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Introduction:
Operational Technology (OT) and Industrial Control Systems (ICS) form the backbone of critical infrastructure, yet cybersecurity in this domain remains notoriously siloed and complex. Visualizing attack surfaces, defense strategies, and protocol vulnerabilities is often the fastest path to mastery, and a veteran expert has just released a massive free repository of infographics, guides, and prompts to accelerate your learning curve.
Learning Objectives:
- Identify key OT/ICS security fundamentals, defensive strategies, and career pathways using curated visual resources.
- Apply GenAI prompts to generate security scripts and configuration audits for industrial environments.
- Execute Linux and Windows commands to map OT networks, detect anomalies, and harden ICS gateways.
You Should Know:
1. Navigating the Free OT/ICS Cybersecurity Vault
The post by Mike Holcomb unlocks a Google Drive vault (https://lnkd.in/e5gk9sM2) and a dedicated infographics page (https://lnkd.in/enRVqK8w) containing hundreds of hours of visualized content. Categories include Tools, Career, Resources, Fundamentals, GenAI Prompts, and Defensive Strategies. This vault is a goldmine for both beginners and seasoned engineers.
Step‑by‑step guide to access and organize the vault:
- Click the shortened link: https://lnkd.in/e5gk9sM2 (resolves to a public Google Drive folder).
- Browse subfolders – prioritize “Fundamentals” if new to OT/ICS, then “Defensive Strategies”.
3. Download infographics as PNG/PDF for offline reference.
- Use “GenAI Prompts” folder to copy ready-made prompts for ChatGPT or local LLMs (e.g., “Generate a Modbus TCP firewall rule set”).
- Subscribe to the newsletter (https://lnkd.in/ePTx-Rfw) for weekly updates and new infographics.
Linux command to monitor OT network interfaces:
sudo tcpdump -i eth0 -n -c 100 'tcp port 502' Capture Modbus traffic sudo nmap -sS -p 502,44818,2222 --open 192.168.1.0/24 Scan for common ICS ports
Windows command to check local ARP table for rogue devices:
arp -a netstat -an | findstr ":502" Find Modbus connections
2. Leveraging GenAI Prompts for OT Security Automation
The vault includes pre-built GenAI prompts that convert natural language into actionable security configurations. For example, a prompt might generate a Snort rule to detect abnormal DNP3 behavior or an Ansible playbook to patch a Siemens PLC.
Step‑by‑step guide to using GenAI prompts for hardening:
- Open the “GenAI Prompts” folder in the Google Drive.
- Copy a prompt like: “You are an OT security expert. Write a Python script to parse Modbus/TCP packets and alert on function codes 0x05 (write coil) from unknown IPs.”
- Paste into ChatGPT, , or a local LLM (e.g., Llama 3).
- Run the generated script in a safe lab environment (use `pip install scapy` for packet manipulation).
- Adapt the script to log to a SIEM or send Syslog alerts.
Example generated script snippet (Python with Scapy):
from scapy.all import
def modbus_alert(pkt):
if pkt.haslayer(TCP) and pkt[bash].dport == 502:
modbus_data = bytes(pkt[bash].payload)
if modbus_data and modbus_data[bash] == 5: Function code 5
print(f"ALERT: Write coil from {pkt[bash].src}")
sniff(filter="tcp port 502", prn=modbus_alert)
3. Hands-On OT/ICS Fundamentals: Mapping a Modbus Network
Understanding the Modbus protocol is essential for any OT defender. The vault’s “Fundamentals” infographics explain register mapping, function codes, and attack vectors. To practice, set up a virtual environment with a Modbus slave and master.
Step‑by‑step guide to simulate and scan a Modbus network:
1. Install a Modbus simulator on Linux: `sudo apt install mbpoll` (client) and `sudo apt install modbus-tk` (Python server).
2. Start a simulated PLC: `python3 -m modbus_tk.server –port 502 –address 1`
3. Scan for Modbus devices using `nmap –script modbus-discover -p 502
4. Read holding registers: `mbpoll -m tcp -a 1 -r 1 -c 10
5. Write a coil (dangerous in production – use only in lab): `mbpoll -m tcp -a 1 -0 1 -1
Windows alternative: Download “Modbus Poll” free version or use `Test-Connection` and custom PowerShell with System.Net.Sockets.TcpClient.
