ECCouncil 212-89 (EC-Council Certified Incident Handler) Practice Test 108

Question 1070

A containment decision is required for this incident: A plant engineer proposes rebooting a suspected compromised controller during an active batch process. What action constrains the incident at the affected point of control?

  1. Schedule verified firmware or logic restoration during an authorized safe state
  2. Consult process state, fail-safe design and vendor maintenance guidance
  3. Follow site safety procedures and coordinate any network isolation with control engineers
  4. Use plant-approved protective actions before any controller power change

Explanation

Correct Answer

D:

Physical safety and continuity determine acceptable containment; this is a first-response safeguard for whether reboot is operationally safe, not a substitute for full root-cause analysis.

Incorrect Answers

A:

OT recovery should not bypass maintenance interlocks; corrective follow-through follows initial protection in the decision about whether reboot is operationally safe.

B:

A routine IT reboot can interrupt industrial equipment unpredictably; the case needs initial containment or preservation addressing whether reboot is operationally safe; investigation alone does not control current conditions.

C:

Unplanned shutdown can create greater physical danger; it is meant to address whether physical process safety is at risk, not initial containment or preservation for whether reboot is operationally safe.

Question 1071

While full remediation remains pending, the commander receives this incident report: An endpoint agent identifies an unusual persistence service but its parent installer is an approved device management package. Which first protective measure directly limits the situation without assuming cleanup is finished?

  1. Avoid destructive isolation while completing targeted validation
  2. Document the disposition and tune detection to the approved deployment identity
  3. Use a narrow temporary exception only after validating the updater
  4. Verify installer signatures, deployment manifest and service command path

Explanation

Correct Answer

A:

Proportionate response minimizes disruption from false positives; the scope of this restriction follows whether the service change is authorized rather than indiscriminately changing unrelated assets.

Incorrect Answers

B:

Accurate closure retains visibility for future malicious variants; when judging whether the service change is authorized, corrective follow-through follows initial protection; this is instead trusted restoration.

C:

Broad antivirus disablement would create unnecessary exposure; that method could help with whether the alert is a benign software change; the initial containment or preservation decision here involves whether the service change is authorized.

D:

A suspicious-looking service can be legitimate if trusted release evidence corroborates it; the requirement concerns whether the service change is authorized, so investigation alone does not control current conditions.

Question 1072

The recovery owner is reviewing the underlying failure in this report: A privileged user installs an unsigned kernel extension and endpoint monitoring stops reporting immediately afterward. What action most directly repairs the affected access, evidence or system state?

  1. Remove the launched payload, verify the support agent and restrict permitted child execution
  2. Apply independent network quarantine if host-based controls are unreliable
  3. Rebuild the endpoint, re-enroll EDR and verify kernel-extension controls and telemetry
  4. Restrict driver installation and monitor kernel integrity changes

Explanation

Correct Answer

C:

Restoring agent trust and tested kernel controls validates monitoring after the unauthorized extension is removed; the owner can validate the correction against the evidence bearing on whether kernel-level changes caused endpoint sensor loss.

Incorrect Answers

A:

Trusted agent state and restricted child processes prevent the sanctioned tool from silently relaunching the same payload; it is meant to address whether a remote-management tool was abused, not trusted restoration for whether kernel-level changes caused endpoint sensor loss.

B:

An untrusted endpoint agent may be unable to enforce isolation; when judging whether kernel-level changes caused endpoint sensor loss, temporary protection does not complete correction; this is instead initial containment or preservation.

D:

Lower privilege and visibility reduce tampering opportunities; the requirement concerns whether kernel-level changes caused endpoint sensor loss, so future hardening is not current-state recovery.

Question 1073

During lessons learned, the security owner reviews this completed incident: An industrial controller vendor prohibits untested security agents, but the SOC intends to install a standard endpoint scanner during an incident. Which repeatable safeguard best prevents this failure mode in the future?

  1. Include event-retention performance tests in endpoint baselines
  2. Confirm vendor support, process dependencies and authorized maintenance procedures
  3. Collect evidence through vendor-approved interfaces and validate control functionality
  4. Maintain OT-specific tool approvals and isolated test environments

Explanation

Correct Answer

D:

Preparation avoids dangerous production experiments; it closes a repeatable gap revealed by whether the equipment vendor approves the proposed scanner for this controller without removing useful monitoring.

Incorrect Answers

A:

Capacity planning improves forensic readiness; the activity targets whether security telemetry capacity is adequate; recurrence prevention here concerns whether the equipment vendor approves the proposed scanner for this controller.

B:

Unvalidated software can disrupt controllers and physical operations; when judging whether the equipment vendor approves the proposed scanner for this controller, an investigation is not recurrence prevention; this is instead evidence validation.

C:

Supported methods preserve reliability while investigating; for whether the equipment vendor approves the proposed scanner for this controller, case recovery is not future-risk control; recurrence prevention remains necessary.

