Question 1140
Active first response is underway for the following condition: An endpoint reports repeated failed logons followed by one successful privileged login from an unfamiliar process. What is the most appropriate short-term restriction or first-response decision?
- Revoke unauthorized remote sessions and isolate the affected host
- Reset compromised credentials and review all privileged changes
- Revoke the questionable session and restrict the affected account
- Correlate logon success, process origin and subsequent privileged actions
Explanation
Correct Answer
C:Identity containment limits use of the newly gained access; it protects the affected workflow while investigators continue resolving whether password guessing became successful access.
Incorrect Answers
A:Access-path containment is essential beyond blocking one file; the other incident centers on whether a remote-management tool was abused, not this initial containment or preservation question about whether password guessing became successful access.
B:Restoration requires checking what happened after login; the goal is initial containment or preservation for whether password guessing became successful access. Corrective follow-through follows initial protection.
D:A successful authentication after failures can signal an active compromise; the case needs initial containment or preservation addressing whether password guessing became successful access; investigation alone does not control current conditions.
Question 1141
The coordinator needs corrective action rather than another alert. The event was: A response team has no tested way to isolate Macs because its EDR isolation instructions cover only Windows. Which follow-through step verifies the weakness was removed?
- Maintain OS-specific responder guides and version compatibility checks
- Apply an approved network-level quarantine for uncovered endpoints
- Test platform-specific isolation and acquisition on representative Macs
- Record device loss, assess local encryption and rotate relevant credentials
Explanation
Correct Answer
C:Preparation should verify tool behavior on each supported OS; the recovery decision is tied to whether endpoint playbooks cover deployed operating systems, not merely to reduced alert volume.
Incorrect Answers
A:Cross-platform readiness reduces operational delay; when judging whether endpoint playbooks cover deployed operating systems, future hardening is not current-state recovery; this is instead recurrence prevention.
B:Alternative containment should not depend on a nonexistent host action; for whether endpoint playbooks cover deployed operating systems, temporary protection does not complete correction; trusted restoration remains necessary.
D:Recovery addresses information risk beyond physical hardware; the activity targets whether mobile device management can contain loss; trusted restoration here concerns whether endpoint playbooks cover deployed operating systems.
Question 1142
Before making any disruptive change, an investigator is handed these observations: An employee laptop reports hundreds of file-renaming operations and rapid changes to document entropy. Which source best supports the incident finding before responders modify the environment?
- Use controlled-folder protections and immutable backup copies
- Suspend the responsible process and isolate the laptop from file shares
- Compare driver load, security-agent crash and administrative action timestamps
- Correlate file-modification bursts with originating process and user account
- Rebuild the endpoint and restore affected files from validated backups
Explanation
Correct Answer
D:Bulk rewrites and entropy shifts are consistent with encryption activity; for this investigation, the relevant uncertainty is whether ransomware encryption has begun, so independent confirmation matters.
Incorrect Answers
A:Write restrictions and protected recovery points reduce impact; the case needs evidence validation addressing whether ransomware encryption has begun; prevention is not incident verification.
B:Stopping writes limits immediate file damage and propagation; when judging whether ransomware encryption has begun, immediate protection does not substantiate findings; this is instead initial containment or preservation.
C:The close sequence may indicate an intentional driver-based evasion attempt; that method could help with whether kernel-level changes caused endpoint sensor loss; the evidence validation decision here involves whether ransomware encryption has begun.
E:Reliable recovery avoids trusting altered local content; the goal is evidence validation for whether ransomware encryption has begun. Recovery is not factual verification.
Question 1143
An evidence-led review starts with the following report: A privileged user installs an unsigned kernel extension and endpoint monitoring stops reporting immediately afterward. What investigation should establish the disputed activity and its timeline?
- Restrict driver installation and monitor kernel integrity changes
- Apply independent network quarantine if host-based controls are unreliable
- Compare driver load, security-agent crash and administrative action timestamps
- Correlate remote session identity, process tree and execution time
Explanation
Correct Answer
C:The close sequence may indicate an intentional driver-based evasion attempt; it makes the determination of whether kernel-level changes caused endpoint sensor loss defensible and reviewable by the incident owner.
Incorrect Answers
A:Lower privilege and visibility reduce tampering opportunities; when judging whether kernel-level changes caused endpoint sensor loss, prevention is not incident verification; this is instead recurrence prevention.
