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Interview question · Detection Engineering & Incident Response

How does an EDR agent work, and what did the July 2024 CrowdStrike outage teach about running security software in the kernel?

EDR sees so much because it runs with so much privilege. On 19 July 2024 that privilege turned one bad content file into millions of crashed Windows machines. The answer covers both halves.

mediumNewPreparation tags: CrowdStrike, Microsoft, Palo Alto NetworksUpdated Nov 2026

EDR sees so much because it runs with so much privilege. On 19 July 2024 that privilege turned one bad content file into millions of crashed Windows machines. The answer covers both halves.

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What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 4 follow-ups like an interviewer would

You are the security lead at a company with 40,000 Windows machines and an EDR that pushes detection content several times a day. After the 2024 outage, leadership asks how to keep protection without risking a fleet-wide crash.

  1. What exactly went wrong in July 2024?
  2. What do you ask the EDR vendor?
  3. What do you change in your own environment?
  4. What is the balanced position?

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