Question 1074

Forensic review begins with this reported event: An OT network sees new programming commands to a PLC from a workstation that normally only displays status. Which evidence-based task answers the primary uncertainty?

  1. Restrict engineering protocol writes from the suspect station under OT change control
  2. Consult process state, fail-safe design and vendor maintenance guidance
  3. Allowlist engineering workstations and monitor PLC program changes
  4. Compare PLC programming audit, source identity and authorized engineering schedule

Explanation

Correct Answer

D:

Command type and workstation role help identify unauthorized modification; it connects the question of whether a nonengineering station initiated controller changes to an observable record and a reproducible check.

Incorrect Answers

A:

Write-path containment protects controller logic while preserving monitoring; for whether a nonengineering station initiated controller changes, immediate protection does not substantiate findings; evidence validation remains necessary.

B:

A routine IT reboot can interrupt industrial equipment unpredictably; the activity targets whether reboot is operationally safe; evidence validation here concerns whether a nonengineering station initiated controller changes.

C:

Separated roles reduce unauthorized logic updates; the goal is evidence validation for whether a nonengineering station initiated controller changes. Prevention is not incident verification.

Question 1075

The owner must verify the return to a trusted state for the following: Hundreds of identical smart meters share the same embedded administrative secret. Choose THREE actions that separately (1) verify the reported facts, (2) protect against immediate harm and (3) correct the underlying failure before service returns. (Choose THREE.)

  1. Require signed firmware and approved update management for IoT assets
  2. Inventory firmware identities and validate the shared credential design
  3. Rotate credentials through supported provisioning or replace unfixable devices
  4. Enforce unique device credentials and isolated management networks
  5. Restrict administrative network reachability while planning credential changes
  6. Require per-device credentials and secure provisioning contracts

Explanation

Correct Answers

B:

One leaked secret could enable access to many devices; within the combined response for whether common embedded credentials amplify compromise, this supplies evidence validation: it makes the determination of whether common embedded credentials amplify compromise defensible and reviewable by the incident owner.

C:

Recovery needs unique trust per asset where possible; within the combined response for whether common embedded credentials amplify compromise, this supplies trusted restoration: the recovery decision is tied to whether common embedded credentials amplify compromise, not merely to reduced alert volume.

E:

Segment-level containment reduces fleet-wide abuse; within the combined response for whether common embedded credentials amplify compromise, this supplies initial containment or preservation: this is a first-response safeguard for whether common embedded credentials amplify compromise, not a substitute for full root-cause analysis.

Incorrect Answers

A:

Firmware provenance reduces supply-chain and unauthorized changes; the activity targets whether firmware integrity or destination was altered; trusted restoration here concerns whether common embedded credentials amplify compromise.

D:

IoT devices should not depend on factory defaults; this serves whether weak device identity enabled unauthorized access, whereas the requested result is trusted restoration involving whether common embedded credentials amplify compromise.

F:

Fleet identity design prevents single-secret compromise; the goal is trusted restoration for whether common embedded credentials amplify compromise. Future hardening is not current-state recovery.

Question 1076

The incident is resolved, but its root weakness still requires policy attention: A smart thermostat gateway sends traffic to an unknown cloud endpoint after an unapproved firmware update. What durable process or monitoring change would make a repeat less likely?

  1. Compare firmware version and signature with vendor release records and flow logs
  2. Require signed firmware and approved update management for IoT assets
  3. Segment device management and patch vulnerable network services
  4. Require per-device credentials and secure provisioning contracts
  5. Restrict the gateway's outbound paths without interrupting essential building control
  6. Restore vendor-verified firmware and validate operating parameters

Explanation

Correct Answer

B:

Firmware provenance reduces supply-chain and unauthorized changes; a periodic review of this safeguard can track the risk described by whether firmware integrity or destination was altered.

Incorrect Answers

A:

An unexpected firmware build can change device behavior and external communication; an investigation is not recurrence prevention in the decision about whether firmware integrity or destination was altered.

C:

Reduced reachability limits exploitation; the relevant condition for that step is whether malicious management requests cause availability loss, which is not shown for whether firmware integrity or destination was altered.

D:

Fleet identity design prevents single-secret compromise; the relevant condition for that step is whether common embedded credentials amplify compromise, which is not shown for whether firmware integrity or destination was altered.

E:

Network containment protects safety and availability; the requirement concerns whether firmware integrity or destination was altered, so one-time protection is not durable prevention.

F:

Recovery should use supported update mechanisms; the goal is recurrence prevention for whether firmware integrity or destination was altered. Case recovery is not future-risk control.

Question 1077

The immediate risk must be managed. The response record describes: An iPhone user accepts an untrusted mobile configuration profile that adds a suspicious VPN and root certificate. Which intervention is most effective before full eradication or restoration?

  1. Remove the unauthorized profile under managed procedures and revoke exposed sessions
  2. Disable the suspicious app and restrict sensitive mobile sessions
  3. Re-establish trusted configuration and inspect for possible intercepted accounts
  4. Inspect installed profiles, certificate trust and VPN routing configuration
  5. Use managed configuration profile controls and certificate governance

Explanation

Correct Answer

A:

Containment stops routing through the suspect configuration; the protective decision should be recorded and its effect tested against whether configuration profiles redirect or intercept traffic.