4. Defensive Strategies: Hardening OT Gateways and Firewalls
The “Defensive Strategies” infographics cover network segmentation, unidirectional gateways, and IEC 62443 zones. A common weakness is allowing direct IT-to-OT access. Implement a jump host with strict ACLs.
Step‑by‑step guide to harden an OT firewall (Linux iptables example):
1. Block all direct access from IT subnet to OT subnet except via jump host.
sudo iptables -A FORWARD -s 10.0.0.0/24 -d 192.168.1.0/24 -j DROP sudo iptables -A FORWARD -s 10.0.0.100 -d 192.168.1.0/24 -p tcp --dport 502 -j ACCEPT
2. Log rejected packets for monitoring: `sudo iptables -A FORWARD -j LOG –log-prefix “OT-BLOCK: “`
3. Use `tcpdump -i eth0 -e -n ‘tcp
& 4 != 0'` to detect RST packets indicating port scans. 4. For Windows Server acting as ICS gateway, enable Windows Firewall with: [bash] New-NetFirewallRule -DisplayName "Block IT to OT" -Direction Inbound -RemoteAddress 10.0.0.0/24 -Action Block New-NetFirewallRule -DisplayName "Allow Jump Host" -Direction Inbound -RemoteAddress 10.0.0.100 -Protocol TCP -LocalPort 502 -Action Allow
- Career & Resources: Building Your OT/ICS Security Path
The vault includes career roadmaps and resource links (free videos at https://lnkd.in/eif9fkVg). To transition from IT security to OT, learn Purdue model, safety instrumented systems, and proprietary protocols.
Step‑by‑step guide to create a personal learning plan:
- Watch the free video series on ICS cyber (linked above) – start with “ICS 101”.
- Download the “Career” infographic – map skills like Modbus/DNP3, IEC 62351, and tools such as Wireshark with ICSPrefs, GRASSMARLIN, and Shodan for ICS.
- Set up a virtual lab using OpenPLC (Docker:
docker pull openplc/opcua_server) and FactoryIO. - Practice with Metasploit’s modbus auxiliary modules: `use auxiliary/scanner/scada/modbusdetect` and
use auxiliary/admin/scada/modbus_command. - Join the newsletter (7,400+ subscribers) to get weekly curated infographics and job postings.
What Undercode Say:
- Key Takeaway 1: Free visual resources can collapse years of learning into hours – Mike Holcomb’s vault is a must-bookmark for any OT/ICS professional.
- Key Takeaway 2: GenAI prompts embedded in the vault allow even non-programmers to generate defensive scripts, bridging the gap between theory and automation.
Analysis: The OT/ICS security field suffers from a lack of accessible, practical training. Most resources are expensive and vendor-locked. This free collection democratizes knowledge by presenting complex concepts (e.g., zone conduits, SIS loops, ARP spoofing in OT) as digestible infographics. Moreover, including GenAI prompts is forward-thinking – it reduces friction for defenders to create custom detection rules. However, users must remember that infographics alone do not replace hands-on lab practice. Pairing the vault with the free video series and the newsletter’s ongoing updates creates a continuous learning loop. The emphasis on tools like nmap, tcpdump, and Modbus-specific commands ensures that readers can immediately test concepts in safe environments.
Prediction:
As OT/ICS cyber threats (e.g., ransomware targeting PLCs, state-sponsored attacks on energy grids) escalate, community-driven free resources will become the primary upskilling method for defenders. The integration of GenAI prompts will evolve into fully automated playbook generators, allowing small teams to deploy enterprise-grade monitoring. Within 18 months, similar “vaults” will emerge for 5G industrial IoT and cloud SCADA, and professionals who master these visual+AI hybrid resources will lead incident response in critical sectors. Expect employers to shift hiring filters from formal certifications to demonstrated use of such curated open-source toolkits.
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Reported By: Mikeholcomb Ive – Hackers Feeds
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