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CompTIA CS0-003 Practice Test 17

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.

Question 161

A SIEM alert describes a high-severity issue on a hostname no longer in inventory. Which next step is MOST defensible for the security team?

  1. Resolve the asset's stable ID and current ownership before paging the wrong team.
  2. Distinguish stored exposure from active execution when setting response severity.
  3. Chart source event time separately from ingestion time.
  4. Correlate NAT session identifiers before counting distinct attack paths.

Explanation

Correct Answer

A:

Stale hostnames can misroute urgent security work. Attribute alert to correct current asset owner.

Incorrect Answers

B:

File presence does not necessarily imply a running compromise. That is relevant to asset and log correlation under pressure, not to attribute alert to correct current asset owner.

C:

Late ingestion can create artificial apparent incident bursts. It would avoid ingestion-time spike misinterpretation, but it would not attribute alert to correct current asset owner.

D:

A translated flow can appear twice under different address pairs. It could help deduplicate NAT observation of same session, but it would not attribute alert to correct current asset owner.

Question 162

A suspicious destination is listed in a reputation feed with very old abuse reports. Which action BEST aligns with sound security operations?

  1. Inspect detections, sample behavior and false-positive history before escalation.
  2. Evaluate last-seen time, current ownership and independent corroboration before blocking.
  3. Check hosting context and target-specific behavior before using the score as conviction.
  4. Correlate registration age with URL content, mail headers and endpoint requests.

Explanation

Correct Answer

B:

Stale IP reputation can create false positives as ownership changes. Age and validate IP reputation data.

Incorrect Answers

A:

Aggregated antivirus verdicts vary and require evidentiary interpretation. That is relevant to threat reputation services, not to age and validate IP reputation data.

C:

Shared infrastructure reputation may not apply to every tenant on an address. It could help avoid shared-host reputation false positive, but it would not age and validate IP reputation data.

D:

Recent registration raises suspicion but does not independently prove malice. That is relevant to threat reputation services, not to age and validate IP reputation data.

Question 163

A spoofed invoice shows SPF pass for a mail relay but the visible From domain is different. Which response BEST addresses the security problem described?

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

Explanation

Correct Answer

C:

SPF pass alone does not authenticate the user-visible From domain. Validate SPF identifier alignment.

Incorrect Answers

A:

DKIM verifies signed origin/integrity, not benevolent content. It would distinguish DKIM authenticity from malware safety, but it would not validate SPF identifier alignment.

B:

DMARC requires alignment with the visible From identity for SPF or DKIM. It could help apply DMARC to mismatched signer, but it would not validate SPF identifier alignment.

D:

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 validate SPF identifier alignment.

Question 164

A file hash differs after benign recompilation although the application purpose remains unchanged. Which investigative or response action BEST fits the evidence?

  1. Use static strings analysis and verify whether the markers appear in related artifacts.
  2. Treat them as the same byte content pending verified acquisition and compare provenance.
  3. Continue behavior-based analysis instead of clearing the file as benign.
  4. Compare signer, build pipeline and behavior rather than relying solely on hash equality.

Explanation

Correct Answer

D:

Compilation and packaging changes alter hashes even without hostile intent. Prevent overreliance on file hash change.

Incorrect Answers

A:

Embedded text provides hypotheses without proving the code used every string. It could help interpret static strings as leads, but it would not prevent overreliance on file hash change.

B:

A cryptographic digest identifies content regardless of filename, assuming sound collection. That is relevant to file strings and hashing interpretation, not to prevent overreliance on file hash change.

C:

Reputation lookup absence is not proof of safety, especially for novel malware. It would handle unknown malware hash reputation, but it would not prevent overreliance on file hash change.

Question 165

A suspicious PDF contains a link annotation that is not visible as normal text. What is the MOST appropriate analyst action based on the evidence?

  1. Examine the document's embedded objects and hyperlinks without executing active content.
  2. Decode punycode and examine the actual registered domain before trusting appearance.
  3. Inspect macro and remote-template indicators in an isolated environment.
  4. Expand the redirect chain safely and inspect the final destination and certificate.

Explanation

Correct Answer

A:

Document metadata and annotations may carry concealed malicious destinations. Extract hidden PDF link without execution.

Incorrect Answers

B:

Unicode confusables can conceal attacker-controlled web properties. It would identify homograph phishing domain, but it would not extract hidden PDF link without execution.

C:

Document content can launch a payload chain without an obvious executable attachment. It could help analyze macro-driven remote template behavior, but it would not extract hidden PDF link without execution.

D:

URL shorteners conceal the ultimate recipient of credentials. That is relevant to email attachment and url analysis, not to extract hidden PDF link without execution.

Question 166

A SIEM rule joins VPN sign-ins to EDR events using usernames with inconsistent case. Which next step is MOST defensible for the security team?

