How Many Questions Of CS0-003 Exam Answers

NEW QUESTION 1
HOTSPOT
A company recently experienced a security incident. The security team has determined
a user clicked on a link embedded in a phishing email that was sent to the entire company. The link resulted in a malware download, which was subsequently installed and run.
INSTRUCTIONS
Part 1
Review the artifacts associated with the security incident. Identify the name of the malware, the malicious IP address, and the date and time when the malware executable entered the organization.
Part 2
Review the kill chain items and select an appropriate control for each that would improve the security posture of the organization and would have helped to prevent this incident from occurring. Each
control may only be used once, and not all controls will be used.

Firewall log:


File integrity Monitoring Report:


Malware domain list:

Vulnerability Scan Report:


Phishing Email:

• A. Yes
• B. Not Mastered

Answer: A

NEW QUESTION 2
An employee accessed a website that caused a device to become infected with invasive malware. The incident response analyst has:
• created the initial evidence log.
• disabled the wireless adapter on the device.
• interviewed the employee, who was unable to identify the website that was accessed
• reviewed the web proxy traffic logs.
Which of the following should the analyst do to remediate the infected device?

• A. Update the system firmware and reimage the hardware.
• B. Install an additional malware scanner that will send email alerts to the analyst.
• C. Configure the system to use a proxy server for Internet access.
• D. Delete the user profile and restore data from backup.

Answer: A

Explanation:
Updating the system firmware and reimaging the hardware is the best action to perform to remediate the infected device, as it helps to ensure that the device is restored to a clean and secure state and that any traces of malware are removed. Firmware is a type of software that controls the low-level functions of a hardware device, such as a motherboard, hard drive, or network card. Firmware can be updated or flashed to fix bugs, improve performance, or enhance security. Reimaging is a process of erasing and restoring the data on a storage device, such as a hard drive or a solid state drive, using an image file that contains a copy of the operating system, applications, settings, and files. Reimaging can help to recover from system failures, data corruption, or malware infections. Updating the system firmware and reimaging the hardware can help to remediate the infected device by removing any malicious code or configuration changes that may have been made by the malware, as well as restoring any missing or damaged files or settings that may have been affected by the malware. This can help to prevent further damage, data loss, or compromise of the device or the network. The other actions are not as effective or appropriate as updating the system firmware and reimaging the hardware, as they do not address the root cause of the infection or ensure that the device is fully cleaned and secured. Installing an additional malware scanner that will send email alerts to the analyst may help to detect and remove some types of malware, but it may not be able to catch all malware variants or remove them completely. It may also create conflicts or performance issues with other security tools or systems on the device. Configuring the system to use a proxy server for Internet access may help to filter or monitor some types of malicious traffic or requests, but it may not prevent or remove malware that has already infected the device or that uses other methods of communication or propagation. Deleting the user profile and restoring data from backup may help to recover some data or settings that may have been affected by the malware, but it may not remove malware that has infected other parts of the system or that has persisted on the device.

NEW QUESTION 3
A security analyst detects an email server that had been compromised in the internal network. Users have been reporting strange messages in their email inboxes and unusual network traffic. Which of the following incident response steps should be performed next?

• A. Preparation
• B. Validation
• C. Containment
• D. Eradication

Answer: C

Explanation:
After detecting a compromised email server and unusual network traffic, the next step in incident response is containment, to prevent further damage or spread of the compromise. ReferencesC: ompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5: Incident Response, page 197.

NEW QUESTION 4
When starting an investigation, which of the following must be done first?

• A. Notify law enforcement
• B. Secure the scene
• C. Seize all related evidence
• D. Interview the witnesses

Answer: B

Explanation:
The first thing that must be done when starting an investigation is to secure the scene. Securing the scene involves isolating and protecting the area where the incident occurred, as well as any potential evidence or witnesses. Securing the scene can help prevent any tampering, contamination, or destruction of evidence, as well as any interference or obstruction of the investigation.

NEW QUESTION 5
A security analyst is validating a particular finding that was reported in a web application vulnerability scan to make sure it is not a false positive. The security analyst uses the snippet below:

Which of the following vulnerability types is the security analyst validating?

