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Want to know more about ICS/OT cybersecurity? Here are the top 10 posts from April, including free courses, GitHub repos, certifications, and critical insights into industrial control systems security.
- Free ICS/OT Knowledge Resources
- Why 98% of Companies Struggle with ICS/OT Security
- Overcoming Challenges in OT/ICS Cybersecurity
- Cybersecurity Networking at 45
- Why No OT/ICS Network is 100% Secure
- Level Up Your OT/ICS Cybersecurity Skills
- What a Hacked OT/ICS System Looks Like
- Free 25-Hour OT/ICS Cybersecurity Course
- 8 Best GitHub Repos for OT/ICS Cybersecurity
- OT/ICS Certifications to Boost Your Career
You Should Know: Essential ICS/OT Cybersecurity Commands & Practices
Network Security Scanning
1. Nmap for ICS Devices
nmap -sT -Pn -p 1-1024 --script vulners <OT_IP_Range>
Scans for open ports and vulnerabilities in ICS systems.
2. Wireshark for OT Traffic Analysis
wireshark -k -i eth0 -Y "modbus || dnp3 || ethernet/ip"
Filters industrial protocols (Modbus, DNP3, Ethernet/IP).
3. Detecting Anomalies with Zeek (Bro)
zeek -i eth0 -C local "Site::local_nets += { 192.168.1.0/24 }"
Monitors network traffic for suspicious ICS behavior.
Windows ICS Security Hardening
4. Disable Unnecessary Services
Stop-Service -Name "WinRM" -Force Set-Service -Name "WinRM" -StartupType Disabled
Reduces attack surface in Windows-based OT systems.
5. Enable Logging for Critical ICS Events
wevtutil sl Microsoft-Windows-PowerShell/Operational /e:true
Tracks PowerShell-based attacks in ICS environments.
6. Restrict USB Devices (Prevent Stuxnet-like Attacks)
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\USBSTOR" -Name "Start" -Value 4
Disables USB storage to prevent malware infections.
Linux-Based ICS Security
7. Audit ICS System Logs
sudo auditctl -a always,exit -F arch=b64 -S execve -k ICS_Process_Tracking
Tracks process execution in Linux ICS servers.
8. Secure ICS Firewall Rules (UFW)
sudo ufw allow from 192.168.1.0/24 to any port 502 proto tcp sudo ufw deny all
Only allows Modbus TCP (port 502) from trusted OT networks.
9. Detect Unauthorized ICS Changes (Tripwire)
sudo tripwire --check
Monitors critical ICS files for tampering.
10. ICS-Specific Vulnerability Scanning
sudo openvas-scanner --target=192.168.1.100 --scan-config="ICS_SCADA"
Runs OpenVAS with ICS-specific checks.
What Undercode Say
ICS/OT cybersecurity requires specialized knowledge due to legacy systems, proprietary protocols, and high-risk environments. Key takeaways:
– Network Segmentation is critical (iptables, ufw).
– Logging & Monitoring (auditd, Zeek, Wireshark) prevents breaches.
– Patch Management is often manual in OT (yum --security update).
– Physical Security (USB restrictions, BIOS passwords).
– Certifications (GISCP, GRID) validate expertise.
Always test commands in a lab before deploying in production OT environments.
Expected Output:
A structured guide on ICS/OT cybersecurity resources, practical commands, and hardening techniques for both Windows and Linux-based industrial systems.
References:
Reported By: Mikeholcomb Want – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
