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CompTIA CS0-003 Practice Test 13

Question 120

Windows defender exclusions change immediately after a suspicious admin token is used. What is the MOST appropriate analyst action based on the evidence?

  1. Revoke the unauthorized key and identify who modified the account file.
  2. Reconstruct ACL changes and correlate file reads with transfer records.
  3. Isolate the host promptly and preserve process and file-rename evidence.
  4. Correlate exclusion modification, token privileges and subsequent file activity.

Explanation

Correct Answer

D:

Attackers may weaken protection to stage malicious executables. Detect endpoint protection exclusion tampering.

Incorrect Answers

A:

Added trust keys can provide ongoing access without password events. That is relevant to file-system and registry anomalies, not to detect endpoint protection exclusion tampering.

B:

Unauthorized permissions plus exfiltration activity suggests deliberate staging. It would investigate file-share permission abuse, but it would not detect endpoint protection exclusion tampering.

C:

Rapid mass renaming plus extortion artifacts signals probable ransomware. It could help respond to ransomware file-change signature, but it would not detect endpoint protection exclusion tampering.

Question 121

One workstation attempts SMB sessions to 240 internal servers in minutes. Which next step is MOST defensible for the security team?

  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. Trace remote execution accounts, originating host and process lineage.
  4. Review account purpose, tickets and remote session activity for credential abuse.

Explanation

Correct Answer

A:

Broad horizontal probing over SMB may precede lateral movement. Distinguish SMB sweep from approved discovery.

Incorrect Answers

B:

Abnormal bulk service-ticket requests may indicate offline password-cracking preparation. It could help evaluate Kerberos service-ticket harvesting, but it would not distinguish SMB sweep from approved discovery.

C:

Coordinated WMI process creation across hosts suggests remote execution spread. That is relevant to east-west lateral movement, not to distinguish SMB sweep from approved discovery.

D:

Unusual privilege reach and time can indicate compromised service credentials. It would triage abnormal service account lateral reach, but it would not distinguish SMB sweep from approved discovery.

Question 122

A database cache uses high CPU after a planned query-index change. Which action BEST aligns with sound security operations?

  1. Collect process memory and creation data to identify the source of resource exhaustion.
  2. Compare approved change timing and query telemetry before treating usage as cryptomining.
  3. Examine injection evidence and source process trust before declaring a fileless compromise.
  4. Preserve crash and driver load artifacts and block unapproved kernel components.

Explanation

Correct Answer

B:

Performance anomalies may arise from authorized application changes. Distinguish workload spike from suspicious process.

Incorrect Answers

A:

Memory growth with process churn can signal malicious code or faulty services. It could help investigate host memory exhaustion, but it would not distinguish workload spike from suspicious process.

C:

Process injection can bypass simple file hash detections. It would triage executable memory injection, but it would not distinguish workload spike from suspicious process.

D:

Privileged driver execution can compromise host integrity beyond ordinary user code. It could help investigate suspicious kernel driver loading, but it would not distinguish workload spike from suspicious process.

Question 123

A server becomes unavailable while upstream SYN counts surge and completed handshakes collapse. Which response BEST addresses the security problem described?

  1. Correlate database change time, pool errors and transaction latency before calling it an attack.
  2. Assess traffic distribution and application resource saturation before applying rate limits.
  3. Examine SYN backlog and source distribution, then activate appropriate SYN-flood protection.
  4. Isolate the rogue bridge and validate spanning-tree and loop prevention telemetry.

Explanation

Correct Answer

C:

Unfinished TCP handshakes can exhaust connection state resources. Identify TCP SYN flooding.

Incorrect Answers

A:

Service interruption alone is insufficient to prove hostile traffic. That is relevant to network denial and disruption, not to identify TCP SYN flooding.

B:

Distributed request floods require distinction from legitimate demand spikes. It would triage distributed application-layer denial, but it would not identify TCP SYN flooding.

D:

Layer-two loops can overwhelm a LAN without any attacker C2 traffic. That is relevant to network denial and disruption, not to identify TCP SYN flooding.

Question 124

A login endpoint shows many requests with SQL metacharacters and database syntax errors. Which investigative or response action BEST fits the evidence?

  1. Inspect reflected parameters and output encoding for cross-site scripting.
  2. Inspect web server request logs and test whether path canonicalization permits traversal.
  3. Review per-object authorization and token activity for broken object-level access control.
  4. Correlate request payloads with database errors and investigate possible injection.

Explanation

Correct Answer

D:

Error-based SQL injection may expose query construction weaknesses. Triage SQL injection probe behavior.

Incorrect Answers

A:

Unescaped user input rendered into pages can enable script execution. It would detect reflected XSS in search responses, but it would not triage SQL injection probe behavior.

B:

Encoded traversal attempts target files outside the intended web root. It could help recognize directory traversal attack indicator, but it would not triage SQL injection probe behavior.

C:

Authentication alone does not ensure authorization for each requested object. That is relevant to web application abnormal activity, not to triage SQL injection probe behavior.

Question 125

A logon script GPO was edited by an account outside the change-management group. What is the MOST appropriate analyst action based on the evidence?

  1. Preserve directory policy-change events and inspect deployed scripts for unauthorized execution.
  2. Correlate event clear records and privileged logon sources; preserve off-host copies.
  3. Correct filesystem permissions and verify integrity of the deployed scanner.
  4. Inspect registry associations and recent installers for command hijacking persistence.

Explanation

Correct Answer

A:

Domain logon scripts can distribute malicious commands widely. Triage unauthorized GPO startup script change.

