ECCouncil 312-39 (Certified SOC Analyst) Practice Test 15

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.

Question 141

A SIEM sees a burst of denied MFA push notifications and one later approval from the same identity. Which investigation is most appropriate?

  1. Classify the approved request as automatically legitimate
  2. Investigate MFA fatigue and verify the sign-in with the user
  3. Focus only on patch compliance for the user's laptop
  4. Erase all rejected challenges because they do not create sessions

Explanation

Correct Answer

B:

Unexpected repeated prompts followed by success may represent social engineering, especially when the user did not initiate authentication.

Incorrect Answers

A:

A user can approve an attacker-triggered prompt under pressure, so approval does not prove authorization.

C:

Patch state is helpful background but does not explain the authentication push sequence or determine whether the sign-in was intended.

D:

The failures provide essential pattern evidence for a possible fatigue attack and should remain correlated with the later approval.

Question 142

A rule detects PowerShell launched with encoded command arguments by a document viewer. Which supporting field makes the finding substantially stronger?

  1. The daily count of installed browser extensions only
  2. The number of active DHCP leases on a nearby router
  3. The reputation of every hostname in the entire organization with no process correlation
  4. Process ancestry plus decoded script execution details

Explanation

Correct Answer

D:

An unusual office-app parent and opaque command execution support a targeted investigation beyond a generic detection of encoded arguments.

Incorrect Answers

A:

Browser inventory does not tie the document viewer to the observed PowerShell command or explain its execution.

B:

Lease volume is unrelated to the suspicious process chain on the endpoint.

C:

Global reputation summaries cannot validate the specific parent-child execution relationship behind the alert.

Question 143

A Windows endpoint reports a cleared Security log and immediate suspension of its EDR service. Which analytic is most useful?

  1. Alert only if the user performs a successful browser login later
  2. Count only the total disk space used by the host
  3. Suppress both events because administrators sometimes perform maintenance
  4. Join log-clear activity to agent tampering on the same host

Explanation

Correct Answer

D:

Multiple tampering signals on one endpoint increase confidence of attempted defense evasion and warrant urgent host investigation.

Incorrect Answers

A:

The suspicious host-level controls were already changed; an unrelated later browser event should not be a prerequisite.

B:

Storage capacity alone cannot detect the sequence of audit clearing and agent interruption.

C:

Legitimate maintenance requires change correlation, not unconditional exclusion of log and agent tampering.

Question 144

A scheduled task is created at 02:00 to launch a binary from a user-writable temporary directory. What should a SIEM analytic emphasize?

  1. Scheduled-task creation with creator and executable path
  2. A successful user logoff event after business hours
  3. A network DNS lookup for a public update site only
  4. Any scheduled task created by an approved systems team, without path context

Explanation

Correct Answer

A:

Combining administrative event details with a suspicious path and timing helps distinguish malicious persistence from expected scheduler operations.

Incorrect Answers

B:

Logoff timing does not establish an unusual scheduled execution entry pointing to writable content.

C:

Name resolution does not identify the creation of a logon or time-triggered persistence mechanism.

D:

Enterprise automation frequently uses scheduled tasks; alerting on all of them ignores the risky executable location and context.

Question 145

A web server process unexpectedly spawns a command interpreter after an HTTP request containing unusual parameters. Which linkage most strengthens a remote-code-execution hypothesis?

  1. Assume every process spawned by a server is automatically malicious
  2. Correlate requests with server-side command execution
  3. Treat HTTP 200 responses alone as exploit success
  4. Use only the external client's country without host telemetry

Explanation

Correct Answer

B:

Connecting a request to a shell child process is stronger than separately observing suspicious URL text or generic host execution.

Incorrect Answers

A:

Some applications invoke legitimate subprocesses; baseline, parentage, and request context decide suspiciousness.

C:

A successful HTTP status may serve benign content and does not show command execution on the server.

D:

Geolocation can enrich the case but cannot establish that the server executed an injected command.