  1. Narrow correlation windows using observed attack timings and clock accuracy.
  2. Normalize identity fields before running a time-bounded correlation.
  3. Validate normalized fields against raw source logs before trusting correlation results.
  4. Deduplicate source event IDs and validate ingestion pipelines before tuning severity.

Explanation

Correct Answer

B:

Field-format differences can hide otherwise related authentication and execution. Normalize identities for event join.

Incorrect Answers

A:

Overly broad joins can attribute unrelated user actions to execution. It would reduce false joins from broad time window, but it would not normalize identities for event join.

C:

Incorrect field extraction reverses directionality and contaminates detections. That is relevant to siem query correlation and time windows, not to normalize identities for event join.

D:

Ingestion duplication inflates alert counts without new adversary activity. It would correct duplicate SIEM alert source, but it would not normalize identities for event join.

Question 167

A malicious hash is observed on one host and responders need fleet scope. Which action BEST aligns with sound security operations?

  1. Correlate sensor-health events with privileged changes and network connectivity evidence.
  2. Build a process and persistence timeline from EDR telemetry and related user sessions.
  3. Query EDR for the same hash, signer and execution paths across managed endpoints.
  4. Validate the prevention outcome and inspect parent-child telemetry for successful follow-up.

Explanation

Correct Answer

C:

Enterprise-wide telemetry helps determine whether compromise is isolated. Expand detection across fleet by file indicators.

Incorrect Answers

A:

Security service tampering may masquerade as connectivity failure. It could help investigate deliberate EDR sensor disablement, but it would not expand detection across fleet by file indicators.

B:

Process lineage links initial execution to follow-on persistence. That is relevant to endpoint detection and response analysis, not to expand detection across fleet by file indicators.

D:

Block alerts are not proof that code ran successfully. It could help assess actual EDR prevention efficacy, but it would not expand detection across fleet by file indicators.

Question 168

A domain was registered yesterday and appears in a phish targeting finance users. Which response BEST addresses the security problem described?

  1. Evaluate last-seen time, current ownership and independent corroboration before blocking.
  2. Inspect detections, sample behavior and false-positive history before escalation.
  3. Check hosting context and target-specific behavior before using the score as conviction.
  4. Correlate registration age with URL content, mail headers and endpoint requests.

Explanation

Correct Answer

D:

Recent registration raises suspicion but does not independently prove malice. Contextualize WHOIS domain creation.

Incorrect Answers

A:

Stale IP reputation can create false positives as ownership changes. That is relevant to threat reputation services, not to contextualize WHOIS domain creation.

B:

Aggregated antivirus verdicts vary and require evidentiary interpretation. It would interpret mixed multi-engine file verdict, but it would not contextualize WHOIS domain creation.

C:

Shared infrastructure reputation may not apply to every tenant on an address. It could help avoid shared-host reputation false positive, but it would not contextualize WHOIS domain creation.

Question 169

A new detection rule is deployed without evaluating known benign automation events. Which investigative or response action BEST fits the evidence?

  1. Test rule output against documented benign and malicious examples before enabling paging.
  2. Anchor and constrain the expression to the actual malicious pattern with benign test cases.
  3. Implement case-insensitive matching and test equivalent command variants.
  4. Normalize address types and representation before aggregation.

Explanation

Correct Answer

A:

Rule validation should measure signal quality, not just successful execution. Reduce untested alert noise in detection rollout.

Incorrect Answers

B:

Overly permissive expressions create broad false positives. It could help refine overly broad URL regex, but it would not reduce untested alert noise in detection rollout.

C:

Command-line switches can vary capitalization without changing behavior. That is relevant to regex and detection engineering, not to reduce untested alert noise in detection rollout.

D:

Text formatting mismatches can hide related network entities. It would normalize address formats in SIEM rule, but it would not reduce untested alert noise in detection rollout.

Question 170

An analyst needs a capture of DNS queries on a headless Linux server without GUI access. What is the MOST appropriate analyst action based on the evidence?

  1. Apply a Wireshark stream filter and follow the matching TCP stream.
  2. Use a scoped tcpdump capture filter and preserve the output pcap.
  3. Confirm mirror-port direction and packet-loss counters before inferring a failed response.
  4. Minimize scope and restrict pcap access in accordance with evidence policy.

Explanation

Correct Answer

B:

Command-line packet capture can collect targeted traffic on headless systems. Capture DNS evidence via tcpdump.

Incorrect Answers

A:

Stream reassembly exposes application exchange across multiple packets. It could help reconstruct single HTTP exchange from pcap, but it would not capture DNS evidence via tcpdump.

C:

Sensor vantage point can omit reverse traffic when mirroring is incomplete. It would diagnose partial SPAN port visibility, but it would not capture DNS evidence via tcpdump.

D:

Packet payloads may contain sensitive authentication and personal data. It could help minimize sensitive packet evidence collection, but it would not capture DNS evidence via tcpdump.


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