• A. Directory traversal
• B. XSS
• C. XXE
• D. SSRF

Answer: B

Explanation:
XSS (cross-site scripting) is the vulnerability type that the security analyst is validating, as the snippet shows an attempt to inject a script tag into the web application. XSS is a web security vulnerability that allows an attacker to execute arbitrary JavaScript code in the browser of another user who visits the vulnerable website. XSS can be used to perform various malicious actions, such as stealing cookies, session hijacking, phishing, or defacing websites. The other vulnerability types are not relevant to the snippet, as they involve different kinds of attacks. Directory traversal is an attack that allows an attacker to access files and directories that are outside of the web root folder. XXE (XML external entity) injection is an attack that allows an attacker to interfere with an application’s processing of XML data, and potentially access files or systems. SSRF (server-side request forgery) is an attack that allows an attacker to induce the server-side application to make requests to an unintended location. Official References:
✑ https://portswigger.net/web-security/xxe
✑ https://portswigger.net/web-security/ssrf
✑ https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html

NEW QUESTION 6
A recent penetration test discovered that several employees were enticed to assist attackers by visiting specific websites and running downloaded files when prompted by phone calls. Which of the following would best address this issue?

• A. Increasing training and awareness for all staff
• B. Ensuring that malicious websites cannot be visited
• C. Blocking all scripts downloaded from the internet
• D. Disabling all staff members' ability to run downloaded applications

Answer: A

Explanation:
Increasing training and awareness for all staff is the best way to address the issue of employees being enticed to assist attackers by visiting specific websites and running downloaded files when prompted by phone calls. This issue is an example of social engineering, which is a technique that exploits human psychology and behavior to manipulate people into performing actions or divulging information that benefit the attackers. Social engineering can take many forms, such as phishing, vishing, baiting, quid pro quo, or impersonation. The best defense against social engineering is to educate and train the staff on how to recognize and avoid common social engineering tactics, such as:
✑ Verifying the identity and legitimacy of the caller or sender before following their instructions or clicking on any links or attachments
✑ Being wary of unsolicited or unexpected requests for information or action, especially if they involve urgency, pressure, or threats
✑ Reporting any suspicious or anomalous activity to the security team or the appropriate authority
✑ Following the organization’s policies and procedures on security awareness and best practices
Official References:
✑ https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002- exam-objectives
✑ https://www.comptia.org/certifications/cybersecurity-analyst
✑ https://www.comptia.org/blog/the-new-comptia-cybersecurity-analyst-your- questions-answered

NEW QUESTION 7
A security analyst is performing an investigation involving multiple targeted Windows malware binaries. The analyst wants to gather intelligence without disclosing information to the attackers. Which of the following actions would allow the analyst to achieve the objective?

• A. Upload the binary to an air gapped sandbox for analysis
• B. Send the binaries to the antivirus vendor
• C. Execute the binaries on an environment with internet connectivity
• D. Query the file hashes using VirusTotal

Answer: A

Explanation:
The best action that would allow the analyst to gather intelligence without disclosing information to the attackers is to upload the binary to an air gapped sandbox for analysis. An air gapped sandbox is an isolated environment that has no connection to any external network or system. Uploading the binary to an air gapped sandbox can prevent any communication or interaction between the binary and the attackers, as well as any potential harm or infection to other systems or networks. An air gapped sandbox can also allow the analyst to safely analyze and observe the behavior, functionality, or characteristics of the binary.

NEW QUESTION 8
A security analyst needs to mitigate a known, exploited vulnerability related not tack vector that embeds software through the USB interface. Which of the following should the analyst do first?

• A. Conduct security awareness training on the risks of using unknown and unencrypted USBs.
• B. Write a removable media policy that explains that USBs cannot be connected to a company asset.
• C. Check configurations to determine whether USB ports are enabled on company assets.
• D. Review logs to see whether this exploitable vulnerability has already impacted the company.

