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?
- Harden Office child-process restrictions and PowerShell telemetry
- Remove the malicious task and validate other startup mechanisms
- Alert on unusual scheduled-task registration by non-administrative workflows
- 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.
Question 301
The team wants a measurable hardening change following this situation: A user downloads an executable from a spoofed update pop-up despite corporate patch management. What improvement best addresses the root weakness in a future incident?
- Use application allowlisting and teach verified software-update paths
- Rebuild or cleanse impacted devices and restore trusted update channels
- Block internet-origin macros and use signed workflows for approved automation
- Review download origin, browser events and installer signature information
Explanation
Correct Answer
A:Policy and awareness reduce social engineering that impersonates updates; the ongoing control is targeted at why user-driven fake updates bypassed approved channels, rather than a one-time emergency fix.
Incorrect Answers
B:Recovery must distinguish the malicious installer from authorized patches; when judging why user-driven fake updates bypassed approved channels, case recovery is not future-risk control; this is instead trusted restoration.
C:Trusted authoring controls reduce malware entry opportunities; this serves whether document execution controls are effective, whereas the requested result is recurrence prevention involving why user-driven fake updates bypassed approved channels.
D:An untrusted web installer differs from centrally managed software distribution; the requirement concerns why user-driven fake updates bypassed approved channels, so an investigation is not recurrence prevention.
Question 302
Cleanup is not considered complete. The case record describes: A hospital runs a malware drill but lacks clean images and emergency isolation plans for radiology workstations. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Coordinate isolation decisions with clinical safety owners and segment affected devices
- Maintain manufacturer-approved recovery kits and clinical response exercises
- Validate that a clean recovery environment can retrieve the protected key
- Validate approved images and vendor-assisted restoration in a test environment
Explanation
Correct Answer
D:Supported recovery protects safety-critical integrations rather than improvising reinstallation; technical closure should demonstrate that the control gap behind whether malware response preparation covers critical medical endpoints is actually corrected.
Incorrect Answers
A:Patient-care continuity must be considered alongside attack containment; the case needs trusted restoration addressing whether malware response preparation covers critical medical endpoints; temporary protection does not complete correction.
B:Pretested procedures reduce operational risk during outbreaks; when judging whether malware response preparation covers critical medical endpoints, future hardening is not current-state recovery; this is instead recurrence prevention.
C:Access testing catches dependency failure before an emergency; this serves whether recovery keys remain accessible during host isolation, whereas the requested result is trusted restoration involving whether malware response preparation covers critical medical endpoints.
Question 303
A control owner is preparing preventive actions after observing: A user reports a browser extension silently reading sensitive form fields after a recent update. What tested hardening or process measure follows from the lessons learned?
- Inspect extension IDs, permission changes, update provenance and browser events
- Control executable search paths and monitor unsigned modules in sensitive applications
- Allowlist reviewed extensions and monitor new sensitive permissions
- Remove the extension and audit any credentials or data it may have collected
Explanation
Correct Answer
C:Governed extensions limit this endpoint attack surface; its effectiveness can be exercised against the warning conditions associated with whether the extension update introduced malicious behavior.
Incorrect Answers
A:New host permissions and update history can explain unexpected data access; the goal is recurrence prevention for whether the extension update introduced malicious behavior. An investigation is not recurrence prevention.
B:Reducing side-loading opportunities makes abuse harder; the relevant condition for that step is whether DLL side-loading caused the activity, which is not shown for whether the extension update introduced malicious behavior.
D:Deleting the add-on alone does not reverse possible disclosure; when judging whether the extension update introduced malicious behavior, case recovery is not future-risk control; this is instead trusted restoration.
Question 304
The first task is to corroborate an alert. The case notes state: A server is restored from a snapshot taken after the initial compromise but before encryption. What should the investigator examine to distinguish a substantiated finding from an assumption?
- Run application consistency and transaction reconciliation against known-good data
- Record infection timelines and periodically test restore-point integrity
- Compare snapshot creation times against the earliest credible intrusion indicator
- Do not reconnect the restored image until it is investigated in isolation
Explanation
Correct Answer
C:Pre-encryption does not necessarily mean pre-compromise; it makes the determination of whether a backup predates attacker persistence defensible and reviewable by the incident owner.
