Question 270
A containment decision is required for this incident: A rebuilt endpoint is immediately rejoined to an identity domain where its machine credentials are suspected stolen. What action constrains the incident at the affected point of control?
- Do not reconnect the restored image until it is investigated in isolation
- Tie reimaging playbooks to credential and certificate reissuance checks
- Review machine-account activity and authentication anomalies during compromise
- Keep the rebuilt device out of privileged network segments until identity trust is reset
- Rotate machine credentials and validate domain enrollment under approved procedure
Explanation
Correct Answer
D:Network gating limits re-entry while identity risk remains; it protects the affected workflow while investigators continue resolving whether endpoint trust is safe to restore.
Incorrect Answers
A:A latent backdoor can reactivate on an apparently recovered server; that method could help with whether a backup predates attacker persistence; the initial containment or preservation decision here involves whether endpoint trust is safe to restore.
B:Integrated recovery prevents old credentials from surviving the rebuild; the requirement concerns whether endpoint trust is safe to restore, so prevention cannot replace immediate action.
C:A clean disk does not automatically repair exposed identity secrets; the goal is initial containment or preservation for whether endpoint trust is safe to restore. Investigation alone does not control current conditions.
E:Trust restoration must address the identity plane as well as local files; the case needs initial containment or preservation addressing whether endpoint trust is safe to restore; corrective follow-through follows initial protection.
Question 271
The coordinator needs corrective action rather than another alert. The event was: A recovered workstation looks clean but EDR telemetry stops immediately after reintegration. Which follow-through step verifies the weakness was removed?
- Repair or reinstall trusted security instrumentation and retest detections
- Restore the database from a verified clean recovery point and reconcile business transactions
- Keep the asset in restricted network access pending sensor restoration
- Check sensor heartbeat, policy status and event ingestion after network return
- Make EDR-health checks a formal exit criterion for quarantine
- Repair the trusted image or manifest and redeploy only signed verified content
Explanation
Correct Answer
A:Recovery should restore the ability to observe subsequent malicious activity; the recovery decision is tied to whether recovery validation includes monitoring health, not merely to reduced alert volume.
Incorrect Answers
B:Transaction-level reconciliation and a trustworthy recovery point address integrity failures beyond ransomware-note removal; it is meant to address whether business service recovery is complete, not trusted restoration for whether recovery validation includes monitoring health.
C:Limited connectivity prevents a blind return to production; the case needs trusted restoration addressing whether recovery validation includes monitoring health; temporary protection does not complete correction.
D:An endpoint without functioning telemetry cannot be considered fully verified; when judging whether recovery validation includes monitoring health, verification is not the corrective step; this is instead evidence validation.
E:Monitoring continuity reduces silent reinfection; for whether recovery validation includes monitoring health, future hardening is not current-state recovery; trusted restoration remains necessary.
F:Root-cause cleanup must include the software distribution pipeline; 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 272
For the next control cycle, the responder supplies this incident history: A response team cannot safely analyze unknown executables because analysts run them on production desktops. Which ongoing safeguard should be implemented and tested?
- Maintain manufacturer-approved recovery kits and clinical response exercises
- Use disposable analysis environments with network controls and reset procedures
- Maintain offline escrow and periodic key-recovery exercises
- Inventory isolated sandbox capacity and access to safe forensic tooling
- Run samples in a controlled sandbox and preserve observations and hashes
- Prohibit live execution on production endpoints and quarantine samples
Explanation
Correct Answer
B:Safe laboratory processes support repeatable malware investigation; a periodic review of this safeguard can track the risk described by whether malware analysis has appropriate isolation.
Incorrect Answers
A:Pretested procedures reduce operational risk during outbreaks; this serves whether malware response preparation covers critical medical endpoints, whereas the requested result is recurrence prevention involving whether malware analysis has appropriate isolation.
C:Resilience depends on accessible, well-governed cryptographic material; this serves whether recovery keys remain accessible during host isolation, whereas the requested result is recurrence prevention involving whether malware analysis has appropriate isolation.
D:Untrusted code should be examined in a controlled environment that cannot reach business systems; when judging whether malware analysis has appropriate isolation, an investigation is not recurrence prevention; this is instead evidence validation.
