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CompTIA CS0-003 Practice Test 75

Question 740

A firewall records an outbound transfer but proxy logs have a missing ten-minute window. What is the MOST appropriate analyst action based on the evidence?

  1. Distinguish attempted authentication, accepted sessions and observed execution by host.
  2. Label competing hypotheses and prioritize collection of earliest reliable evidence.
  3. Normalize event timestamps and account for host clock drift before timeline sequencing.
  4. Preserve the gap and corroborate with endpoint and NetFlow counters.

Explanation

Correct Answer

D:

Missing data should be explicitly bounded instead of filled with assumptions. Handle forensic timeline visibility gap.

Incorrect Answers

A:

Scope estimates should reflect confirmed stages rather than one aggregated count. It could help classify attempted versus executed lateral access, but it would not handle forensic timeline visibility gap.

B:

An unproven initial access story must not be promoted to fact. That is relevant to timeline and scope reconstruction, not to handle forensic timeline visibility gap.

C:

Inconsistent time bases can reverse apparent attack order. It would reconstruct accurate cross-sensor incident timeline, but it would not handle forensic timeline visibility gap.

Question 741

Several related messages are blocked but the executive mailbox itself shows no compromise. Which next step is MOST defensible for the security team?

  1. Distinguish impersonation from takeover and review sender authentication evidence.
  2. Verify the payment instruction through a trusted independent channel before any transfer.
  3. Initiate authorized financial recall procedures and notify legal and banking contacts promptly.
  4. Disable the forwarding rule, revoke sessions and preserve mailbox audit records.

Explanation

Correct Answer

A:

Spoofed appearance is not proof the named executive's account was accessed. Distinguish spoofing from mailbox account compromise.

Incorrect Answers

B:

BEC relies on social authority and urgency rather than necessarily malicious attachments. It would block BEC payment redirection, but it would not distinguish spoofing from mailbox account compromise.

C:

Timely reporting may limit irreversible financial impact. It could help respond to completed BEC transfer, but it would not distinguish spoofing from mailbox account compromise.

D:

Server-side rules are a common persistence and exfiltration mechanism. That is relevant to business email compromise, not to distinguish spoofing from mailbox account compromise.

Question 742

A sensitive database server transfers unusually large archives to an unsanctioned external host. Which action BEST aligns with sound security operations?

  1. Report attempted transfer separately from confirmed completed export.
  2. Restrict the outbound route and preserve flow, account and file-access evidence.
  3. Revoke the credential and inspect alternate data access routes.
  4. Investigate source files and process lineage despite encrypted transport or archive content.

Explanation

Correct Answer

B:

Active suspicious bulk transfer needs prompt containment and scope collection. Contain ongoing database data exfiltration.

Incorrect Answers

A:

Denial telemetry cannot establish successful exfiltration. It would distinguish blocked transfer attempt from success, but it would not contain ongoing database data exfiltration.

C:

Network containment alone does not eliminate stolen application credentials. That is relevant to network exfiltration response, not to contain ongoing database data exfiltration.

D:

Encryption does not make an unauthorized transfer harmless. It would evaluate encrypted exfiltration artifact, but it would not contain ongoing database data exfiltration.

Question 743

After a code fix, only unit tests pass while production access policy is unchanged. Which response BEST addresses the security problem described?

  1. Reconcile successful object-read logs and impacted identifiers before estimating victims.
  2. Disable the affected route or restrict access while preserving tenant-specific audit records.
  3. Validate end-to-end object authorization under representative user roles.
  4. Analyze block logs and confirm no successful backend effect before incident declaration.

Explanation

Correct Answer

C:

Security remediation needs effective deployed control verification. Verify cross-tenant API fix in runtime.

Incorrect Answers

A:

Notification scope must track confirmed data access rather than guess. It could help quantify affected API tenants accurately, but it would not verify cross-tenant API fix in runtime.

B:

Confirmed broken authorization risks immediate data exposure. That is relevant to application api attack response, not to verify cross-tenant API fix in runtime.

D:

Observed attempts do not automatically establish server compromise. It could help distinguish blocked API exploit from successful execution, but it would not verify cross-tenant API fix in runtime.

Question 744

Systems return online after reimaging but no one has tested whether credential persistence remains. Which investigative or response action BEST fits the evidence?

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

Explanation

Correct Answer

D:

Removing files alone does not remove stolen identity access. Verify ransomware eradication includes credentials.

Incorrect Answers

A:

Reimaging before collection can erase indicators needed for scope and root cause. That is relevant to ransomware outbreak response, not to verify ransomware eradication includes credentials.

B:

Immediate propagation control limits additional encryption damage. It would contain active ransomware spread, but it would not verify ransomware eradication includes credentials.

C:

Restoration from compromised backups can reintroduce malicious or damaged data. It could help choose clean ransomware recovery point, but it would not verify ransomware eradication includes credentials.

Question 745

The collection tool reports a different hash after writing the image to evidence storage. What is the MOST appropriate analyst action based on the evidence?

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

Explanation

Correct Answer

A:

Source/destination hash mismatch undermines forensic reliability. Resolve forensic disk hash mismatch.

