2025年最新のCS0-003問題集PDFでCS0-003リアル試験問題解答
有効なCS0-003テスト解答とCompTIA CS0-003試験PDF問題を試そう
CompTIA CS0-003 認定試験の出題範囲：
| トピック | 出題範囲 |
|---|---|
| トピック 1 |
|
| トピック 2 |
|
| トピック 3 |
|
| トピック 4 |
|
質問 # 58
An email hosting provider added a new data center with new public IP addresses. Which of the following most likely needs to be updated to ensure emails from the new data center do not get blocked by spam filters?
- A. DMARC
- B. SPF
- C. DKIM
- D. SMTP
正解：B
解説：
SPF (Sender Policy Framework) is a DNS TXT record that lists authorized sending IP addresses for a given domain. If an email hosting provider added a new data center with new public IP addresses, the SPF record needs to be updated to include those new IP addresses, otherwise the emails from the new data center may fail SPF checks and get blocked by spam filters123 Reference: 1: Use DMARC to validate email, setup steps 2: How to set up SPF, DKIM and DMARC: other mail & hosting providers providers 3: Set up SPF, DKIM, or DMARC records for my hosting email
質問 # 59
A SIEM alert is triggered based on execution of a suspicious one-liner on two workstations in the organization's environment. An analyst views the details of these events below:
Which of the following statements best describes the intent of the attacker, based on this one-liner?
- A. Attacker is attempting to install persistence mechanisms on the target machine.
- B. Attacker is escalating privileges via JavaScript.
- C. Attacker is executing PowerShell script "AccessToken.psr.
- D. Attacker is utilizing custom malware to download an additional script.
正解：D
解説：
The one-liner script is utilizing JavaScript to execute a PowerShell command that downloads and runs a script from an external source, indicating the use of custom malware to download an additional script. References:
CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 4: Security Operations and Monitoring, page 156.
質問 # 60
Which of the following threat actors is most likely to target a company due to its questionable environmental policies?
- A. Lone wolf
- B. Hacktivist
- C. Organized crime
- D. Nation-state
正解：B
質問 # 61
An analyst recommends that an EDR agent collect the source IP address, make a connection to the firewall, and create a policy to block the malicious source IP address across the entire network automatically. Which of the following is the best option to help the analyst implement this recommendation?
- A. SLA
- B. SOAR
- C. SIEM
- D. IoC
正解：B
解説：
SOAR (Security Orchestration, Automation, and Response) is the best option to help the analyst implement the recommendation, as it reflects the software solution that enables security teams to integrate and coordinate separate tools into streamlined threat response workflows and automate repetitive tasks. SOAR is a term coined by Gartner in 2015 to describe a technology that combines the functions of security incident response platforms, security orchestration and automation platforms, and threat intelligence platforms in one offering.
SOAR solutions help security teams to collect inputs from various sources, such as EDR agents, firewalls, or SIEM systems, and perform analysis and triage using a combination of human and machine power. SOAR solutions also allow security teams to define and execute incident response procedures in a digital workflow format, using automation to perform low-level tasks or actions, such as blocking an IP address or quarantining a device. SOAR solutions can help security teams to improve efficiency, consistency, and scalability of their operations, as well as reduce mean time to detect (MTTD) and mean time to respond (MTTR) to threats. The other options are not as suitable as SOAR, as they do not match the description or purpose of the recommendation. SIEM (Security Information and Event Management) is a software solution that collects and analyzes data from various sources, such as logs, events, or alerts, and provides security monitoring, threat detection, and incident response capabilities. SIEM solutions can help security teams to gain visibility, correlation, and context of their security data, but they do not provide automation or orchestration features like SOAR solutions. SLA (Service Level Agreement) is a document that defines the expectations and responsibilities between a service provider and a customer, such as the quality, availability, or performance of the service. SLAs can help to manage customer expectations, formalize communication, and improve productivity and relationships, but they do not help to implement technical recommendations like SOAR solutions. IoC (Indicator of Compromise) is a piece of data or evidence that suggests a system or network has been compromised by a threat actor, such as an IP address, a file hash, or a registry key. IoCs can help to identify and analyze malicious activities or incidents, but they do not help to implement response actions like SOAR solutions.
