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CompTIA CS0-003 Practice Test 79

Question 780

A departing employee uploads confidential files to personal storage outside usual role patterns. What is the MOST appropriate analyst action based on the evidence?

  1. Revoke applicable sessions and delegated access and check for subsequent cloud use.
  2. Confirm business authorization and project context before classifying malicious intent.
  3. Collect only relevant custodians, time ranges and evidence under approved authority.
  4. Preserve endpoint and cloud audit evidence and involve authorized insider-risk and HR contacts.

Explanation

Correct Answer

D:

Insider investigation requires provenance and privacy-aware governance. Investigate suspected departing employee exfiltration.

Incorrect Answers

A:

Physical device control alone cannot stop already-issued cloud credentials. That is relevant to insider data theft investigation, not to investigate suspected departing employee exfiltration.

B:

Legitimate data access can resemble exfiltration without policy context. It would distinguish authorized bulk data movement, but it would not investigate suspected departing employee exfiltration.

C:

Broad unrelated collection undermines proportionate incident handling. It could help limit insider investigation evidence scope, but it would not investigate suspected departing employee exfiltration.

Question 781

A compromised host exploits SMB across a flat office network and new infections appear hourly. Which next step is MOST defensible for the security team?

  1. Segment infected subnets and restrict lateral SMB paths immediately.
  2. Apply risk-based temporary controls and coordinate critical service dependencies.
  3. Verify current sensor data or inspect the host in authorized isolation.
  4. Patch or disable the exploited service across all impacted systems before reconnecting.

Explanation

Correct Answer

A:

Network containment limits autonomous worm spread. Contain self-propagating SMB malware.

Incorrect Answers

B:

Containment should limit spread without avoidable enterprise-wide outage. It could help avoid indiscriminate file-share shutdown, but it would not contain self-propagating SMB malware.

C:

Stale last-seen evidence cannot prove malware absence. That is relevant to worm propagation over file shares, not to contain self-propagating SMB malware.

D:

Eradication requires closing the exploit route that enabled propagation. It would close SMB worm propagation vulnerability, but it would not contain self-propagating SMB malware.

Question 782

An incident includes multiple forensic exhibits with identical names in different cases. Which action BEST aligns with sound security operations?

  1. Retain the original and generate a fresh verified analysis copy.
  2. Assign unique exhibit identifiers and maintain per-case custody records.
  3. Implement a scoped approved legal hold on relevant log and mailbox sources.
  4. Record acquisition metadata and corroborate with machine logs where possible.

Explanation

Correct Answer

B:

Ambiguous artifact identity can break evidence traceability. Resolve duplicate forensic exhibit naming.

Incorrect Answers

A:

Evidence working copies should not replace untouched originals. It could help recover from altered working forensic image, but it would not resolve duplicate forensic exhibit naming.

C:

Preservation obligations take precedence over routine deletion schedules. It would preserve incident evidence under legal hold, but it would not resolve duplicate forensic exhibit naming.

D:

Context is necessary to authenticate ephemeral screen evidence. It could help document console screenshot provenance, but it would not resolve duplicate forensic exhibit naming.

Question 783

A security lead restores a service before required integrity checks to meet a deadline. Which response BEST addresses the security problem described?

  1. Patch and harden the restored workload before reconnecting to production.
  2. Obtain business validation against agreed transactions and recovery criteria.
  3. Maintain controlled hold until critical integrity and access checks pass.
  4. Make security logging part of recovery acceptance conditions.

Explanation

Correct Answer

C:

Fast availability without integrity can extend incident harm. Prevent unsafe accelerated service restoration.

Incorrect Answers

A:

Recovery must not reinstate the exploit that caused the incident. That is relevant to coordination with business recovery, not to prevent unsafe accelerated service restoration.

B:

A service can appear healthy while failing its intended business function. It would require business owner recovery acceptance, but it would not prevent unsafe accelerated service restoration.

D:

Restored operations need ongoing detection capability. That is relevant to coordination with business recovery, not to prevent unsafe accelerated service restoration.

Question 784

An incident summary says phishing was the root cause although the stolen password could bypass all MFA policies. Which investigative or response action BEST fits the evidence?

  1. Include privileged backup access and segmentation failures in root cause review.
  2. Compare change sequence and actual failure mechanisms before attributing causation.
  3. Continue initial-access investigation or document the unknown entry vector explicitly.
  4. Investigate the authentication control gap and policy exceptions separately from the initial lure.

Explanation

Correct Answer

D:

Trigger events and systemic enabling weaknesses are not always the same cause. Identify underlying control gap in phishing incident.

Incorrect Answers

A:

Systemic controls influence severity beyond initial access. It would analyze ransomware backup control contribution, but it would not identify underlying control gap in phishing incident.

B:

Chronological proximity alone does not prove technical cause. It could help validate causal root of patch-induced outage, but it would not identify underlying control gap in phishing incident.

C:

Naming malware is not equivalent to establishing root cause. That is relevant to root cause versus contributing factors, not to identify underlying control gap in phishing incident.

Question 785

A SOC analyst discovers overnight compromise but has no reachable after-hours legal contact. What is the MOST appropriate analyst action based on the evidence?

  1. Maintain tested on-call routing and backup contacts in the response plan.
  2. Separate technical evidence duties from approved communications authority.
  3. Assign accountable incident command and business-impact approval roles.
  4. Establish severity thresholds and notification paths tied to business impact.

