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| Section | Objectives |
|---|---|
| Topic 1: Threat Intelligence and Cyber Threat Analysis | - Threat intelligence lifecycle
|
| Topic 2: Incident Detection and Response | - SIEM operations
|
| Topic 3: Security Operations and SOC Fundamentals | - Log management and analysis
|
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質問 # 151
A security analyst in a multinational corporation's Threat Intelligence team is tasked with enhancing detection of stealthy malware infections. During an investigation, the analyst observes an unusually high volume of DNS requests directed toward domains that follow patterns commonly associated with Domain Generation Algorithms (DGAs). Recognizing that these automated domain queries could indicate malware attempting to establish communication with command-and-control (C2) infrastructure, the analyst realizes existing detection may be insufficient. The security team needs to define intelligence requirements, including identifying critical data sources, refining detection criteria, and improving monitoring strategies. Which stage of the Cyber Threat Intelligence (CTI) process does this align with?
正解：C
解説：
This scenario aligns with requirement analysis because the team is defining what intelligence is needed and how it should be collected and used. The analyst has observed a problem (possible DGA-based malware activity) and recognizes gaps in current detection. The next step in a CTI lifecycle is to translate that concern into actionable intelligence requirements: which telemetry sources are necessary (DNS logs, proxy logs, endpoint telemetry, threat intel on DGA families), what questions must be answered (which hosts, what domains, what patterns, what time windows), and what success criteria look like (detection thresholds, false positive tolerance, enrichment needs). This is the "direction" phase of CTI, where priorities are set and collection needs are specified to ensure intelligence efforts align to threats that matter. "Filtering CTI" would be about reducing noise in collected intelligence or refining feeds after collection. "Intelligence buy-in" is stakeholder alignment and program support, not the analytic definition of requirements. "Automated tool" is not a CTI lifecycle stage. From a SOC perspective, requirement analysis is critical to turn observations into structured detection and hunting objectives that can be measured and improved.
質問 # 152
TechSolutions, a software development firm, discovered a potential data leak after an external security researcher reported finding sensitive customer data on a public code repository. Level 1 SOC analysts confirmed the presence of the data and escalated the issue. Level 2 analysts traced the source of the leak to an internal network account. The incident response team has been alerted, and the CISO demands a comprehensive analysis of the incident, including the extent of the data breach and the timeline of events. The SOC manager must decide whom to assign to the in-depth investigation. To accurately determine the timeline, extent, and root cause of the data leak, which SOC role is critical in gathering and analyzing digital evidence?
正解：A
解説：
A forensic analyst is the role best suited to perform in-depth evidence gathering and analysis required to reconstruct timelines, determine scope, and establish root cause for a data leak. This work includes preserving evidence (ensuring integrity), collecting endpoint and server artifacts, reviewing authentication and repository access logs, correlating commit history with identity and device telemetry, and building a defensible chain of events for leadership and potential legal/regulatory review. The SOC manager coordinates resources and priorities but typically does not perform hands-on forensic reconstruction. A subject matter expert may provide domain expertise (e.g., on Git workflows, cloud platforms, or database systems), but forensic rigor and evidence handling are the core requirement here. A threat intelligence analyst focuses on external adversary information, campaigns, and indicators; they can assist with context but are not the primary role for internal evidence reconstruction. Because the CISO needs timeline, extent, and root cause-deliverables that depend on digital evidence handling and forensic methodology-the forensic analyst is the critical assignment.
質問 # 153
Jackson & Co., a mid-sized law firm, is concerned about web-based cyber threats. The IT team implements a solution that serves as an intermediary for all HTTP and HTTPS requests. This allows the SOC to inspect, filter, and control web traffic to detect and block malicious websites, phishing attempts, and other online threats before they reach users. Which containment method is the organization using to gain visibility and control over web traffic?
正解：A
解説：
A proxy server acts as an intermediary between users and the internet, routing HTTP/HTTPS requests through a controlled inspection point. This provides visibility (who accessed what, when, from which device) and enables enforcement (block categories, block malicious destinations, inspect headers, apply SSL/TLS inspection where permitted, and enforce acceptable-use policies). While web content filtering is often a feature implemented through proxies or secure web gateways, the question explicitly describes an
"intermediary for all HTTP and HTTPS requests," which is the defining characteristic of a proxy.
Whitelisting and blacklisting are policy methods (allow/deny lists) that can be applied within a proxy or firewall, but they are not the architectural containment method described. From a SOC containment standpoint, proxying enables rapid response actions: block newly observed malicious domains/URLs, monitor for beaconing, and prevent users from reaching phishing infrastructure. It also supports investigations by providing centralized web activity logs for correlation with endpoint and identity telemetry. Therefore, the correct option is proxy servers.
質問 # 154
Which of the following attack inundates DHCP servers with fake DHCP requests to exhaust all available IP addresses?
正解：B
質問 # 155
Which of the following command is used to enable logging in iptables?
正解：C
解説：
質問 # 156
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