ECCouncil 312-39 (Certified SOC Analyst) Practice Test 14

Question 130

A failed-login rule creates one alert per failure and overwhelms the queue during a password attack. What change can preserve the pattern while reducing volume?

  1. Group by account and source, issuing one windowed summary
  2. Remove timestamps from failed-logon events
  3. Create a separate high-severity case for every rejected password
  4. Erase all authentication failures from the SIEM

Explanation

Correct Answer

A:

Grouping related failures retains their count and temporal significance while preventing redundant analyst tickets.

Incorrect Answers

B:

Timestamps are necessary to recognize rate-based attack patterns and avoid unrelated event aggregation.

C:

One-to-one alerting is the current source of queue overload, and higher priority would amplify the problem.

D:

Removing those records prevents investigation of password attacks and destroys useful supporting data.

Question 131

A new detection fires whenever any user transfers more than 1 GB in a day, frequently flagging approved backup operators. What is a stronger design?

  1. Classify every backup operator as exempt from all SOC detections
  2. Set the threshold to infinity for all identities
  3. Combine peer-group baselines and data classification with transfer behavior
  4. Ignore destination and user role whenever byte count exceeds the threshold

Explanation

Correct Answer

C:

Context can separate routine high-volume jobs from unusual sensitive exports without suppressing the entire data-loss scenario.

Incorrect Answers

A:

An approved role can still be compromised and may perform malicious activity unrelated to backups.

B:

No rule would ever fire, abandoning detection of unusual or malicious data transfers.

D:

Volume alone caused the current nuisance alerts; removing context will not improve discrimination.

Question 132

The SIEM rule expects proxy destination fields, but an updated proxy connector now omits them. What is the proper response?

  1. Change all alerts to informational without fixing the connector
  2. Assume the lack of alerts proves all outbound traffic is safe
  3. Investigate the telemetry gap and fix the field mapping
  4. Delete the documented rule data requirements

Explanation

Correct Answer

C:

Missing required fields can silently break correlation; monitors and tests should flag the analytic coverage gap.

Incorrect Answers

A:

Severity changes do not restore absent destination fields or the analytics that depend on them.

B:

A rule without its required data cannot provide meaningful absence-of-threat assurance.

D:

Removing requirements from documentation does not make the missing telemetry available to the detection engine.

Question 133

A SIEM query scans all indexes for one short incident window and times out. What should be optimized first?

  1. Stop normalizing the fields needed for the query
  2. Make every event a permanent critical alert
  3. Limit queries to relevant times, sources, and indexed fields
  4. Remove all time filters to capture more unrelated events

Explanation

Correct Answer

C:

Targeted searches reduce expensive scanning while preserving relevant events, with query plans and data volume assessed where available.

Incorrect Answers

A:

Dropping indexed fields can make investigation less efficient and reduce cross-source analytical value.

B:

Alert levels do not optimize the underlying search and add substantial noise.

D:

Broadening the query expands work and usually worsens the timeout without improving relevance.

Question 134

A SIEM produces three detections tied to one confirmed phishing compromise. Why should they often be grouped into a single case?

  1. A single case means only one evidence artifact should be retained
  2. Grouping ensures every alert will automatically be a true positive
  3. A case groups related alerts and the corresponding investigation
  4. Combining alerts proves they were all generated by the same malware binary

Explanation

Correct Answer

C:

Grouping maintains one incident timeline and owner while preserving the contributing alerts as distinct supporting signals.

Incorrect Answers

A:

Consolidation improves workflow; it does not justify discarding the identity, mail, and endpoint records behind each alert.

B:

Case management does not replace validation; individual events may still be benign or incidental.

D:

Shared case linkage can reflect one attack chain without establishing identical binary or technique details.

Question 135

A SIEM must detect unauthorized identity role grants in a cloud directory. Which telemetry source is most relevant?

  1. Only raw CPU temperature readings from user laptops
  2. Only web-page response-time histograms
  3. Only firewall interface error counters
  4. Directory role-assignment audit records

Explanation

Correct Answer

D:

Control-plane audit events can show who changed role membership or grants and when, providing the primary evidence for this analytic.