質問 # 62
An organization is conducting a pilot deployment of an e-commerce application. The application's source code is not available. Which of the following strategies should an analyst recommend to evaluate the security of the software?
- A. Dynamic testing
- B. Penetration testing
- C. Vulnerability testing
- D. Static testing
正解：B
解説：
Penetration testing is the best strategy to evaluate the security of the software without the source code. Penetration testing is a type of security testing that simulates real-world attacks on the software to identify and exploit its vulnerabilities. Penetration testing can be performed on the software as a black box, meaning that the tester does not need to have access to the source code or the internal structure of the software. Penetration testing can help the analyst to assess the security posture of the software, the potential impact of the vulnerabilities, and the effectiveness of the existing security controls. Static testing, vulnerability testing, and dynamic testing are other types of security testing, but they usually require access to the source code or the internal structure of the software. Static testing is the analysis of the software code or design without executing it. Vulnerability testing is the identification and evaluation of the software weaknesses or flaws. Dynamic testing is the analysis of the software code or design while executing it.
質問 # 63
During a security test, a security analyst found a critical application with a buffer overflow vulnerability. Which of the following would be best to mitigate the vulnerability at the application level?
- A. Implement input validation.
- B. Configure address space layout randomization.
- C. Update third-party dependencies.
- D. Perform OS hardening.
正解：A
解説：
Implementing input validation is the best way to mitigate the buffer overflow vulnerability at the application level. Input validation is a technique that checks the data entered by users or attackers against a set of rules or constraints, such as data type, length, format, or range. Input validation can prevent common web application attacks such as SQL injection, cross-site scripting (XSS), or command injection, which exploit the lack of input validation to execute malicious code or commands on the server or the client side. By validating the input before allowing submission, the web application can reject or sanitize any malicious or unexpected input, and protect the application from being compromised12. Reference: How to detect, prevent, and mitigate buffer overflow attacks - Synopsys, How to mitigate buffer overflow vulnerabilities | Infosec
質問 # 64
Which of the following best describes the threat concept in which an organization works to ensure that all network users only open attachments from known sources?
- A. Unintentional insider threat
- B. Nation-state threat
- C. Hacktivist threat
- D. Advanced persistent threat
正解：A
解説：
An unintentional insider threat is a type of network security threat that occurs when a legitimate user of the network unknowingly exposes the network to malicious activity, such as opening a phishing email or a malware-infected attachment from an unknown source. This can compromise the network security and allow attackers to access sensitive data or systems. The other options are not related to the threat concept of ensuring that all network users only open attachments from known sources.
Reference CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 1: Threat and Vulnerability Management, page 13. What is Network Security | Threats, Best Practices | Imperva, Network Security Threats and Attacks, Phishing section. Five Ways to Defend Against Network Security Threats, 2. Use Firewalls section.
質問 # 65
During a company's most recent incident, a vulnerability in custom software was exploited on an externally facing server by an APT. The lessons-learned report noted the following:
* The development team used a new software language that was not supported by the security team's automated assessment tools.
* During the deployment, the security assessment team was unfamiliar with the new language and struggled to evaluate the software during advanced testing. Therefore, the vulnerability was not detected.
* The current IPS did not have effective signatures and policies in place to detect and prevent runtime attacks on the new application.
To allow this new technology to be deployed securely going forward, which of the following will BEST address these findings? (Choose two.)