E:An isolated test enables behavioral analysis without risking corporate workloads; for whether malware analysis has appropriate isolation, case recovery is not future-risk control; recurrence prevention remains necessary.
F:The containment boundary prevents analysis from spreading malware; the requirement concerns whether malware analysis has appropriate isolation, so one-time protection is not durable prevention.
Question 273
A responder is tasked with limiting immediate impact after this report: An endpoint's network isolation is reversed automatically by an unapproved management script. Which immediate safeguard protects the case while later remediation is planned?
- Compare firewall and EDR isolation changes against automation run histories
- Quarantine suspect removable drives and restrict new removable-media mounts
- Correct automation ownership and verify containment survives a policy cycle
- Suspend the conflicting automation and apply an authorized network quarantine
Explanation
Correct Answer
D:Isolation must remain effective while active compromise is investigated; the protective decision should be recorded and its effect tested against why malware containment does not persist.
Incorrect Answers
A:Control-plane conflict can reopen communication after responders block it; when judging why malware containment does not persist, investigation alone does not control current conditions; this is instead evidence validation.
B:Physical medium control prevents another host from receiving the payload; it is meant to address whether removable media caused repeated reinfections, not initial containment or preservation for why malware containment does not persist.
C:Durable remediation requires fixing the conflicting control; the requirement concerns why malware containment does not persist, so corrective follow-through follows initial protection.
Question 274
Following initial stabilization, the team must prove recovery for this case: A user reports a browser extension silently reading sensitive form fields after a recent update. Which correction must be verified before the affected service or process is restored?
- Allowlist reviewed extensions and monitor new sensitive permissions
- Investigate the injector and persistence mechanism before rebuilding the endpoint
- Disable the suspicious extension through managed browser policy
- Remove the extension and audit any credentials or data it may have collected
Explanation
Correct Answer
D:Deleting the add-on alone does not reverse possible disclosure; this goes beyond temporary protection and addresses the failure identified through whether the extension update introduced malicious behavior.
Incorrect Answers
A:Governed extensions limit this endpoint attack surface; the requirement concerns whether the extension update introduced malicious behavior, so future hardening is not current-state recovery.
B:A clean browser executable does not exclude compromise in the process tree; it is meant to address whether in-memory execution explains the alert, not trusted restoration for whether the extension update introduced malicious behavior.
C:Central disablement stops its access across affected browsers; temporary protection does not complete correction in the decision about whether the extension update introduced malicious behavior.
Question 275
The team requires traceable proof for an event described as follows: The team deletes ransomware notes but does not test recovered database transactions. What should be correlated to determine whether the case finding is justified?
- Include functional restoration tests in ransomware recovery exercises
- Hold external transaction processing until integrity checks pass
- Check sensor heartbeat, policy status and event ingestion after network return
- Run application consistency and transaction reconciliation against known-good data
Explanation
Correct Answer
D:Removal of a visible note does not prove database integrity; this evidence is scoped to whether business service recovery is complete, not a generic system-health reading.
Incorrect Answers
A:Service success requires more than malware absence; the goal is evidence validation for whether business service recovery is complete. Prevention is not incident verification.
B:Restricting writes prevents corrupt data from propagating; immediate protection does not substantiate findings in the decision about whether business service recovery is complete.
C:An endpoint without functioning telemetry cannot be considered fully verified; the activity targets whether recovery validation includes monitoring health; evidence validation here concerns whether business service recovery is complete.
Question 276
The recovery owner is reviewing the underlying failure in this report: A server repeatedly creates an unfamiliar scheduled task that launches a remote script at midnight. What action most directly repairs the affected access, evidence or system state?
- Inspect scheduled-task definitions, creation events and task action paths
- Alert on unusual scheduled-task registration by non-administrative workflows
- Disable the suspect task and block its remote script endpoint
- Remove the malicious document and persistence and check secondary payloads
- Remove the malicious task and validate other startup mechanisms
Explanation
Correct Answer
E:Cleanup should ensure the attacker did not create a second trigger; the resulting state needs verification against the original concern: which persistence artifact causes recurring execution.
Incorrect Answers
A:These records identify the launch target and the identity establishing persistence; the requirement concerns which persistence artifact causes recurring execution, so verification is not the corrective step.
