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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Security Operations | 34% | - Security Monitoring and Analysis
|
| Topic 2: Vulnerability Management | 26% | - Vulnerability Assessment and Remediation
|
| Topic 3: Incident Response and Management | 24% | - Incident Handling and Investigation
|
| Topic 4: Reporting and Communication | 16% | - Documentation and Stakeholder Communication
|
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質問 # 56
An analyst prepares an after action report following an incident in which multiple systems were compromised over several days.
The analyst provides raw event logs from each compromised system in the report and determines that a patient-zero system cannot be found.
Which of the following should the analyst do to determine the patient-zero system?
正解：B
解説：
The analyst must construct an accurate incident timeline . Patient zero is the earliest compromised system from which subsequent malicious activity originated or propagated. Determining it requires ordering events chronologically across all affected hosts and correlating authentication activity, process execution, network connections, malware creation times, lateral movement, and other evidence.
Raw logs alone do not communicate this sequence effectively. Logs from different systems must first use reliable timestamps and then be normalized and correlated. Once events are ordered, the analyst can work backward from known compromises to determine which host displayed the earliest credible signs of intrusion and whether subsequent systems were reached from that host.
Enabling additional monitoring helps detect future activity but does not reconstruct historical sequence by itself. Isolation is necessary during containment but does not establish which system was initially compromised. Shift-handoff improvements are useful organizationally but do not answer the forensic question. Malware composition analysis may identify relationships between samples, but it does not establish system-level chronology.
NIST's incident-response guidance emphasizes analysis, documentation, root-cause understanding, and after- action reporting as inputs to continuous improvement.
Study Guide Reference: Incident Response and Management # Timeline Analysis # Event Correlation # Patient Zero # Root Cause Analysis # After-Action Review.
質問 # 57
Multiple users report unexpected mouse movements and terminal windows opening. An analyst reviewing the network traffic logs observes the following:
Which of the following is the most likely reason for the reported symptoms?
正解：C
解説：
TCP port 5900 is the standard port for VNC, which provides interactive remote control of a system's desktop, including mouse movement and opening terminal windows.
質問 # 58
Which of the following is the most difficult for threat actors to change according to the Pyramid of Pain model?
正解：D
解説：
TTPs reflect an attacker's established behavior and operational methods, making them much harder to change than tools, domains, or IP addresses.
質問 # 59
Which of the following contains stakeholder contact information for incident response reporting?
正解：A
解説：
The communication plan is the appropriate document because it establishes who must be contacted during an incident, how communications should occur, which channels are authorized, and how information should be escalated to internal and external stakeholders.
Incident-response communications may involve security personnel, executive leadership, legal counsel, privacy teams, public relations, human resources, business owners, vendors, regulators, law enforcement, customers, and other parties depending on incident severity. NIST's incident-response guidance emphasizes coordination with relevant stakeholders as part of an effective response capability. A communication plan operationalizes that requirement by maintaining contact information, responsibilities, escalation paths, notification requirements, and approved communication methods.
An organization chart identifies reporting relationships but may not contain emergency contact details, alternate channels, external contacts, or escalation procedures. A previous incident report documents a historical event and should not be treated as the authoritative contact source. Standard operating procedures can describe technical or administrative steps, but stakeholder communications are more appropriately centralized in the incident communication plan.
Maintaining this information in advance is critical because incident response frequently occurs under time pressure and may involve unavailable or compromised normal communication systems.
Study Guide Reference: Reporting and Communication # Communication Plan # Stakeholder Contacts # Escalation Paths # Internal/External Notifications # Out-of-Band Communications.
質問 # 60
Customers are unable to upload files to an SFTP server. Firewall logs show the following activity sourced from multiple IP addresses in one geographic region:
The analyst reviewing the logs notices that the session_end_reason does not change for any of the log entries. Which of the following is the next step the analyst should take to determine what is occurring?
正解：B
解説：
The firewall log shows TCP traffic to port 22 is being allowed, but the sessions consistently end with an "aged-out/incomplete" status. This commonly indicates that the TCP three-way handshake is not completing. Capturing packets to determine whether the server is responding properly and whether clients are completing the handshake is the appropriate next step to identify where the connection process is failing.
質問 # 61
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