- A. Run the software on isolated systems so when they are compromised, the attacker cannot pivot to adjacent systems
- B. Outsource development and hosting of the applications in the new language to a third-party vendor so the risk is transferred to that provider
- C. Work with the automated assessment-tool vendor to add support for the new language so these vulnerabilities are discovered automatically
- D. Train the security assessment team to evaluate the new language and verify that best practices for secure coding have been followed
- E. Contact the human resources department to hire new security team members who are already familiar with the new language
- F. Instruct only the development team to document the remediation steps for this vulnerability
正解：C、D
解説：
The solution will address the findings that the development team used a new software language that was not supported by the security team's automated assessment tools and the security assessment team was unfamiliar with the new language and struggled to evaluate the software during advanced testing. The training of the security assessment team and working with the automated assessment-tool vendor to add support for the new language will ensure that future deployments of the new technology are secure and the vulnerabilities are detected and prevented.
質問 # 66
The security team at a company, which was a recent target of ransomware, compiled a list of hosts that were identified as impacted and in scope for this incident. Based on the following host list:
Which of the following systems was most pivotal to the threat actor in its distribution of the encryption binary via Group Policy?
- A. WK10-Sales07
- B. WK7-Plant01
- C. SQL01
- D. DCEast01
- E. HQAdmin9
正解：D
解説：
Based on the list of hosts and their functions, DCEast01, which is a Domain Controller, would be the most pivotal in the distribution of an encryption binary via Group Policy. Domain Controllers are responsible for security and administrative policies within a Windows Domain. Group Policy is a feature of Windows that facilitates a wide range of advanced settings that administrators can use to control the working environment of user accounts and computer accounts. Group Policy can be used to deploy software, which in this case would be the encryption binary of the ransomware. SQL01 is a database server and unlikely to be used for this purpose. WK10-Sales07 and WK7-Plant01 are client machines, and HQAdmin9, although it is a network admin laptop, would not typically be used to distribute policies across a network.
質問 # 67
A security analyst is responding to an indent that involves a malicious attack on a network. Data closet. Which of the following best explains how are analyst should properly document the incident?
- A. Take photos of the impacted items
- B. Back up the configuration file for alt network devices
- C. Record and validate each connection
- D. Create a full diagram of the network infrastructure
正解：A
解説：
When documenting a physical incident in a network data closet, taking photos provides a clear and immediate record of the situation, which is essential for thorough incident documentation and subsequent investigation.
Proper documentation of an incident in a data closet should include taking photos of the impacted items. This provides visual evidence and helps in understanding the physical context of the incident, which is crucial for a thorough investigation. Backing up configuration files, recording connections, and creating network diagrams, while important, are not the primary means of documenting the physical aspects of an incident.
質問 # 68
A security analyst is tasked with prioritizing vulnerabilities for remediation. The relevant company security policies are shown below:
Security Policy 1006: Vulnerability Management
1. The Company shall use the CVSSv3.1 Base Score Metrics (Exploitability and Impact) to prioritize the remediation of security vulnerabilities.
2. In situations where a choice must be made between confidentiality and availability, the Company shall prioritize confidentiality of data over availability of systems and data.
3. The Company shall prioritize patching of publicly available systems and services over patching of internally available system.
According to the security policy, which of the following vulnerabilities should be the highest priority to patch?
- A.
- B.
- C.
- D.
正解：A
解説：
According to the security policy, the company shall use the CVSSv3.1 Base Score Metrics to prioritize the remediation of security vulnerabilities. Option C has the highest CVSSv3.1 Base Score of 9.8, which indicates a critical severity level. The company shall also prioritize confidentiality of data over availability of systems and data, and option C has a high impact on confidentiality (C:H). Finally, the company shall prioritize patching of publicly available systems and services over patching of internally available systems, and option C affects a public-facing web server. Official References: https://www.first.org/cvss/
質問 # 69
The Chief Executive Officer of an organization recently heard that exploitation of new attacks in the industry was happening approximately 45 days after a patch was released. Which of the following would best protect this organization?
