Question 320
A technical closure review begins after this incident: Security monitoring sees an unsigned PowerShell process spawning from a downloaded Office document. After the immediate situation is stabilized, what addresses the enabling failure?
- Remove the malicious task and validate other startup mechanisms
- Remove the malicious document and persistence and check secondary payloads
- Harden Office child-process restrictions and PowerShell telemetry
- Correlate Office process ancestry with PowerShell command-line and script block logs
- Suspend the malicious process tree and isolate the endpoint for collection
Explanation
Correct Answer
B:The first script may only download or launch further components; the affected workflow should not be considered trusted until the issue of whether a document triggered script-based malware is resolved.
Incorrect Answers
A:Cleanup should ensure the attacker did not create a second trigger; the other incident centers on which persistence artifact causes recurring execution, not this trusted restoration question about whether a document triggered script-based malware.
C:Application controls reduce this common execution chain; the goal is trusted restoration for whether a document triggered script-based malware. Future hardening is not current-state recovery.
D:Parent-child and script evidence connect the document action to execution; verification is not the corrective step in the decision about whether a document triggered script-based malware.
E:Targeted interruption limits payload activity while retaining execution history; the case needs trusted restoration addressing whether a document triggered script-based malware; temporary protection does not complete correction.
Question 321
To distinguish suspicion from confirmed impact, the SOC examines this case: A threat actor modifies an application's startup service to download a payload after every reboot. Which review would give the incident owner the strongest case-specific evidence?
- Disable the malicious startup entry and block its known distribution endpoint
- Review cron entries, file histories and spawned command lines
- Review service registry or unit definitions and outbound fetch records
- Restrict service creation and monitor changes to boot-time execution paths
Explanation
Correct Answer
C:A startup downloader can replenish malware removed from the filesystem; it connects the question of whether startup configuration will reinfect the system to an observable record and a reproducible check.
Incorrect Answers
A:Both trigger and destination must be addressed to interrupt re-execution; immediate protection does not substantiate findings in the decision about whether startup configuration will reinfect the system.
B:The scheduled execution pattern remains stable even when payload bytes rotate; the relevant condition for that step is why signature-only cleanup fails, which is not shown for whether startup configuration will reinfect the system.
D:Baseline enforcement exposes stealthy persistence modifications; for whether startup configuration will reinfect the system, prevention is not incident verification; evidence validation remains necessary.
Question 322
A responder is tasked with limiting immediate impact after this report: A malware outbreak spreads by portable media in a manufacturing facility with limited network connectivity. The first response plan must document the reported condition AND limit near-term harm. Select TWO case-specific steps. (Choose TWO.)
- Test incident overrides against routine endpoint management jobs
- Quarantine suspect removable drives and restrict new removable-media mounts
- Use controlled media transfer stations and removable-device policies
- Correlate USB insertion logs with first execution time on each affected station
- Scan and rebuild affected endpoints and sanitize or retire contaminated media
Explanation
Correct Answers
B:Physical medium control prevents another host from receiving the payload; within the combined response for whether removable media caused repeated reinfections, this supplies initial containment or preservation: the action limits the impact connected to whether removable media caused repeated reinfections without assuming the underlying flaw is already gone.
D:Device-use chronology can link a shared medium to infection; within the combined response for whether removable media caused repeated reinfections, this supplies evidence validation: the review should retain source and timing information relevant to whether removable media caused repeated reinfections.
Incorrect Answers
A:Runbook integration prevents accidental de-isolation; the other incident centers on why malware containment does not persist, not this initial containment or preservation question about whether removable media caused repeated reinfections.
C:Air-gapped operations still require ingress controls; the goal is initial containment or preservation for whether removable media caused repeated reinfections. Prevention cannot replace immediate action.
E:Cleanup must cover both endpoints and the transport vehicle; the case needs initial containment or preservation addressing whether removable media caused repeated reinfections; corrective follow-through follows initial protection.
Question 323
A triage analyst needs to test a report involving these details: A response team cannot safely analyze unknown executables because analysts run them on production desktops. Which evidence collection or correlation is most relevant to this claim?
