hashes -s Mandela2

Step 8: Using Our Hash
Once we have generated our hashes for the particular SSIDs, we can then crack the password with cowpatty by typing:

cowpatty -d hashfile -r dumpfile -s ssid

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