ECCouncil 212-89 (EC-Council Certified Incident Handler) Practice Test 30

Question 290

An improvement plan must address recurrence after this case: A domain controller records privileged authentication from a compromised workstation followed by remote service creation. What should the owner add to the normal control review to reduce recurrence?

  1. Detect unusual command-line patterns and restrict remote administration exposure
  2. Join authentication events with remote service installation and source-host timing
  3. Use tiered administration and remote-service creation monitoring
  4. Rotate affected credentials and remove unauthorized services after forensic collection

Explanation

Correct Answer

C:

Separation of privileged use limits credential theft blast radius; it makes the lesson about whether stolen credentials enabled lateral movement part of normal operations.

Incorrect Answers

A:

Context-aware behavioral policies distinguish abuse from valid operations; the other incident centers on whether living-off-the-land execution masks malicious behavior, not this recurrence prevention question about whether stolen credentials enabled lateral movement.

B:

The sequence ties credential use to code execution on another machine; the requirement concerns whether stolen credentials enabled lateral movement, so an investigation is not recurrence prevention.

D:

Restoration requires removal of both access and persistence; case recovery is not future-risk control in the decision about whether stolen credentials enabled lateral movement.

Question 291

While full remediation remains pending, the commander receives this incident report: The incident team stores a decryption key only inside the infected server's local password vault. Which first protective measure directly limits the situation without assuming cleanup is finished?

  1. Test authorized access to recovery material with the server disconnected
  2. Coordinate isolation decisions with clinical safety owners and segment affected devices
  3. Validate that a clean recovery environment can retrieve the protected key
  4. Secure an authorized independent copy of the recovery key under dual control

Explanation

Correct Answer

D:

Off-host custody permits restoration without relying on the infected machine; the action limits the impact connected to whether recovery keys remain accessible during host isolation without assuming the underlying flaw is already gone.

Incorrect Answers

A:

A credential trapped on compromised infrastructure is not a usable emergency recovery asset; the requirement concerns whether recovery keys remain accessible during host isolation, so investigation alone does not control current conditions.

B:

Patient-care continuity must be considered alongside attack containment; this serves whether malware response preparation covers critical medical endpoints, whereas the requested result is initial containment or preservation involving whether recovery keys remain accessible during host isolation.

C:

Access testing catches dependency failure before an emergency; corrective follow-through follows initial protection in the decision about whether recovery keys remain accessible during host isolation.

Question 292

A security analyst is asked to validate the following reported behavior: A finance workstation still allows unsigned macros from internet-downloaded spreadsheets. Which check can confirm the relevant facts before a disruptive action?

  1. Disable unauthorized macro execution and quarantine the offending attachment
  2. Block internet-origin macros and use signed workflows for approved automation
  3. Review download origin, browser events and installer signature information
  4. Inspect Office macro trust state, file origin markings and process ancestry

Explanation

Correct Answer

D:

Internet-origin macros provide an avoidable initial execution surface; that evidence directly tests the concern about whether document execution controls are effective, rather than relying on a single unverified indicator.

Incorrect Answers

A:

Control prevents additional users from invoking the same script; when judging whether document execution controls are effective, immediate protection does not substantiate findings; this is instead initial containment or preservation.

B:

Trusted authoring controls reduce malware entry opportunities; for whether document execution controls are effective, prevention is not incident verification; evidence validation remains necessary.

C:

An untrusted web installer differs from centrally managed software distribution; the relevant condition for that step is why user-driven fake updates bypassed approved channels, which is not shown for whether document execution controls are effective.

Question 293

The incident owner requests a defensible factual determination after hearing: A compromised Linux server runs a malicious cron job as root while the executing file has changed hashes repeatedly. What fact-checking activity tests the observed failure most directly?

  1. Audit privileged cron modifications and restrict write access to job directories
  2. Review cron entries, file histories and spawned command lines
  3. Review service registry or unit definitions and outbound fetch records
  4. Disable the offending cron entry and prevent outbound payload retrieval

Explanation

Correct Answer

B:

The scheduled execution pattern remains stable even when payload bytes rotate; it makes the determination of why signature-only cleanup fails defensible and reviewable by the incident owner.

Incorrect Answers

A:

Change monitoring targets persistence rather than static hashes; for why signature-only cleanup fails, prevention is not incident verification; evidence validation remains necessary.

