ECCouncil 212-89 (EC-Council Certified Incident Handler) Practice Test 29

Question 280

Before making any disruptive change, an investigator is handed these observations: Following cleanup, responders cannot explain why the same malicious service reappears after a configuration-management run. Which source best supports the incident finding before responders modify the environment?

  1. Pause the offending deployment job and quarantine its source artifacts
  2. Compare management manifests and agent execution times with service recreation
  3. Protect build systems and require approval for baseline configuration changes
  4. Compare snapshot creation times against the earliest credible intrusion indicator

Explanation

Correct Answer

B:

A compromised image or script can reinstall artifacts on clean endpoints; that evidence directly tests the concern about whether deployment automation is reintroducing malware, rather than relying on a single unverified indicator.

Incorrect Answers

A:

Stopping distribution prevents repeated contamination; the requirement concerns whether deployment automation is reintroducing malware, so immediate protection does not substantiate findings.

C:

Supply-chain integrity is part of malware prevention; prevention is not incident verification in the decision about whether deployment automation is reintroducing malware.

D:

Pre-encryption does not necessarily mean pre-compromise; it is meant to address whether a backup predates attacker persistence, not evidence validation for whether deployment automation is reintroducing malware.

Question 281

The response record begins with an unresolved observation: A workstation repeatedly contacts algorithmically generated domains after an unexplained process starts at login. What documentation or telemetry would most reliably support the incident determination?

  1. Correlate DNS query sequences with process creation and network connections
  2. Detect unusual NXDOMAIN bursts and rare-domain patterns
  3. Decode and correlate command-line telemetry with parent process and remote session source
  4. Isolate the host's outbound traffic and preserve relevant DNS telemetry

Explanation

Correct Answer

A:

High-volume pseudo-random lookups tied to one process support a DGA hypothesis; this permits a traceable finding about whether the host exhibits domain-generation command traffic before the team makes a disruptive change.

Incorrect Answers

B:

Behavioral rules can catch domain rotation without static block lists; when judging whether the host exhibits domain-generation command traffic, prevention is not incident verification; this is instead recurrence prevention.

C:

Signed utilities can still run attacker instructions that reveal intent; this serves whether living-off-the-land execution masks malicious behavior, whereas the requested result is evidence validation involving whether the host exhibits domain-generation command traffic.

D:

The block curbs command retrieval while retaining host evidence; the requirement concerns whether the host exhibits domain-generation command traffic, so immediate protection does not substantiate findings.

Question 282

Following initial stabilization, the team must prove recovery for this case: A trojan uses a compromised service account to read databases after its file is deleted. Which correction must be verified before the affected service or process is restored?

  1. Rotate affected secrets and restore least-privilege account permissions
  2. Revoke active tokens and restrict the account while retaining audit logs
  3. Rebuild affected hosts and restore files from verified preinfection backups
  4. Use managed identities where possible and monitor anomalous service-account use

Explanation

Correct Answer

A:

Changing the credential closes the persistent unauthorized access path; the change should be tested before unrestricted operations resume for the event involving which access path remains dangerous.

Incorrect Answers

B:

Identity containment stops continued database access; the goal is trusted restoration for which access path remains dangerous. Temporary protection does not complete correction.

C:

A clean source is required before trusted data restoration; the activity targets which containment step stops ongoing encryption; trusted restoration here concerns which access path remains dangerous.

D:

Reducing reusable secrets lowers credential replay risk; the case needs trusted restoration addressing which access path remains dangerous; future hardening is not current-state recovery.

Question 283

A post-incident audit examines the following failure mode: Ransomware starts encrypting a file share while snapshots remain healthy and accessible. What recurring check or restriction would best address the weakness?

  1. Rebuild affected hosts and restore files from verified preinfection backups
  2. Disconnect the infected client and revoke its write access to the share
  3. Use least-privilege share access and immutable backup protection
  4. Correlate file rename bursts with the initiating process and SMB session
  5. Alert on unauthorized backup deletion and maintain immutable offline copies

Explanation

Correct Answer

C:

Reduced write permissions and protected copies limit future losses; this turns the weakness behind which containment step stops ongoing encryption into a measurable prevention requirement.