Answer: C

Explanation:
USB ports are a common attack vector that can be used to deliver malware, steal data, or compromise systems. The first step to mitigate this vulnerability is to check the configurations of the company assets and disable or restrict the USB ports if possible. This will prevent unauthorized devices from being connected and reduce the attack surface. The other options are also important, but they are not the first priority in this scenario.
References:
✑ CompTIA CySA+ CS0-003 Certification Study Guide, page 247
✑ What are Attack Vectors: Definition & Vulnerabilities, section “How to secure attack vectors”
✑ Are there any attack vectors for a printer connected through USB in a Windows environment?, answer by user “schroeder”

NEW QUESTION 9
An organization discovered a data breach that resulted in Pll being released to the public. During the lessons learned review, the panel identified discrepancies regarding who was responsible for external reporting, as well as the timing requirements. Which of the following actions would best address the reporting issue?

• A. Creating a playbook denoting specific SLAs and containment actions per incident type
• B. Researching federal laws, regulatory compliance requirements, and organizational policies to document specific reporting SLAs
• C. Defining which security incidents require external notifications and incident reporting in addition to internal stakeholders
• D. Designating specific roles and responsibilities within the security team and stakeholders to streamline tasks

Answer: B

Explanation:
Researching federal laws, regulatory compliance requirements, and organizational policies to document specific reporting SLAs is the best action to address the reporting issue. Reporting SLAs are service level agreements that specify the time frame and the format for notifying the relevant authorities and the affected individuals of a data breach. Reporting SLAs may vary depending on the type and severity of the breach, the type and location of the data, the industry and jurisdiction of the organization, and the internal policies of the organization. By researching and documenting the reporting SLAs for different scenarios, the organization can ensure that it complies with the legal and ethical obligations of data breach notification, and avoid any penalties, fines, or lawsuits that may result from failing to report a breach in a timely and appropriate manner12. References: When and how to report a breach: Data breach reporting best practices, Incident and Breach Management

NEW QUESTION 10
A security analyst at a company called ACME Commercial notices there is outbound traffic to a host IP that resolves to https://offce365password.acme.co. The site's standard VPN logon page is
www.acme.com/logon. Which of the following is most likely true?

• A. This is a normal password change URL.
• B. The security operations center is performing a routine password audit.
• C. A new VPN gateway has been deployed
• D. A social engineering attack is underway

Answer: D

Explanation:
A social engineering attack is underway is the most likely explanation for the outbound traffic to a host IP that resolves to https://offce365password.acme.co, while the site’s standard VPN logon page is www.acme.com/logon. A social engineering attack is a technique that exploits human psychology and behavior to manipulate people into performing actions or divulging information that benefit the attackers. A common type of social engineering attack is phishing, which involves sending fraudulent emails or other messages that appear to come from a legitimate source, such as a company or a colleague, and lure the recipients into clicking on malicious links or attachments, or entering their credentials or other sensitive information on fake websites. In this case, the attackers may have registered a domain name that looks similar to the company’s domain name, but with a typo (offce365 instead of office365), and set up a fake website that mimics the company’s VPN logon page. The attackers may have also sent phishing emails to the company’s employees, asking them to reset their passwords or log in to their VPN accounts using the malicious link. The security analyst should investigate the source and content of the phishing emails, and alert the employees not to click on any suspicious links or enter their credentials on any untrusted websites. Official References:
✑ https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
✑ https://www.comptia.org/certifications/cybersecurity-analyst
✑ https://www.comptia.org/blog/the-new-comptia-cybersecurity-analyst-your-questions-answered

NEW QUESTION 11
Given the following CVSS string- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/3:U/C:K/I:K/A:H
Which of the following attributes correctly describes this vulnerability?

• A. A user is required to exploit this vulnerability.
• B. The vulnerability is network based.
• C. The vulnerability does not affect confidentiality.
• D. The complexity to exploit the vulnerability is high.

