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ECCouncil 312-39 (Certified SOC Analyst) Practice Test 20

Question 190

A chief information security officer requests a monthly SOC review. What mix of information is most actionable?

  1. Every raw authentication event from every workstation
  2. Only the number of analysts who visited the SOC console
  3. Only the total number of alerts with no false-positive qualification
  4. Report confirmed impact, response times, and detection gaps

Explanation

Correct Answer

D:

Executive reporting should connect operational outcomes with business risk and improvement commitments, not merely display tool activity.

Incorrect Answers

A:

An unfiltered log dump overwhelms the intended audience and lacks synthesized risk or operational interpretation.

B:

Console visits are not a reliable indicator of incident impact, containment success, or coverage improvement.

C:

Raw alert volume can rise because of rule noise or ingestion changes and may misrepresent actual threats.

Question 191

A Tier 2 responder needs a case report that allows another analyst to validate findings. Which format is most appropriate?

  1. Only a list of product names used by the SOC
  2. Only a single sentence declaring the threat actor sophisticated
  3. Only an incident severity score without an explanation
  4. A time-ordered, evidence-backed account of observed actions

Explanation

Correct Answer

D:

Reproducible reports separate facts from hypotheses and enable follow-up actions without relying on the original investigator's memory.

Incorrect Answers

A:

Tool inventory does not explain what happened, what evidence supports it, or how response decisions were reached.

B:

An adjective provides neither defensible evidence nor scope, making independent validation impossible.

C:

A score is a conclusion; the report must document why it was assigned and which observations support it.

Question 192

A dashboard shows phishing incidents falling immediately after a mail gateway rule change, but user-reported phishing rises. What should the team investigate?

  1. Report success without checking ingestion or definitions
  2. Assume the decrease proves phishing was eliminated
  3. Delete user reports because the dashboard is authoritative
  4. Compare email volume with classification and ingestion gaps

Explanation

Correct Answer

D:

Contradictory measures may indicate suppressed alerts, changed reporting, or successful evasion rather than a genuine reduction in threats.

Incorrect Answers

A:

Metric definitions and source completeness must be validated before claiming that a control change reduced risk.

B:

One data series cannot establish elimination when an independent reporting source shows a conflicting pattern.

C:

User submissions are potentially useful evidence and can reveal false negatives in automated filters.

Question 193

An analyst wants to find which ten source hosts generated the most failed VPN logins today. Which visualization provides an effective first view?

  1. A timeline with all security events aggregated into one undifferentiated line
  2. A ranked table or bar chart grouped by source host with failed-login counts
  3. A pie chart of installed endpoint operating-system versions
  4. A map of office locations without authentication counts

Explanation

Correct Answer

B:

Ranking highlights concentration and supports pivoting to accounts, times, and authentication outcomes for suspicious sources.

Incorrect Answers

A:

Global event volume hides the per-source ranking needed to locate concentrated failed-login activity.

C:

OS inventory categories do not answer which VPN sources generated authentication failures today.

D:

Office geography alone does not show which hosts are generating the highest number of VPN failures.

Question 194

A SIEM detection is ready for production. How should the engineer check that it identifies the intended behavior and excludes normal operations?

  1. Inspect only the visual style of its incident ticket
  2. Deploy directly to all sources and assume vendor sample rules never need tuning
  3. Measure only query execution speed without checking matches
  4. Run labeled true and false test cases against realistic events

Explanation

Correct Answer

D:

Validation should exercise true attack patterns, expected administrative lookalikes, parser fields, and scheduling windows before deployment.

Incorrect Answers

A:

Presentation quality does not establish that event logic correctly matches the intended threat behavior.

B:

Environment-specific logs and expected activity vary, so untested rules can miss events or flood analysts.

C:

A fast rule can still be ineffective if it returns false positives or fails genuine attack samples.

Question 195

A Sigma YAML rule describes a Windows event pattern, and the SOC wants to run it in a specific SIEM. What must be verified?

  1. Verify mapped fields and equivalent rule semantics after conversion
  2. Field parsing can be skipped because any string matching is equivalent
  3. The Sigma rule includes complete host memory for malware analysis
  4. Every SIEM interprets Sigma YAML natively without translation

Explanation

Correct Answer

A:

Sigma expresses portable detection intent, but backend syntax and available telemetry determine whether the converted rule works correctly.

