Performing ICS Asset Discovery with Claroty

When to Use

• When gaining initial visibility into an OT environment with unknown or poorly documented assets
• When preparing for an IEC 62443 risk assessment requiring a complete asset inventory
• When onboarding Claroty xDome into a brownfield industrial environment
• When validating existing asset inventory against actual network communications
• When identifying shadow OT devices or unauthorized connections in the control network

Do not use for IT-only asset discovery (use tools like Nessus or Qualys), for active scanning of sensitive PLC networks without vendor approval, or for environments where Claroty is not the deployed platform (see implementing-ot-network-traffic-analysis-with-nozomi).

Prerequisites

• Claroty xDome SaaS subscription or on-premises deployment
• Network TAP or SPAN port configured at OT network boundaries (Levels 1-3 of Purdue Model)
• Claroty Edge collector deployed for safe active querying of hard-to-reach network segments
• Integration credentials for CMDB tools (ServiceNow, BMC) if used
• Network architecture diagram showing VLANs, switches, and firewall zones

Workflow

Step 1: Configure Passive Network Monitoring

Deploy Claroty sensors on SPAN ports to passively observe all OT network traffic without impacting operations.

#!/usr/bin/env python3
"""Claroty xDome Asset Discovery Configuration and Reporting Tool.

Automates the configuration of passive monitoring sensors and generates
asset inventory reports from Claroty xDome API.
"""

import json
import sys
import csv
from datetime import datetime
from typing import Optional

try:
    import requests
except ImportError:
    print("Install requests: pip install requests")
    sys.exit(1)


class ClarotyAssetDiscovery:
    """Interface with Claroty xDome API for ICS asset discovery."""

    def __init__(self, base_url: str, api_token: str, verify_ssl: bool = True):
        self.base_url = base_url.rstrip("/")
        self.session = requests.Session()
        self.session.headers.update({
            "Authorization": f"Bearer {api_token}",
            "Content-Type": "application/json",
            "Accept": "application/json",
        })
        self.session.verify = verify_ssl

    def get_sites(self):
        """Retrieve all monitored sites."""
        resp = self.session.get(f"{self.base_url}/api/v1/sites")
        resp.raise_for_status()
        return resp.json().get("sites", [])

    def get_assets(self, site_id: Optional[str] = None, asset_type: Optional[str] = None):
        """Retrieve discovered assets with optional filtering.

        asset_type: PLC, RTU, HMI, DCS, Engineering_Workstation,
                    Historian, Network_Device, IO_Module, Safety_Controller
        """
        params = {}
        if site_id:
            params["site_id"] = site_id
        if asset_type:
            params["type"] = asset_type

        resp = self.session.get(f"{self.base_url}/api/v1/assets", params=params)
        resp.raise_for_status()
        return resp.json().get("assets", [])

    def get_asset_detail(self, asset_id: str):
        """Retrieve detailed asset information including firmware, modules, and CVEs."""
        resp = self.session.get(f"{self.base_url}/api/v1/assets/{asset_id}")
        resp.raise_for_status()
        return resp.json()

    def get_communication_map(self, site_id: str):
        """Retrieve communication relationships between assets."""
        resp = self.session.get(
            f"{self.base_url}/api/v1/sites/{site_id}/communications"
        )
        resp.raise_for_status()
        return resp.json().get("communications", [])

    def get_vulnerabilities(self, site_id: Optional[str] = None, severity: str = "critical"):
        """Retrieve vulnerabilities for discovered assets."""
        params = {"min_severity": severity}
        if site_id:
            params["site_id"] = site_id

        resp = self.session.get(f"{self.base_url}/api/v1/vulnerabilities", params=params)
        resp.raise_for_status()
        return resp.json().get("vulnerabilities", [])

    def export_asset_inventory(self, output_file: str, site_id: Optional[str] = None):
        """Export full asset inventory to CSV for compliance reporting."""
        assets = self.get_assets(site_id=site_id)
        if not assets:
            print("[!] No assets found")
            return

        fieldnames = [

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