[2025年12月25日] 完全版最新の問題集でPDFで最新312-85試験問題と解答
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ECCouncil 312-85: Certified Threat Intelligence Analyst試験は、脅威インテリジェンス分析分野の専門家の知識とスキルを検証するグローバルに認められた資格です。この試験は、候補者がさまざまな情報源から情報を収集、分析、解釈し、組織のインフラストラクチャに対する脅威を特定し、軽減する能力をテストすることに焦点を当てています。
CTIA認証を提供する組織であるECCouncilは、サイバーセキュリティの教育やトレーニングプログラムの主要なプロバイダーです。CTIA認定試験は厳格で挑戦的ですが、候補者の専門知識や能力を測るための手段として、雇用者から高く評価されています。全体的に、CTIA認証は、急速に進化するサイバーセキュリティの分野で、サイバーセキュリティのプロフェッショナルが自分のスキルと知識を示し、キャリアを進めるための優れた方法です。
質問 # 21
Walter and Sons Company has faced major cyber attacks and lost confidential data. The company has decided to concentrate more on the security rather than other resources. Therefore, they hired Alice, a threat analyst, to perform data analysis. Alice was asked to perform qualitative data analysis to extract useful information from collected bulk data.
Which of the following techniques will help Alice to perform qualitative data analysis?
- A. Finding links between data and discover threat-related information
- B. Brainstorming, interviewing, SWOT analysis, Delphi technique, and so on
- C. Numerical calculations, statistical modeling, measurement, research, and so on.
- D. Regression analysis, variance analysis, and so on
正解：B
解説：
For Alice to perform qualitative data analysis, techniques such as brainstorming, interviewing, SWOT (Strengths, Weaknesses, Opportunities, Threats) analysis, and the Delphi technique are suitable. Unlike quantitative analysis, which involves numerical calculations and statistical modeling, qualitative analysis focuses on understanding patterns, themes, and narratives within the data. These techniques enable the analyst to explore the data's deeper meanings and insights, which are essential for strategic decision-making and developing a nuanced understanding of cybersecurity threats and vulnerabilities.
References:
"Qualitative Research Methods in Cybersecurity," SANS Institute Reading Room
"The Delphi Method for Cybersecurity Risk Assessment," by Cybersecurity and Infrastructure Security Agency (CISA)
質問 # 22
Cybersol Technologies initiated a cyber-threat intelligence program with a team of threat intelligence analysts. During the process, the analysts started converting the raw data into useful information by applying various techniques, such as machine-based techniques, and statistical methods.
In which of the following phases of the threat intelligence lifecycle is the threat intelligence team currently working?
- A. Dissemination and integration
- B. Planning and direction
- C. Analysis and production
- D. Processing and exploitation
正解：D
質問 # 23
As the CEO of a multinational corporation, you focus on making decisions that align with the organization's long-term goals and overall business strategies. What type of threat intelligence would be most valuable in guiding your decisions to enhance a company's resilience against emerging cyber threats?
- A. Tactical threat intelligence
- B. Technical threat intelligence
- C. Operational threat intelligence
- D. Strategic threat intelligence
正解：D
解説：
Strategic Threat Intelligence provides high-level insights into the overall threat landscape, long-term trends, and the potential impact of emerging cyber threats on business operations and strategy. It is primarily designed for executives, policymakers, and senior management to make informed decisions that align with organizational goals and risk tolerance.
This intelligence type translates complex technical data into business-relevant language, helping leadership understand:
* The motives and objectives of threat actors.
* The geopolitical or industry trends affecting cybersecurity risk.
* The overall security posture and areas requiring investment.
* How to allocate resources for long-term resilience and compliance.
Why the Other Options Are Incorrect:
* A. Operational Threat Intelligence:Focuses on ongoing campaigns and immediate threats relevant to security operations and incident response teams.
* B. Tactical Threat Intelligence:Deals with adversary Tactics, Techniques, and Procedures (TTPs) and is used by SOC and defense analysts for short-term defensive actions.
* D. Technical Threat Intelligence:Focuses on technical indicators such as IP addresses, hashes, and URLs, used for detection and blocking within security tools.
