Security Incident Response and Operations Questions

Covers the practices, processes, and tooling for responding to security incidents and operating a security capability. Topics include the security incident lifecycle of preparation, detection, analysis, containment, eradication, recovery, and post incident review; development and execution of playbooks and runbooks tailored to threat types; severity classification and decision criteria for escalation; evidence preservation and forensic analysis and chain of custody; crisis communication to stakeholders and regulators; notification and regulatory compliance considerations; and coordination with legal, privacy, communications, and executive leadership. Also includes operational aspects of building and staffing a security operations center, on call schedules and escalation, ticketing and case management, leadership and coordination during major incidents, running blameless post incident reviews to identify systemic improvements, and integration of security incident learnings into engineering and operations.

HardSystem Design

67 practiced

Design a tamper-evident, immutable evidence store for enterprise incident artifacts (logs, disk images, memory dumps). Requirements: handle 5 PB retention, support legal holds, enforce granular access control, provide cryptographic integrity proofs, efficient retrieval for investigators, and cost estimates. Sketch components and KMS usage.

HardTechnical

61 practiced

Implement a memory scanner in Python that scans a large memory dump file for multiple indicators of compromise (IOC) such as SHA256 hashes, IP addresses, and regex patterns, and streams results to minimize memory usage. Describe how you handle patterns that cross chunk boundaries and provide complexity analysis.

HardTechnical

68 practiced

Design an algorithm to prioritize SOC alerts using available metadata: CVE score, asset criticality, estimated blast radius, time since detection, and current analyst load. Describe the scoring model, how you would train or tune it, and metrics to evaluate that prioritization reduces expected business impact.

HardTechnical

75 practiced

Describe cryptographic attestation strategies to ensure integrity of forensic artifacts ingested into an evidence pipeline: compare using HMACs with managed keys, signed manifests, Merkle trees for batching, and how to rotate keys while maintaining verifiability. Discuss trust anchors and trade-offs for verification performance versus storage overhead.

EasyTechnical

71 practiced

You are on-call and receive a pager indicating a sudden spike of 500 errors in a critical microservice. Describe your triage process step by step: what logs and metrics do you inspect first, how do you determine if this is a security incident versus a bug, and what containment actions might you take while preserving evidence?

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