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CompTIA CS0-003 Practice Test 30

Question 290

A hunt report claims tactic coverage merely because one hash was searched. What is the MOST appropriate analyst action based on the evidence?

  1. Validate execution, encryption attempts and related process chains before incident classification.
  2. Map actual data sources and detection logic to relevant behavior techniques.
  3. Correlate beacon cadence and process behavior with the threat technique across destinations.
  4. Hunt for the credential access behavior rather than only known file digests.

Explanation

Correct Answer

B:

Searching one indicator does not establish detection coverage for a broader tactic. Evaluate behavioral coverage versus IOC search.

Incorrect Answers

A:

An IOC hit is evidence to investigate, not necessarily completed attack activity. It could help avoid equating isolated IOC with ransomware incident, but it would not evaluate behavioral coverage versus IOC search.

C:

Infrastructure indicators alone are brittle against rapid endpoint rotation. It would maintain C2 detection across infrastructure changes, but it would not evaluate behavioral coverage versus IOC search.

D:

Behavioral techniques survive simple payload recompilation. It could help pivot from changing hashes to stable TTP, but it would not evaluate behavioral coverage versus IOC search.

Question 291

A hunt hypothesis targets unauthorized changes to OT controller logic. Which next step is MOST defensible for the security team?

  1. Choose a locally approved offline workflow and protect isolation boundaries.
  2. Coordinate non-disruptive collection with service owners before any invasive action.
  3. Use approved passive change telemetry and historian records with OT engineering support.
  4. Use minimal pseudonymized telemetry and approved access paths rather than unnecessary raw PII.

Explanation

Correct Answer

C:

Intrusive probing of controllers could affect safety and availability. Choose OT-safe hunting evidence.

Incorrect Answers

A:

Disconnected high-sensitivity systems cannot assume external telemetry egress is allowed. That is relevant to threat-hunt scoping against isolated systems, not to choose OT-safe hunting evidence.

B:

Business impact constraints inform hunt procedure even when suspicion is legitimate. It would balance hunt evidence collection with production availability, but it would not choose OT-safe hunting evidence.

D:

Threat hunting must respect data minimization and privacy duties. That is relevant to threat-hunt scoping against isolated systems, not to choose OT-safe hunting evidence.

Question 292

A vendor release notes attack exploitation but provides only a broad product family name. Which action BEST aligns with sound security operations?

  1. Convert confirmed local artifacts into scoped internal detections with confidence metadata.
  2. Cluster shared infrastructure and lure characteristics without assuming a single actor.
  3. Down-rank irrelevant platform-specific signatures after validating actual asset inventory.
  4. Map internal product versions and exposure before choosing hunting predicates.

Explanation

Correct Answer

D:

Version and deployment matching prevents unfocused enterprise alerts. Contextualize vendor advisory to deployed versions.

Incorrect Answers

A:

Organization-specific evidence can be more relevant than generic global feeds. It would operationalize internally confirmed indicator, but it would not contextualize vendor advisory to deployed versions.

B:

Similar techniques and templates may be reused by independent adversaries. It could help correlate local phishing campaign artifacts, but it would not contextualize vendor advisory to deployed versions.

C:

Asset context helps allocate hunting effort where exploitation is feasible. That is relevant to internal versus external intelligence, not to contextualize vendor advisory to deployed versions.

Question 293

An IOC used to block phishing expires but the feed never indicates the last malicious sighting. Which response BEST addresses the security problem described?

  1. Record expiration and require recent corroboration before retaining the blocking rule.
  2. Summarize relevant threat impact, confidence and protective decisions for business owners.
  3. Provide technical observables to responders and business-impact analysis to leadership.
  4. Tag evidence type, confidence and observed exploitation status separately.

Explanation

Correct Answer

A:

Persistent blocks on stale indicators can impair legitimate access. Govern indicator lifecycle with last-seen data.

Incorrect Answers

B:

Intelligence must be contextualized for recipients who control business risk. That is relevant to indicator lifecycle and intelligence consumer needs, not to govern indicator lifecycle with last-seen data.

C:

Different intelligence consumers require distinct actionable levels of detail. It would differentiate operational versus strategic intelligence, but it would not govern indicator lifecycle with last-seen data.

D:

Confusing potential with observed attacks distorts response priorities. It could help classify intelligence evidence strength, but it would not govern indicator lifecycle with last-seen data.

Question 294

A trusted CERT updates its actor attribution after discovering false infrastructure links. Which investigative or response action BEST fits the evidence?

  1. Mark attribution as unconfirmed and seek independent campaign-specific behavioral corroboration.
  2. Amend internal intelligence records and notify consumers of the confidence change.
  3. Compare TTP sequence and targeting with multiple high-quality sources before grouping campaigns.
  4. Distinguish hosting location from operator identity and require independent attribution evidence.

Explanation

Correct Answer

B:

Attribution corrections must propagate to downstream decisions. Correct stale internal actor classification.

Incorrect Answers

A:

Commodity tools alone are insufficient to identify a unique threat actor. That is relevant to confidence-adjusted actor attribution, not to correct stale internal actor classification.

C:

Single technique overlap can be coincidental across unrelated intrusions. It could help assess campaign clustering uncertainty, but it would not correct stale internal actor classification.

D:

Cloud hosting and proxy routing make geolocation weak evidence of attacker nationality. That is relevant to confidence-adjusted actor attribution, not to correct stale internal actor classification.

Question 295

Repeated decoy login attempts use the same password list as a public breach collection. What is the MOST appropriate analyst action based on the evidence?

  1. Investigate account and access logs with high priority and verify token placement.
  2. Isolate the decoy and review containment architecture immediately.
  3. Analyze the campaign's spray pattern and share sanitized trend indicators.
  4. Separate decoy observations from actual production telemetry before declaring asset impact.