Incorrect Answers

B:

Audit-log clearing is a defense-evasion signal and local evidence may be incomplete. That is relevant to registry and file tamper chain, not to triage unauthorized GPO startup script change.

C:

Writable trusted tool paths can allow future binary replacement. It would fix writable trusted executable path, but it would not triage unauthorized GPO startup script change.

D:

Modified file-association handlers can execute attacker code during ordinary actions. It could help detect file association hijack, but it would not triage unauthorized GPO startup script change.

Question 126

An internet honeypot records repeated SSH passwords followed by a new malware download. Which next step is MOST defensible for the security team?

  1. Confirm the approved engagement scope and timing before downgrading severity.
  2. Preserve the interaction sequence and isolate honeypot telemetry from production credentials.
  3. Check first-seen, last-seen and current service ownership before taking action.
  4. Investigate the source process and destination response pattern for network sweep activity.

Explanation

Correct Answer

B:

Decoy interaction can reveal attack behavior but must not introduce real access. Analyze honeypot credential attack sequence.

Incorrect Answers

A:

Authorized assessment traffic can resemble hostile reconnaissance. That is relevant to honeypot and reconnaissance indicators, not to analyze honeypot credential attack sequence.

C:

Reputation can become stale when infrastructure addresses are reassigned. It could help challenge stale indicator attribution, but it would not analyze honeypot credential attack sequence.

D:

Ordered horizontal probing suggests enumeration and possible pivot preparation. That is relevant to honeypot and reconnaissance indicators, not to analyze honeypot credential attack sequence.

Question 127

A cloud storage bucket receives thousands of object read attempts from one identity with many 403 errors. Which action BEST aligns with sound security operations?

  1. Mask sensitive configuration values in logs and rotate the leaked token.
  2. Compare IAM policy changes and denied API operations with expected application permissions.
  3. Correlate denied object paths and identity permissions for enumeration attempts.
  4. Check expiration, audience restrictions and access patterns for link leakage.

Explanation

Correct Answer

C:

Systematic 403 access patterns can signal attempts to locate accessible sensitive objects. Triage cloud object enumeration with denials.

Incorrect Answers

A:

Logging secrets can expose credentials to broad observer groups. It would remediate cloud function secret in logs, but it would not triage cloud object enumeration with denials.

B:

Unexpected access denial may reflect legitimate least privilege or a broken deployment. It could help diagnose cloud permission regression, but it would not triage cloud object enumeration with denials.

D:

Bearer URLs can be reused if not appropriately scoped or short-lived. It would investigate exposed object pre-signed URL, but it would not triage cloud object enumeration with denials.

Question 128

An attacker-like executable launches from an email cache folder but EDR only shows a blocked attempt. Which response BEST addresses the security problem described?

  1. Inspect extension publisher, permissions and deployment source before disabling suspected abuse.
  2. Preserve the hosts-file modification and restore known trusted name resolution.
  3. Compare golden image hash and deployment change record before declaring distributed malware.
  4. Verify actual process creation and child actions rather than assuming execution.

Explanation

Correct Answer

D:

Prevention events do not necessarily indicate successful payload launch. Establish whether blocked email payload executed.

Incorrect Answers

A:

Browser extensions can read sensitive web data when granted sweeping permissions. It could help investigate unapproved broad-permission browser extension, but it would not establish whether blocked email payload executed.

B:

Host-file tampering can redirect sensitive requests outside DNS controls. That is relevant to suspicious persistence across endpoints, not to establish whether blocked email payload executed.

C:

Shared deployment error can explain coordinated startup changes across devices. It would distinguish image rollout change from distributed compromise, but it would not establish whether blocked email payload executed.

Question 129

A cron entry appears for root and executes a binary from a writable directory. Which investigative or response action BEST fits the evidence?

  1. Check cron change audit logs, file ownership and binary hash against change records.
  2. Correlate HTTP request parameters with process executions and application vulnerability evidence.
  3. Inspect process arguments, image provenance and external mining-pool connections.
  4. Inspect process ancestry, accepted sessions and destination network flow for shell access.

Explanation

Correct Answer

A:

Privileged persistence in writable locations is high risk without authorization. Triage malicious root cron persistence.

Incorrect Answers

B:

Web-server children executing shells suggest possible command injection. It would detect web application command execution, but it would not triage malicious root cron persistence.

C:

Sustained compute consumption can reflect cryptojacking, but resource evidence needs attribution. It could help investigate suspected cryptominer activity, but it would not triage malicious root cron persistence.

D:

Service-child behavior can indicate exploit-driven command execution or abused SSH sessions. That is relevant to linux compromise indicators, not to triage malicious root cron persistence.

Question 130

A workstation's system hosts file redirects internal update sites to unknown public IPs. What is the MOST appropriate analyst action based on the evidence?

  1. Compare golden image hash and deployment change record before declaring distributed malware.
  2. Preserve the hosts-file modification and restore known trusted name resolution.
  3. Inspect extension publisher, permissions and deployment source before disabling suspected abuse.
  4. Verify actual process creation and child actions rather than assuming execution.

Explanation

Correct Answer

B:

Host-file tampering can redirect sensitive requests outside DNS controls. Identify endpoint hosts-file redirection.

Incorrect Answers

A:

Shared deployment error can explain coordinated startup changes across devices. It would distinguish image rollout change from distributed compromise, but it would not identify endpoint hosts-file redirection.

C:

Browser extensions can read sensitive web data when granted sweeping permissions. That is relevant to suspicious persistence across endpoints, not to identify endpoint hosts-file redirection.

D:

Prevention events do not necessarily indicate successful payload launch. It would establish whether blocked email payload executed, but it would not identify endpoint hosts-file redirection.


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