Best GitHub Repos to Learn OT/ICS Cybersecurity for FREE!

Virtual Lab Environments

1. GRFICS – Home of the Graphical Realism Framework for Industrial Control Simulation.
2. OT/ICS Virtual Lab – Learn defensive and offensive OT/ICS cybersecurity.

Packet Captures

1. OT Protocol PCAPs – Modbus, Profinet, and more.
2. More OT/ICS PCAPs – Additional protocol captures for analysis.

Penetration Testing Tools

1. OT Pentesting Tools – Extensive collection of ICS/OT security tools.
2. ICS Security Tools – Another great resource for pentesting.

Honeypots

1. Conpot ICS Honeypot – Popular open-source ICS honeypot.
2. T-Mobile ICS Honeypot – Another great option for deception security.

Other Resources

• UtilSec OT/ICS Learning – Additional guides and materials.

You Should Know:

1. Setting Up Conpot Honeypot

git clone https://github.com/mushorg/conpot.git 
cd conpot 
pip install -r requirements.txt 
python conpot/bin/conpot --template default 

– Modify `conpot/config/conpot.xml` for custom ICS device simulations.

2. Analyzing OT PCAPs with Wireshark

wireshark -r modbus.pcap -Y "modbus" 

– Use filters like `modbus.func_code == 6` to detect write operations.

3. GRFICS Lab Setup (Docker)

docker pull grfics/grfics 
docker run -it -p 8080:80 grfics/grfics 

– Access via `http://localhost:8080` to simulate industrial environments.

4. ICS Protocol Fuzzing with Kali

sudo apt install icsfuzz 
icsfuzz -i eth0 -p modbus -t 192.168.1.100 

5. Detecting ICS Malware with YARA

yara -r /path/to/malware ICS_Malware_Rules.yar 

What Undercode Say:

OT/ICS security requires hands-on practice. Use these labs to:
– Simulate attacks on PLCs using plcscan.
– Detect anomalies with snort -c /etc/snort/ics.rules.
– Harden systems via `iptables -A INPUT -p tcp –dport 502 -j DROP` (block Modbus).
– Automate scans with nmap -Pn -sS -p 1-1024 --script modbus-discover.nse.
– Log analysis via journalctl -u scada-service --no-pager.

Expected Output:

Starting Conpot ICS honeypot... 
Modbus traffic detected in PCAP. 
GRFICS lab running at http://localhost:8080. 

Explore these repos, practice commands, and secure critical infrastructure!

References:

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