performing-ot-vulnerability-scanning-safely

name	performing-ot-vulnerability-scanning-safely
description	Perform vulnerability scanning in OT/ICS environments safely using passive monitoring, native protocol queries, and carefully controlled active scanning with Tenable OT Security to identify vulnerabilities without disrupting industrial processes or crashing legacy controllers. . Use when working with performing ot vulnerability scanning safely.
domain	cybersecurity
tags	["ot-security","ics","vulnerability-scanning","tenable","nessus","passive-scanning","risk-management","nist"]
subdomain	ot-ics-security
version	1.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.IR-01","DE.CM-01","ID.AM-05","GV.OC-02"]

Performing Ot Vulnerability Scanning Safely

Overview

Cybersecurity skill for performing ot vulnerability scanning safely. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "performing ot vulnerability scanning safely"

• "Perform vulnerability scanning in OT/ICS environments safely using passive monit"

• When conducting vulnerability assessments in OT environments with legacy controllers

• When implementing continuous vulnerability monitoring without impacting process availability

• When preparing for IEC 62443 or NERC CIP compliance audits requiring vulnerability data

• When evaluating risk-based patching priorities for OT assets

• When validating that compensating controls protect unpatched ICS devices

Do not use for aggressive active scanning of production PLCs (can crash legacy controllers), for IT vulnerability scanning using standard Nessus profiles on OT networks, or for penetration testing of live OT systems (see performing-ics-penetration-testing).

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

• Tenable OT Security (formerly Tenable.ot/Indegy) or equivalent OT-safe scanning platform
• Passive monitoring sensor deployed on SPAN/TAP at OT network segments
• Lab-tested scanning profiles verified against each device type before production use
• Change management approval and maintenance window for any active scanning
• Vendor warranty verification to confirm scanning will not void support agreements

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()}