Incorrect Answers
A:Removal of a visible note does not prove database integrity; the relevant condition for that step is whether business service recovery is complete, which is not shown for whether a backup predates attacker persistence.
B:Backup selection improves when detection history is available; when judging whether a backup predates attacker persistence, prevention is not incident verification; this is instead recurrence prevention.
D:A latent backdoor can reactivate on an apparently recovered server; the requirement concerns whether a backup predates attacker persistence, so immediate protection does not substantiate findings.
Question 305
The response team seeks the relevant control point for this problem: A finance workstation still allows unsigned macros from internet-downloaded spreadsheets. Investigators need both a defensible factual finding and a limited immediate safeguard. Which TWO actions jointly satisfy those requirements? (Choose TWO.)
- Block internet-origin macros and use signed workflows for approved automation
- Rebuild or cleanse impacted devices and restore trusted update channels
- Inspect Office macro trust state, file origin markings and process ancestry
- Remove persistence, validate the host and recover any modified data
- Disable unauthorized macro execution and quarantine the offending attachment
Explanation
Correct Answers
C:Internet-origin macros provide an avoidable initial execution surface; within the combined response for whether document execution controls are effective, this supplies evidence validation: this permits a traceable finding about whether document execution controls are effective before the team makes a disruptive change.
E:Control prevents additional users from invoking the same script; within the combined response for whether document execution controls are effective, this supplies initial containment or preservation: it protects the affected workflow while investigators continue resolving whether document execution controls are effective.
Incorrect Answers
A:Trusted authoring controls reduce malware entry opportunities; when judging whether document execution controls are effective, prevention cannot replace immediate action; this is instead recurrence prevention.
B:Recovery must distinguish the malicious installer from authorized patches; that method could help with why user-driven fake updates bypassed approved channels; the initial containment or preservation decision here involves whether document execution controls are effective.
D:Execution prevention does not eliminate effects already present; the goal is initial containment or preservation for whether document execution controls are effective. Corrective follow-through follows initial protection.
Question 306
An evidence-led review starts with the following report: A domain controller records privileged authentication from a compromised workstation followed by remote service creation. What investigation should establish the disputed activity and its timeline?
- Use tiered administration and remote-service creation monitoring
- Join authentication events with remote service installation and source-host timing
- Disable the implicated privileged sessions and isolate both source and target
- Correlate DNS query sequences with process creation and network connections
- Rotate affected credentials and remove unauthorized services after forensic collection
Explanation
Correct Answer
B:The sequence ties credential use to code execution on another machine; the objective is to establish whether stolen credentials enabled lateral movement; the result can then guide the later protective decision.
Incorrect Answers
A:Separation of privileged use limits credential theft blast radius; the goal is evidence validation for whether stolen credentials enabled lateral movement. Prevention is not incident verification.
C:Containing identities and endpoints stops further remote execution paths; the case needs evidence validation addressing whether stolen credentials enabled lateral movement; immediate protection does not substantiate findings.
D:High-volume pseudo-random lookups tied to one process support a DGA hypothesis; the activity targets whether the host exhibits domain-generation command traffic; evidence validation here concerns whether stolen credentials enabled lateral movement.
E:Restoration requires removal of both access and persistence; for whether stolen credentials enabled lateral movement, recovery is not factual verification; evidence validation remains necessary.
Question 307
Active first response is underway for the following condition: A compromised Linux server runs a malicious cron job as root while the executing file has changed hashes repeatedly. The incident owner wants a corroborating check and a protective action before recovery begins. Which TWO choices fit these separate tasks? (Choose TWO.)
- Disable the offending cron entry and prevent outbound payload retrieval
- Rebuild the trusted scheduled-job baseline and check root access paths
- Restrict service creation and monitor changes to boot-time execution paths
- Audit privileged cron modifications and restrict write access to job directories
- Review cron entries, file histories and spawned command lines
Explanation
Correct Answers
A:Blocking the trigger interrupts periodic reinfection; within the combined response for why signature-only cleanup fails, this supplies initial containment or preservation: the immediate response addresses why signature-only cleanup fails while the team preserves relevant case records.