B:An untrusted endpoint agent may be unable to enforce isolation; for whether kernel-level changes caused endpoint sensor loss, immediate protection does not substantiate findings; evidence validation remains necessary.
D:A legitimate support binary can still start attacker-controlled commands; the other incident centers on whether a remote-management tool was abused, not this evidence validation question about whether kernel-level changes caused endpoint sensor loss.
Question 1144
The responder must establish the timeline from this observation: A retail branch uses unmanaged point-of-sale terminals with no inventory or device-level response contacts. Which analysis step best addresses the missing confirmation?
- Reconcile branch asset lists, software support and management ownership
- Inspect last agent heartbeat, definition updates and local event buffer
- Maintain endpoint inventory and risk-based monitoring for business appliances
- Establish a named terminal owner and restrict suspect transaction paths
Explanation
Correct Answer
A:Untracked terminals hinder coordinated detection and vendor-assisted restoration; it connects the question of whether endpoint scope includes specialized business devices to an observable record and a reproducible check.
Incorrect Answers
B:Offline operation can create long monitoring and protection gaps; this serves whether intermittent devices retain protective coverage, whereas the requested result is evidence validation involving whether endpoint scope includes specialized business devices.
C:Visibility makes incident preparation possible; for whether endpoint scope includes specialized business devices, prevention is not incident verification; evidence validation remains necessary.
D:Controlled response limits possible fraud without improvising against payment infrastructure; the requirement concerns whether endpoint scope includes specialized business devices, so immediate protection does not substantiate findings.
Question 1145
The team requires traceable proof for an event described as follows: A mobile device enrolled for company access has developer debugging enabled and is connected to an untrusted kiosk. What should be correlated to determine whether the case finding is justified?
- Inspect debugging state, trusted host authorizations and USB connection history
- Disable debugging and sever trust with the unapproved host
- Check MDM check-in status, disk encryption and recent mail sessions
- Enforce managed developer-setting restrictions on high-risk devices
Explanation
Correct Answer
A:An authorized debug bridge can expose device data or command control; the objective is to establish whether debugging exposes the managed device; the result can then guide the later protective decision.
Incorrect Answers
B:Containment closes a physical access channel; for whether debugging exposes the managed device, immediate protection does not substantiate findings; evidence validation remains necessary.
C:Remote management and account logs reveal remaining access risk; the relevant condition for that step is whether a lost mobile device can access enterprise mail, which is not shown for whether debugging exposes the managed device.
D:Policy limits unauthorized debugging connections; the goal is evidence validation for whether debugging exposes the managed device. Prevention is not incident verification.
Question 1146
The team needs temporary protection and must retain evidence. The observed event is: A mobile phishing page successfully captures a corporate sign-in and the attacker maintains an active cloud session. What narrowly scoped action would best control the immediate risk?
- Issue an authorized remote lock or wipe as policy permits and revoke sessions
- Reset credentials and examine affected SaaS application grants
- Use phishing-resistant MFA and mobile threat protection
- Correlate mobile browser events with identity provider sign-in and token activity
- Revoke the account's suspicious sessions and block the lure
Explanation
Correct Answer
E:Cloud-side identity containment can work even if the phone is offline; the immediate response addresses whether mobile-origin credentials were used elsewhere while the team preserves relevant case records.
Incorrect Answers
A:Identity and device controls complement each other for offline devices; the activity targets whether a lost mobile device can access enterprise mail; initial containment or preservation here concerns whether mobile-origin credentials were used elsewhere.
B:The risk extends to applications accessible through the stolen session; the case needs initial containment or preservation addressing whether mobile-origin credentials were used elsewhere; corrective follow-through follows initial protection.
C:Origin-bound authentication reduces mobile phishing impact; when judging whether mobile-origin credentials were used elsewhere, prevention cannot replace immediate action; this is instead recurrence prevention.
D:The compromised credential may have been replayed from a different device; for whether mobile-origin credentials were used elsewhere, investigation alone does not control current conditions; initial containment or preservation remains necessary.
Question 1147
The initial scene or threat protection decision concerns the following: A field workstation is disconnected from the corporate network for weeks, so its EDR agent receives no policies or updates. How should responders limit the damage while retaining the investigation trail?
