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CompTIA CS0-003 Practice Test 16

Question 150

A legitimate updater runs from the vendor directory but a child process loads a DLL from user temp. What is the MOST appropriate analyst action based on the evidence?

  1. Trace browser download, child process and task creation to establish the execution chain.
  2. Validate the DLL path, signature and parent load behavior for possible sideloading.
  3. Capture command arguments and mapped module evidence before host isolation.
  4. Examine the document macro, child command and network destination in the EDR timeline.

Explanation

Correct Answer

B:

Trusted parent processes can execute malicious libraries through unsafe search paths. Detect potential DLL sideloading.

Incorrect Answers

A:

Signed system tools can be abused for persistence after browser compromise. That is relevant to suspicious windows process trees, not to detect potential DLL sideloading.

C:

Living-off-the-land utilities can load unexpected content through valid binaries. It could help triage rundll32 remote module execution, but it would not detect potential DLL sideloading.

D:

Office-to-shell ancestry is suspicious when followed by external communication. That is relevant to suspicious windows process trees, not to detect potential DLL sideloading.

Question 151

A workstation sends large HTTPS uploads to a newly registered storage domain after working hours. Which next step is MOST defensible for the security team?

  1. Verify service account, approved job and object inventory before escalating.
  2. Compare inter-arrival patterns and process ownership with authorized heartbeat traffic.
  3. Correlate proxy destination, bytes transferred, user activity and endpoint file-access events.
  4. Preserve blocked transaction records and investigate the originating process and user.

Explanation

Correct Answer

C:

Transfer volume and destination age become meaningful when tied to endpoint actions. Investigate suspected web data exfiltration.

Incorrect Answers

A:

Expected backup activity can resemble exfiltration without operational context. It would distinguish scheduled backup from theft, but it would not investigate suspected web data exfiltration.

B:

Fixed cadence plus suspicious process lineage can indicate automated command-and-control beaconing. It could help test regular TLS beaconing hypothesis, but it would not investigate suspected web data exfiltration.

D:

Evasion-like retry behavior increases suspicion beyond one failed transfer. It would investigate attempted DLP circumvention, but it would not investigate suspected web data exfiltration.

Question 152

A backup service account launches an interactive terminal on a developer workstation. Which action BEST aligns with sound security operations?

  1. Compare session/device attribution and restrict the account to intended automation endpoints.
  2. Review task creator, command path and remote destination for persistence or beaconing.
  3. Trace creator identity, authorization path and post-creation use; disable if unauthorized.
  4. Investigate interactive logon type and account scope against the backup-job baseline.

Explanation

Correct Answer

D:

Service identities should not generally acquire unsolicited interactive sessions. Triage interactive service-account misuse.

Incorrect Answers

A:

Source deviation is material even when the account's scheduled jobs are legitimate. It could help identify reused maintenance credential, but it would not triage interactive service-account misuse.

B:

New recurring tasks can be an execution foothold when tied to unknown network calls. That is relevant to suspicious service accounts and scheduled jobs, not to triage interactive service-account misuse.

C:

Unapproved administrative principals can establish persistent privileged access. It would investigate rogue directory administrator creation, but it would not triage interactive service-account misuse.

Question 153

Web upload logs show repeated retries after a DLP block with different file names. Which response BEST addresses the security problem described?

  1. Preserve blocked transaction records and investigate the originating process and user.
  2. Compare inter-arrival patterns and process ownership with authorized heartbeat traffic.
  3. Correlate proxy destination, bytes transferred, user activity and endpoint file-access events.
  4. Verify service account, approved job and object inventory before escalating.

Explanation

Correct Answer

A:

Evasion-like retry behavior increases suspicion beyond one failed transfer. Investigate attempted DLP circumvention.

Incorrect Answers

B:

Fixed cadence plus suspicious process lineage can indicate automated command-and-control beaconing. It would test regular TLS beaconing hypothesis, but it would not investigate attempted DLP circumvention.

C:

Transfer volume and destination age become meaningful when tied to endpoint actions. It could help investigate suspected web data exfiltration, but it would not investigate attempted DLP circumvention.

D:

Expected backup activity can resemble exfiltration without operational context. That is relevant to http exfiltration indicators, not to investigate attempted DLP circumvention.

Question 154

Employees receive a fake QR code directing them to a credential-capture website. Which investigative or response action BEST fits the evidence?

  1. Verify payment changes through an independent known contact channel and review header alignment.
  2. Decode and assess the QR target safely, and search gateway logs for affected recipients.
  3. Inspect DMARC alignment and the original message headers before trusting the sender identity.
  4. Classify the social-engineering attempt and notify impacted identities to reject code sharing.

Explanation

Correct Answer

B:

Quishing hides a destination that still needs independent URL analysis. Investigate QR-code phishing.

Incorrect Answers

A:

Sender authentication success does not confirm legitimate business instructions. It would triage business email compromise lure, but it would not investigate QR-code phishing.

C:

Valid DKIM for a different domain does not establish aligned sender legitimacy. That is relevant to email lure and impersonation, not to investigate QR-code phishing.

D:

MFA one-time codes are authentication secrets that support fraudulent sign-ins. It would detect voice-based MFA social engineering, but it would not investigate QR-code phishing.

Question 155

A service account authenticates to many unrelated servers through remote management after midnight. What is the MOST appropriate analyst action based on the evidence?

  1. Investigate source process, authentication attempts and expected inventory scanning schedules.
  2. Examine ticket encryption types, request rates and follow-on activity for Kerberoasting.
  3. Review account purpose, tickets and remote session activity for credential abuse.
  4. Trace remote execution accounts, originating host and process lineage.

