ECCouncil 312-39 (Certified SOC Analyst) Practice Test 18

Question 170

An escalated incident case needs to remain actionable when ownership changes. What content should its analyst note preserve?

  1. Only an unstructured sentence saying the alert looks suspicious
  2. Only the final status without rationale or artifacts
  3. Record the investigation timeline, evidence, and open decisions
  4. Only the analyst's personal opinion of the detection vendor

Explanation

Correct Answer

C:

Structured case notes permit reproducible reasoning and show the next responder what was actually observed versus inferred.

Incorrect Answers

A:

A vague assessment omits supporting events, impacted systems, and the exact next decision.

B:

A status field cannot explain why a case was escalated or how another analyst should validate it.

D:

A vendor impression does not provide evidence or a defensible incident timeline.

Question 171

A SOC has received a high-priority data-exfiltration alert. Which sequence best supports controlled initial triage?

  1. Isolate all enterprise endpoints before opening the alert details
  2. Close the case and request more logs only if the user complains
  3. Publish a final incident report before examining evidence
  4. Validate alert evidence, confirm impact, and follow escalation rules

Explanation

Correct Answer

D:

This preserves evidence-based reasoning before selecting disruptive containment while keeping urgent actions tied to documented authority.

Incorrect Answers

A:

A global response is disproportionate without knowing source, destination, or affected scope and could disrupt unrelated services.

B:

Potential theft demands active validation; waiting for complaints is not a meaningful detection workflow.

C:

A final conclusion without analysis is unsupported and undermines subsequent response or legal review.

Question 172

A DNS beacon alert occurs every evening at exactly the same minute. Which check best distinguishes scheduled software updates from malicious check-ins?

  1. Ignore all periodic traffic without process inspection
  2. Use only country code of the remote server as proof
  3. Treat evenly spaced connections as conclusive malware activity
  4. Check the process and destination against approved update behavior

Explanation

Correct Answer

D:

Temporal periodicity alone is ambiguous; process provenance and authorized business function make the difference.

Incorrect Answers

A:

A malicious implant can intentionally use periodic communication; blanket dismissal would miss its activity.

B:

Geolocation is imperfect and cannot validate local process execution or whether the connection was authorized.

C:

Approved updaters and monitoring agents also operate on fixed schedules, so cadence is not a unique indicator.

Question 173

A SIEM tags a suspicious server as retired, but current inventory suggests it processes payroll. What should the analyst do?

  1. Accept the older SIEM tag without checking live ownership
  2. Reconcile asset ownership before assigning business impact
  3. Delete the alert because retired systems cannot be compromised
  4. Escalate as an enterprise-wide breach solely because one inventory row differs

Explanation

Correct Answer

B:

Stale CMDB attributes can cause serious under-prioritization; accurate service context matters to containment and notification.

Incorrect Answers

A:

Outdated labels may understate the risk of a production payroll host and distort severity assignment.

C:

Decommissioning states are administrative records and do not guarantee that a host is offline or inaccessible.

D:

Metadata disagreement needs validation; it does not itself prove the scope of any malicious activity.

Question 174

A network IDS flags outbound exfiltration, but endpoint EDR shows the same traffic from an approved backup agent. What should the SOC do?

  1. Validate the recipient and authorized backup schedule
  2. Assume the EDR automatically guarantees every backup transmission is approved
  3. Block all backup traffic globally without reviewing production dependencies
  4. Discard the IDS evidence because the process is signed

Explanation

Correct Answer

A:

Corroboration helps distinguish expected large transfers from abuse of a trusted agent or a misconfigured destination.

Incorrect Answers

B:

Endpoint classification identifies a process but not necessarily the business authorization of each transfer.

C:

Unscoped blocking could destroy availability or recovery objectives while the alert is not yet validated.

D:

Signed software can be misused; the destination and data moved remain relevant to the decision.

Question 175

Three analysts receive notifications for one host because different rules identify the same suspicious process chain. Which queue behavior is most helpful?

  1. Always keep every alert independent even after clear case correlation
  2. Delete two detections before anyone can see their evidence
  3. Link the detections under one case owner without losing evidence
  4. Create three independent containment actions against the same endpoint

Explanation

Correct Answer

C:

A deduplicated incident avoids redundant work while preserving the distinctions between rule observations.

