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.
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?
- Rebuild affected hosts and restore files from verified preinfection backups
- Correlate file rename bursts with the initiating process and SMB session
- Disconnect the infected client and revoke its write access to the share
- 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?
- Allowlist reviewed extensions and monitor new sensitive permissions
- Inspect extension IDs, permission changes, update provenance and browser events
- Disable the suspicious extension through managed browser policy
- 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?
- Correct automation ownership and verify containment survives a policy cycle
- Compare firewall and EDR isolation changes against automation run histories
- Use controlled media transfer stations and removable-device policies
- 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?
- Inspect scheduled-task definitions, creation events and task action paths
- Disable the suspect task and block its remote script endpoint
- Correlate Office process ancestry with PowerShell command-line and script block logs
- 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?
- Compare system proxy settings, installed certificates and process listeners
- Remove malicious proxy components and distrust injected certificates
- Use managed identities where possible and monitor anomalous service-account use
- 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?
- Disable the malicious startup entry and block its known distribution endpoint
- Review service registry or unit definitions and outbound fetch records
- Disable the unauthorized proxy and isolate the endpoint for credential assessment
- 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?
- Disable the offending cron entry and prevent outbound payload retrieval
- Rotate affected secrets and restore least-privilege account permissions
- Audit privileged cron modifications and restrict write access to job directories
- 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?
- Rotate machine credentials and validate domain enrollment under approved procedure
- Restore the database from a verified clean recovery point and reconcile business transactions
- Include functional restoration tests in ransomware recovery exercises
- 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?
- Remove the associated persistence and examine credentials used by the process
- Detect unusual NXDOMAIN bursts and rare-domain patterns
- Clean or rebuild infected systems and remediate the exploited SMB exposure
- Isolate the host's outbound traffic and preserve relevant DNS telemetry
- 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?
- Restrict exposed administrative access and isolate endpoints using the same credentials
- Inspect endpoint policy scope and detections in excluded directories
- Tune specific false positives and verify legitimate build tasks still work
- 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.