Question 1130
The immediate risk must be managed. The response record describes: An OT network sees new programming commands to a PLC from a workstation that normally only displays status. The first response plan must document the reported condition AND limit near-term harm. Select TWO case-specific steps. (Choose TWO.)
- Verify PLC logic against approved baseline and validate process behavior
- Restrict engineering protocol writes from the suspect station under OT change control
- Compare PLC programming audit, source identity and authorized engineering schedule
- Allowlist engineering workstations and monitor PLC program changes
- Use change approval, role segregation and process anomaly detection
Explanation
Correct Answers
B:Write-path containment protects controller logic while preserving monitoring; within the combined response for whether a nonengineering station initiated controller changes, this supplies initial containment or preservation: the scope of this restriction follows whether a nonengineering station initiated controller changes rather than indiscriminately changing unrelated assets.
C:Command type and workstation role help identify unauthorized modification; within the combined response for whether a nonengineering station initiated controller changes, this supplies evidence validation: it connects the question of whether a nonengineering station initiated controller changes to an observable record and a reproducible check.
Incorrect Answers
A:Recovery requires safe controller state confirmation; when judging whether a nonengineering station initiated controller changes, corrective follow-through follows initial protection; this is instead trusted restoration.
D:Separated roles reduce unauthorized logic updates; the goal is initial containment or preservation for whether a nonengineering station initiated controller changes. Prevention cannot replace immediate action.
E:Safety-aware controls detect unauthorized setpoint modifications; this serves whether physical process safety is at risk, whereas the requested result is initial containment or preservation involving whether a nonengineering station initiated controller changes.
Question 1131
A control owner is preparing preventive actions after observing: A privileged user installs an unsigned kernel extension and endpoint monitoring stops reporting immediately afterward. What tested hardening or process measure follows from the lessons learned?
- Rebuild the endpoint, re-enroll EDR and verify kernel-extension controls and telemetry
- Detect failed-to-successful login sequences and enforce MFA
- Compare driver load, security-agent crash and administrative action timestamps
- Restrict driver installation and monitor kernel integrity changes
Explanation
Correct Answer
D:Lower privilege and visibility reduce tampering opportunities; a periodic review of this safeguard can track the risk described by whether kernel-level changes caused endpoint sensor loss.
Incorrect Answers
A:Restoring agent trust and tested kernel controls validates monitoring after the unauthorized extension is removed; when judging whether kernel-level changes caused endpoint sensor loss, case recovery is not future-risk control; this is instead trusted restoration.
B:Contextual authentication analytics improves detection; the other incident centers on whether password guessing became successful access, not this recurrence prevention question about whether kernel-level changes caused endpoint sensor loss.
C:The close sequence may indicate an intentional driver-based evasion attempt; the requirement concerns whether kernel-level changes caused endpoint sensor loss, so an investigation is not recurrence prevention.
Question 1132
A post-incident audit examines the following failure mode: A SCADA historian stops receiving data after a new firewall block was installed during a suspected intrusion. What recurring check or restriction would best address the weakness?
- Allowlist engineering workstations and monitor PLC program changes
- Validate historian ingestion and independent process alarm visibility
- Document essential OT data flows and rehearse containment ACLs
- Correlate firewall drops, historian flows and controller communications
Explanation
Correct Answer
C:Prevalidated rules reduce accidental outages; the control owner can test whether this reduces repeat conditions affecting whether containment interrupted process monitoring.
Incorrect Answers
A:Separated roles reduce unauthorized logic updates; that method could help with whether a nonengineering station initiated controller changes; the recurrence prevention decision here involves whether containment interrupted process monitoring.
B:Recovery should confirm trustworthy monitoring has resumed; the requirement concerns whether containment interrupted process monitoring, so case recovery is not future-risk control.
D:The emergency rule may have blocked legitimate telemetry rather than attacker control; an investigation is not recurrence prevention in the decision about whether containment interrupted process monitoring.
Question 1133
Service owners need a bounded short-term safeguard after observing: A user's laptop is sending rare-domain DNS queries but endpoint security shows no malware detection. Investigators need both a defensible factual finding and a limited immediate safeguard. Which TWO actions jointly satisfy those requirements? (Choose TWO.)