E:The scheduled execution pattern remains stable even when payload bytes rotate; within the combined response for why signature-only cleanup fails, this supplies evidence validation: the objective is to establish why signature-only cleanup fails; the result can then guide the later protective decision.
Incorrect Answers
B:Cleaning mutable files without fixing scheduler or privileges is insufficient; for why signature-only cleanup fails, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
C:Baseline enforcement exposes stealthy persistence modifications; that method could help with whether startup configuration will reinfect the system; the initial containment or preservation decision here involves why signature-only cleanup fails.
D:Change monitoring targets persistence rather than static hashes; the goal is initial containment or preservation for why signature-only cleanup fails. Prevention cannot replace immediate action.
Question 308
A long-term control assessment uses this recent event: A trojan uses a compromised service account to read databases after its file is deleted. Which change provides measurable prevention rather than an emergency workaround?
- Inspect service-account tokens, credential use and database audit logs
- Revoke active tokens and restrict the account while retaining audit logs
- Limit local proxy changes and monitor certificate trust-store modifications
- Rotate affected secrets and restore least-privilege account permissions
- Use managed identities where possible and monitor anomalous service-account use
Explanation
Correct Answer
E:Reducing reusable secrets lowers credential replay risk; it closes a repeatable gap revealed by which access path remains dangerous without removing useful monitoring.
Incorrect Answers
A:File deletion does not invalidate previously stolen credentials or sessions; when judging which access path remains dangerous, an investigation is not recurrence prevention; this is instead evidence validation.
B:Identity containment stops continued database access; for which access path remains dangerous, one-time protection is not durable prevention; recurrence prevention remains necessary.
C:Configuration integrity blocks a less visible malware persistence route; this serves whether a configuration-based interception remains active, whereas the requested result is recurrence prevention involving which access path remains dangerous.
D:Changing the credential closes the persistent unauthorized access path; the goal is recurrence prevention for which access path remains dangerous. Case recovery is not future-risk control.
Question 309
The affected workflow needs an integrity and access check following this event: Multiple staff reuse local administrator passwords across laptops infected by a credential stealer. What case-specific cleanup or recovery step establishes a trusted state?
- Rotate affected local passwords and verify no unauthorized sessions remain
- Compare local administrator credential reuse and lateral authentication logs
- Use unique managed local administrator passwords with least privilege
- Tune specific false positives and verify legitimate build tasks still work
- Restrict exposed administrative access and isolate endpoints using the same credentials
Explanation
Correct Answer
A:Credential renewal removes the reusable access route; the change should be tested before unrestricted operations resume for the event involving why one infected device can lead to many endpoint logins.
Incorrect Answers
B:Shared secrets can turn a single theft into broad access; for why one infected device can lead to many endpoint logins, verification is not the corrective step; trusted restoration remains necessary.
C:Non-reusable local secrets contain compromise impact; the requirement concerns why one infected device can lead to many endpoint logins, so future hardening is not current-state recovery.
D:Precise policies improve both protection and availability; this serves whether broad exclusions hide malware execution, whereas the requested result is trusted restoration involving why one infected device can lead to many endpoint logins.
E:The attacker should not retain easy access to parallel machines; temporary protection does not complete correction in the decision about why one infected device can lead to many endpoint logins.
Question 310
Cleanup is not considered complete. The case record describes: An endpoint's network isolation is reversed automatically by an unapproved management script. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Suspend the conflicting automation and apply an authorized network quarantine
- Test incident overrides against routine endpoint management jobs
- Correct automation ownership and verify containment survives a policy cycle
- Scan and rebuild affected endpoints and sanitize or retire contaminated media
Explanation
Correct Answer
C:Durable remediation requires fixing the conflicting control; technical closure should demonstrate that the control gap behind why malware containment does not persist is actually corrected.
Incorrect Answers
A:Isolation must remain effective while active compromise is investigated; the case needs trusted restoration addressing why malware containment does not persist; temporary protection does not complete correction.
B:Runbook integration prevents accidental de-isolation; when judging why malware containment does not persist, future hardening is not current-state recovery; this is instead recurrence prevention.
D:Cleanup must cover both endpoints and the transport vehicle; that method could help with whether removable media caused repeated reinfections; the trusted restoration decision here involves why malware containment does not persist.