Explanation

Correct Answer

A:

Time-critical response depends on contact availability beyond business hours. Create resilient after-hours IR call tree.

Incorrect Answers

B:

Specialized roles improve accuracy and reduce unauthorized disclosure. That is relevant to ir plan roles and escalation, not to create resilient after-hours IR call tree.

C:

Disruptive containment requires clear decision authority before an emergency. It would define incident containment authorization, but it would not create resilient after-hours IR call tree.

D:

Consistent declaration criteria prevent delayed or excessive escalation. It could help standardize major incident declaration threshold, but it would not create resilient after-hours IR call tree.

Question 786

A playbook is updated but old copies remain bookmarked by responders. Which next step is MOST defensible for the security team?

  1. Plan log storage, retention and privacy impacts before implementation.
  2. Version, publish and retire obsolete playbook references with confirmation.
  3. Assign an inventory owner and measurable asset mapping correction task.
  4. Conduct a targeted exercise or control test showing the weakness is addressed.

Explanation

Correct Answer

B:

Responders must use a current authoritative procedure under stress. Prevent outdated IR playbook usage.

Incorrect Answers

A:

Better observability requires sustainable and lawful data handling. That is relevant to improvement ownership and documentation, not to prevent outdated IR playbook usage.

C:

Unowned lessons do not reduce future triage delays. It could help assign postincident CMDB improvement owner, but it would not prevent outdated IR playbook usage.

D:

Training completion metrics alone do not prove performance change. That is relevant to improvement ownership and documentation, not to prevent outdated IR playbook usage.

Question 787

Repeated incidents stem from the same unpatched appliance but owners close each ticket separately. Which action BEST aligns with sound security operations?

  1. Validate improvements through follow-up exercises and targeted technical tests.
  2. Assign a telemetry owner, deadline and verification criterion to the improvement.
  3. Address remediation governance and recurring technical debt across the program.
  4. Add a central timestamped response decision log to the playbook.

Explanation

Correct Answer

C:

Pattern analysis reveals systemic causes across individual incident records. Eliminate recurring incident root vulnerability.

Incorrect Answers

A:

Written changes do not prove operational effectiveness. It would verify postincident improvement in exercise, but it would not eliminate recurring incident root vulnerability.

B:

Lessons only reduce future risk when converted into accountable work. It could help operationalize detection coverage lesson, but it would not eliminate recurring incident root vulnerability.

D:

Incident decisions require traceable authorization and handoffs. It would fix missing incident decision journal, but it would not eliminate recurring incident root vulnerability.

Question 788

A team closes a lesson because training slides were distributed without checking real behavior. Which response BEST addresses the security problem described?

  1. Assign an inventory owner and measurable asset mapping correction task.
  2. Version, publish and retire obsolete playbook references with confirmation.
  3. Plan log storage, retention and privacy impacts before implementation.
  4. Conduct a targeted exercise or control test showing the weakness is addressed.

Explanation

Correct Answer

D:

Training completion metrics alone do not prove performance change. Verify lessons learned behavioral effectiveness.

Incorrect Answers

A:

Unowned lessons do not reduce future triage delays. It could help assign postincident CMDB improvement owner, but it would not verify lessons learned behavioral effectiveness.

B:

Responders must use a current authoritative procedure under stress. That is relevant to improvement ownership and documentation, not to verify lessons learned behavioral effectiveness.

C:

Better observability requires sustainable and lawful data handling. It would govern new logging after postincident review, but it would not verify lessons learned behavioral effectiveness.

Question 789

An organization has playbooks but no criteria for declaring a major security incident. Which investigative or response action BEST fits the evidence?

  1. Establish severity thresholds and notification paths tied to business impact.
  2. Assign accountable incident command and business-impact approval roles.
  3. Separate technical evidence duties from approved communications authority.
  4. Maintain tested on-call routing and backup contacts in the response plan.

Explanation

Correct Answer

A:

Consistent declaration criteria prevent delayed or excessive escalation. Standardize major incident declaration threshold.

Incorrect Answers

B:

Disruptive containment requires clear decision authority before an emergency. It would define incident containment authorization, but it would not standardize major incident declaration threshold.

C:

Specialized roles improve accuracy and reduce unauthorized disclosure. It could help segregate response evidence and public communication roles, but it would not standardize major incident declaration threshold.

D:

Time-critical response depends on contact availability beyond business hours. That is relevant to ir plan roles and escalation, not to standardize major incident declaration threshold.

Question 790

An organization tests disaster recovery only for single-server failures, not identity outage. What is the MOST appropriate analyst action based on the evidence?

  1. Use dependency-based recovery order informed by business impact analysis.
  2. Add systemic outage scenarios that affect shared authentication and network dependencies.
  3. Rank recovery using business impact, safety and maximum tolerable downtime.
  4. Rotate secret material as part of validated clean restoration.

Explanation

Correct Answer

B:

Single-host tests may miss common-mode failures. Exercise systemic recovery failure modes.

Incorrect Answers

A:

Recovered frontends cannot function without critical upstream services. It would sequence recovery according to dependencies, but it would not exercise systemic recovery failure modes.

C:

Risk-based prioritization protects essential services first. That is relevant to recovery dependency and prioritization, not to exercise systemic recovery failure modes.

D:

Backup restoration may reproduce credential compromise. It would eliminate secrets retained in recovery snapshot, but it would not exercise systemic recovery failure modes.


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