Explanation

Correct Answer

C:

Unusual privilege reach and time can indicate compromised service credentials. Triage abnormal service account lateral reach.

Incorrect Answers

A:

Broad horizontal probing over SMB may precede lateral movement. It could help distinguish SMB sweep from approved discovery, but it would not triage abnormal service account lateral reach.

B:

Abnormal bulk service-ticket requests may indicate offline password-cracking preparation. That is relevant to east-west lateral movement, not to triage abnormal service account lateral reach.

D:

Coordinated WMI process creation across hosts suggests remote execution spread. It could help identify WMI-based lateral execution, but it would not triage abnormal service account lateral reach.

Question 156

A newly registered OAuth application sends email via API on behalf of many staff users. Which next step is MOST defensible for the security team?

  1. Link cloud API creation, instance metadata and process telemetry to the initiating identity.
  2. Correlate the access-key identity, source network, bucket permissions and downloaded bytes.
  3. Review API audit caller and admission policy exceptions for privilege escalation.
  4. Check consent grants, effective scopes and outbound message records for abuse.

Explanation

Correct Answer

D:

Delegated app permissions enable mailbox operations without interactive sign-ins. Investigate malicious OAuth mail delegation.

Incorrect Answers

A:

Abuse can cross control-plane provisioning and guest execution. That is relevant to cloud abuse patterns, not to investigate malicious OAuth mail delegation.

B:

Unexpected mass object access may indicate stolen cloud credentials. It would triage suspicious cloud object enumeration, but it would not investigate malicious OAuth mail delegation.

C:

Container privilege requests are meaningful only with RBAC and admission context. It could help investigate unauthorized privileged pod launch, but it would not investigate malicious OAuth mail delegation.

Question 157

A Python script processing security logs assumes UTF-8 but encounters malformed bytes. Which action BEST aligns with sound security operations?

  1. Use an explicit decoding-error strategy and retain original bytes for forensic traceability.
  2. Parse JSON structurally and map source fields instead of using brittle text substring matches.
  3. Use an XML-aware parser with the correct namespace declarations.
  4. Use a bounded grep or awk filter against preserved copies of the original log.

Explanation

Correct Answer

A:

Silently dropping parse failures can remove key events from evidence. Handle invalid log encoding safely.

Incorrect Answers

B:

Correct structured parsing prevents loss or confusion of nested event attributes. It could help extract normalized source IP from JSON, but it would not handle invalid log encoding safely.

C:

Namespace handling is needed to retrieve fields reliably from XML records. That is relevant to shell and scripting for log extraction, not to handle invalid log encoding safely.

D:

Targeted text filtering accelerates triage without modifying primary evidence. It would isolate events by IP in Linux logs, but it would not handle invalid log encoding safely.

Question 158

An XML event feed contains namespaced event IDs that a string search misses. Which response BEST addresses the security problem described?

  1. Parse JSON structurally and map source fields instead of using brittle text substring matches.
  2. Use an XML-aware parser with the correct namespace declarations.
  3. Use an explicit decoding-error strategy and retain original bytes for forensic traceability.
  4. Use a bounded grep or awk filter against preserved copies of the original log.

Explanation

Correct Answer

B:

Namespace handling is needed to retrieve fields reliably from XML records. Parse XML security event namespaces.

Incorrect Answers

A:

Correct structured parsing prevents loss or confusion of nested event attributes. It could help extract normalized source IP from JSON, but it would not parse XML security event namespaces.

C:

Silently dropping parse failures can remove key events from evidence. It would handle invalid log encoding safely, but it would not parse XML security event namespaces.

D:

Targeted text filtering accelerates triage without modifying primary evidence. It could help isolate events by IP in Linux logs, but it would not parse XML security event namespaces.

Question 159

A phishing message reports DMARC fail while DKIM for an unrelated domain passes. Which investigative or response action BEST fits the evidence?

  1. Continue attachment and sender-behavior analysis rather than treating signature as safety.
  2. Validate the payment change through an independent trusted channel.
  3. Interpret DMARC alignment and quarantine according to approved policy.
  4. Inspect SPF authenticated domain and DMARC alignment to evaluate sender legitimacy.

Explanation

Correct Answer

C:

DMARC requires alignment with the visible From identity for SPF or DKIM. Apply DMARC to mismatched signer.

Incorrect Answers

A:

DKIM verifies signed origin/integrity, not benevolent content. That is relevant to email authentication headers, not to apply DMARC to mismatched signer.

B:

Reply-To manipulation and business process change create a high-risk impersonation pattern. It would investigate payment fraud reply-to change, but it would not apply DMARC to mismatched signer.

D:

SPF pass alone does not authenticate the user-visible From domain. That is relevant to email authentication headers, not to apply DMARC to mismatched signer.

Question 160

Analysts annotate a forensic timeline directly inside the original raw evidence file. What is the MOST appropriate analyst action based on the evidence?

  1. Obtain authorization and use approved private analysis instead of public submission.
  2. Use the approved isolated malware repository and restrict distribution by role.
  3. Redact or securely scope sensitive content before approved external transfer.
  4. Keep immutable originals and perform analysis on verified working copies.

Explanation

Correct Answer

D:

Editing source evidence undermines repeatability and integrity assertions. Keep original forensic artifacts immutable.

Incorrect Answers

A:

Public scanning portals may redistribute samples and expose confidential material. It would avoid public upload of proprietary executable, but it would not keep original forensic artifacts immutable.

B:

Uncontrolled sample transfer risks execution, data disclosure and evidence loss. It could help prevent unsafe malware sample distribution, but it would not keep original forensic artifacts immutable.

C:

Packet evidence may include secrets beyond those necessary for analysis. That is relevant to handling sensitive artifacts, not to keep original forensic artifacts immutable.


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