Beyond the Screen: How Digital Twins and XR Are Changing Industrial Security Testing

TLDR: Researchers at PNNL are using Extended Reality (XR) and digital twins to create high-fidelity, interactive simulations of critical infrastructure for security testing. By integrating Unity with 3D-capture tools like Depthkit, they can model complex industrial systems and test them against red-team scenarios without risking physical assets. This approach allows security teams to practice exploiting industrial control systems (ICS) in a safe, repeatable, and immersive environment.

Security researchers often hit a wall when testing critical infrastructure. You cannot just run an aggressive vulnerability scan against a nuclear waste management system or a live power grid. The risk of causing a physical failure is too high, and the cost of downtime is astronomical. This is why the work presented at DEF CON 2024 regarding the use of Extended Reality (XR) for industrial security testing is a significant shift in how we approach red-teaming for high-stakes environments.

Instead of relying on static network diagrams or limited simulations, the team at Pacific Northwest National Laboratory (PNNL) is building "skids"—physical, scaled-down models of industrial systems—and pairing them with digital twins. This setup allows a researcher to interact with a virtual representation of a system while the underlying logic remains grounded in real-world hardware.

The Mechanics of the Digital Twin

The core of this research is the ability to bridge the gap between a virtual environment and physical hardware. By using Unity as the primary engine, the team can script complex scenarios where a user interacts with a 3D model of a system. When a user performs an action in the XR space—like turning a valve or modifying a PLC register—the system reflects that change in the physical skid.

This is not just about visualization. It is about creating a sandbox where the consequences of an exploit are visible and immediate. For a pentester, this means you can test how a specific payload affects a process control loop without needing access to the production environment. You are essentially performing a man-in-the-middle attack on a digital twin that is tethered to a real, albeit scaled, industrial controller.

The integration of Depthkit is what makes this truly powerful. It allows for real-time 3D capture of the physical skid, which is then projected into the XR environment. This creates a seamless experience where the user can see the physical hardware they are manipulating, even while wearing a headset like the Meta Quest 3 or a Varjo XR-3.

Why This Matters for Pentesters

If you are a researcher or a pentester working in the ICS space, the primary challenge is the lack of access to target hardware. Most engagements are limited to passive reconnaissance or testing the IT-OT gateway. This XR-based approach changes the engagement model. It allows for the development of "attack scenarios" that can be shared and refined.

Imagine a scenario where you are testing for unauthorized command injection in a water treatment system. In a traditional engagement, you might be limited to analyzing packet captures. With this XR setup, you can see the physical impact of your command injection—perhaps a tank overflowing or a pump shutting down—in a simulated environment that behaves exactly like the real thing.

The use of standard controllers, such as an Xbox controller, to manipulate these systems in the XR space is a clever touch. It lowers the barrier to entry for operators and researchers alike, making it easier to conduct red-team exercises that focus on human-machine interface (HMI) vulnerabilities.

The Defensive Perspective

For blue teams, this technology is a game-changer for incident response training. Instead of reading through a static incident report, operators can be placed into an immersive simulation of an active shooter event or a chemical leak. They can practice their response protocols in a high-stress, realistic environment.

Defenders should look at this as a way to validate their security controls. If you have an intrusion detection system (IDS) configured to monitor for specific ICS protocols, you can use these XR simulations to generate the traffic patterns associated with an attack and verify that your alerts trigger as expected. It is the ultimate form of "purple teaming"—where the red team's exploits are immediately visible to the blue team's monitoring tools.

Looking Ahead

The future of this research lies in scaling. As the team at PNNL continues to build out more skids for different systems—like power substations and maritime ports—the library of available attack scenarios will grow. The integration of AI for real-time data analysis is the next logical step. By feeding the telemetry from these XR sessions into an AI model, researchers can identify subtle patterns in operator behavior or system response that might indicate a compromise.

If you are working in the security research space, keep an eye on how these immersive technologies evolve. The ability to simulate complex, physical systems in a virtual space is no longer a niche capability. It is becoming a standard requirement for anyone serious about securing the infrastructure that keeps the world running. The next time you are looking for a way to test a complex exploit, ask yourself if you can build a digital twin for it. The tools are already here.