Incorrect Answers

A:

Unlinked work increases handoff mistakes and gives the appearance of multiple incidents where one chain is being observed.

B:

Removing source evidence may conceal important signals or weaken confidence in the incident.

D:

Duplicate actions can conflict or waste time, especially when each analyst acts without a common owner.

Question 176

A case is classified as medium severity, but analysis uncovers active credential theft from a privileged service. What should happen?

  1. Suppress all other alerts for that service until the case is closed
  2. Reassess severity using expanded evidence and affected scope
  3. Keep the original severity because a case label must never change
  4. Close the case because an initial medium designation implies low risk

Explanation

Correct Answer

B:

Incident categorization should change when confidence, asset criticality, and active consequences become clearer.

Incorrect Answers

A:

Blanket suppression may hide propagation or additional stages in the same intrusion.

C:

Static labels can obscure worsening incidents and delay authorized containment or specialist support.

D:

Severity is an evolving judgment and does not invalidate later evidence of serious compromise.

Question 177

The SIEM reports a suspicious sign-in, but the source log is missing from the search results. What is the correct analyst treatment?

  1. Record it as unconfirmed and investigate the missing source data
  2. Delete the case and permanently disable the original detection
  3. Assume a connector failure means the sign-in never happened
  4. Treat the alert title as legally sufficient proof of identity theft

Explanation

Correct Answer

A:

Source evidence is necessary to validate parser output, account details, and the exact event; missing telemetry reduces confidence.

Incorrect Answers

B:

The right response includes investigating the pipeline and preserving what remains of the alert context.

C:

Ingestion outages can hide genuine events, so absence of source logs does not prove absence of activity.

D:

An analytic label without underlying records is not a defensible basis for attribution or incident confirmation.

Question 178

An investigation team wants to quantify the time between when an alert enters the queue and when a responder first accepts it. Which measure applies?

  1. Mean time to detect measured from attack start
  2. False-negative rate based on a validated test set
  3. Mean time to remediate measured until patch deployment
  4. Mean time to acknowledge (MTTA)

Explanation

Correct Answer

D:

This measures queue responsiveness and staffing effectiveness, distinct from detection delay and investigation closure time.

Incorrect Answers

A:

Detection delay ends when suspicious activity is first identified, not when the analyst accepts a generated ticket.

B:

Missed-detection frequency is a coverage measure and contains no queue acceptance time component.

C:

Remediation latency concerns fixing the threat or exposure, a later phase than initial case acknowledgement.

Question 179

A firewall alert matches scheduled penetration testing approved by the security office. How should the analyst close it?

  1. Erase the raw logs because the tester was approved
  2. Disable every rule matching the penetration-testing source for the next year
  3. Close as authorized with approval and observed evidence attached
  4. Mark it confirmed malicious to increase monthly detection totals

Explanation

Correct Answer

C:

A defensible benign disposition documents why the behavior was expected and preserves feedback for detection tuning.

Incorrect Answers

A:

Authorized simulation still produces useful control validation and audit records; deletion would weaken accountability.

B:

Future source use or scope changes may differ, so any exclusion should be narrowly time- and purpose-bound.

D:

Falsely labeling authorized tests corrupts SOC metrics and leads to unnecessary response actions.

Question 180

An analyst can investigate only one of two alerts first: confirmed credential theft on an administrator account or a low-confidence scanner finding on an unused lab server. What is the defensible priority?

  1. The verified compromise of a highly privileged identity
  2. Assign priority solely by the number of rule names attached to each alert
  3. The lab finding because vulnerability scanner reports arrive first in the queue
  4. Investigate neither until both triggers fire again

Explanation

Correct Answer

A:

Active credential theft against an administrative identity can enable rapid expansion and needs urgent containment coordination.

Incorrect Answers

B:

Detection-label count does not establish criticality or the business consequences of the underlying behavior.

C:

Arrival order is not a substitute for severity, evidence confidence, and the impact of affected privileges.

D:

Confirmed compromise is actionable now; waiting for additional repetition can extend attacker access.

Certified SOC Analyst (312-39) Practice Tests