implementing-ot-network-traffic-analysis-with-nozomi

name	implementing-ot-network-traffic-analysis-with-nozomi
description	Deploy Nozomi Networks Guardian sensors for passive OT network traffic analysis to achieve comprehensive asset visibility, real-time threat detection, and vulnerability assessment across industrial control systems without disrupting operations, leveraging behavioral anomaly detection and protocol-aware monitoring. . Use when working with implementing ot network traffic analysis with nozomi.
domain	cybersecurity
tags	["ot-security","ics","nozomi","guardian","network-monitoring","asset-visibility","anomaly-detection","ndr"]
subdomain	ot-ics-security
version	1.0
author	oyi77
license	Apache-2.0
nist_ai_rmf	["MEASURE-2.7","MAP-5.1","MANAGE-2.4"]
atlas_techniques	["AML.T0070","AML.T0066","AML.T0082"]
nist_csf	["PR.IR-01","DE.CM-01","ID.AM-05","GV.OC-02"]

Implementing Ot Network Traffic Analysis With Nozomi

Overview

Cybersecurity skill for implementing ot network traffic analysis with nozomi. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "implementing ot network traffic analysis with nozomi"

• "Deploy Nozomi Networks Guardian sensors for passive OT network traffic analysis "

• When deploying passive OT network monitoring using Nozomi Networks Guardian sensors

• When requiring asset visibility without active scanning in sensitive ICS environments

• When building a Nozomi-based OT SOC with centralized management via Vantage or CMC

• When integrating OT network monitoring with Fortinet, Splunk, or ServiceNow ecosystems

• When monitoring compliance with IEC 62443 network segmentation policies

Do not use for active vulnerability scanning of OT devices (see performing-ot-vulnerability-scanning-safely), for environments standardized on Dragos (see implementing-dragos-platform-for-ot-monitoring), or for IT-only network monitoring.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Nozomi Networks Guardian sensor (hardware, VM, or container)
• Network TAP or SPAN port configured on monitored OT network segments
• Nozomi Vantage (cloud) or Central Management Console for multi-sensor management
• Nozomi Threat Intelligence subscription for updated detection signatures
• Network architecture documentation for sensor placement planning

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs() -> :
     {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}