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Your EDR is not the problem

Endpoint platforms are authoritative about what happened on a machine, and they are being asked a question they were never designed to answer.

AS

Aurelien Schlumberger

3 min read

There is a familiar move in security marketing where a new category arrives by declaring the previous one broken. It is usually wrong, and in the case of endpoint detection it is badly wrong. Falcon and its peers do something genuinely hard, extremely well: they reconstruct what happened on a machine, down to the process tree and the command line, and they will tell you with confidence.

The trouble starts when that capability gets pointed at a question of a different shape.

Two different questions

What happened on this host is a host question. It has a definite answer, and an agent on that host is the right instrument for it.

Which hosts are involved, in what order, controlled from where is not a host question at all. It is a question about relationships, and no amount of per-host fidelity composes into it. An analyst ends up reconstructing it by hand, across consoles, after the fact � which is slow, and which is why it usually happens only once the incident is already known.

Leading from the network

The useful arrangement is not one replacing the other, and it is not a dashboard showing both side by side. It is an order of operations.

  1. The network observes passively and continuously, keeping precise timing
  2. Weak endpoint signals and network behaviour accumulate in one correlation layer, each raising confidence in the other
  3. Past a threshold, the chain is reconstructed across every hop � agent or not
  4. The channel is cut while the investigation continues
  5. The EDR is directed at only the hosts in the chain, inside the exact window, to attribute processes
  6. Endpoint findings return as evidence, into one campaign investigation

The endpoint stops being the place you go hunting, and becomes the instrument you aim.

Nothing in that sequence diminishes the endpoint platform. It removes the part of the job it was never suited to � searching hundreds of machines for activity whose significance only exists in aggregate � and gives it a narrow, well-posed question instead.

What this looks like in practice

Telemetry and detections stream continuously into the correlation Fabric. Real Time Response is dispatched against the hosts in the reconstructed chain and no others, with the time window pre-set from the network observation. Scan results and RTR output are written back into the case and the device ticket, so the record is chronological rather than scattered.

Containment stays under policy. High-confidence worm-like behaviour on a workstation can be contained automatically; a production server can be blocked from automatic containment outright, whatever the confidence score says. That distinction is not a nicety � in the environments this runs in, it is the difference between a security control and an outage.

The full integration detail lives on the EDR integration page.

Written by

AS

Aurelien Schlumberger

Nodal Technologies

Team

Published 3 min read

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See it work

Watch a chain assemble itself.

The fastest way to understand any of this is to see the console reconstruct a four-hop path on sanitised data.