How to Get Started in OT/ICS Cybersecurity: A Comprehensive Guide

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Mike Holcomb’s guide on starting a career in Operational Technology (OT) and Industrial Control Systems (ICS) cybersecurity is a must-read for IT professionals transitioning into this critical field. Below, we break down his 10-step approach and supplement it with practical commands, tools, and techniques to accelerate your learning.

10 Steps to Get Started in ICS/OT Cybersecurity

1. Learn to Think Like an Engineer

• Understand system reliability over security-only mindsets.
• Use Wireshark to analyze industrial protocols:

  wireshark -k -i eth0 -Y "modbus || dnp3 || opcua"
  

2. Understand Industrial Control Basics

• Learn PLC programming (Ladder Logic, Structured Text).
• Simulate PLCs using OpenPLC:

  git clone https://github.com/thiagoralves/OpenPLC_v3.git
  cd OpenPLC_v3
  ./install.sh
  

3. Explore Training Options

• Free 25+ hour course: Mike Holcomb’s YouTube.
• SANS ICS515: Active defense in OT environments.

4. Learn Standards & Regulations

• Study NIST SP 800-82, IEC 62443, NERC CIP.
• Use GRASSMARLIN for network mapping:

  java -jar grassmarlin.jar -i eth0 -o output.xml
  

5. Gain Hands-On Experience

• Set up a lab with Conpot (ICS Honeypot):

  pip install conpot
  conpot --template default
  

6. Network with the Community

• Join ICS-ISAC, Dragos Community, Nozomi Networks.

7. Stay Current

• Monitor CISA ICS Advisories:

  curl -s https://www.cisa.gov/ics/advisories | grep -E 'href="..pdf"'
  

8. Find a Mentor

• Engage in LinkedIn OT security groups.

9. Build Soft Skills

• Practice incident response communication.

10. Get Certified

• GICSP, CISSP, OSCP (for ICS focus).

You Should Know: Critical OT Security Tools & Commands

Network Monitoring in OT

• Snort for ICS Traffic Detection:

  snort -c /etc/snort/snort.conf -A console -q -i eth0
  

PLC Exploitation (Defensive Testing)

• Metasploit Modbus Module:

  use auxiliary/scanner/scada/modbusdetect
  set RHOSTS 192.168.1.100
  run
  

ICS Protocol Fuzzing

• Defensics (for DNP3, Modbus testing):

  defensics --protocol modbus --target 192.168.1.50
  

Windows ICS Hardening

• Disable unnecessary services:

  Stop-Service -Name "WinRM" -Force
  Set-Service -Name "WinRM" -StartupType Disabled
  

Linux-Based ICS Forensics

• Dump PLC Memory via Open Source Tools:

  python2 plcscan.py -a 192.168.1.10 -p 502
  

What Undercode Say

The demand for OT/ICS cybersecurity professionals is skyrocketing due to increasing attacks on critical infrastructure. Mastering industrial protocols (Modbus, DNP3, OPC UA) and defensive techniques is non-negotiable.

Prediction

• Ransomware will increasingly target OT systems (e.g., Colonial Pipeline-style attacks).
• AI-driven ICS attacks will emerge, requiring automated defense strategies.

Expected Output:

• Free Course: Mike Holcomb’s ICS Cybersecurity YouTube
• Tools: Wireshark, Conpot, GRASSMARLIN, Metasploit
• Standards: NIST SP 800-82, IEC 62443

Start applying these steps today to secure critical infrastructure! 🚀

References:

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

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