Question 140
A user appears to sign in from two distant countries five minutes apart. What is the most important triage qualification?
- Verify VPN or proxy use, device context, and geolocation accuracy
- Treat the result as confirmed exfiltration of sensitive files
- Suppress all location-based analytics for the user forever
- 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?
- Classify the approved request as automatically legitimate
- Investigate MFA fatigue and verify the sign-in with the user
- Focus only on patch compliance for the user's laptop
- 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?
- The daily count of installed browser extensions only
- The number of active DHCP leases on a nearby router
- The reputation of every hostname in the entire organization with no process correlation
- 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?
- Alert only if the user performs a successful browser login later
- Count only the total disk space used by the host
- Suppress both events because administrators sometimes perform maintenance
- 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?
- Scheduled-task creation with creator and executable path
- A successful user logoff event after business hours
- A network DNS lookup for a public update site only
- 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?
- Assume every process spawned by a server is automatically malicious
- Correlate requests with server-side command execution
- Treat HTTP 200 responses alone as exploit success
- 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?
- Treat every apostrophe in a URL as confirmed database compromise
- Ignore database audits whenever the WAF has a detection rule
- Alert only on server CPU utilization exceeding a fixed threshold
- 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?
- A request returning HTTP 200 for the post, with no browser-side execution trace
- Find injected content plus evidence of browser-side execution
- WAF alert totals without the submitted payload or page-rendering evidence
- 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?
- Alert on every request containing a numerical identifier
- Discard successful responses because only HTTP errors are suspicious
- Use only the average response latency of the API
- 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?
- Trigger on HTTP request totals without checking endpoint cost or backend saturation
- Alert on only per-IP rate thresholds rather than aggregated activity across sources
- Correlate request floods with service saturation metrics
- 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?
- Look for unusual long, high-entropy queries to rare domains
- Alert whenever a user visits any website with a subdomain
- Rely solely on the top-level domain being uncommon
- 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.