- Analyze the artifact and remove persistence if compromise is confirmed
- Join DNS events with process command line and installed extension activity
- Enable DNS and endpoint behavioral correlation
- Investigate the responsible process and clean or rebuild as findings require
- Apply controlled outbound isolation and capture volatile endpoint state
- Rebuild the endpoint and restore affected files from validated backups
Explanation
Correct Answers
B:Behavioral evidence can reveal threats that static signatures miss; within the combined response for whether a negative signature alert rules out compromise, this supplies evidence validation: it makes the determination of whether a negative signature alert rules out compromise defensible and reviewable by the incident owner.
E:Caution is warranted when an active channel may exist; within the combined response for whether a negative signature alert rules out compromise, this supplies initial containment or preservation: this is a first-response safeguard for whether a negative signature alert rules out compromise, not a substitute for full root-cause analysis.
Incorrect Answers
A:A defensible outcome follows evidence rather than filename alone; this serves what corroborates suspicious endpoint execution, whereas the requested result is initial containment or preservation involving whether a negative signature alert rules out compromise.
C:Layered telemetry covers gaps in signature detections; the goal is initial containment or preservation for whether a negative signature alert rules out compromise. Prevention cannot replace immediate action.
D:Response follows the observed execution mechanism; corrective follow-through follows initial protection in the decision about whether a negative signature alert rules out compromise.
F:Reliable recovery avoids trusting altered local content; it is meant to address whether ransomware encryption has begun, not initial containment or preservation for whether a negative signature alert rules out compromise.
Question 1134
The response record begins with an unresolved observation: An industrial HMI shows unauthorized setpoint changes while the process is operating near a safety threshold. What documentation or telemetry would most reliably support the incident determination?
- Follow site safety procedures and coordinate any network isolation with control engineers
- Use change approval, role segregation and process anomaly detection
- Compare PLC programming audit, source identity and authorized engineering schedule
- Correlate HMI commands, controller events and process telemetry with OT operators
Explanation
Correct Answer
D:Cyber observations must be interpreted against real equipment conditions; this evidence is scoped to whether physical process safety is at risk, not a generic system-health reading.
Incorrect Answers
A:Unplanned shutdown can create greater physical danger; the requirement concerns whether physical process safety is at risk, so immediate protection does not substantiate findings.
B:Safety-aware controls detect unauthorized setpoint modifications; the goal is evidence validation for whether physical process safety is at risk. Prevention is not incident verification.
C:Command type and workstation role help identify unauthorized modification; that method could help with whether a nonengineering station initiated controller changes; the evidence validation decision here involves whether physical process safety is at risk.
Question 1135
A responder is tasked with limiting immediate impact after this report: An industrial controller vendor prohibits untested security agents, but the SOC intends to install a standard endpoint scanner during an incident. Which immediate safeguard protects the case while later remediation is planned?
- Confirm vendor support, process dependencies and authorized maintenance procedures
- Use passive telemetry and coordinate containment with OT engineers
- Prioritize export of security-critical events to central storage
- Maintain OT-specific tool approvals and isolated test environments
- Collect evidence through vendor-approved interfaces and validate control functionality
Explanation
Correct Answer
B:Safety and operational continuity govern intervention choices; the protective decision should be recorded and its effect tested against whether the equipment vendor approves the proposed scanner for this controller.
Incorrect Answers
A:Unvalidated software can disrupt controllers and physical operations; the goal is initial containment or preservation for whether the equipment vendor approves the proposed scanner for this controller. Investigation alone does not control current conditions.
C:Protected off-device logs survive local overwrite; the activity targets whether security telemetry capacity is adequate; initial containment or preservation here concerns whether the equipment vendor approves the proposed scanner for this controller.
D:Preparation avoids dangerous production experiments; when judging whether the equipment vendor approves the proposed scanner for this controller, prevention cannot replace immediate action; this is instead recurrence prevention.
E:Supported methods preserve reliability while investigating; for whether the equipment vendor approves the proposed scanner for this controller, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
Question 1136
The responder must establish the timeline from this observation: A network camera still uses a default administrator password and exposes its control interface to the internet. Which analysis step best addresses the missing confirmation?