Answer: B

Explanation:
The vulnerability is network based is the correct attribute that describes this vulnerability, as it can be inferred from the CVSS string. CVSS stands for Common Vulnerability Scoring System, which is a framework that assigns numerical scores and ratings to vulnerabilities based on their characteristics and severity. The CVSS string consists of several metrics that define different aspects of the vulnerability, such as the attack vector, the attack complexity, the privileges required, the user interaction, the scope, and the impact on confidentiality, integrity and availability. The first metric in the CVSS string is the attack vector (AV), which indicates how the vulnerability can be exploited. The value of AV in this case is N, which stands for network. This means that the vulnerability can be exploited remotely over a network connection, without physical or logical access to the target system. Therefore, the vulnerability is network based. Official References:
✑ https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
✑ https://www.comptia.org/certifications/cybersecurity-analyst
✑ https://packitforwarding.com/index.php/2019/01/10/comptia-cysa-common-vulnerability-scoring-system-cvss/

NEW QUESTION 12
Which of the following best describes the goal of a tabletop exercise?

• A. To test possible incident scenarios and how to react properly
• B. To perform attack exercises to check response effectiveness
• C. To understand existing threat actors and how to replicate their techniques
• D. To check the effectiveness of the business continuity plan

Answer: A

Explanation:
A tabletop exercise is a type of simulation exercise that involves testing possible incident scenarios and how to react properly, without actually performing any actions or using any resources. A tabletop exercise is usually conducted by a facilitator who presents a realistic scenario to a group of participants, such as a cyberattack, a natural disaster, or a data breach. The participants then discuss and evaluate their roles, responsibilities, plans, procedures, and policies for responding to the incident, as well as the potential impacts and outcomes. A tabletop exercise can help identify strengths and weaknesses in the incident response plan, improve communication and coordination among the stakeholders, raise awareness and preparedness for potential incidents, and provide feedback and recommendations for improvement.

NEW QUESTION 13
Which Of the following techniques would be best to provide the necessary assurance for embedded software that drives centrifugal pumps at a power Plant?

• A. Containerization
• B. Manual code reviews
• C. Static and dynamic analysis
• D. Formal methods

Answer: D

Explanation:
According to the CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition1, the best technique to provide the necessary assurance for embedded software that drives centrifugal pumps at a power plant is formal methods. Formal methods are a rigorous and mathematical approach to software development and verification, which can ensure the correctness and reliability of critical software systems. Formal methods can be used to specify, design, implement, and verify embedded software using formal languages, logics, and tools1.
Containerization, manual code reviews, and static and dynamic analysis are also useful techniques for software assurance, but they are not as rigorous or comprehensive as formal methods. Containerization is a method of isolating and packaging software applications with their dependencies, which can improve security, portability, and scalability. Manual code reviews are a process of examining the source code of a software program by human reviewers, which can help identify errors, vulnerabilities, and compliance issues. Static and dynamic analysis are techniques of testing and evaluating software without executing it (static) or while executing it (dynamic), which can help detect bugs, defects, and performance issues1.

NEW QUESTION 14
An analyst has been asked to validate the potential risk of a new ransomware campaign that the Chief Financial Officer read about in the newspaper. The company is a manufacturer of a very small spring used in the newest fighter jet and is a critical piece of the supply chain for this aircraft. Which of the following would be the best threat intelligence source to learn about this new campaign?

• A. Information sharing organization
• B. Blogs/forums
• C. Cybersecuritv incident response team
• D. Deep/dark web

Answer: A

Explanation:
An information sharing organization is a group or network of organizations that share threat intelligence, best practices, or lessons learned related to cybersecurity issues or incidents. An information sharing organization can help security analysts learn about new ransomware campaigns or other emerging threats, as well as get recommendations or guidance on how to prevent, detect, or respond to them. An information sharing organization can also help security analysts collaborate or coordinate with other organizations in the same industry or region that may face similar threats or challenges.

NEW QUESTION 15
Which of the following would help to minimize human engagement and aid in process improvement in security operations?

• A. OSSTMM
• B. SIEM
• C. SOAR
• D. QVVASP

Answer: C

Explanation:
SOAR stands for security orchestration, automation, and response, which is a term that describes a set of tools, technologies, or platforms that can help streamline, standardize, and automate security operations and incident response processes and tasks. SOAR can help minimize human engagement and aid in process improvement in security operations by reducing manual work, human errors, response time, or complexity. SOAR can also help enhance collaboration, coordination, efficiency, or effectiveness of security operations and incident response teams.