- Review recovery images, clinical downtime procedures and network isolation dependencies
- Use disposable analysis environments with network controls and reset procedures
- Prohibit live execution on production endpoints and quarantine samples
- Inventory isolated sandbox capacity and access to safe forensic tooling
Explanation
Correct Answer
D:Untrusted code should be examined in a controlled environment that cannot reach business systems; that evidence directly tests the concern about whether malware analysis has appropriate isolation, rather than relying on a single unverified indicator.
Incorrect Answers
A:Medical device availability and supported reimaging constraints change the response options; it is meant to address whether malware response preparation covers critical medical endpoints, not evidence validation for whether malware analysis has appropriate isolation.
B:Safe laboratory processes support repeatable malware investigation; for whether malware analysis has appropriate isolation, prevention is not incident verification; evidence validation remains necessary.
C:The containment boundary prevents analysis from spreading malware; the requirement concerns whether malware analysis has appropriate isolation, so immediate protection does not substantiate findings.
Question 324
A post-incident audit examines the following failure mode: Several endpoints report unusual SMB connections and the same malicious process shortly after one laptop was infected. What recurring check or restriction would best address the weakness?
- Enforce driver-signing policies and restrict driver installation privileges
- Use host firewalls, patch management and lateral-movement detections
- Clean or rebuild infected systems and remediate the exploited SMB exposure
- Correlate east-west SMB flow records with common payload hashes and process starts
Explanation
Correct Answer
B:Layered controls reduce workstation-to-workstation spread; it closes a repeatable gap revealed by whether a worm propagated laterally without removing useful monitoring.
Incorrect Answers
A:Preventive controls limit unauthorized kernel code execution; the activity targets whether low-level tampering explains sensor loss; recurrence prevention here concerns whether a worm propagated laterally.
C:Removing payloads without closing the propagation route invites reinfection; when judging whether a worm propagated laterally, case recovery is not future-risk control; this is instead trusted restoration.
D:Shared artifacts and spread timing distinguish propagation from independent alerts; for whether a worm propagated laterally, an investigation is not recurrence prevention; recurrence prevention remains necessary.
Question 325
Post-containment analysis identified this issue for correction: The incident team stores a decryption key only inside the infected server's local password vault. Which remediation is supported by the observed root-cause conditions?
- Run samples in a controlled sandbox and preserve observations and hashes
- Secure an authorized independent copy of the recovery key under dual control
- Validate that a clean recovery environment can retrieve the protected key
- Maintain offline escrow and periodic key-recovery exercises
Explanation
Correct Answer
C:Access testing catches dependency failure before an emergency; this goes beyond temporary protection and addresses the failure identified through whether recovery keys remain accessible during host isolation.
Incorrect Answers
A:An isolated test enables behavioral analysis without risking corporate workloads; the relevant condition for that step is whether malware analysis has appropriate isolation, which is not shown for whether recovery keys remain accessible during host isolation.
B:Off-host custody permits restoration without relying on the infected machine; the case needs trusted restoration addressing whether recovery keys remain accessible during host isolation; temporary protection does not complete correction.
D:Resilience depends on accessible, well-governed cryptographic material; for whether recovery keys remain accessible during host isolation, future hardening is not current-state recovery; trusted restoration remains necessary.
Question 326
A responder is tasked with limiting immediate impact after this report: The team deletes ransomware notes but does not test recovered database transactions. The first response plan must document the reported condition AND limit near-term harm. Select TWO case-specific steps. (Choose TWO.)
- Restore the database from a verified clean recovery point and reconcile business transactions
- Run application consistency and transaction reconciliation against known-good data
- Hold external transaction processing until integrity checks pass
- Repair or reinstall trusted security instrumentation and retest detections
- Include functional restoration tests in ransomware recovery exercises
- Record infection timelines and periodically test restore-point integrity
Explanation
Correct Answers
B:Removal of a visible note does not prove database integrity; within the combined response for whether business service recovery is complete, this supplies evidence validation: it connects the question of whether business service recovery is complete to an observable record and a reproducible check.
C:Restricting writes prevents corrupt data from propagating; within the combined response for whether business service recovery is complete, this supplies initial containment or preservation: the scope of this restriction follows whether business service recovery is complete rather than indiscriminately changing unrelated assets.
