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CompTIA CS0-003 Practice Test 70

Question 690

Vendor signatures validate correctly but package hashes differ from expected approved release artifacts. What is the MOST appropriate analyst action based on the evidence?

  1. Revoke deployment approvals and block the identified package/version.
  2. Preserve signed binaries and reconcile build provenance with the vendor's trusted statement.
  3. Pause update distribution and scope installed versions using signed package and EDR evidence.
  4. Rotate updater credentials and verify release infrastructure integrity.

Explanation

Correct Answer

B:

Signature validity does not guarantee a build pipeline was uncompromised. Investigate suspicious signed supplier artifact.

Incorrect Answers

A:

Preventing pending installations limits future spread. That is relevant to supply-chain malware incident, not to investigate suspicious signed supplier artifact.

C:

Trusted distribution paths can propagate compromised build artifacts. It could help contain malicious supplier update rollout, but it would not investigate suspicious signed supplier artifact.

D:

Supply-chain incidents can recur if the distribution authority stays compromised. That is relevant to supply-chain malware incident, not to investigate suspicious signed supplier artifact.

Question 691

An attacker modifies `/etc/sudoers` to add an unauthorized passwordless grant. Which next step is MOST defensible for the security team?

  1. Validate successful privilege change evidence before classifying a root compromise.
  2. Restrict the affected host and inspect root-level changes before remediation.
  3. Preserve the modification and remove the grant under verified administrative access.
  4. Rotate authorized keys and check trust relationships across reachable systems.

Explanation

Correct Answer

C:

Authorization configuration tampering can create persistent elevated privilege. Remove malicious sudoers permission.

Incorrect Answers

A:

Denied elevation attempts are not proof of elevated execution. It would distinguish failed sudo attempt from root takeover, but it would not remove malicious sudoers permission.

B:

Root access invalidates trust in local binaries and audit data. It could help contain confirmed root escalation, but it would not remove malicious sudoers permission.

D:

Shared privileged credentials can maintain external lateral access. It would eradicate residual root SSH trust, but it would not remove malicious sudoers permission.

Question 692

File encryption is active on several shared drives and affected endpoints are still connected. Which action BEST aligns with sound security operations?

  1. Validate immutable clean recovery points and their integrity before restore.
  2. Rotate compromised credentials and validate clean access paths before declaring eradication.
  3. Preserve required forensic artifacts and volatile evidence before destructive rebuilds.
  4. Isolate compromised hosts and shared paths according to the containment playbook.

Explanation

Correct Answer

D:

Immediate propagation control limits additional encryption damage. Contain active ransomware spread.

Incorrect Answers

A:

Restoration from compromised backups can reintroduce malicious or damaged data. It could help choose clean ransomware recovery point, but it would not contain active ransomware spread.

B:

Removing files alone does not remove stolen identity access. That is relevant to ransomware outbreak response, not to contain active ransomware spread.

C:

Reimaging before collection can erase indicators needed for scope and root cause. It would preserve ransomware forensic evidence, but it would not contain active ransomware spread.

Question 693

Ransomware evidence includes an executable and ransom note but responders want to wipe disks immediately. Which response BEST addresses the security problem described?

  1. Preserve required forensic artifacts and volatile evidence before destructive rebuilds.
  2. Rotate compromised credentials and validate clean access paths before declaring eradication.
  3. Validate immutable clean recovery points and their integrity before restore.
  4. Isolate compromised hosts and shared paths according to the containment playbook.

Explanation

Correct Answer

A:

Reimaging before collection can erase indicators needed for scope and root cause. Preserve ransomware forensic evidence.

Incorrect Answers

B:

Removing files alone does not remove stolen identity access. It would verify ransomware eradication includes credentials, but it would not preserve ransomware forensic evidence.

C:

Restoration from compromised backups can reintroduce malicious or damaged data. It could help choose clean ransomware recovery point, but it would not preserve ransomware forensic evidence.

D:

Immediate propagation control limits additional encryption damage. That is relevant to ransomware outbreak response, not to preserve ransomware forensic evidence.

Question 694

A memory sample includes decrypted credentials copied from active sessions. Which investigative or response action BEST fits the evidence?

  1. Acquire authorized volatile evidence and process memory before reboot.
  2. Limit access to the evidence and initiate necessary credential protection.
  3. Analyze process structures and correlate with retained EDR event telemetry.
  4. Investigate stolen tokens and external persistence instead of trusting clean disk results.

Explanation

Correct Answer

B:

Volatile forensics can contain reusable sensitive secrets. Protect credentials found in memory evidence.

Incorrect Answers

A:

Memory-resident payload evidence can disappear during restart. It would preserve volatile fileless malware evidence, but it would not protect credentials found in memory evidence.

C:

Memory structures require external timeline corroboration for reliable parent-child relationships. That is relevant to memory-only malicious activity, not to protect credentials found in memory evidence.

D:

Reboot clears memory code but does not remove identity-based footholds. It would investigate recurrent compromise after reboot, but it would not protect credentials found in memory evidence.

Question 695

A responder transfers a disk image to external counsel without recording the handoff. What is the MOST appropriate analyst action based on the evidence?

  1. Reject the altered copy for conclusions and reacquire or verify original integrity.
  2. Coordinate an authorized preservation hold on the scoped custodians and data.
  3. Document transfer time, custodian, purpose and integrity hash immediately.
  4. Create a verified working copy and preserve the original unchanged.

