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Interview question · Detection Engineering & Incident Response

How do you triage a suspicious file safely, and how would you write a YARA rule that catches its family without false positives?

Hash lookups catch yesterday's file. A good rule targets what the family cannot easily change, and gets tested against a corpus of clean files before anyone trusts it.

mediumEssentialNewPreparation tags: CrowdStrike, Palo Alto Networks, GoogleUpdated Nov 2026

Hash lookups catch yesterday's file. A good rule targets what the family cannot easily change, and gets tested against a corpus of clean files before anyone trusts it.

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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 6 follow-ups like an interviewer would

A user reports a suspicious attachment, and you must triage it and help the team detect similar files across email and endpoints.

  1. Where should the sample be handled?
  2. What does static triage cover?
  3. When would you detonate it in a sandbox?
  4. What do you do with the indicators?
  5. How do you write a good YARA rule?
  6. How would you triage and build detection?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
Next in this trackDesign a security telemetry pipeline for millions of events per second that supports detection and survives an attacker.Next in this trackPractical coding: find the top source IPs in an auth log, then do it again for an unbounded stream with fixed memory.Next in this trackHow do you run a post-incident review that actually changes things, without turning it into blame?
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