Explanation

Correct Answer

C:

Reused lists reveal attack methods but do not prove user credentials were compromised. Classify credential-stuffing observations from decoy.

Incorrect Answers

A:

Use of a decoy-only credential provides high-signal unauthorized access evidence. It would respond to honeytoken account activation, but it would not classify credential-stuffing observations from decoy.

B:

Honeypots must not become a pivot point into real business assets. It could help contain risky honeypot outbound access, but it would not classify credential-stuffing observations from decoy.

D:

Decoy interaction demonstrates attacker activity, not breach of other hosts. It would avoid mistaking honeypot hit for production compromise, but it would not classify credential-stuffing observations from decoy.

Question 296

An intelligence hunt proposes querying raw patient records to look for an attacker alias. Which next step is MOST defensible for the security team?

  1. Choose a locally approved offline workflow and protect isolation boundaries.
  2. Coordinate non-disruptive collection with service owners before any invasive action.
  3. Use approved passive change telemetry and historian records with OT engineering support.
  4. Use minimal pseudonymized telemetry and approved access paths rather than unnecessary raw PII.

Explanation

Correct Answer

D:

Threat hunting must respect data minimization and privacy duties. Limit sensitive patient data during hunting.

Incorrect Answers

A:

Disconnected high-sensitivity systems cannot assume external telemetry egress is allowed. It could help preserve isolated-network boundaries in hunt, but it would not limit sensitive patient data during hunting.

B:

Business impact constraints inform hunt procedure even when suspicion is legitimate. That is relevant to threat-hunt scoping against isolated systems, not to limit sensitive patient data during hunting.

C:

Intrusive probing of controllers could affect safety and availability. It would choose OT-safe hunting evidence, but it would not limit sensitive patient data during hunting.

Question 297

An automation assigns incidents by hostname alone, misrouting cloud workloads that rotate names. Which action BEST aligns with sound security operations?

  1. Use tenant and stable workload identifiers for routing assignments.
  2. Record per-target acknowledgments and reconcile failed deployments.
  3. Assign one incident commander and orchestrate actions through a shared record.
  4. Exempt active escalations from auto-closure pending accountable resolution.

Explanation

Correct Answer

A:

Dynamic cloud names are insufficient for durable case ownership. Route cloud cases by stable workload identity.

Incorrect Answers

B:

Partial orchestration success must not be reported as universal protection. It would verify distributed security control deployment, but it would not route cloud cases by stable workload identity.

C:

Coordinated response prevents conflicting remediation and lost evidence. It could help prevent competing duplicate containment actions, but it would not route cloud cases by stable workload identity.

D:

Workflow state gates protect investigations from premature termination. That is relevant to playbook incident ownership, not to route cloud cases by stable workload identity.

Question 298

A new playbook was deployed directly to production without testing alert edge cases. Which response BEST addresses the security problem described?

  1. Restore the enforced approval step and audit attempted use.
  2. Validate in a sandbox with benign and malicious samples before enabling automation.
  3. Check approved data processing and location requirements before enabling export.
  4. Record initiating analyst, delegated authority and action outcomes in immutable audit logs.

Explanation

Correct Answer

B:

Untested response logic risks disrupting legitimate operations. Test response automation before production.

Incorrect Answers

A:

Privileged bulk changes should honor separation of duties. It would preserve two-person approval for bulk isolation, but it would not test response automation before production.

C:

Orchestration integrations can move regulated evidence beyond trusted boundaries. That is relevant to automation authorization and audit, not to test response automation before production.

D:

Accountability is required for high-impact identity actions. It would attribute human-triggered automated account suspension, but it would not test response automation before production.

Question 299

A threat-intelligence API returns a score without any timestamp. Which investigative or response action BEST fits the evidence?

  1. Use stable asset identifiers and recency-aware mapping for enrichment.
  2. Deduplicate on verified asset and finding identifiers before reporting volumes.
  3. Require observation freshness metadata or mark confidence limited.
  4. Normalize telemetry units and verify derived dashboard calculations.

Explanation

Correct Answer

C:

Reputation decisions depend on when the underlying evidence was true. Handle undated threat reputation response.

Incorrect Answers

A:

Reassigned hostnames can misattribute historical incident evidence. It could help fix unstable host identity enrichment, but it would not handle undated threat reputation response.

B:

Duplicate records inflate exposure totals and distort prioritization. That is relevant to triage integration failure modes, not to handle undated threat reputation response.

D:

Unit mismatches invalidate operational performance conclusions. It could help correct inconsistent SOC time metrics, but it would not handle undated threat reputation response.

Question 300

A playbook automatically blocks customer production IPs after one low-confidence feed hit. What is the MOST appropriate analyst action based on the evidence?

  1. Monitor enrichment execution health and mark missing values explicitly in the case.
  2. Enrich each case automatically from authoritative inventory and identity APIs.
  3. Require data freshness and health checks before automatic close logic.
  4. Add severity, confidence and business approval gates before disruptive blocking.

Explanation

Correct Answer

D:

High-impact actions require stronger evidence and accountable authorization. Prevent risky auto-block from weak indicator.

Incorrect Answers

A:

Missing context should not be interpreted as a clean reputation verdict. That is relevant to soar enrichment design, not to prevent risky auto-block from weak indicator.

B:

Repeatable read-only context gathering is appropriate for controlled automation. It would automate repetitive security context gathering, but it would not prevent risky auto-block from weak indicator.

C:

Incomplete telemetry must not become false evidence of safety. It could help prevent unsafe automated incident closure, but it would not prevent risky auto-block from weak indicator.


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