Conclusion:
For a CEO focusing on long-term strategic decisions and organizational resilience, the most valuable form of threat intelligence is Strategic Threat Intelligence.
Final Answer: C. Strategic Threat Intelligence
Explanation Reference (Based on CTIA Study Concepts):
As outlined in CTIA's section on Types of Threat Intelligence, strategic threat intelligence provides executive- level insights for planning and governance, supporting risk management and long-term decision-making.
質問 # 24
What term describes the trust establishment process, wherein the first organization relies on a body of evidence presented to the second organization, and the level of trust is contingent upon the degree and quality of evidence provided by the initiating organization?
- A. Direct historical trust
- B. Mandated trust
- C. Mediated trust
- D. Validated trust
正解：D
解説：
The scenario describes a trust establishment process where one organization bases its trust in another on the degree and quality of evidence that the second organization provides. This concept is known as Validated Trust.
Validated Trust is built through the verification and assessment of presented evidence such as certifications, security audits, compliance documentation, or past performance. The higher the credibility and quality of the evidence, the greater the level of trust established.
This type of trust is evidence-based, meaning it does not rely solely on previous interactions or third-party mediation but on verifiable proof provided directly between the entities involved.
Why the Other Options Are Incorrect:
* A. Mandated Trust:This is imposed by regulation, policy, or authority. It is not based on evidence but on obligation or requirement.
* B. Direct Historical Trust:This trust is formed from prior experiences and a consistent history of interactions between the entities. It does not depend on new evidence or documentation.
* D. Mediated Trust:This form of trust is established through an intermediary (such as a trusted third party or certificate authority) who vouches for the credibility of one organization to another.
Conclusion:
The process where trust is established based on the degree and quality of evidence provided by one party is known as Validated Trust.
Final Answer: C. Validated Trust
Explanation Reference (Based on CTIA Study Concepts):
According to the CTIA study topics under "Information Sharing and Trust Establishment," validated trust is the level of confidence gained through verification of tangible evidence, certifications, or attestations demonstrating security assurance and reliability.
質問 # 25
John, a professional hacker, is trying to perform APT attack on the target organization network. He gains access to a single system of a target organization and tries to obtain administrative login credentials to gain further access to the systems in the network using various techniques.
What phase of the advanced persistent threat lifecycle is John currently in?
- A. Persistence
- B. Initial intrusion
- C. Expansion
- D. Search and exfiltration
正解：C
解説：
The phase described where John, after gaining initial access, is attempting to obtain administrative credentials to further access systems within the network, is known as the 'Expansion' phase of an Advanced Persistent Threat (APT) lifecycle. This phase involves the attacker expanding their foothold within the target's environment, often by escalating privileges, compromising additional systems, and moving laterally through the network. The goal is to increase control over the network and maintain persistence for ongoing access.
This phase follows the initial intrusion and sets the stage for establishing long-term presence and eventual data exfiltration or other malicious objectives.
References:
MITRE ATT&CK Framework, specifically the tactics related to Credential Access and Lateral Movement
"APT Lifecycle: Detecting the Undetected," a whitepaper by CyberArk
質問 # 26
Daniel is a professional hacker whose aim is to attack a system to steal data and money for profit. He performs hacking to obtain confidential data such as social security numbers, personally identifiable information (PII) of an employee, and credit card information. After obtaining confidential data, he further sells the information on the black market to make money.
Daniel comes under which of the following types of threat actor.
- A. Industrial spies
- B. State-sponsored hackers
- C. Insider threat
- D. Organized hackers
正解：D
解説：
Daniel's activities align with those typically associated with organized hackers. Organized hackers or cybercriminals work in groups with the primary goal of financial gain through illegal activities such as stealing and selling data. These groups often target large amounts of data, including personal and financial information, which they can monetize by selling on the black market or dark web. Unlike industrial spies who focuson corporate espionage or state-sponsored hackers who are backed by nation-states for political or military objectives, organized hackers are motivated by profit. Insider threats, on the other hand, come from within the organization and might not always be motivated by financial gain. The actions described in the scenario-targeting personal and financial information for sale-best fit the modus operandi of organized cybercriminal groups.References:
* ENISA (European Union Agency for Cybersecurity) Threat Landscape Report
* Verizon Data Breach Investigations Report
質問 # 27
What is the correct sequence of steps involved in scheduling a threat intelligence program?