- Update security policy, replay local telemetry and validate endpoint health
- Restrict the suspect device's access to corporate resources
- Limit access to high-value services until the device synchronizes and is assessed
- Inspect last agent heartbeat, definition updates and local event buffer
Explanation
Correct Answer
C:A trust gate prevents stale endpoints from rejoining blindly; the protective decision should be recorded and its effect tested against whether intermittent devices retain protective coverage.
Incorrect Answers
A:Recovery confirms the returning device has a trusted security state; for whether intermittent devices retain protective coverage, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
B:Endpoint containment stops further use of exposed sessions; the relevant condition for that step is whether endpoints can bypass server-centric protection, which is not shown for whether intermittent devices retain protective coverage.
D:Offline operation can create long monitoring and protection gaps; investigation alone does not control current conditions in the decision about whether intermittent devices retain protective coverage.
Question 1148
A triage analyst needs to test a report involving these details: A SCADA historian stops receiving data after a new firewall block was installed during a suspected intrusion. Which evidence collection or correlation is most relevant to this claim?
- Adjust the rule with OT owner approval to preserve required read-only flows
- Correlate firewall drops, historian flows and controller communications
- Document essential OT data flows and rehearse containment ACLs
- Correlate HMI commands, controller events and process telemetry with OT operators
Explanation
Correct Answer
B:The emergency rule may have blocked legitimate telemetry rather than attacker control; it connects the question of whether containment interrupted process monitoring to an observable record and a reproducible check.
Incorrect Answers
A:Narrow enforcement can limit malicious traffic without blinding operators; the goal is evidence validation for whether containment interrupted process monitoring. Immediate protection does not substantiate findings.
C:Prevalidated rules reduce accidental outages; the case needs evidence validation addressing whether containment interrupted process monitoring; prevention is not incident verification.
D:Cyber observations must be interpreted against real equipment conditions; that method could help with whether physical process safety is at risk; the evidence validation decision here involves whether containment interrupted process monitoring.
Question 1149
A post-incident audit examines the following failure mode: An organization treats a mobile device alert as irrelevant because all central servers are fully patched. What recurring check or restriction would best address the weakness?
- Include managed mobile clients in detection and response coverage
- Maintain endpoint inventory and risk-based monitoring for business appliances
- Restrict the suspect device's access to corporate resources
- Map device identity, installed apps and data access from the alerted mobile client
- Revalidate device trust and account sessions before restoring application access
Explanation
Correct Answer
A:Protection must follow enterprise data to endpoints; this turns the weakness behind whether endpoints can bypass server-centric protection into a measurable prevention requirement.
Incorrect Answers
B:Visibility makes incident preparation possible; the activity targets whether endpoint scope includes specialized business devices; recurrence prevention here concerns whether endpoints can bypass server-centric protection.
C:Endpoint containment stops further use of exposed sessions; the goal is recurrence prevention for whether endpoints can bypass server-centric protection. One-time protection is not durable prevention.
D:Compromised endpoints can expose cloud sessions and enterprise data without compromising servers; an investigation is not recurrence prevention in the decision about whether endpoints can bypass server-centric protection.
E:Recovery must include client integrity and identity state; the case needs recurrence prevention addressing whether endpoints can bypass server-centric protection; case recovery is not future-risk control.
Question 1150
Before making any disruptive change, an investigator is handed these observations: Hundreds of identical smart meters share the same embedded administrative secret. Which source best supports the incident finding before responders modify the environment?
- Inventory firmware identities and validate the shared credential design
- Restrict administrative network reachability while planning credential changes
- Require per-device credentials and secure provisioning contracts
- Compare firmware version and signature with vendor release records and flow logs
Explanation
Correct Answer
A:One leaked secret could enable access to many devices; for this investigation, the relevant uncertainty is whether common embedded credentials amplify compromise, so independent confirmation matters.
Incorrect Answers
B:Segment-level containment reduces fleet-wide abuse; when judging whether common embedded credentials amplify compromise, immediate protection does not substantiate findings; this is instead initial containment or preservation.
C:Fleet identity design prevents single-secret compromise; for whether common embedded credentials amplify compromise, prevention is not incident verification; evidence validation remains necessary.
D:An unexpected firmware build can change device behavior and external communication; this serves whether firmware integrity or destination was altered, whereas the requested result is evidence validation involving whether common embedded credentials amplify compromise.