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If you’re interested in ICS/OT (Industrial Control Systems/Operational Technology) cybersecurity, Mike Holcomb’s YouTube series and live classes are highly recommended. The next session focuses on Pentesting for ICS, a critical skill for securing critical infrastructure.
You Should Know: Essential ICS/OT Pentesting Commands & Techniques
1. Network Discovery in ICS/OT Environments
Before pentesting, identify ICS devices:
nmap -sV --script vulners -p 1-1024 <target_IP>
For Modbus protocol detection:
nmap -p 502 --script modbus-discover <target_IP>
2. Exploiting ICS Protocols
Use Metasploit for SCADA exploits:
msfconsole use exploit/windows/scada/moxa_mdmtraversal set RHOSTS <target_IP> exploit
3. PLC Manipulation (Siemens S7)
Using Python with Snap7:
import snap7
client = snap7.client.Client()
client.connect('192.168.1.10', 0, 1)
data = client.db_read(1, 0, 10)
print(data)
4. ICS Firewall Bypass Techniques
Check for default credentials on HMI panels:
hydra -l admin -P /usr/share/wordlists/rockyou.txt <target_IP> http-post-form "/login.php:user=^USER^&pass=^PASS^:F=incorrect"
5. Detecting Vulnerable ICS Services
Search for Shodan-exposed ICS devices:
shodan search port:502,44818,1911 "Siemens"
6. Defending ICS/OT Systems
- Disable unused protocols (DNP3, Modbus TCP if not needed).
- Patch management:
opcua-client --security-mode=SignAndEncrypt --endpoint="opc.tcp://<IP>:4840"
What Undercode Say
Securing ICS/OT requires a mix of offensive testing and defensive hardening. Always:
– Segment OT networks from IT.
– Monitor for abnormal traffic:
tcpdump -i eth0 'port 502 or port 44818' -w ot_traffic.pcap
– Use ICS-aware SIEMs (e.g., Tenable.ot, Nozomi Networks).
– Test backups regularly with:
rsync -avz /opt/plc_backups/ backup_server:/secure_archive/
For hands-on training, follow Mike Holcomb’s upcoming Pentesting for ICS course.
Expected Output:
A hardened ICS network with monitored protocols, patched PLCs, and segmented OT traffic.
Relevant URLs:
- Mike Holcomb’s YouTube (hypothetical link, replace with actual)
- BSides ICS 2026 (hypothetical link)
References:
Reported By: Korinnemjackman Icscybersecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
