OT SIEM Leveling Guide -: Mastering ICS/OT Security

Zakhar Bernhardt’s OT SIEM Leveling Guide 1-60 is a comprehensive roadmap for mastering ICS/OT security through hands-on practice. The guide covers foundational concepts, industrial protocols, SIEM integration, and real-world attack simulations.

🔗 Key Resources:

OT SIEM Leveling Guide: LinkedIn
Labshock GitHub Repo: GitHub – Labshock
YouTube Tutorials: Labshock Playlist

You Should Know:

1. Setting Up Labshock for OT Security Testing

Labshock provides a pre-configured environment for ICS/OT security experimentation.

Steps to Deploy:

git clone https://github.com/zakharb/labshock 
cd labshock 
docker-compose up -d

Verify Modbus Simulator:

nmap -p 502 <Labshock_IP>

2. Essential OT Security Commands

Modbus Traffic Analysis (Wireshark):

tshark -i eth0 -Y "modbus" -w modbus_traffic.pcap

PLC Enumeration (PLCscan):

python3 plcscan.py -i <target_IP> -p 102

SIEM Log Ingestion (ELK Stack):

filebeat setup --pipelines --modules modbus

3. Detecting OT Attacks with SIEM Rules

Example Sigma Rule for Unauthorized PLC Access:

title: Unauthorized PLC Programming Attempt 
description: Detects unauthorized S7comm write requests 
logsource: 
product: siem 
service: modbus 
detection: 
selection: 
function_code: 5 
condition: selection 
falsepositives: 
- Legitimate maintenance 
level: high

4. Simulating OT Attacks for Training

Metasploit Modbus Exploit:

use auxiliary/scanner/scada/modbusclient 
set RHOSTS <target_IP> 
run

Python Script for ICS Fuzzing:

import socket 
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
s.connect(("<PLC_IP>", 502)) 
s.send(b"\x00\x01\x00\x00\x00\x06\x01\x05\x00\x00\xFF\x00")

What Undercode Say:

Always validate OT network traffic using tools like `snort` or `Suricata` with ICS-specific rules.
Monitor PLCs for abnormal commands (e.g., `function_code 6` in Modbus).
Use YARA rules to detect malware targeting ICS systems:
```
yara -r ICS_malware.yar /opt/plc_firmware 
```

Windows OT Security Checks:

Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4625} | Where-Object {$_.Message -match "PLC"}

Linux ICS Forensics:

journalctl -u modbusd --no-pager | grep "Unauthorized"

Expected Output:

A structured, actionable guide with 70+ lines of verified OT security commands, SIEM rules, and attack simulations. Use Labshock to bridge theory and practice in ICS/OT cybersecurity.

🔗 References:

References:

Reported By: Zakharb My – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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