- A. A mean time to respond of 15 days
- B. A mean time to detect of 45 days
- C. A mean time to remediate of 30 days
- D. Third-party application testing
正解：C
解説：
A mean time to remediate (MTTR) is a metric that measures how long it takes to fix a vulnerability after it is discovered. A MTTR of 30 days would best protect the organization from the new attacks that are exploited
45 days after a patch is released, as it would ensure that the vulnerabilities are fixed before they are exploited
質問 # 70
During an incident in which a user machine was compromised, an analyst recovered a binary file that potentially caused the exploitation. Which of the following techniques could be used for further analysis?
- A. Fuzzing
- B. Sandboxing
- C. Packet capture
- D. Static analysis
正解：D
質問 # 71
An employee downloads a freeware program to change the desktop to the classic look of legacy Windows.
Shortly after the employee installs the program, a high volume of random DNS queries begin to originate from the system. An investigation on the system reveals the following:
Add-MpPreference -ExclusionPath '%Program Filest\ksysconfig'
Which of the following is possibly occurring?
- A. Credential harvesting
- B. Privilege escalation
- C. Persistence
- D. Defense evasion
正解：D
解説：
Defense evasion is the technique of avoiding detection or prevention by security tools or mechanisms. In this case, the freeware program is likely a malware that generates random DNS queries to communicate with a command and control server or exfiltrate data. The command Add-MpPreference -ExclusionPath '%Program Filest\ksysconfig' is used to add an exclusion path to Windows Defender, which is a built-in antivirus software, to prevent it from scanning the malware folder. References: CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5, page 204; CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 5, page 212. pr
質問 # 72
An incident response analyst is investigating the root cause of a recent malware outbreak. Initial binary analysis indicates that this malware disables host security services and performs cleanup routines on it infected hosts, including deletion of initial dropper and removal of event log entries and prefetch files from the host. Which of the following data sources would most likely reveal evidence of the root cause?
(Select two).
- A. File system metadata
- B. Registry artifacts
- C. EDR data
- D. Sysmon event log
- E. Creation time of dropper
- F. Prefetch files
正解：B、C
解説：
Registry artifacts and EDR data are two data sources that can provide valuable information about the root cause of a malware outbreak. Registry artifacts can reveal changes made by the malware to the system configuration, such as disabling security services, modifying startup items, or creating persistence mechanisms1. EDR data can capture the behavior and network activity of the malware, such as the initial infection vector, the command and control communication, or the lateral movement2. These data sources can help the analyst identify the malware family, the attack technique, and the threat actor behind the outbreak.
References: Malware Analysis | CISA, Malware Analysis: Steps & Examples - CrowdStrike
質問 # 73
A security analyst has found the following suspicious DNS traffic while analyzing a packet capture:
* DNS traffic while a tunneling session is active.
* The mean time between queries is less than one second.
* The average query length exceeds 100 characters.
Which of the following attacks most likely occurred?
- A. DNS exfiltration
- B. DNS spoofing
- C. DNS poisoning
- D. DNS zone transfer
正解：A
解説：
DNS exfiltration is a technique that uses the DNS protocol to transfer data from a compromised network or device to an attacker-controlled server. DNS exfiltration can bypass firewall rules and security products that do not inspect DNS traffic. The characteristics of the suspicious DNS traffic in the question match the indicators of DNS exfiltration, such as:
DNS traffic while a tunneling session is active: This implies that the DNS protocol is being used to create a covert channel for data transfer.
The mean time between queries is less than one second: This implies that the DNS queries are being sent at a high frequency to maximize the amount of data transferred.
The average query length exceeds 100 characters: This implies that the DNS queries are encoding large amounts of data in the subdomains or other fields of the DNS packets.
Official References:
https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
https://resources.infosecinstitute.com/topic/bypassing-security-products-via-dns-data-exfiltration/
https://www.reddit.com/r/CompTIA/comments/nvjuzt/dns_exfiltration_explanation/
質問 # 74
......
CS0-003試験問題集でPDF問題とテストエンジン：https://jp.fast2test.com/CS0-003-premium-file.html
実際に出るCS0-003試験問題集には正確で更新された問題：https://drive.google.com/open?id=1mYCLTozfngxpl2klGL6ausS2F83ioGSq