Explanation

Correct Answer

C:

Evidence custody must remain accountable across handling events. Repair missing forensic evidence handoff record.

Incorrect Answers

A:

Evidence mismatch undermines confidence in content preservation. It could help detect corrupted evidence transfer, but it would not repair missing forensic evidence handoff record.

B:

Legal preservation overrides ordinary destruction for relevant material. That is relevant to chain of custody under incident response, not to repair missing forensic evidence handoff record.

D:

Analytical actions should not modify the primary evidence. It could help preserve original disk image integrity, but it would not repair missing forensic evidence handoff record.

Question 696

Two copies of a forensic archive yield different SHA-256 hashes after transit. Which next step is MOST defensible for the security team?

  1. Coordinate an authorized preservation hold on the scoped custodians and data.
  2. Document transfer time, custodian, purpose and integrity hash immediately.
  3. Create a verified working copy and preserve the original unchanged.
  4. Reject the altered copy for conclusions and reacquire or verify original integrity.

Explanation

Correct Answer

D:

Evidence mismatch undermines confidence in content preservation. Detect corrupted evidence transfer.

Incorrect Answers

A:

Legal preservation overrides ordinary destruction for relevant material. That is relevant to chain of custody under incident response, not to detect corrupted evidence transfer.

B:

Evidence custody must remain accountable across handling events. It would repair missing forensic evidence handoff record, but it would not detect corrupted evidence transfer.

C:

Analytical actions should not modify the primary evidence. It could help preserve original disk image integrity, but it would not detect corrupted evidence transfer.

Question 697

A person has legitimate access to a sensitive dataset and downloads it for an approved project. Which action BEST aligns with sound security operations?

  1. Confirm business authorization and project context before classifying malicious intent.
  2. Revoke applicable sessions and delegated access and check for subsequent cloud use.
  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

A:

Legitimate data access can resemble exfiltration without policy context. Distinguish authorized bulk data movement.

Incorrect Answers

B:

Physical device control alone cannot stop already-issued cloud credentials. It could help eradicate insider retained cloud access, but it would not distinguish authorized bulk data movement.

C:

Broad unrelated collection undermines proportionate incident handling. That is relevant to insider data theft investigation, not to distinguish authorized bulk data movement.

D:

Insider investigation requires provenance and privacy-aware governance. It would investigate suspected departing employee exfiltration, but it would not distinguish authorized bulk data movement.

Question 698

Kerberos ticket activity suggests harvesting but no successful remote sessions are recorded. Which response BEST addresses the security problem described?

  1. Isolate the source and restrict abused credentials while collecting authentication history.
  2. Preserve ticket request evidence and investigate potential offline credential exposure.
  3. Identify originating identity and isolate affected endpoints before coordinated eradication.
  4. Rotate and restrict the service credential across all dependent hosts.

Explanation

Correct Answer

B:

Ticket requests can indicate preparation without confirmed server compromise. Scope potential Kerberoasting activity.

Incorrect Answers

A:

Active privilege use across hosts requires immediate containment. It could help contain credential-driven lateral spread, but it would not scope potential Kerberoasting activity.

C:

Remote management execution can rapidly distribute payloads. It would contain WMI-based lateral execution, but it would not scope potential Kerberoasting activity.

D:

Residual shared credentials can reopen lateral access after host cleanup. It could help eradicate shared credential persistence, but it would not scope potential Kerberoasting activity.

Question 699

A remediation team removes the malicious package but leaves the compromised updater credential active. Which investigative or response action BEST fits the evidence?

  1. Revoke deployment approvals and block the identified package/version.
  2. Pause update distribution and scope installed versions using signed package and EDR evidence.
  3. Rotate updater credentials and verify release infrastructure integrity.
  4. Preserve signed binaries and reconcile build provenance with the vendor's trusted statement.

Explanation

Correct Answer

C:

Supply-chain incidents can recur if the distribution authority stays compromised. Eradicate supplier release credential persistence.

Incorrect Answers

A:

Preventing pending installations limits future spread. That is relevant to supply-chain malware incident, not to eradicate supplier release credential persistence.

B:

Trusted distribution paths can propagate compromised build artifacts. It would contain malicious supplier update rollout, but it would not eradicate supplier release credential persistence.

D:

Signature validity does not guarantee a build pipeline was uncompromised. That is relevant to supply-chain malware incident, not to eradicate supplier release credential persistence.

Question 700

A suspicious process is running on an encrypted laptop scheduled for shutdown. What is the MOST appropriate analyst action based on the evidence?

  1. Apply approved secure transfer, limited access and confidentiality handling.
  2. Coordinate a minimally disruptive approved acquisition with integrity verification.
  3. Reacquire and verify from trusted source rather than use an inconsistent image.
  4. Collect authorized volatile evidence and recovery-key information before power loss.

Explanation

Correct Answer

D:

Shutdown can lose memory-only evidence and complicate encrypted storage access. Preserve live evidence before laptop shutdown.

Incorrect Answers

A:

Memory captures can contain credentials and sensitive business information. It would govern external sharing of volatile evidence, but it would not preserve live evidence before laptop shutdown.

B:

Evidence collection must preserve availability and chain of custody. It could help acquire disk evidence from critical server safely, but it would not preserve live evidence before laptop shutdown.

C:

Source/destination hash mismatch undermines forensic reliability. That is relevant to endpoint evidence acquisition order, not to preserve live evidence before laptop shutdown.


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