ECCouncil 212-89 (EC-Council Certified Incident Handler) Practice Test 35

Question 340

A containment decision is required for this incident: An engineering team disables antivirus exclusions review because build tools occasionally create false positives. What action constrains the incident at the affected point of control?

  1. Restrict exposed administrative access and isolate endpoints using the same credentials
  2. Inspect endpoint policy scope and detections in excluded directories
  3. Tune specific false positives and verify legitimate build tasks still work
  4. Narrow or revoke unsafe exclusions after testing legitimate workloads

Explanation

Correct Answer

D:

Restoring visibility reduces malware concealment without needlessly blocking builds; this is a first-response safeguard for whether broad exclusions hide malware execution, not a substitute for full root-cause analysis.

Incorrect Answers

A:

The attacker should not retain easy access to parallel machines; this serves why one infected device can lead to many endpoint logins, whereas the requested result is initial containment or preservation involving whether broad exclusions hide malware execution.

B:

Unbounded exceptions can make attacker-controlled paths invisible; the requirement concerns whether broad exclusions hide malware execution, so investigation alone does not control current conditions.

C:

Precise policies improve both protection and availability; the goal is initial containment or preservation for whether broad exclusions hide malware execution. Corrective follow-through follows initial protection.

Question 341

The first task is to corroborate an alert. The case notes state: Several endpoints report unusual SMB connections and the same malicious process shortly after one laptop was infected. What should the investigator examine to distinguish a substantiated finding from an assumption?

  1. Correlate east-west SMB flow records with common payload hashes and process starts
  2. Clean or rebuild infected systems and remediate the exploited SMB exposure
  3. Inspect driver-load events, signature status and kernel integrity indicators
  4. Segment infected hosts and restrict unnecessary SMB access between workstations
  5. Use host firewalls, patch management and lateral-movement detections

Explanation

Correct Answer

A:

Shared artifacts and spread timing distinguish propagation from independent alerts; this evidence is scoped to whether a worm propagated laterally, not a generic system-health reading.

Incorrect Answers

B:

Removing payloads without closing the propagation route invites reinfection; when judging whether a worm propagated laterally, recovery is not factual verification; this is instead trusted restoration.

C:

A suspicious driver can interfere with EDR visibility and operating-system protections; the relevant condition for that step is whether low-level tampering explains sensor loss, which is not shown for whether a worm propagated laterally.

D:

Blocking lateral channels reduces the outbreak rate; the requirement concerns whether a worm propagated laterally, so immediate protection does not substantiate findings.

E:

Layered controls reduce workstation-to-workstation spread; the goal is evidence validation for whether a worm propagated laterally. Prevention is not incident verification.

Question 342

The affected workflow needs an integrity and access check following this event: A malicious binary uses a trusted signed application to load a sidecar library from a writable directory. What case-specific cleanup or recovery step establishes a trusted state?

  1. Replace altered components and fix writable library paths
  2. Control executable search paths and monitor unsigned modules in sensitive applications
  3. Rebuild from trusted media and verify firmware and driver integrity as warranted
  4. Quarantine the tampered application directory and block execution of the sidecar module

Explanation

Correct Answer

A:

Cleaning only the signed executable misses the malicious dependency; the resulting state needs verification against the original concern: whether DLL side-loading caused the activity.

Incorrect Answers

B:

Reducing side-loading opportunities makes abuse harder; for whether DLL side-loading caused the activity, future hardening is not current-state recovery; trusted restoration remains necessary.

C:

Deep compromise may leave artifacts beyond an ordinary file quarantine; that method could help with whether low-level tampering explains sensor loss; the trusted restoration decision here involves whether DLL side-loading caused the activity.

D:

Containing the loading path prevents repeated execution without blaming the signer alone; the goal is trusted restoration for whether DLL side-loading caused the activity. Temporary protection does not complete correction.

Question 343

An evidence-led review starts with the following report: A recovered workstation looks clean but EDR telemetry stops immediately after reintegration. What investigation should establish the disputed activity and its timeline?

  1. Make EDR-health checks a formal exit criterion for quarantine
  2. Compare management manifests and agent execution times with service recreation
  3. Keep the asset in restricted network access pending sensor restoration
  4. Check sensor heartbeat, policy status and event ingestion after network return

Explanation

Correct Answer

D:

An endpoint without functioning telemetry cannot be considered fully verified; it makes the determination of whether recovery validation includes monitoring health defensible and reviewable by the incident owner.

Incorrect Answers

A:

Monitoring continuity reduces silent reinfection; the goal is evidence validation for whether recovery validation includes monitoring health. Prevention is not incident verification.