- Inspect listening services, authentication records and asset configuration
- Enforce unique device credentials and isolated management networks
- Review camera authentication logs, firmware and management interface exposure
- Block external management access and change the compromised password
Explanation
Correct Answer
C:Default credentials plus public reachability create a straightforward entry path; the review should retain source and timing information relevant to whether weak device identity enabled unauthorized access.
Incorrect Answers
A:An unused plaintext management protocol increases attack surface; that method could help with whether an unnecessary remote service exposes device control; the evidence validation decision here involves whether weak device identity enabled unauthorized access.
B:IoT devices should not depend on factory defaults; when judging whether weak device identity enabled unauthorized access, prevention is not incident verification; this is instead recurrence prevention.
D:Immediate restrictions limit remote control; the requirement concerns whether weak device identity enabled unauthorized access, so immediate protection does not substantiate findings.
Question 1137
To avoid broad unnecessary disruption, responders consider this finding: A smart thermostat gateway sends traffic to an unknown cloud endpoint after an unapproved firmware update. Which operational control should take effect first?
- Filter unauthorized management traffic at the segment boundary
- Restore vendor-verified firmware and validate operating parameters
- Require signed firmware and approved update management for IoT assets
- Restrict the gateway's outbound paths without interrupting essential building control
- Compare firmware version and signature with vendor release records and flow logs
Explanation
Correct Answer
D:Network containment protects safety and availability; the action limits the impact connected to whether firmware integrity or destination was altered without assuming the underlying flaw is already gone.
Incorrect Answers
A:Containment avoids repeatedly rebooting the gateway as the only response; the activity targets whether malicious management requests cause availability loss; initial containment or preservation here concerns whether firmware integrity or destination was altered.
B:Recovery should use supported update mechanisms; corrective follow-through follows initial protection in the decision about whether firmware integrity or destination was altered.
C:Firmware provenance reduces supply-chain and unauthorized changes; the case needs initial containment or preservation addressing whether firmware integrity or destination was altered; prevention cannot replace immediate action.
E:An unexpected firmware build can change device behavior and external communication; for whether firmware integrity or destination was altered, investigation alone does not control current conditions; initial containment or preservation remains necessary.
Question 1138
The team wants a measurable hardening change following this situation: Endpoint event logs are overwritten after a few hours because an application generates noisy debug events. What improvement best addresses the root weakness in a future incident?
- Include event-retention performance tests in endpoint baselines
- Tune debug verbosity and verify investigation events remain available
- Maintain OT-specific tool approvals and isolated test environments
- Measure event volume, retention settings and off-host forwarding latency
Explanation
Correct Answer
A:Capacity planning improves forensic readiness; a periodic review of this safeguard can track the risk described by whether security telemetry capacity is adequate.
Incorrect Answers
B:A balanced configuration preserves high-value evidence; the goal is recurrence prevention for whether security telemetry capacity is adequate. Case recovery is not future-risk control.
C:Preparation avoids dangerous production experiments; it is meant to address whether the equipment vendor approves the proposed scanner for this controller, not recurrence prevention for whether security telemetry capacity is adequate.
D:Noisy logs can crowd out security events before collection; the case needs recurrence prevention addressing whether security telemetry capacity is adequate; an investigation is not recurrence prevention.
Question 1139
An evidence-led review starts with the following report: A tablet fleet has no procedure to issue supervised remote locks after devices are reported stolen. What investigation should establish the disputed activity and its timeline?
- Review MDM enrollment, last check-in and available lock commands
- Enforce managed enrollment, encryption and loss-response testing
- Compare fleet OS inventory with available isolation tooling and privileges
- Issue an authorized lock and revoke exposed account sessions
Explanation
Correct Answer
A:Device management capabilities depend on enrollment and connectivity; this permits a traceable finding about whether mobile device management can contain loss before the team makes a disruptive change.
Incorrect Answers
B:Prepared controls reduce loss impact; for whether mobile device management can contain loss, prevention is not incident verification; evidence validation remains necessary.
C:Unsupported instructions can fail on a material part of the device estate; the relevant condition for that step is whether endpoint playbooks cover deployed operating systems, which is not shown for whether mobile device management can contain loss.
D:Identity revocation is important even if the offline device cannot receive a command; the goal is evidence validation for whether mobile device management can contain loss. Immediate protection does not substantiate findings.
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.