C:

A startup downloader can replenish malware removed from the filesystem; the relevant condition for that step is whether startup configuration will reinfect the system, which is not shown for why signature-only cleanup fails.

D:

Blocking the trigger interrupts periodic reinfection; immediate protection does not substantiate findings in the decision about why signature-only cleanup fails.

Question 294

Active first response is underway for the following condition: A malicious browser download installs a local proxy that intercepts user sessions. What is the most appropriate short-term restriction or first-response decision?

  1. Disable the malicious startup entry and block its known distribution endpoint
  2. Remove malicious proxy components and distrust injected certificates
  3. Disable the unauthorized proxy and isolate the endpoint for credential assessment
  4. Compare system proxy settings, installed certificates and process listeners

Explanation

Correct Answer

C:

Stopping interception prevents additional session capture; this is a first-response safeguard for whether a configuration-based interception remains active, not a substitute for full root-cause analysis.

Incorrect Answers

A:

Both trigger and destination must be addressed to interrupt re-execution; the activity targets whether startup configuration will reinfect the system; initial containment or preservation here concerns whether a configuration-based interception remains active.

B:

Recovering safe transport requires reversing configuration and trust changes; when judging whether a configuration-based interception remains active, corrective follow-through follows initial protection; this is instead trusted restoration.

D:

Local proxy changes can redirect traffic even after the original installer exits; the requirement concerns whether a configuration-based interception remains active, so investigation alone does not control current conditions.

Question 295

A long-term control assessment uses this recent event: A ransomware affiliate disables volume shadow copies just before encrypting departmental data. Which change provides measurable prevention rather than an emergency workaround?

  1. Alert on unauthorized backup deletion and maintain immutable offline copies
  2. Rebuild affected systems and recover from protected backups verified clean
  3. Use least-privilege share access and immutable backup protection
  4. Correlate backup-management commands with file-encryption onset

Explanation

Correct Answer

A:

Protection outside attacker control improves recoverability; the assurance measure is designed around whether backup-suppression activity is part of the attack, rather than hiding the reported activity.

Incorrect Answers

B:

Local shadow copies may be unavailable or untrustworthy; for whether backup-suppression activity is part of the attack, case recovery is not future-risk control; recurrence prevention remains necessary.

C:

Reduced write permissions and protected copies limit future losses; the other incident centers on which containment step stops ongoing encryption, not this recurrence prevention question about whether backup-suppression activity is part of the attack.

D:

Destructive backup commands help establish intent and attack chronology; the goal is recurrence prevention for whether backup-suppression activity is part of the attack. An investigation is not recurrence prevention.

Question 296

The team needs temporary protection and must retain evidence. The observed event is: Multiple staff reuse local administrator passwords across laptops infected by a credential stealer. What narrowly scoped action would best control the immediate risk?

  1. Use unique managed local administrator passwords with least privilege
  2. Narrow or revoke unsafe exclusions after testing legitimate workloads
  3. Rotate affected local passwords and verify no unauthorized sessions remain
  4. Restrict exposed administrative access and isolate endpoints using the same credentials
  5. Compare local administrator credential reuse and lateral authentication logs

Explanation

Correct Answer

D:

The attacker should not retain easy access to parallel machines; it restricts the path implicated in why one infected device can lead to many endpoint logins; later eradication and restoration remain separate decisions.

Incorrect Answers

A:

Non-reusable local secrets contain compromise impact; for why one infected device can lead to many endpoint logins, prevention cannot replace immediate action; initial containment or preservation remains necessary.

B:

Restoring visibility reduces malware concealment without needlessly blocking builds; the relevant condition for that step is whether broad exclusions hide malware execution, which is not shown for why one infected device can lead to many endpoint logins.

C:

Credential renewal removes the reusable access route; the goal is initial containment or preservation for why one infected device can lead to many endpoint logins. Corrective follow-through follows initial protection.

E:

Shared secrets can turn a single theft into broad access; the case needs initial containment or preservation addressing why one infected device can lead to many endpoint logins; investigation alone does not control current conditions.

Question 297

Cleanup is not considered complete. The case record describes: A compromised Windows host shows legitimate system tools executing encoded commands from a remote management channel. Which remediation task is necessary rather than merely suppressing the visible symptom?

