ECCouncil 212-89 (EC-Council Certified Incident Handler) Practice Test 34

Question 330

A case advances from immediate protection to root-cause correction after: A rebuilt endpoint is immediately rejoined to an identity domain where its machine credentials are suspected stolen. Which verified recovery step is appropriate after initial containment?

  1. Tie reimaging playbooks to credential and certificate reissuance checks
  2. Choose a verified clean restore point and apply missing security fixes
  3. Rotate machine credentials and validate domain enrollment under approved procedure
  4. Keep the rebuilt device out of privileged network segments until identity trust is reset

Explanation

Correct Answer

C:

Trust restoration must address the identity plane as well as local files; the recovery decision is tied to whether endpoint trust is safe to restore, not merely to reduced alert volume.

Incorrect Answers

A:

Integrated recovery prevents old credentials from surviving the rebuild; for whether endpoint trust is safe to restore, future hardening is not current-state recovery; trusted restoration remains necessary.

B:

Trusted recovery requires both clean data and closed entry paths; the relevant condition for that step is whether a backup predates attacker persistence, which is not shown for whether endpoint trust is safe to restore.

D:

Network gating limits re-entry while identity risk remains; temporary protection does not complete correction in the decision about whether endpoint trust is safe to restore.

Question 331

The initial scene or threat protection decision concerns the following: Ransomware starts encrypting a file share while snapshots remain healthy and accessible. How should responders limit the damage while retaining the investigation trail?

  1. Rebuild affected hosts and restore files from verified preinfection backups
  2. Correlate file rename bursts with the initiating process and SMB session
  3. Disconnect the infected client and revoke its write access to the share
  4. Terminate the offending execution and secure isolated recovery repositories

Explanation

Correct Answer

C:

Stopping the active writer limits damage while preserving clean snapshots; this reduces current exposure associated with which containment step stops ongoing encryption and permits later corrective work.

Incorrect Answers

A:

A clean source is required before trusted data restoration; corrective follow-through follows initial protection in the decision about which containment step stops ongoing encryption.

B:

Identifying the source host helps stop active write activity; the case needs initial containment or preservation addressing which containment step stops ongoing encryption; investigation alone does not control current conditions.

D:

Protecting remaining copies is crucial before broader restoration; that method could help with whether backup-suppression activity is part of the attack; the initial containment or preservation decision here involves which containment step stops ongoing encryption.

Question 332

Forensic review begins with this reported event: A user reports a browser extension silently reading sensitive form fields after a recent update. Which evidence-based task answers the primary uncertainty?

  1. Allowlist reviewed extensions and monitor new sensitive permissions
  2. Inspect extension IDs, permission changes, update provenance and browser events
  3. Disable the suspicious extension through managed browser policy
  4. Inspect scheduled-task definitions, creation events and task action paths

Explanation

Correct Answer

B:

New host permissions and update history can explain unexpected data access; it connects the question of whether the extension update introduced malicious behavior to an observable record and a reproducible check.

Incorrect Answers

A:

Governed extensions limit this endpoint attack surface; prevention is not incident verification in the decision about whether the extension update introduced malicious behavior.

C:

Central disablement stops its access across affected browsers; when judging whether the extension update introduced malicious behavior, immediate protection does not substantiate findings; this is instead initial containment or preservation.

D:

These records identify the launch target and the identity establishing persistence; that method could help with which persistence artifact causes recurring execution; the evidence validation decision here involves whether the extension update introduced malicious behavior.

Question 333

A long-term control assessment uses this recent event: An endpoint's network isolation is reversed automatically by an unapproved management script. Which change provides measurable prevention rather than an emergency workaround?

  1. Correct automation ownership and verify containment survives a policy cycle
  2. Compare firewall and EDR isolation changes against automation run histories
  3. Use controlled media transfer stations and removable-device policies
  4. Test incident overrides against routine endpoint management jobs

Explanation

Correct Answer

D:

Runbook integration prevents accidental de-isolation; this turns the weakness behind why malware containment does not persist into a measurable prevention requirement.

