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CompTIA CS0-003 Practice Test 78

Question 770

A responder needs a forensic disk copy from a running critical server. 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

B:

Evidence collection must preserve availability and chain of custody. Acquire disk evidence from critical server safely.

Incorrect Answers

A:

Memory captures can contain credentials and sensitive business information. It could help govern external sharing of volatile evidence, but it would not acquire disk evidence from critical server safely.

C:

Source/destination hash mismatch undermines forensic reliability. It would resolve forensic disk hash mismatch, but it would not acquire disk evidence from critical server safely.

D:

Shutdown can lose memory-only evidence and complicate encrypted storage access. It could help preserve live evidence before laptop shutdown, but it would not acquire disk evidence from critical server safely.

Question 771

A host's services recovered but operational owners report failed financial reconciliations. Which next step is MOST defensible for the security team?

  1. Verify actual endpoint network state and record the action acknowledgment.
  2. Validate credentials, sessions and persistence removal before closure.
  3. Hold closure and correct data-integrity issues with business stakeholders.
  4. Attach source event references and distinguish observations from analyst hypotheses.

Explanation

Correct Answer

C:

Technical uptime does not prove business recovery. Prevent premature incident closure with business errors.

Incorrect Answers

A:

Verifying actual endpoint network state and recording the action acknowledgment would not hold closure and correct data-integrity issues with business stakeholders. Technical uptime does not prove business recovery.

B:

Malware cleanup is incomplete if identity footholds remain. It would check identity persistence before closing malware case, but it would not prevent premature incident closure with business errors.

D:

Attaching source event references and distinguishing observations from analyst hypotheses would not hold closure and correct data-integrity issues with business stakeholders.

Question 772

A DNS log lacks host attribution because recursive resolvers use shared upstream IPs. Which action BEST aligns with sound security operations?

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

Explanation

Correct Answer

D:

Upstream IPs may identify a resolver rather than an infected endpoint. Attribute DNS tunneling to originating host.

Incorrect Answers

A:

DNS tunneling can carry data or commands via normal resolver paths. It would contain suspected DNS tunneling, but it would not attribute DNS tunneling to originating host.

B:

Blocking one domain may not stop an adaptive rendezvous mechanism. It could help follow residual DGA C2 after sinkhole, but it would not attribute DNS tunneling to originating host.

C:

Broad DNS record-type bans can break validation and service discovery. That is relevant to malicious dns command-and-control, not to attribute DNS tunneling to originating host.

Question 773

A cloud provider controls infrastructure logs that the customer cannot collect directly. Which response BEST addresses the security problem described?

  1. Request available provider evidence using the contracted incident response channel.
  2. Invoke contractual incident notification and restrict supplier access while assessing exposure.
  3. Obtain authorized incident cooperation and scope rather than initiating unapproved probing.
  4. Validate actual sessions and entitlement paths before broadening affected-account count.

Explanation

Correct Answer

A:

Shared responsibility requires provider coordination for inaccessible telemetry. Obtain provider-controlled cloud incident logs.

Incorrect Answers

B:

Shared privileged connections require timely coordinated containment. That is relevant to third-party response and coordination, not to obtain provider-controlled cloud incident logs.

C:

Incident response does not grant unrestricted access to external networks. It would respect third-party forensic scope, but it would not obtain provider-controlled cloud incident logs.

D:

Exposure estimates must reflect confirmed evidence. It could help scope supplier account compromise accurately, but it would not obtain provider-controlled cloud incident logs.

Question 774

A fraudulent transfer was completed before the compromise was discovered. Which investigative or response action BEST fits the evidence?

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

Explanation

Correct Answer

B:

Timely reporting may limit irreversible financial impact. Respond to completed BEC transfer.

Incorrect Answers

A:

Spoofed appearance is not proof the named executive's account was accessed. That is relevant to business email compromise, not to respond to completed BEC transfer.

C:

BEC relies on social authority and urgency rather than necessarily malicious attachments. It could help block BEC payment redirection, but it would not respond to completed BEC transfer.

D:

Server-side rules are a common persistence and exfiltration mechanism. That is relevant to business email compromise, not to respond to completed BEC transfer.