Incorrect Answers

A:

A clean source is required before trusted data restoration; case recovery is not future-risk control in the decision about which containment step stops ongoing encryption.

B:

Stopping the active writer limits damage while preserving clean snapshots; the case needs recurrence prevention addressing which containment step stops ongoing encryption; one-time protection is not durable prevention.

D:

Identifying the source host helps stop active write activity; for which containment step stops ongoing encryption, an investigation is not recurrence prevention; recurrence prevention remains necessary.

E:

Protection outside attacker control improves recoverability; the relevant condition for that step is whether backup-suppression activity is part of the attack, which is not shown for which containment step stops ongoing encryption.

Question 284

The incident is resolved, but its root weakness still requires policy attention: A server is restored from a snapshot taken after the initial compromise but before encryption. What durable process or monitoring change would make a repeat less likely?

  1. Compare snapshot creation times against the earliest credible intrusion indicator
  2. Record infection timelines and periodically test restore-point integrity
  3. Include functional restoration tests in ransomware recovery exercises
  4. Choose a verified clean restore point and apply missing security fixes

Explanation

Correct Answer

B:

Backup selection improves when detection history is available; a periodic review of this safeguard can track the risk described by whether a backup predates attacker persistence.

Incorrect Answers

A:

Pre-encryption does not necessarily mean pre-compromise; for whether a backup predates attacker persistence, an investigation is not recurrence prevention; recurrence prevention remains necessary.

C:

Service success requires more than malware absence; it is meant to address whether business service recovery is complete, not recurrence prevention for whether a backup predates attacker persistence.

D:

Trusted recovery requires both clean data and closed entry paths; case recovery is not future-risk control in the decision about whether a backup predates attacker persistence.

Question 285

Before granting routine access again, the team reviews this case: A user downloads an executable from a spoofed update pop-up despite corporate patch management. Which THREE case-specific measures form the verification, initial safeguard and corrective recovery stages, in that order of purpose? (Choose THREE.)

  1. Use application allowlisting and teach verified software-update paths
  2. Review download origin, browser events and installer signature information
  3. Require expiration, owner and justification for every exclusion
  4. Remove the installer and temporarily prevent execution of similar unapproved binaries
  5. Block internet-origin macros and use signed workflows for approved automation
  6. Rebuild or cleanse impacted devices and restore trusted update channels

Explanation

Correct Answers

B:

An untrusted web installer differs from centrally managed software distribution; within the combined response for why user-driven fake updates bypassed approved channels, this supplies evidence validation: this evidence is scoped to why user-driven fake updates bypassed approved channels, not a generic system-health reading.

D:

Execution control stops subsequent users from running the same payload; within the combined response for why user-driven fake updates bypassed approved channels, this supplies initial containment or preservation: it restricts the path implicated in why user-driven fake updates bypassed approved channels; later eradication and restoration remain separate decisions.

F:

Recovery must distinguish the malicious installer from authorized patches; within the combined response for why user-driven fake updates bypassed approved channels, this supplies trusted restoration: the affected workflow should not be considered trusted until the issue of why user-driven fake updates bypassed approved channels is resolved.

Incorrect Answers

A:

Policy and awareness reduce social engineering that impersonates updates; the case needs trusted restoration addressing why user-driven fake updates bypassed approved channels; future hardening is not current-state recovery.

C:

Governed exceptions limit long-term exposure; the other incident centers on whether broad exclusions hide malware execution, not this trusted restoration question about why user-driven fake updates bypassed approved channels.

E:

Trusted authoring controls reduce malware entry opportunities; the activity targets whether document execution controls are effective; trusted restoration here concerns why user-driven fake updates bypassed approved channels.

Question 286

The incident is not yet closed. Response staff report: A hospital runs a malware drill but lacks clean images and emergency isolation plans for radiology workstations. Which short-term measure protects the affected process or asset?

  1. Secure an authorized independent copy of the recovery key under dual control
  2. Coordinate isolation decisions with clinical safety owners and segment affected devices
  3. Validate approved images and vendor-assisted restoration in a test environment
  4. Review recovery images, clinical downtime procedures and network isolation dependencies
  5. Maintain manufacturer-approved recovery kits and clinical response exercises

Explanation

Correct Answer

B:

Patient-care continuity must be considered alongside attack containment; it protects the affected workflow while investigators continue resolving whether malware response preparation covers critical medical endpoints.