B:Monitoring persistence changes provides earlier detection; the goal is trusted restoration for which persistence artifact causes recurring execution. Future hardening is not current-state recovery.
C:Stopping both trigger and delivery path limits execution; temporary protection does not complete correction in the decision about which persistence artifact causes recurring execution.
D:The first script may only download or launch further components; the other incident centers on whether a document triggered script-based malware, not this trusted restoration question about which persistence artifact causes recurring execution.
Question 277
Before granting routine access again, the team reviews this case: Several endpoints report unusual SMB connections and the same malicious process shortly after one laptop was infected. What must the response owner validate as part of safe recovery?
- Segment infected hosts and restrict unnecessary SMB access between workstations
- Clean or rebuild infected systems and remediate the exploited SMB exposure
- Rotate affected credentials and remove unauthorized services after forensic collection
- Use host firewalls, patch management and lateral-movement detections
Explanation
Correct Answer
B:Removing payloads without closing the propagation route invites reinfection; the affected workflow should not be considered trusted until the issue of whether a worm propagated laterally is resolved.
Incorrect Answers
A:Blocking lateral channels reduces the outbreak rate; the goal is trusted restoration for whether a worm propagated laterally. Temporary protection does not complete correction.
C:Restoration requires removal of both access and persistence; the relevant condition for that step is whether stolen credentials enabled lateral movement, which is not shown for whether a worm propagated laterally.
D:Layered controls reduce workstation-to-workstation spread; when judging whether a worm propagated laterally, future hardening is not current-state recovery; this is instead recurrence prevention.
Question 278
Active first response is underway for the following condition: An application server begins mining cryptocurrency and generating high CPU usage from a newly deployed container image. What is the most appropriate short-term restriction or first-response decision?
- Redeploy from a verified image and rotate exposed workload secrets
- Stop the offending container and restrict its egress while preserving metadata
- Suspend the malicious process tree and isolate the endpoint for collection
- Sign and scan images and restrict unapproved registry sources
- Compare image provenance, running process tree and outbound mining-pool traffic
Explanation
Correct Answer
B:Containment stops resource theft without necessarily destroying the image evidence; this is a first-response safeguard for whether a malicious image is responsible for compute abuse, not a substitute for full root-cause analysis.
Incorrect Answers
A:A compromised image or credential can persist across simple restarts; the case needs initial containment or preservation addressing whether a malicious image is responsible for compute abuse; corrective follow-through follows initial protection.
C:Targeted interruption limits payload activity while retaining execution history; that method could help with whether a document triggered script-based malware; the initial containment or preservation decision here involves whether a malicious image is responsible for compute abuse.
D:Software supply-chain controls reduce malicious workload deployment; the requirement concerns whether a malicious image is responsible for compute abuse, so prevention cannot replace immediate action.
E:Container identity and runtime behavior establish whether the workload is compromised; the goal is initial containment or preservation for whether a malicious image is responsible for compute abuse. Investigation alone does not control current conditions.
Question 279
A post-incident audit examines the following failure mode: A threat actor modifies an application's startup service to download a payload after every reboot. What recurring check or restriction would best address the weakness?
- Audit privileged cron modifications and restrict write access to job directories
- Restore service configuration from trusted baselines and inspect related startup entries
- Review service registry or unit definitions and outbound fetch records
- Restrict service creation and monitor changes to boot-time execution paths
Explanation
Correct Answer
D:Baseline enforcement exposes stealthy persistence modifications; this turns the weakness behind whether startup configuration will reinfect the system into a measurable prevention requirement.
Incorrect Answers
A:Change monitoring targets persistence rather than static hashes; that method could help with why signature-only cleanup fails; the recurrence prevention decision here involves whether startup configuration will reinfect the system.
B:Completeness matters because multiple persistence mechanisms can coexist; the case needs recurrence prevention addressing whether startup configuration will reinfect the system; case recovery is not future-risk control.
C:A startup downloader can replenish malware removed from the filesystem; when judging whether startup configuration will reinfect the system, an investigation is not recurrence prevention; this is instead evidence validation.
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?
- Pause the offending deployment job and quarantine its source artifacts
- Compare management manifests and agent execution times with service recreation
- Protect build systems and require approval for baseline configuration changes
- 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.