Incorrect Answers
A:Transaction-level reconciliation and a trustworthy recovery point address integrity failures beyond ransomware-note removal; for whether business service recovery is complete, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
D:Recovery should restore the ability to observe subsequent malicious activity; the other incident centers on whether recovery validation includes monitoring health, not this initial containment or preservation question about whether business service recovery is complete.
E:Service success requires more than malware absence; the case needs initial containment or preservation addressing whether business service recovery is complete; prevention cannot replace immediate action.
F:Backup selection improves when detection history is available; the activity targets whether a backup predates attacker persistence; initial containment or preservation here concerns whether business service recovery is complete.
Question 327
A control owner is preparing preventive actions after observing: An organization discovers that endpoint alerts are retained for only a day despite frequent weekend outages. What tested hardening or process measure follows from the lessons learned?
- Use disposable analysis environments with network controls and reset procedures
- Review EDR event retention, log export and investigation access settings
- Test weekend investigation scenarios and evidence retrieval deadlines
- Establish adequate retention with access controls and retrieval tests
Explanation
Correct Answer
C:Preparedness should reflect realistic detection latency; a periodic review of this safeguard can track the risk described by whether malware telemetry will survive delayed discovery.
Incorrect Answers
A:Safe laboratory processes support repeatable malware investigation; it is meant to address whether malware analysis has appropriate isolation, not recurrence prevention for whether malware telemetry will survive delayed discovery.
B:Insufficient history can hide the initial payload and lateral movement; an investigation is not recurrence prevention in the decision about whether malware telemetry will survive delayed discovery.
D:Retention must support actual investigation windows and response obligations; when judging whether malware telemetry will survive delayed discovery, case recovery is not future-risk control; this is instead trusted restoration.
Question 328
A long-term control assessment uses this recent event: A recovered workstation looks clean but EDR telemetry stops immediately after reintegration. Which change provides measurable prevention rather than an emergency workaround?
- Repair or reinstall trusted security instrumentation and retest detections
- Check sensor heartbeat, policy status and event ingestion after network return
- Protect build systems and require approval for baseline configuration changes
- Make EDR-health checks a formal exit criterion for quarantine
Explanation
Correct Answer
D:Monitoring continuity reduces silent reinfection; it closes a repeatable gap revealed by whether recovery validation includes monitoring health without removing useful monitoring.
Incorrect Answers
A:Recovery should restore the ability to observe subsequent malicious activity; when judging whether recovery validation includes monitoring health, case recovery is not future-risk control; this is instead trusted restoration.
B:An endpoint without functioning telemetry cannot be considered fully verified; for whether recovery validation includes monitoring health, an investigation is not recurrence prevention; recurrence prevention remains necessary.
C:Supply-chain integrity is part of malware prevention; the relevant condition for that step is whether deployment automation is reintroducing malware, which is not shown for whether recovery validation includes monitoring health.
Question 329
A security analyst is asked to validate the following reported behavior: An engineering team disables antivirus exclusions review because build tools occasionally create false positives. Which check can confirm the relevant facts before a disruptive action?
- Inspect endpoint policy scope and detections in excluded directories
- Inspect Office macro trust state, file origin markings and process ancestry
- Narrow or revoke unsafe exclusions after testing legitimate workloads
- Require expiration, owner and justification for every exclusion
Explanation
Correct Answer
A:Unbounded exceptions can make attacker-controlled paths invisible; it connects the question of whether broad exclusions hide malware execution to an observable record and a reproducible check.
Incorrect Answers
B:Internet-origin macros provide an avoidable initial execution surface; the other incident centers on whether document execution controls are effective, not this evidence validation question about whether broad exclusions hide malware execution.
C:Restoring visibility reduces malware concealment without needlessly blocking builds; the requirement concerns whether broad exclusions hide malware execution, so immediate protection does not substantiate findings.
D:Governed exceptions limit long-term exposure; the goal is evidence validation for whether broad exclusions hide malware execution. Prevention is not incident verification.
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?
- Tie reimaging playbooks to credential and certificate reissuance checks
- Choose a verified clean restore point and apply missing security fixes
- Rotate machine credentials and validate domain enrollment under approved procedure
- 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.