Incorrect Answers

A:

Durable remediation requires fixing the conflicting control; when judging why malware containment does not persist, case recovery is not future-risk control; this is instead trusted restoration.

B:

Control-plane conflict can reopen communication after responders block it; for why malware containment does not persist, an investigation is not recurrence prevention; recurrence prevention remains necessary.

C:

Air-gapped operations still require ingress controls; that method could help with whether removable media caused repeated reinfections; the recurrence prevention decision here involves why malware containment does not persist.

Question 334

To distinguish suspicion from confirmed impact, the SOC examines this case: A server repeatedly creates an unfamiliar scheduled task that launches a remote script at midnight. Which review would give the incident owner the strongest case-specific evidence?

  1. Inspect scheduled-task definitions, creation events and task action paths
  2. Disable the suspect task and block its remote script endpoint
  3. Correlate Office process ancestry with PowerShell command-line and script block logs
  4. Alert on unusual scheduled-task registration by non-administrative workflows

Explanation

Correct Answer

A:

These records identify the launch target and the identity establishing persistence; that evidence directly tests the concern about which persistence artifact causes recurring execution, rather than relying on a single unverified indicator.

Incorrect Answers

B:

Stopping both trigger and delivery path limits execution; the case needs evidence validation addressing which persistence artifact causes recurring execution; immediate protection does not substantiate findings.

C:

Parent-child and script evidence connect the document action to execution; the activity targets whether a document triggered script-based malware; evidence validation here concerns which persistence artifact causes recurring execution.

D:

Monitoring persistence changes provides earlier detection; for which persistence artifact causes recurring execution, prevention is not incident verification; evidence validation remains necessary.

Question 335

A tabletop exercise is being updated using the following real-world failure: A malicious browser download installs a local proxy that intercepts user sessions. Which improvement should be tracked through the next control-assurance cycle?

  1. Compare system proxy settings, installed certificates and process listeners
  2. Remove malicious proxy components and distrust injected certificates
  3. Use managed identities where possible and monitor anomalous service-account use
  4. Limit local proxy changes and monitor certificate trust-store modifications

Explanation

Correct Answer

D:

Configuration integrity blocks a less visible malware persistence route; it closes a repeatable gap revealed by whether a configuration-based interception remains active without removing useful monitoring.

Incorrect Answers

A:

Local proxy changes can redirect traffic even after the original installer exits; when judging whether a configuration-based interception remains active, an investigation is not recurrence prevention; this is instead evidence validation.

B:

Recovering safe transport requires reversing configuration and trust changes; for whether a configuration-based interception remains active, case recovery is not future-risk control; recurrence prevention remains necessary.

C:

Reducing reusable secrets lowers credential replay risk; this serves which access path remains dangerous, whereas the requested result is recurrence prevention involving whether a configuration-based interception remains active.

Question 336

A containment decision is required for this incident: A threat actor modifies an application's startup service to download a payload after every reboot. What action constrains the incident at the affected point of control?

  1. Disable the malicious startup entry and block its known distribution endpoint
  2. Review service registry or unit definitions and outbound fetch records
  3. Disable the unauthorized proxy and isolate the endpoint for credential assessment
  4. Restore service configuration from trusted baselines and inspect related startup entries

Explanation

Correct Answer

A:

Both trigger and destination must be addressed to interrupt re-execution; it protects the affected workflow while investigators continue resolving whether startup configuration will reinfect the system.

Incorrect Answers

B:

A startup downloader can replenish malware removed from the filesystem; the requirement concerns whether startup configuration will reinfect the system, so investigation alone does not control current conditions.

C:

Stopping interception prevents additional session capture; the activity targets whether a configuration-based interception remains active; initial containment or preservation here concerns whether startup configuration will reinfect the system.