Incorrect Answers

A:

Host sensor health cannot describe cloud-directory privilege assignment operations.

B:

Latency metrics lack the actor, target, and operation details needed to detect unauthorized privilege grants.

C:

Link faults do not directly log who granted an identity role in a cloud tenant.

Question 136

An EDR and a SIEM both emit tickets for the same malicious process. Which design avoids double investigation without discarding useful evidence?

  1. Assume a duplicate alert proves two independent attackers
  2. Disable all EDR detections whenever the SIEM is active
  3. Combine detections into one incident using a shared host and process
  4. Keep separate tickets and forbid cross-references

Explanation

Correct Answer

C:

A shared correlation key preserves detection provenance while assigning one investigative owner and one coordinated response timeline.

Incorrect Answers

A:

Different products may observe the same event; repeated reporting is not evidence of distinct adversaries.

B:

The EDR supplies unique host telemetry and response capabilities that should not be globally removed.

D:

Independent cases recreate duplicate work and make it harder to assemble a unified compromise timeline.

Question 137

A detection engineer requests permanent production access to change all SIEM retention and access settings although their role is only to develop analytic rules. What control should be applied?

  1. Separate rule development privileges from platform administration
  2. Use a shared administrator password with no change log
  3. Grant unrestricted superadministrator access to every detection author
  4. Block the engineer from viewing any test data or validation results

Explanation

Correct Answer

A:

Least-privilege roles limit accidental or malicious changes to security data while allowing controlled rule development.

Incorrect Answers

B:

Shared privileged credentials weaken accountability and bypass the change controls needed for a sensitive telemetry platform.

C:

Broad privileges expose ingestion, storage, and log deletion functions far beyond the task requirement.

D:

Detection development requires appropriate test access; the goal is scoped privileges, not elimination of required capability.

Question 138

An identity correlation rule must raise an alert when a single source repeatedly fails against one user and then successfully signs in. Which condition best represents the use case?

  1. Any successful sign-in from a previously seen device
  2. Repeated failures then success for one account and source
  3. Total daily failures across all accounts with no success condition
  4. One password reset request from an approved help-desk user

Explanation

Correct Answer

B:

The sequence links guessing activity to possible account access and can be enriched with device, IP reputation, and existing sign-in patterns.

Incorrect Answers

A:

A success alone lacks the preceding attack behavior and would generate large volumes of routine authentication noise.

C:

A global failure count loses source and account attribution and does not test whether an attempted attack culminated in access.

D:

A managed reset may be unrelated to authentication guessing and does not satisfy the required failure-to-success chain.

Question 139

A SIEM engineer is building a password-spray analytic. Which grouping distinguishes spraying from high-volume guesses against one account?

  1. Aggregate every failed authentication across the tenant with no source attribution
  2. Count unique targeted users for each source over time
  3. Count only successful MFA challenges from a single administrator
  4. Alert only when one username has hundreds of failures in a minute

Explanation

Correct Answer

B:

Broad username coverage with shallow guessing per user is characteristic of spraying and avoids per-account lockout thresholds.

Incorrect Answers

A:

A tenant-wide total may reflect normal errors or multiple campaigns and fails to detect a common origin targeting many users.

C:

Completed second-factor approvals do not describe the broad failed password tests of a spray campaign.

D:

That captures concentrated brute force, not the distributed-account pattern specified for password spraying.

Question 140

A user appears to sign in from two distant countries five minutes apart. What is the most important triage qualification?

  1. Verify VPN or proxy use, device context, and geolocation accuracy
  2. Treat the result as confirmed exfiltration of sensitive files
  3. Suppress all location-based analytics for the user forever
  4. Disable the user permanently before confirming either session

Explanation

Correct Answer

A:

Travel-time anomalies are useful signals but can be misleading when one person uses corporate VPN gateways or inaccurate location databases.

Incorrect Answers

B:

Sign-in geography does not establish document access or outbound data transfer from the account.

C:

An authorized VPN exception should be scoped and maintained, not used to ignore all future travel anomalies.

D:

Irreversible access actions are not justified by geolocation alone without examining session and business context.

Certified SOC Analyst (312-39) Practice Tests