Question 146

A WAF log flags SQL-like input while the database audit shows abnormal privilege-bypassing queries from the same application session. Which SIEM logic is strongest?

  1. Treat every apostrophe in a URL as confirmed database compromise
  2. Ignore database audits whenever the WAF has a detection rule
  3. Alert only on server CPU utilization exceeding a fixed threshold
  4. Join WAF request data to executed SQL and account activity

Explanation

Correct Answer

D:

Two independent layers linking the same request and unusual data access provide better evidence than a raw signature match alone.

Incorrect Answers

A:

Ordinary input can contain punctuation; a character pattern alone does not establish execution or unauthorized access.

B:

WAF observations do not prove what the database executed; backend logs provide essential impact context.

C:

Resource usage is nonspecific and may miss successful low-volume injection against sensitive records.

Question 147

A SOC monitors a customer portal for stored XSS. Which combination of events is most useful for validating reported exploitation?

  1. A request returning HTTP 200 for the post, with no browser-side execution trace
  2. Find injected content plus evidence of browser-side execution
  3. WAF alert totals without the submitted payload or page-rendering evidence
  4. A query-string reflection alert without evidence that the post payload persisted

Explanation

Correct Answer

B:

Correlating where hostile content entered with when other users received it supports investigation of a persistent browser-script injection.

Incorrect Answers

A:

A successful response shows delivery of a page or request but does not establish that malicious content executed in an affected browser session.

C:

A block count can identify suspicious traffic but cannot confirm storage, later delivery, and execution of the malicious script in a user session.

D:

Reflected input is a different exposure pattern; the scenario asks whether stored content was served and ran when later visitors viewed the post.

Question 148

A basic user repeatedly accesses objects belonging to other accounts through a predictable API path. Which analytic is appropriate?

  1. Alert on every request containing a numerical identifier
  2. Discard successful responses because only HTTP errors are suspicious
  3. Use only the average response latency of the API
  4. Link user identity to object ownership and enumeration patterns

Explanation

Correct Answer

D:

Authorization violations are clearest when returned objects do not belong to the principal, not simply because object identifiers are sequential.

Incorrect Answers

A:

Numeric object IDs are common in valid applications, so that signature lacks authorization context.

B:

Broken object-level authorization can return HTTP 200 while leaking records, making successes vital evidence.

C:

Latency does not establish which user retrieved whose records or whether authorization was enforced.

Question 149

A reverse proxy sees sustained HTTP requests against one expensive endpoint from many sources and service latency climbs. What detection is most suitable?

  1. Trigger on HTTP request totals without checking endpoint cost or backend saturation
  2. Alert on only per-IP rate thresholds rather than aggregated activity across sources
  3. Correlate request floods with service saturation metrics
  4. Detect only incomplete TCP handshakes and ignore application request outcomes

Explanation

Correct Answer

C:

An application-layer flood becomes clearer when high request volume aligns with resource exhaustion and abnormal origin behavior.

Incorrect Answers

A:

High throughput is not necessarily denial of service. The correlation should capture distributed requests against an expensive route and its measured impact.

B:

A distributed application flood can use modest per-client request rates while overwhelming one expensive endpoint in aggregate.

D:

SYN-flood telemetry captures network exhaustion, not the completed HTTP requests and backend work that define this application-layer incident.

Question 150

A detection rule should identify possible DNS tunneling while avoiding legitimate long cloud service names. What evidence combination is strongest?

  1. Look for unusual long, high-entropy queries to rare domains
  2. Alert whenever a user visits any website with a subdomain
  3. Rely solely on the top-level domain being uncommon
  4. Block every TXT query made by corporate devices

Explanation

Correct Answer

A:

Multiple statistical and contextual signals are more discriminating than a single long domain label.

Incorrect Answers

B:

Subdomains are routine Internet naming constructs and are too broad to isolate suspicious tunneling.

C:

A rare suffix is weak without query cadence, content characteristics, and knowledge of the querying application.

D:

TXT records are used by legitimate email and domain services; unconditional blocking risks disruption.

Certified SOC Analyst (312-39) Practice Tests