Top Free ICS/OT Cybersecurity Resources to Level Up Your Skills

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Industrial Control Systems (ICS) and Operational Technology (OT) cybersecurity is a critical field that bridges IT and industrial environments. Here’s a compiled list of top free resources to enhance your ICS/OT security knowledge:

1. YouTube Channel

🔗 youtube.com/@utilsec

2. Weekly Email Newsletter

🔗 Sign up here

  1. 25-Hour Free Course: Getting Started with ICS/OT Cybersecurity
    🔗 Course Link

4. eBook: ICS/OT Cybersecurity for IT Professionals

🔗 Download here

5. eBook: ICS/OT Cybersecurity for OT Professionals

🔗 Download here

6. 10+ Hour OSINT for ICS/OT Course

🔗 Course Link

  1. 100 ICS/OT Review Questions (From 20+ Hour Course)
    🔗 Access here

8. QuickStart Guide: Shodan for ICS/OT

🔗 Guide Link

9. QuickStart Guide: Nmap for ICS/OT

🔗 Guide Link

10. LinkedIn Posts for Daily ICS/OT Insights

🔗 Follow Mike Holcomb

You Should Know: Essential ICS/OT Cybersecurity Commands & Tools

Shodan for ICS Device Discovery

shodan search port:502 PLC 
shodan host <IP> 
shodan download --limit 1000 ICS_results.json industrial-control-systems

Nmap for ICS/OT Network Scanning

nmap -sS -p 80,443,502,102,44818 --script modbus-discover <TARGET_IP> 
nmap -sU -p 161,162 --script snmp-info <TARGET_IP>

Modbus TCP Security Checks

python3 modbus-cli.py -h <TARGET_IP> -p 502 -r 0 -c 10

PLC Exploitation with Metasploit

msfconsole 
use auxiliary/scanner/scada/modbusdetect 
set RHOSTS <TARGET_IP> 
run

Detecting ICS Protocols with Wireshark Filters

[/bash]

modbus || dnp3 || ethernet.type == 0x88ba


Securing ICS Networks with Linux Firewalls 
[bash]
sudo iptables -A INPUT -p tcp --dport 502 -j DROP  Block Modbus TCP 
sudo iptables -A INPUT -s 192.168.1.0/24 -j ACCEPT  Allow internal ICS traffic

ICS/OT Log Monitoring with Grep

grep -i "unauthorized access" /var/log/syslog 
grep -E "PLC|SCADA|HMI" /var/log/secure

Automating ICS Asset Discovery with Python

import nmap 
scanner = nmap.PortScanner() 
scanner.scan('192.168.1.0/24', '502,102') 
for host in scanner.all_hosts(): 
print(f"Found ICS device: {host}")

What Undercode Say

ICS/OT security is a growing concern as industrial systems become more connected. Attackers target PLCs, HMIs, and SCADA systems due to weak authentication and legacy protocols. Mastering tools like Shodan, Nmap, and Modbus CLI helps identify vulnerabilities before adversaries do. Always segment OT networks, disable unused services, and monitor for abnormal traffic.

Expected Output:

  • Discover exposed ICS devices using Shodan.
  • Scan networks safely with Nmap for Modbus/DNP3.
  • Implement strict firewall rules to block unauthorized access.
  • Use Python scripts for automated asset discovery.

By leveraging these free resources and commands, you can significantly improve your ICS/OT security posture. Stay vigilant and keep learning! 🚀

References:

Reported By: Mikeholcomb Want – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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