1. Review the project charter
2. Identify all deliverables
3. Identify the sequence of activities
4. Identify task dependencies
5. Develop the final schedule
6. Estimate duration of each activity
7. Identify and estimate resources for all activities
8. Define all activities
9. Build a work breakdown structure (WBS)
- A. 1-->9-->2-->8-->3-->7-->4-->6-->5
- B. 1-->2-->3-->4-->5-->6-->7-->8-->9
- C. 3-->4-->5-->2-->1-->9-->8-->7-->6
- D. 1-->2-->3-->4-->5-->6-->9-->8-->7
正解：A
解説：
The correct sequence for scheduling a threat intelligence program involves starting with the foundational steps of defining the project scope and objectives, followed by detailed planning and scheduling of tasks. The sequence starts with reviewing the project charter (1) to understand the project's scope, objectives, and constraints. Next, building a Work Breakdown Structure (WBS) (9) helps in organizing the team's work into manageable sections. Identifying all deliverables (2) clarifies the project's outcomes. Defining all activities (8) involves listing the tasks required to produce the deliverables. Identifying the sequence of activities (3) and estimating resources (7) and task dependencies (4) sets the groundwork for scheduling. Estimating the duration of each activity (6) is critical before developing the final schedule (5), which combines all these elements into a comprehensive plan. This approach ensures a structured and methodical progression from project initiation to execution.
References:
"A Guide to the Project Management Body of Knowledge (PMBOK Guide)," Project Management Institute
"Cyber Intelligence-Driven Risk," by Intel471
質問 # 28
Lizzy, an analyst, wants to recognize the level of risks to the organization so as to plan countermeasures against cyber attacks. She used a threat modelling methodology where she performed the following stages:
Stage 1: Build asset-based threat profiles
Stage 2: Identify infrastructure vulnerabilities
Stage 3: Develop security strategy and plans
Which of the following threat modelling methodologies was used by Lizzy in the aforementioned scenario?
- A. OCTAVE
- B. DREAD
- C. TRIKE
- D. VAST
正解：A
解説：
The threat modeling methodology employed by Lizzy, which involves building asset-based threat profiles, identifying infrastructure vulnerabilities, and developing security strategies and plans, aligns with the OCTAVE (Operationally Critical Threat, Asset, and Vulnerability Evaluation) methodology. OCTAVE focuses on organizational risk and security practices, emphasizing self-directed risk assessments to identify and prioritize threats to organizational assets and develop appropriate security strategies and plans. This methodology is asset-driven and revolves around understanding critical assets, identifying threats to those assets, and assessing vulnerabilities, leading to the development of a comprehensive security strategy.References:
* The CERT Guide to System and Network Security Practices by Julia H. Allen
* "OCTAVE Method Implementation Guide Version 2.0," Carnegie Mellon University, Software Engineering Institute
質問 # 29
Tim is working as an analyst in an ABC organization. His organization had been facing many challenges in converting the raw threat intelligence data into meaningful contextual information. After inspection, he found that it was due to noise obtained from misrepresentation of data from huge data collections. Hence, it is important to clean the data before performing data analysis using techniques such as data reduction. He needs to choose an appropriate threat intelligence framework that automatically performs data collection, filtering, and analysis for his organization.
Which of the following threat intelligence frameworks should he choose to perform such task?
- A. TC complete
- B. SIGVERIF
- C. HighCharts
- D. Threat grid
正解：D
解説：
Threat Grid is a threat intelligence and analysis platform that offers advanced capabilities for automatic data collection, filtering, and analysis. It is designed to help organizations convert raw threat data into meaningful, actionable intelligence. By employing advanced analytics and machine learning, Threat Grid can reduce noise from large data sets, helping to eliminate misrepresentations and enhance the quality of the threat intelligence.
This makes it an ideal choice for Tim, who is looking to address the challenges of converting raw data into contextual information and managing the noise from massive data collections.