Incorrect Answers

A:

Off-host custody permits restoration without relying on the infected machine; the activity targets whether recovery keys remain accessible during host isolation; initial containment or preservation here concerns whether malware response preparation covers critical medical endpoints.

C:

Supported recovery protects safety-critical integrations rather than improvising reinstallation; the case needs initial containment or preservation addressing whether malware response preparation covers critical medical endpoints; corrective follow-through follows initial protection.

D:

Medical device availability and supported reimaging constraints change the response options; when judging whether malware response preparation covers critical medical endpoints, investigation alone does not control current conditions; this is instead evidence validation.

E:

Pretested procedures reduce operational risk during outbreaks; for whether malware response preparation covers critical medical endpoints, prevention cannot replace immediate action; initial containment or preservation remains necessary.

Question 287

A long-term control assessment uses this recent event: An engineering team disables antivirus exclusions review because build tools occasionally create false positives. Which change provides measurable prevention rather than an emergency workaround?

  1. Use unique managed local administrator passwords with least privilege
  2. Tune specific false positives and verify legitimate build tasks still work
  3. Inspect endpoint policy scope and detections in excluded directories
  4. Require expiration, owner and justification for every exclusion

Explanation

Correct Answer

D:

Governed exceptions limit long-term exposure; this turns the weakness behind whether broad exclusions hide malware execution into a measurable prevention requirement.

Incorrect Answers

A:

Non-reusable local secrets contain compromise impact; the relevant condition for that step is why one infected device can lead to many endpoint logins, which is not shown for whether broad exclusions hide malware execution.

B:

Precise policies improve both protection and availability; for whether broad exclusions hide malware execution, case recovery is not future-risk control; recurrence prevention remains necessary.

C:

Unbounded exceptions can make attacker-controlled paths invisible; the requirement concerns whether broad exclusions hide malware execution, so an investigation is not recurrence prevention.

Question 288

Before making any disruptive change, an investigator is handed these observations: A Windows endpoint contains an executable masquerading as a system process in a user-writable folder. Which source best supports the incident finding before responders modify the environment?

  1. Check signer, executable path, hash and parent process rather than display name
  2. Alert on system-like process names executing from writable directories
  3. Examine module-load telemetry, library path and file creation times
  4. Quarantine the user-writable binary and isolate related process execution

Explanation

Correct Answer

A:

A familiar name outside the expected protected directory can mask malware; for this investigation, the relevant uncertainty is whether a process name is being spoofed, so independent confirmation matters.

Incorrect Answers

B:

Path-aware monitoring distinguishes impersonation from normal OS activity; the goal is evidence validation for whether a process name is being spoofed. Prevention is not incident verification.

C:

A legitimate executable can load a malicious library from an unsafe search location; it is meant to address whether DLL side-loading caused the activity, not evidence validation for whether a process name is being spoofed.

D:

Action against the real file avoids disrupting the genuine operating-system component; the case needs evidence validation addressing whether a process name is being spoofed; immediate protection does not substantiate findings.

Question 289

The response record begins with an unresolved observation: A malicious binary uses a trusted signed application to load a sidecar library from a writable directory. What documentation or telemetry would most reliably support the incident determination?

  1. Control executable search paths and monitor unsigned modules in sensitive applications
  2. Check signer, executable path, hash and parent process rather than display name
  3. Examine module-load telemetry, library path and file creation times
  4. Quarantine the tampered application directory and block execution of the sidecar module

Explanation

Correct Answer

C:

A legitimate executable can load a malicious library from an unsafe search location; it makes the determination of whether DLL side-loading caused the activity defensible and reviewable by the incident owner.

Incorrect Answers

A:

Reducing side-loading opportunities makes abuse harder; the case needs evidence validation addressing whether DLL side-loading caused the activity; prevention is not incident verification.

B:

A familiar name outside the expected protected directory can mask malware; it is meant to address whether a process name is being spoofed, not evidence validation for whether DLL side-loading caused the activity.

D:

Containing the loading path prevents repeated execution without blaming the signer alone; the requirement concerns whether DLL side-loading caused the activity, so immediate protection does not substantiate findings.

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.

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