Incorrect Answers

B:

Shutdown can lose memory-only evidence and complicate encrypted storage access. It could help preserve live evidence before laptop shutdown, but it would not resolve forensic disk hash mismatch.

C:

Evidence collection must preserve availability and chain of custody. That is relevant to endpoint evidence acquisition order, not to resolve forensic disk hash mismatch.

D:

Memory captures can contain credentials and sensitive business information. It would govern external sharing of volatile evidence, but it would not resolve forensic disk hash mismatch.

Question 746

A suspect domain is sinkholed, but the endpoint still tries alternate generated names. Which next step is MOST defensible for the security team?

  1. Correlate resolver client logs with endpoint telemetry before naming source machines.
  2. Hunt for related process behavior and additional generated destinations.
  3. Apply scoped domain controls and monitor required legitimate TXT use.
  4. Isolate suspicious egress and preserve DNS and process telemetry.

Explanation

Correct Answer

B:

Blocking one domain may not stop an adaptive rendezvous mechanism. Follow residual DGA C2 after sinkhole.

Incorrect Answers

A:

Upstream IPs may identify a resolver rather than an infected endpoint. It could help attribute DNS tunneling to originating host, but it would not follow residual DGA C2 after sinkhole.

C:

Broad DNS record-type bans can break validation and service discovery. It would limit DNS-tunnel containment scope, but it would not follow residual DGA C2 after sinkhole.

D:

DNS tunneling can carry data or commands via normal resolver paths. It could help contain suspected DNS tunneling, but it would not follow residual DGA C2 after sinkhole.

Question 747

A forensic report cites employee personal messages unrelated to the incident. Which action BEST aligns with sound security operations?

  1. Restrict access and redact unnecessary PII before broader technical sharing.
  2. Apply scoped acquisition and controlled evidence storage with legal and privacy approval.
  3. Minimize irrelevant material in the shared report while preserving authorized evidence.
  4. Sanitize or aggregate data before sharing on approved channels.

Explanation

Correct Answer

C:

Reporting should match the legitimate investigative purpose. Exclude irrelevant private communication.

Incorrect Answers

A:

Malware analysis data can include sensitive real-user records. That is relevant to malware evidence versus pii handling, not to exclude irrelevant private communication.

B:

Response urgency does not remove handling and retention duties. It would govern compromised mailbox collection, but it would not exclude irrelevant private communication.

D:

External disclosure can create a separate data exposure incident. That is relevant to malware evidence versus pii handling, not to exclude irrelevant private communication.

Question 748

A recovered subnet still trusts a service account whose password was present in attacker logs. Which response BEST addresses the security problem described?

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

Explanation

Correct Answer

D:

Residual shared credentials can reopen lateral access after host cleanup. Eradicate shared credential persistence.

Incorrect Answers

A:

Ticket requests can indicate preparation without confirmed server compromise. It would scope potential Kerberoasting activity, but it would not eradicate shared credential persistence.

B:

Remote management execution can rapidly distribute payloads. It could help contain WMI-based lateral execution, but it would not eradicate shared credential persistence.

C:

Active privilege use across hosts requires immediate containment. That is relevant to credential-based lateral movement, not to eradicate shared credential persistence.

Question 749

Traffic returns to normal but the team has no proof attack mitigations worked. Which investigative or response action BEST fits the evidence?

  1. Compare service availability, malicious request rates and customer success metrics.
  2. Activate approved edge rate limiting or upstream mitigation with service owners.
  3. Restrict origin access to trusted edge infrastructure.
  4. Evaluate legitimate customer impact and use traffic behavior controls instead.

Explanation

Correct Answer

A:

Recovery decisions need actual service outcome evidence. Validate DDoS mitigation effectiveness.

Incorrect Answers

B:

Distributed attack traffic should be absorbed before exhausting application resources. That is relevant to ddos response coordination, not to validate DDoS mitigation effectiveness.

C:

Attackers can bypass CDN protection when origins remain directly exposed. It would close DDoS origin bypass, but it would not validate DDoS mitigation effectiveness.

D:

Broad geographic blocking can cause unnecessary disruption. It could help avoid overbroad DDoS geographic containment, but it would not validate DDoS mitigation effectiveness.

Question 750

A compromised service account accesses 40 hosts but only five show successful command execution. What is the MOST appropriate analyst action based on the evidence?

  1. Label competing hypotheses and prioritize collection of earliest reliable evidence.
  2. Distinguish attempted authentication, accepted sessions and observed execution by host.
  3. Normalize event timestamps and account for host clock drift before timeline sequencing.
  4. Preserve the gap and corroborate with endpoint and NetFlow counters.

Explanation

Correct Answer

B:

Scope estimates should reflect confirmed stages rather than one aggregated count. Classify attempted versus executed lateral access.

Incorrect Answers

A:

An unproven initial access story must not be promoted to fact. That is relevant to timeline and scope reconstruction, not to classify attempted versus executed lateral access.

C:

Inconsistent time bases can reverse apparent attack order. It could help reconstruct accurate cross-sensor incident timeline, but it would not classify attempted versus executed lateral access.

D:

Missing data should be explicitly bounded instead of filled with assumptions. That is relevant to timeline and scope reconstruction, not to classify attempted versus executed lateral access.


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