References:
"Cisco Threat Grid: Unify Your Threat Defense," Cisco
"Integrating and Automating Threat Intelligence," by Threat Grid
質問 # 30
Enrage Tech Company hired Enrique, a security analyst, for performing threat intelligence analysis. While performing data collection process, he used a counterintelligence mechanism where a recursive DNS server is employed to perform interserver DNS communication and when a request is generated from any name server to the recursive DNS server, the recursive DNS servers log the responses that are received. Then it replicates the logged data and stores the data in the central database. Using these logs, he analyzed the malicious attempts that took place over DNS infrastructure.
Which of the following cyber counterintelligence (CCI) gathering technique has Enrique used for data collection?
- A. Data collection through passive DNS monitoring
- B. Data collection through DNS zone transfer
- C. Data collection through DNS interrogation
- D. Data collection through dynamic DNS (DDNS)
正解：A
解説：
Passive DNS monitoring involves collecting data about DNS queries and responses without actively querying DNS servers, thereby not altering or interfering with DNS traffic. This technique allows analysts to track changes in DNS records and observe patterns that may indicate malicious activity. In the scenario described, Enrique is employing passive DNS monitoring by using a recursive DNS server to log the responses received from name servers, storing these logs in a central database for analysis. This approach is effective for identifying malicious domains, mapping malware campaigns, and understanding threat actors' infrastructure without alerting them to the fact that they are being monitored. This method is distinct from active techniques such as DNS interrogation or zone transfers, which involve sending queries to DNS servers, and dynamic DNS, which refers to the automatic updating of DNS records.
References:
SANS Institute InfoSec Reading Room, "Using Passive DNS to Enhance Cyber Threat Intelligence"
"Passive DNS Replication," by Florian Weimer, FIRST Conference Presentation
質問 # 31
Which of the following characteristics of APT refers to numerous attempts done by the attacker to gain entry to the target's network?
- A. Multiphased
- B. Attack origination points
- C. Timeliness
- D. Risk tolerance
正解：B
質問 # 32
Which of the following types of threat attribution deals with the identification of the specific person, society, or a country sponsoring a well-planned and executed intrusion or attack over its target?
- A. True attribution
- B. Campaign attribution
- C. Nation-state attribution
- D. Intrusion-set attribution
正解：A
解説：
True attribution in the context of cyber threats involves identifying the actual individual, group, or nation- state behind an attack or intrusion. This type of attribution goes beyond associating an attack with certain tactics, techniques, and procedures (TTPs) or a known group and aims to pinpoint the real-world entity responsible. True attribution is challenging due to the anonymity of the internet and the use of obfuscation techniques by attackers, but it is crucial for understanding the motive behind an attack and for forming appropriate responses at diplomatic, law enforcement, or cybersecurity levels.
References:
"Attribution of Cyber Attacks: A Framework for an Evidence-Based Analysis" by Jason Healey
"The Challenges of Attribution in Cyberspace" in the Journal of Cyber Policy
質問 # 33
Lizzy, an analyst, wants to recognize the level of risks to the organization so as to plan countermeasures against cyber attacks. She used a threat modelling methodology where she performed the following stages:
Stage 1: Build asset-based threat profiles
Stage 2: Identify infrastructure vulnerabilities
Stage 3: Develop security strategy and plans
Which of the following threat modelling methodologies was used by Lizzy in the aforementioned scenario?
- A. OCTAVE
- B. DREAD
- C. TRIKE
- D. VAST
正解：A
質問 # 34
Jame, a professional hacker, is trying to hack the confidential information of a target organization. He identified the vulnerabilities in the target system and created a tailored deliverable malicious payload using an exploit and a backdoor to send it to the victim.
Which of the following phases of cyber kill chain methodology is Jame executing?
- A. Reconnaissance
- B. Weaponization
- C. Installation
- D. Exploitation
正解：B
質問 # 35
In which of the following forms of bulk data collection are large amounts of data first collected from multiple sources in multiple formats and then processed to achieve threat intelligence?
- A. Production form
- B. Unstructured form
- C. Structured form
- D. Hybrid form
正解：B
質問 # 36
Sean works as a threat intelligence analyst. He is assigned a project for information gathering on a client's network to find a potential threat. He started analysis and was trying to find out the company's internal URLs, looking for any information about the different departments and business units. He was unable to find any information.
