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Introduction
Operational Technology (OT) and Industrial Control Systems (ICS) security is a critical yet often overlooked aspect of cybersecurity. Unlike traditional IT penetration testing, OT/ICS environments require specialized knowledge to assess risks without disrupting industrial processes. Mike Holcomb’s one-day course, “Intro to Penetration Testing for OT/ICS Environments,” bridges this gap by providing hands-on training tailored for securing power plants, refineries, water treatment facilities, and other critical infrastructure.
Learning Objectives
- Understand the key differences between IT and OT penetration testing.
- Learn safe methodologies for assessing OT/ICS environments.
- Gain hands-on experience through labs and real-world attack simulations.
You Should Know
1. Pivoting from IT to OT Networks
Command:
nmap -sS -Pn -p 502 --script modbus-discover.nse <OT_IP_Range>
Step-by-Step Guide:
This Nmap script scans for Modbus TCP (port 502) devices in an OT network.
1. Install Nmap and the NSE script library.
2. Replace `` with the target subnet.
- Analyze results to identify exposed PLCs and RTUs.
2. Safely Conducting OT Reconnaissance
Command:
python3 plcscan.py -i <Target_IP> -p 102
Step-by-Step Guide:
`plcscan.py` is a Python tool for detecting Siemens S7 PLCs.
1. Clone the tool from GitHub.
2. Run against a suspected PLC IP.
3. Avoid aggressive scanning to prevent process disruption.
3. Enumerating OT Assets with Shodan
Query:
port:502,102,20000 org:"Power Utility"
Step-by-Step Guide:
- Create a Shodan account and obtain an API key.
- Use the query to find exposed OT devices.
3. Correlate findings with internal asset inventories.
4. Attacking OT Protocols (Modbus)
Metasploit Module:
use auxiliary/scanner/scada/modbus_banner_grabbing
Step-by-Step Guide:
1. Launch Metasploit Framework.
2. Set RHOSTS to the target IP.
- Execute to extract device banners without sending malicious payloads.
5. Writing an OT Penetration Testing Report
Template Structure:
1. Executive Summary – High-level findings.
2. Methodology – Safe testing approach.
- Risk Ratings – Impact on safety and operations.
4. Recommendations – Patch management, network segmentation.
What Undercode Say
- Key Takeaway 1: OT pentesting requires a safety-first mindset—unlike IT, mistakes can cause physical damage.
- Key Takeaway 2: Hands-on labs are essential for understanding real-world OT attack surfaces.
Analysis:
The growing convergence of IT and OT networks increases attack surfaces in critical infrastructure. This course addresses the urgent need for skilled OT security professionals by combining theory with practical labs. As ransomware attacks on ICS rise (e.g., Colonial Pipeline), such training becomes indispensable for defenders.
Prediction
By 2026, OT-specific penetration testing certifications will become mandatory for industrial cybersecurity roles. Organizations that invest in OT security training today will mitigate future operational disruptions.
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IT/Security Reporter URL:
Reported By: Mikeholcomb Very – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