D:

Completeness matters because multiple persistence mechanisms can coexist; corrective follow-through follows initial protection in the decision about whether startup configuration will reinfect the system.

Question 337

The owner must verify the return to a trusted state for the following: A compromised Linux server runs a malicious cron job as root while the executing file has changed hashes repeatedly. What corrective work is needed before routine operations resume?

  1. Disable the offending cron entry and prevent outbound payload retrieval
  2. Rotate affected secrets and restore least-privilege account permissions
  3. Audit privileged cron modifications and restrict write access to job directories
  4. Rebuild the trusted scheduled-job baseline and check root access paths

Explanation

Correct Answer

D:

Cleaning mutable files without fixing scheduler or privileges is insufficient; technical closure should demonstrate that the control gap behind why signature-only cleanup fails is actually corrected.

Incorrect Answers

A:

Blocking the trigger interrupts periodic reinfection; the case needs trusted restoration addressing why signature-only cleanup fails; temporary protection does not complete correction.

B:

Changing the credential closes the persistent unauthorized access path; it is meant to address which access path remains dangerous, not trusted restoration for why signature-only cleanup fails.

C:

Change monitoring targets persistence rather than static hashes; for why signature-only cleanup fails, future hardening is not current-state recovery; trusted restoration remains necessary.

Question 338

The affected workflow needs an integrity and access check following this event: The team deletes ransomware notes but does not test recovered database transactions. What case-specific cleanup or recovery step establishes a trusted state?

  1. Rotate machine credentials and validate domain enrollment under approved procedure
  2. Restore the database from a verified clean recovery point and reconcile business transactions
  3. Include functional restoration tests in ransomware recovery exercises
  4. Hold external transaction processing until integrity checks pass

Explanation

Correct Answer

B:

Transaction-level reconciliation and a trustworthy recovery point address integrity failures beyond ransomware-note removal; the owner can validate the correction against the evidence bearing on whether business service recovery is complete.

Incorrect Answers

A:

Trust restoration must address the identity plane as well as local files; this serves whether endpoint trust is safe to restore, whereas the requested result is trusted restoration involving whether business service recovery is complete.

C:

Service success requires more than malware absence; the requirement concerns whether business service recovery is complete, so future hardening is not current-state recovery.

D:

Restricting writes prevents corrupt data from propagating; the goal is trusted restoration for whether business service recovery is complete. Temporary protection does not complete correction.

Question 339

A case advances from immediate protection to root-cause correction after: A workstation repeatedly contacts algorithmically generated domains after an unexplained process starts at login. Which verified recovery step is appropriate after initial containment?

  1. Remove the associated persistence and examine credentials used by the process
  2. Detect unusual NXDOMAIN bursts and rare-domain patterns
  3. Clean or rebuild infected systems and remediate the exploited SMB exposure
  4. Isolate the host's outbound traffic and preserve relevant DNS telemetry
  5. Correlate DNS query sequences with process creation and network connections

Explanation

Correct Answer

A:

Eradication must address how the unwanted process restarts or maintains access; it is the corrective action needed for whether the host exhibits domain-generation command traffic after the immediate hazard is controlled.

Incorrect Answers

B:

Behavioral rules can catch domain rotation without static block lists; the requirement concerns whether the host exhibits domain-generation command traffic, so future hardening is not current-state recovery.

C:

Removing payloads without closing the propagation route invites reinfection; that method could help with whether a worm propagated laterally; the trusted restoration decision here involves whether the host exhibits domain-generation command traffic.

D:

The block curbs command retrieval while retaining host evidence; temporary protection does not complete correction in the decision about whether the host exhibits domain-generation command traffic.

E:

High-volume pseudo-random lookups tied to one process support a DGA hypothesis; the case needs trusted restoration addressing whether the host exhibits domain-generation command traffic; verification is not the corrective step.

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.

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