What should Sean do to get the information he needs?
- A. Sean should use WayBackMachine in Archive.org to find the company's internal URLs
- B. Sean should use e-mail tracking tools such as EmailTrackerPro to find the company's internal URLs
- C. Sean should use online services such as netcraft.com to find the company's internal URLs
- D. Sean should use website mirroring tools such as HTTrack Web Site Copier to find the company's internal URLs
正解：C
解説：
The goal is to find internal URLs and information about the company's departments and business units.
Since Sean could not find this data directly from public searches, he should turn to online reconnaissance services that provide details about a website's subdomains, internal URLs, hosting structure, and related information.
Netcraft.com is a well-known online reconnaissance and intelligence-gathering service used by security analysts to gather information such as:
* Website structure and internal subdomains
* Server details and operating systems
* Hosting provider and IP ranges
* Technology stack and SSL certificate data
* Historical hosting changes and DNS information
Using Netcraft, Sean can discover internal URLs and subdomains that may reveal internal departments or services linked to the main organization's domain. This type of open-source intelligence (OSINT) is valuable for both threat hunting and vulnerability assessment.
Why the Other Options Are Incorrect:
* A. WayBackMachine (Archive.org):Useful for viewing historical versions of web pages, but it typically shows public pages, not internal or hidden URLs.
* B. Email tracking tools (EmailTrackerPro):These are designed to trace email origins and headers, not to discover website URLs or internal structures.
* C. Website mirroring tools (HTTrack):These tools copy the visible contents of a website but do not reveal hidden internal URLs unless they are publicly linked.
Conclusion:
The correct method for Sean to identify internal URLs and subdomains of the target company is by using online services such as Netcraft.com.
Final Answer: D. Sean should use online services such as netcraft.com to find the company's internal URLs Explanation Reference (Based on CTIA Study Concepts):
According to CTIA study material on Footprinting and Reconnaissance, Netcraft is an effective OSINT- based platform used for discovering detailed website information, including subdomains, server data, and hosting infrastructure.
質問 # 37
A threat analyst wants to incorporate a requirement in the threat knowledge repository that provides an ability to modify or delete past or irrelevant threat data.
Which of the following requirement must he include in the threat knowledge repository to fulfil his needs?
- A. Data management
- B. Protection ranking
- C. Evaluating performance
- D. Searchable functionality
正解：A
解説：
Incorporating a data management requirement in the threat knowledge repository is essential to provide the ability to modify or delete past or irrelevant threat data. Effective data management practices ensure that the repository remains accurate, relevant, and up-to-date by allowing for the adjustment and curation of stored information. This includes removing outdated intelligence, correcting inaccuracies, and updating information as new insights become available. A well-managed repository supports the ongoing relevance and utility of the threat intelligence, aiding in informed decision-making and threat mitigation strategies.
References:
"Building and Maintaining a Threat Intelligence Library," by Recorded Future
"Best Practices for Creating a Threat Intelligence Policy, and How to Use It," by SANS Institute
質問 # 38
Alice, an analyst, shared information with security operation managers and network operations center (NOC) staff for protecting the organizational resources against various threats. Information shared by Alice was highly technical and include threat actor TTPs, malware campaigns, tools used by threat actors, and so on.
Which of the following types of threat intelligence was shared by Alice?
- A. Strategic threat intelligence
- B. Tactical threat intelligence
- C. Technical threat intelligence
- D. Operational threat intelligence
正解：B
解説：
The information shared by Alice, which was highly technical and included details such as threat actor tactics, techniques, and procedures (TTPs), malware campaigns, and tools used by threat actors, aligns with the definition of tactical threat intelligence. This type of intelligence focuses on the immediate, technical indicators of threats and is used bysecurity operation managers and network operations center (NOC) staff to protect organizational resources. Tactical threat intelligence is crucial for configuring security solutions and adjusting defense mechanisms to counteract known threats effectively.References:
* "Tactical Cyber Intelligence," Cyber Threat Intelligence Network, Inc.
* "Cyber Threat Intelligence for Front Line Defenders: A Practical Guide," by James Dietle
質問 # 39
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