The Visibility Gap No One Likes to Admit

Your SIEM ingests billions of events.
Your EDR coverage is close to 100%.

But the traffic between PLCs, HMIs, historians, and controllers often generates no usable logs for your SOC.

Industrial protocols were not designed for modern security monitoring. When something moves laterally from IT into OT, your team is often reconstructing events manually from packet captures, under time pressure, with limited protocol expertise.

That is not a minor tooling gap. It is a blind spot in the architecture.

As IT and OT continue to converge, and regulatory pressure increases under frameworks like NIS2 and IEC 62443, that blind spot becomes harder to justify.

What NANO Does Differently

NANO captures every packet on your industrial network and feeds it to MAIA, an investigation engine built to interpret OT protocols.

Deployment is passive:

• No agents on PLCs or controllers
• No changes to control systems
• No operational disruption

The probe performs lossless capture at linerate and deeply decodes industrial protocols including:

• Modbus
• Profinet
• OPC-UA
• DNP3

This is not sampled flow data. It is full protocol context.

From Traffic to Investigation

1. Sense — Passive, Full-Fidelity Capture

The NANO probe observes industrial traffic via TAP or SPAN.

It captures:

• PLC-to-PLC communication
• Controller-to-historian exchanges
• Configuration writes and control commands

Without impacting operations.

2. Reason — Protocol-Level Interpretation

Most OT monitoring tools focus on anomaly detection. They highlight deviations from a baseline.

MAIA goes further by interpreting protocol semantics.

It can determine:

• Which Modbus registers were written
• Whether a Profinet configuration change aligns with maintenance patterns
• Whether DNP3 command behavior resembles telemetry or manipulation

It distinguishes legitimate operational changes from suspicious activity and explains why.

The output is not a generic alert.
It is a structured investigation.

3. Resolve — Direct to Your SIEM

Findings are delivered into existing platforms such as:

• Splunk
• Microsoft Sentinel
• CrowdStrike Falcon

Through API integration, your SOC receives:

• Evidence-backed findings
• Clear severity assessment
• Context tied to operational impact
• Recommended next steps

No new console. No separate workflow.

What Changes Operationally

Without dedicated OT visibility, PLC traffic is largely invisible, alerts arrive without protocol context, and incidents often require OT specialists to manually interpret packet captures. IT and OT security operate in parallel, and meaningful forensic reconstruction can take days. With NANO in place, industrial conversations are decoded in full, investigations include command-level detail, SOC teams can triage using structured findings, visibility spans both IT and OT domains, and evidence is available immediately instead of after a prolonged reconstruction effort.

A Practical Example

If a PLC begins communicating with a historian outside its normal pattern:

Today, this may go unnoticed or appear as ambiguous traffic.

With NANO, the Modbus exchange is decoded, register access analyzed, and behavior compared to baseline activity. If the pattern resembles reconnaissance or unauthorized configuration staging, the SOC receives a contextualized finding with supporting evidence.

Investigation time is reduced significantly because the protocol analysis is already done.

Compliance and Evidence

Continuous, high-fidelity capture supports regulatory and framework requirements including:

• NIS2
• IEC 62443
• NERC CIP
• ISO 27019

Instead of relying on indirect logs, you maintain an auditable record of actual industrial network activity.

The Strategic Question

If a critical control command is issued on your OT network tonight, will your SOC understand what happened?

If the answer depends on manual packet analysis and specialist intervention, the gap is architectural.

Contact your SIEM provider. Ask how they handle deep OT protocol visibility.

Then ask about integrating NANO.

Because industrial traffic does not explain itself.

‍