  1. Remove the associated persistence and examine credentials used by the process
  2. Detect unusual command-line patterns and restrict remote administration exposure
  3. Remove unauthorized remote-access persistence and reset impacted credentials
  4. Revoke the unauthorized remote session and isolate its affected host

Explanation

Correct Answer

C:

Cleanup should follow the actor's access mechanism, not simply delete OS utilities; the affected workflow should not be considered trusted until the issue of whether living-off-the-land execution masks malicious behavior is resolved.

Incorrect Answers

A:

Eradication must address how the unwanted process restarts or maintains access; the activity targets whether the host exhibits domain-generation command traffic; trusted restoration here concerns whether living-off-the-land execution masks malicious behavior.

B:

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

D:

Containing the access channel disrupts abuse even when binaries are legitimate; the requirement concerns whether living-off-the-land execution masks malicious behavior, so temporary protection does not complete correction.

Question 298

A case advances from immediate protection to root-cause correction after: Memory scanning reveals injected code in a legitimate browser process although no malicious file exists on disk. What remaining assessment or remediation is justified after the immediate response?

  1. Remove the imposter and investigate how it was launched
  2. Monitor remote thread creation and anomalous process-memory access
  3. Isolate the host and suspend suspicious injected activity under forensic procedures
  4. Investigate the injector and persistence mechanism before rebuilding the endpoint

Explanation

Correct Answer

D:

A clean browser executable does not exclude compromise in the process tree; response staff can use these findings about whether in-memory execution explains the alert to decide what eradication and recovery actually require.

Incorrect Answers

A:

Startup links or scripts can recreate the fraudulent process; the relevant condition for that step is whether a process name is being spoofed, which is not shown for whether in-memory execution explains the alert.

B:

Behavioral telemetry can detect fileless injection; the requirement concerns whether in-memory execution explains the alert, so future hardening is not current-state recovery.

C:

The active process may still communicate even with a clean disk scan; the goal is post-containment assessment for whether in-memory execution explains the alert. Temporary protection does not complete correction.

Question 299

A control owner is preparing preventive actions after observing: A compromised Windows host shows legitimate system tools executing encoded commands from a remote management channel. What tested hardening or process measure follows from the lessons learned?

  1. Detect unusual command-line patterns and restrict remote administration exposure
  2. Decode and correlate command-line telemetry with parent process and remote session source
  3. Remove unauthorized remote-access persistence and reset impacted credentials
  4. Use tiered administration and remote-service creation monitoring

Explanation

Correct Answer

A:

Context-aware behavioral policies distinguish abuse from valid operations; a periodic review of this safeguard can track the risk described by whether living-off-the-land execution masks malicious behavior.

Incorrect Answers

B:

Signed utilities can still run attacker instructions that reveal intent; an investigation is not recurrence prevention in the decision about whether living-off-the-land execution masks malicious behavior.

C:

Cleanup should follow the actor's access mechanism, not simply delete OS utilities; the case needs recurrence prevention addressing whether living-off-the-land execution masks malicious behavior; case recovery is not future-risk control.

D:

Separation of privileged use limits credential theft blast radius; the activity targets whether stolen credentials enabled lateral movement; recurrence prevention here concerns whether living-off-the-land execution masks malicious behavior.

Question 300

To prevent the next similar event, analysts review this case: A server repeatedly creates an unfamiliar scheduled task that launches a remote script at midnight. Which preventive change targets the exact pathway that failed?

  1. Harden Office child-process restrictions and PowerShell telemetry
  2. Remove the malicious task and validate other startup mechanisms
  3. Alert on unusual scheduled-task registration by non-administrative workflows
  4. Inspect scheduled-task definitions, creation events and task action paths

Explanation

Correct Answer

C:

Monitoring persistence changes provides earlier detection; the control owner can test whether this reduces repeat conditions affecting which persistence artifact causes recurring execution.

Incorrect Answers

A:

Application controls reduce this common execution chain; that method could help with whether a document triggered script-based malware; the recurrence prevention decision here involves which persistence artifact causes recurring execution.

B:

Cleanup should ensure the attacker did not create a second trigger; the goal is recurrence prevention for which persistence artifact causes recurring execution. Case recovery is not future-risk control.

D:

These records identify the launch target and the identity establishing persistence; the case needs recurrence prevention addressing which persistence artifact causes recurring execution; an investigation is not recurrence prevention.

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