B:

A compromised image or script can reinstall artifacts on clean endpoints; the other incident centers on whether deployment automation is reintroducing malware, not this evidence validation question about whether recovery validation includes monitoring health.

C:

Limited connectivity prevents a blind return to production; the case needs evidence validation addressing whether recovery validation includes monitoring health; immediate protection does not substantiate findings.

Question 344

A control owner is preparing preventive actions after observing: The incident team stores a decryption key only inside the infected server's local password vault. What tested hardening or process measure follows from the lessons learned?

  1. Test authorized access to recovery material with the server disconnected
  2. Maintain offline escrow and periodic key-recovery exercises
  3. Test weekend investigation scenarios and evidence retrieval deadlines
  4. Validate that a clean recovery environment can retrieve the protected key

Explanation

Correct Answer

B:

Resilience depends on accessible, well-governed cryptographic material; it makes the lesson about whether recovery keys remain accessible during host isolation part of normal operations.

Incorrect Answers

A:

A credential trapped on compromised infrastructure is not a usable emergency recovery asset; the goal is recurrence prevention for whether recovery keys remain accessible during host isolation. An investigation is not recurrence prevention.

C:

Preparedness should reflect realistic detection latency; the other incident centers on whether malware telemetry will survive delayed discovery, not this recurrence prevention question about whether recovery keys remain accessible during host isolation.

D:

Access testing catches dependency failure before an emergency; when judging whether recovery keys remain accessible during host isolation, case recovery is not future-risk control; this is instead trusted restoration.

Question 345

A post-incident audit examines the following failure mode: A hospital runs a malware drill but lacks clean images and emergency isolation plans for radiology workstations. What recurring check or restriction would best address the weakness?

  1. Review recovery images, clinical downtime procedures and network isolation dependencies
  2. Maintain manufacturer-approved recovery kits and clinical response exercises
  3. Validate approved images and vendor-assisted restoration in a test environment
  4. Maintain offline escrow and periodic key-recovery exercises

Explanation

Correct Answer

B:

Pretested procedures reduce operational risk during outbreaks; the assurance measure is designed around whether malware response preparation covers critical medical endpoints, rather than hiding the reported activity.

Incorrect Answers

A:

Medical device availability and supported reimaging constraints change the response options; an investigation is not recurrence prevention in the decision about whether malware response preparation covers critical medical endpoints.

C:

Supported recovery protects safety-critical integrations rather than improvising reinstallation; when judging whether malware response preparation covers critical medical endpoints, case recovery is not future-risk control; this is instead trusted restoration.

D:

Resilience depends on accessible, well-governed cryptographic material; this serves whether recovery keys remain accessible during host isolation, whereas the requested result is recurrence prevention involving whether malware response preparation covers critical medical endpoints.

Question 346

Before making any disruptive change, an investigator is handed these observations: A user downloads an executable from a spoofed update pop-up despite corporate patch management. Which source best supports the incident finding before responders modify the environment?

  1. Remove the installer and temporarily prevent execution of similar unapproved binaries
  2. Use application allowlisting and teach verified software-update paths
  3. Review download origin, browser events and installer signature information
  4. Compare local administrator credential reuse and lateral authentication logs

Explanation

Correct Answer

C:

An untrusted web installer differs from centrally managed software distribution; that evidence directly tests the concern about why user-driven fake updates bypassed approved channels, rather than relying on a single unverified indicator.

Incorrect Answers

A:

Execution control stops subsequent users from running the same payload; the requirement concerns why user-driven fake updates bypassed approved channels, so immediate protection does not substantiate findings.

B:

Policy and awareness reduce social engineering that impersonates updates; the goal is evidence validation for why user-driven fake updates bypassed approved channels. Prevention is not incident verification.

D:

Shared secrets can turn a single theft into broad access; it is meant to address why one infected device can lead to many endpoint logins, not evidence validation for why user-driven fake updates bypassed approved channels.

Question 347

A tabletop exercise is being updated using the following real-world failure: Memory scanning reveals injected code in a legitimate browser process although no malicious file exists on disk. Which improvement should be tracked through the next control-assurance cycle?

  1. Monitor remote thread creation and anomalous process-memory access
  2. Allowlist reviewed extensions and monitor new sensitive permissions
  3. Capture process memory, memory maps and injection-related events
  4. Investigate the injector and persistence mechanism before rebuilding the endpoint

Explanation

Correct Answer

A:

Behavioral telemetry can detect fileless injection; it closes a repeatable gap revealed by whether in-memory execution explains the alert without removing useful monitoring.