Question 775

A threat bulletin lists a malware infrastructure set matching one confirmed endpoint connection. What is the MOST appropriate analyst action based on the evidence?

  1. Hunt behavioral persistence patterns to find related cases beyond hashes.
  2. Use process, URL and certificate context before blocking or attributing a campaign.
  3. Hunt related indicators and TTPs across relevant endpoints while retaining confidence boundaries.
  4. Continue locally grounded containment with available telemetry and document enrichment gaps.

Explanation

Correct Answer

C:

IOC matches can guide broader scoping without proving every host is infected. Expand incident scope through corroborated intelligence.

Incorrect Answers

A:

TTP-based scoping can detect variants missed by exact signatures. It would scope malware variants through behavior, but it would not expand incident scope through corroborated intelligence.

B:

Shared infrastructure can produce misleading associations. It could help avoid indiscriminate cloud IP threat blocking, but it would not expand incident scope through corroborated intelligence.

D:

Response should not stall solely because an external context service fails. It would maintain incident response without threat feed, but it would not expand incident scope through corroborated intelligence.

Question 776

Finance receives a forged executive request to wire money to a new account. Which next step is MOST defensible for the security team?

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

Explanation

Correct Answer

D:

BEC relies on social authority and urgency rather than necessarily malicious attachments. Block BEC payment redirection.

Incorrect Answers

A:

Spoofed appearance is not proof the named executive's account was accessed. It could help distinguish spoofing from mailbox account compromise, but it would not block BEC payment redirection.

B:

Timely reporting may limit irreversible financial impact. That is relevant to business email compromise, not to block BEC payment redirection.

C:

Server-side rules are a common persistence and exfiltration mechanism. It would contain malicious mailbox forwarding, but it would not block BEC payment redirection.

Question 777

Backups are available but the last nightly snapshot was encrypted by an attacker. 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

A:

Restoration from compromised backups can reintroduce malicious or damaged data. Choose clean ransomware recovery point.

Incorrect Answers

B:

Removing files alone does not remove stolen identity access. It would verify ransomware eradication includes credentials, but it would not choose clean ransomware recovery point.

C:

Reimaging before collection can erase indicators needed for scope and root cause. It could help preserve ransomware forensic evidence, but it would not choose clean ransomware recovery point.

D:

Immediate propagation control limits additional encryption damage. That is relevant to ransomware outbreak response, not to choose clean ransomware recovery point.

Question 778

The key is revoked but its permissions were broader than business need. Which response BEST addresses the security problem described?

  1. Disable the leaked key and preserve cloud audit evidence of its use.
  2. Restrict replacement service policy and monitor for similar exposure in the build process.
  3. Distinguish enumeration from successful retrieval using API outcomes and byte counts.
  4. Coordinate an approved replacement identity and secret rotation before removing emergency controls.

Explanation

Correct Answer

B:

Correcting entitlement and secret handling reduces repeat compromise likelihood. Harden cloud key after containment.

Incorrect Answers

A:

Public credential disclosure plus misuse warrants prompt containment. It would contain exposed cloud access key, but it would not harden cloud key after containment.

C:

Evidence does not justify claiming data exfiltration when reads failed. That is relevant to cloud access-key exposure, not to harden cloud key after containment.

D:

Business continuity must be protected without keeping stolen credentials active. It would rotate compromised integration secret safely, but it would not harden cloud key after containment.

Question 779

A disk image was verified at collection but later opened and modified in the investigation lab. Which investigative or response action BEST fits the evidence?

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

Explanation

Correct Answer

C:

Evidence working copies should not replace untouched originals. Recover from altered working forensic image.

Incorrect Answers

A:

Context is necessary to authenticate ephemeral screen evidence. It could help document console screenshot provenance, but it would not recover from altered working forensic image.

B:

Ambiguous artifact identity can break evidence traceability. That is relevant to digital evidence legal preservation, not to recover from altered working forensic image.

D:

Preservation obligations take precedence over routine deletion schedules. It could help preserve incident evidence under legal hold, but it would not recover from altered working forensic image.

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.


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