Incorrect Answers

B:

A field-aware analytic can change meaning when names, case sensitivity, or event sources do not align.

C:

Log rules describe matching conditions and do not embed volatile-memory evidence from affected endpoints.

D:

Most backends need conversion or integration; portable rule definitions are not universally executable as-is.

Question 196

A detection rule produces known false positives from an approved installer. Which Sigma-related adjustment might be appropriate?

  1. Delete the logsource definition so the rule applies to every event type
  2. Change the title to contain the word filtered
  3. Write the installer name only in the falsepositives description and assume filtering happens automatically
  4. Introduce a scoped condition or filter excluding the verified installer context

Explanation

Correct Answer

D:

A narrow filter in detection logic can tune actual matches, whereas merely documenting false positives does not suppress them.

Incorrect Answers

A:

Removing source specificity makes the detection less controlled and may cause broad unintended matches.

B:

Titles are descriptive metadata and do not alter what event combinations satisfy the rule.

C:

False-positive metadata informs analysts; it does not by itself change the Boolean detection condition.

Question 197

A SIEM search rule references process.command_line, but the endpoint collector provides only a process name. What should be done?

  1. Collect authorized command lines or redesign around available fields
  2. Increase the rule severity to compensate for the missing field
  3. Treat the process name as though it always contains full execution parameters
  4. Assume the SIEM invents command-line text from a process hash

Explanation

Correct Answer

A:

Analytics cannot match absent fields; collection prerequisites must be addressed before confidence is placed in the rule.

Incorrect Answers

B:

Severity labels do not create the absent telemetry or validate detection accuracy.

C:

An image basename does not preserve flags, arguments, and encoded payloads needed by command-line-focused logic.

D:

A cryptographic digest identifies bytes and cannot reliably reconstruct the arguments used for one process instance.

Question 198

A report states that 80% of alerts were malicious, but the team only investigated 20 out of 1,000 alerts. What is the reporting flaw?

  1. A higher percentage is always better regardless of investigation criteria
  2. The reported denominator and sampling limitations are not made explicit
  3. Every unreviewed alert must be malicious by definition
  4. The metric should instead be based on SIEM license cost alone

Explanation

Correct Answer

B:

A high positive rate among twenty reviewed alerts cannot automatically represent all one thousand, especially if review selection was severity-biased.

Incorrect Answers

A:

Metrics require reliable definitions and consistent sampling before they can guide decisions.

C:

Unknown disposition is not a confirmed true positive, so treating it as malicious inflates the result.

D:

License expense does not determine the share of alerts that investigation confirmed as genuine.

Question 199

An analyst uses a generative AI assistant to draft a SIEM query for suspicious service-account logins. What is required before production?

  1. Deploy without documenting the intended threat hypothesis
  2. Trust the output as accurate because it is fluent and well formatted
  3. Test rule logic and deploy changes through approved review
  4. Grant the assistant unrestricted access to all sensitive production logs

Explanation

Correct Answer

C:

AI-generated queries can reference nonexistent schema or produce overly broad exclusions, so a human engineer must validate the detection behavior.

Incorrect Answers

A:

Without an explicit objective and acceptance tests, the team cannot measure whether the generated logic is useful.

B:

Readable syntax does not guarantee correct event semantics or suitable false-positive handling.

D:

Developing a query does not inherently require bulk exposure of secrets or unbounded access to organization telemetry.

Question 200

An AI alert summarizer asserts that a cloud identity is compromised, but the cited sign-in events are routine. What should the analyst do?

  1. Verify AI summaries against raw evidence and correct unsupported claims
  2. Automatically accept the summary if it includes an ATT&CK label
  3. Disable the identity solely because the summary uses confident wording
  4. Delete the raw identity logs to avoid conflicting conclusions

Explanation

Correct Answer

A:

Generated interpretations can be mistaken; security decisions should rest on reproducible log observations and documented context.

Incorrect Answers

B:

Framework labels can also be misapplied and do not prove that the underlying event occurred or was malicious.

C:

Confidence of phrasing is not evidence of malicious activity and can cause disruptive false positives.

D:

Preserving source records allows validation and later review; deleting them would destroy the basis for assessment.

Certified SOC Analyst (312-39) Practice Tests