Incorrect Answers

B:

Governed extensions limit this endpoint attack surface; it is meant to address whether the extension update introduced malicious behavior, not recurrence prevention for whether in-memory execution explains the alert.

C:

Runtime evidence can reveal payloads invisible to file-only scanning; the requirement concerns whether in-memory execution explains the alert, so an investigation is not recurrence prevention.

D:

A clean browser executable does not exclude compromise in the process tree; the goal is recurrence prevention for whether in-memory execution explains the alert. Case recovery is not future-risk control.

Question 348

The responder must establish the timeline from this observation: A compromised Windows host shows legitimate system tools executing encoded commands from a remote management channel. Which analysis step best addresses the missing confirmation?

  1. Decode and correlate command-line telemetry with parent process and remote session source
  2. Revoke the unauthorized remote session and isolate its affected host
  3. Join authentication events with remote service installation and source-host timing
  4. Remove unauthorized remote-access persistence and reset impacted credentials
  5. Detect unusual command-line patterns and restrict remote administration exposure

Explanation

Correct Answer

A:

Signed utilities can still run attacker instructions that reveal intent; it connects the question of whether living-off-the-land execution masks malicious behavior to an observable record and a reproducible check.

Incorrect Answers

B:

Containing the access channel disrupts abuse even when binaries are legitimate; the goal is evidence validation for whether living-off-the-land execution masks malicious behavior. Immediate protection does not substantiate findings.

C:

The sequence ties credential use to code execution on another machine; this serves whether stolen credentials enabled lateral movement, whereas the requested result is evidence validation involving whether living-off-the-land execution masks malicious behavior.

D:

Cleanup should follow the actor's access mechanism, not simply delete OS utilities; the case needs evidence validation addressing whether living-off-the-land execution masks malicious behavior; recovery is not factual verification.

E:

Context-aware behavioral policies distinguish abuse from valid operations; when judging whether living-off-the-land execution masks malicious behavior, prevention is not incident verification; this is instead recurrence prevention.

Question 349

While full remediation remains pending, the commander receives this incident report: A server is restored from a snapshot taken after the initial compromise but before encryption. Which first protective measure directly limits the situation without assuming cleanup is finished?

  1. Do not reconnect the restored image until it is investigated in isolation
  2. Hold external transaction processing until integrity checks pass
  3. Compare snapshot creation times against the earliest credible intrusion indicator
  4. Record infection timelines and periodically test restore-point integrity
  5. Choose a verified clean restore point and apply missing security fixes

Explanation

Correct Answer

A:

A latent backdoor can reactivate on an apparently recovered server; the scope of this restriction follows whether a backup predates attacker persistence rather than indiscriminately changing unrelated assets.

Incorrect Answers

B:

Restricting writes prevents corrupt data from propagating; it is meant to address whether business service recovery is complete, not initial containment or preservation for whether a backup predates attacker persistence.

C:

Pre-encryption does not necessarily mean pre-compromise; investigation alone does not control current conditions in the decision about whether a backup predates attacker persistence.

D:

Backup selection improves when detection history is available; the case needs initial containment or preservation addressing whether a backup predates attacker persistence; prevention cannot replace immediate action.

E:

Trusted recovery requires both clean data and closed entry paths; when judging whether a backup predates attacker persistence, corrective follow-through follows initial protection; this is instead trusted restoration.

Question 350

The incident is resolved, but its root weakness still requires policy attention: Multiple staff reuse local administrator passwords across laptops infected by a credential stealer. What durable process or monitoring change would make a repeat less likely?

  1. Use application allowlisting and teach verified software-update paths
  2. Use unique managed local administrator passwords with least privilege
  3. Compare local administrator credential reuse and lateral authentication logs
  4. Rotate affected local passwords and verify no unauthorized sessions remain

Explanation

Correct Answer

B:

Non-reusable local secrets contain compromise impact; its effectiveness can be exercised against the warning conditions associated with why one infected device can lead to many endpoint logins.

Incorrect Answers

A:

Policy and awareness reduce social engineering that impersonates updates; the relevant condition for that step is why user-driven fake updates bypassed approved channels, which is not shown for why one infected device can lead to many endpoint logins.

C:

Shared secrets can turn a single theft into broad access; the goal is recurrence prevention for why one infected device can lead to many endpoint logins. An investigation is not recurrence prevention.

D:

Credential renewal removes the reusable access route; case recovery is not future-risk control in the decision about why one infected device can lead to many endpoint logins.

EC-Council Certified Incident Handler (212-89) Practice Tests