Incorrect Answers

B:

Containment prevents continued observation of protected notifications; the relevant condition for that step is whether abuse of accessibility services is occurring, which is not shown for whether configuration profiles redirect or intercept traffic.

C:

Recovery should treat redirected sensitive traffic as a possible disclosure; for whether configuration profiles redirect or intercept traffic, corrective follow-through follows initial protection; initial containment or preservation remains necessary.

D:

Unapproved profiles can alter both traffic paths and trusted certificate authorities; the requirement concerns whether configuration profiles redirect or intercept traffic, so investigation alone does not control current conditions.

E:

Approved enrollment prevents silent network trust changes; the goal is initial containment or preservation for whether configuration profiles redirect or intercept traffic. Prevention cannot replace immediate action.

Question 1078

The recurrence-prevention decision is based on this report: An EDR alert shows a suspicious executable launched by a legitimate remote administration utility. What measure strengthens readiness against the observed event?

  1. Remove the launched payload, verify the support agent and restrict permitted child execution
  2. Restrict remote assistance tools and record privileged sessions
  3. Revoke unauthorized remote sessions and isolate the affected host
  4. Use behavior-based EDR detections with process ancestry
  5. Correlate remote session identity, process tree and execution time

Explanation

Correct Answer

B:

Approved support tooling improves auditability; the ongoing control is targeted at whether a remote-management tool was abused, rather than a one-time emergency fix.

Incorrect Answers

A:

Trusted agent state and restricted child processes prevent the sanctioned tool from silently relaunching the same payload; the requirement concerns whether a remote-management tool was abused, so case recovery is not future-risk control.

C:

Access-path containment is essential beyond blocking one file; one-time protection is not durable prevention in the decision about whether a remote-management tool was abused.

D:

Context improves endpoint triage precision; it is meant to address what corroborates suspicious endpoint execution, not recurrence prevention for whether a remote-management tool was abused.

E:

A legitimate support binary can still start attacker-controlled commands; when judging whether a remote-management tool was abused, an investigation is not recurrence prevention; this is instead evidence validation.

Question 1079

To prevent the next similar event, analysts review this case: A remote maintenance vendor connects to an industrial gateway from an unapproved device with a previously issued credential. Which preventive change targets the exact pathway that failed?

  1. Use supervised time-bound vendor access with device trust checks
  2. Rotate vendor credentials and inspect changes made during the session
  3. Terminate the unauthorized vendor session through site procedure
  4. Build incident runbooks around process hazards and safe shutdown windows
  5. Review vendor session recording, gateway logs and maintenance authorization
  6. Use asset inventory, virtual patching and controlled maintenance windows

Explanation

Correct Answer

A:

Controlled maintenance reduces latent remote entry points; the assurance measure is designed around whether vendor remote access was misused, rather than hiding the reported activity.

Incorrect Answers

B:

Recovery includes process configuration and identity review; when judging whether vendor remote access was misused, case recovery is not future-risk control; this is instead trusted restoration.

C:

Remote access containment reduces the risk of controller manipulation; for whether vendor remote access was misused, one-time protection is not durable prevention; recurrence prevention remains necessary.

D:

Preparation prevents unsafe response actions; the relevant condition for that step is whether reboot is operationally safe, which is not shown for whether vendor remote access was misused.

E:

A valid credential does not prove the connection was approved; the goal is recurrence prevention for whether vendor remote access was misused. An investigation is not recurrence prevention.

F:

Compensating controls reduce risk until supported updates are possible; that method could help with whether compensating controls can reduce endpoint risk; the recurrence prevention decision here involves whether vendor remote access was misused.

Question 1080

The team needs temporary protection and must retain evidence. The observed event is: A warehouse IoT gateway is repeatedly rebooting after malformed management traffic from an unknown segment. What narrowly scoped action would best control the immediate risk?

  1. Correlate gateway crash logs, source flows and management parser errors
  2. Restrict the gateway's outbound paths without interrupting essential building control
  3. Update supported firmware and validate stable gateway communication
  4. Filter unauthorized management traffic at the segment boundary

Explanation

Correct Answer

D:

Containment avoids repeatedly rebooting the gateway as the only response; the immediate response addresses whether malicious management requests cause availability loss while the team preserves relevant case records.

Incorrect Answers

A:

Timing and input patterns can link traffic to service instability; investigation alone does not control current conditions in the decision about whether malicious management requests cause availability loss.

B:

Network containment protects safety and availability; the activity targets whether firmware integrity or destination was altered; initial containment or preservation here concerns whether malicious management requests cause availability loss.

C:

Recovery should remove the exposed fault condition; when judging whether malicious management requests cause availability loss, corrective follow-through follows initial protection; this is instead trusted restoration.

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