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Home - Lessons - CompTIA CySA+ (CS0-003) - M7 — Detection Engineering and Automation - False positive cost: measuring it and reducing it deliberately

CompTIA CySA+ (CS0-003) False positive cost: measuring it and reducing it deliberately

CompTIA CySA+ (CS0-003)

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M1 — Security Operations and Monitoring

Building a detection programme around what you can actually see

Log sources, normalisation and where blind spots come from

SIEM use cases: writing a rule that does not cry wolf

Alert triage: severity, urgency and the order you work

Tuning baselines so known-good traffic stops paging you

Metrics that mean something: MTTD, MTTR and alert fidelity

M2 — Threat Detection and Hunting

MITRE ATT&CK as a shared language for technique and coverage

Behavioural detection: what changed rather than what matched

Hypothesis-driven hunting versus indicator sweeps

Endpoint telemetry: process, network and persistence signals

Attacker lifecycle: initial access through to actions on objectives

Turning a hunt finding into a durable detection rule

M3 — Vulnerability Management

Scanning strategy: authenticated versus unauthenticated, and cadence

Scoring and context: why a raw CVSS number is not a priority

Asset criticality and exposure as the real prioritisation inputs

Exception, mitigation and risk acceptance as documented decisions

Retesting and proving a finding is actually closed

Reporting a remediation backlog that engineering will act on

M4 — Incident Response and Management

Preparation, detection, containment, eradication, recovery, lessons

Incident classification, escalation and the decision to declare

Evidence handling and the chain a report must survive

Containment trade-offs: speed against business disruption

Communication during an incident, including what not to say

Post-incident review that changes a control rather than a document

M5 — Reporting and Communication

Writing the technical report a peer can reproduce from

Executive summary that states impact, cause and action in a page

Visualising a kill chain so a non-specialist follows it

Indicators of compromise: what to share, with whom and when

Compliance reporting versus operational reporting

The exam’s expectations for written communication

M6 — Analyst Tooling in Practice

EDR workflow: isolate, investigate, remediate, document

Packet capture and protocol analysis for an alert

Threat intelligence feeds, enrichment and source reliability

SOAR playbooks for the repeatable half of triage

Ticketing discipline so an investigation survives handover

Building your own lab range to practise detections

M7 — Detection Engineering and Automation

Writing detections as code and reviewing them like code

False positive cost: measuring it and reducing it deliberately

Sigma-style rules and portable detection logic

Automating enrichment so the analyst sees context first

Purple-team validation: does the detection actually fire?

Versioning detections and retiring the ones nobody trusts

M8 — Capstone: Practice Exams and Exam-Day Strategy

A full timed practice exam under real conditions

Scoring by domain to separate knowledge gaps from reading errors

Performance-based question technique: read the whole scenario first

Working scenario questions where two answers look right

Exam-day time budget and review pass order

A two-week revision plan built from the domain scores

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