NEW QUESTION 16
An organization enabled a SIEM rule to send an alert to a security analyst distribution list when ten failed logins occur within one minute. However, the control was unable to detect an attack with nine failed logins. Which of the following best represents what occurred?

• A. False positive
• B. True negative
• C. False negative
• D. True positive

Answer: C

Explanation:
The correct answer is C. False negative.
A false negative is a situation where an attack or a threat is not detected by a security control, even though it should have been. In this case, the SIEM rule was unable to detect an attack with nine failed logins, which is below the threshold of ten failed logins that triggers an alert. This means that the SIEM rule missed a potential attack and failed to alert the security analysts, resulting in a false negative.
A false positive is a situation where a benign or normal activity is detected as an attack or a threat by a security control, even though it is not. A true negative is a situation where a benign or normal activity is not detected as an attack or a threat by a security control, as expected. A true positive is a situation where an attack or a threat is detected by a security control, as expected. These are not the correct answers for this question.

NEW QUESTION 17
A systems administrator receives reports of an internet-accessible Linux server that is running very sluggishly. The administrator examines the server, sees a high amount of memory utilization, and suspects a DoS attack related to half-open TCP sessions consuming memory. Which of the following tools would best help to prove whether this server was experiencing this behavior?

• A. Nmap
• B. TCPDump
• C. SIEM
• D. EDR

Answer: B

Explanation:
TCPDump is the best tool to prove whether the server was experiencing a DoS attack related to half-open TCP sessions consuming memory. TCPDump is a command-line tool that can capture and analyze network traffic, such as TCP, UDP, and ICMP packets. TCPDump can help the administrator to identify the source and destination of the traffic, the TCP flags and sequence numbers, the packet size and frequency, and other information that can indicate a DoS attack. A DoS attack related to half-open TCP sessions is also known as a SYN flood attack, which is a type of volumetric attack that aims to exhaust the network bandwidth or resources of the target server by sending a large amount of TCP SYN requests and ignoring the TCP SYN-ACK responses. This creates a backlog of half-open connections on the server, which consume memory and CPU resources, and prevent legitimate connections from being established12. TCPDump can help the administrator to detect a SYN flood attack by looking for a high number of TCP SYN packets with different source IP addresses, a low number of TCP SYN-ACK packets, and a very low number of TCP ACK packets34. References: SYN flood DDoS attack | Cloudflare, What is a SYN flood attack and how to prevent it? | NETSCOUT, TCPDump - A Powerful Tool for Network Analysis and Security, How to Detect a SYN Flood Attack with TCPDump

NEW QUESTION 18
A security analyst received a malicious binary file to analyze. Which of the following is the best technique to perform the analysis?

• A. Code analysis
• B. Static analysis
• C. Reverse engineering
• D. Fuzzing

Answer: C

Explanation:
Reverse engineering is a technique that involves analyzing a binary file to understand its structure, functionality, and behavior. Reverse engineering can help security analysts perform malware analysis, vulnerability research, exploit development, and software debugging. Reverse engineering can be done using various tools, such as disassemblers, debuggers, decompilers, and hex editors.

NEW QUESTION 19
A security analyst is trying to detect connections to a suspicious IP address by collecting the packet captures from the gateway. Which of the following commands should the security analyst consider running?

• A. grep [IP address] packets.pcapB cat packets.pcap | grep [IP Address]
• B. tcpdump -n -r packets.pcap host [IP address]
• C. strings packets.pcap | grep [IP Address]

Answer: C

Explanation:
tcpdump is a command-line tool that can capture and analyze network packets from a given interface or file. The -n option prevents tcpdump from resolving hostnames, which can speed up the analysis. The -r option reads packets from a file, in this case packets.pcap. The host [IP address] filter specifies that tcpdump should only display packets that have the given IP address as either the source or the destination. This command can help the security analyst detect connections to a suspicious IP address by collecting the packet captures from the gateway. Official References:
✑ https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
✑ https://www.techtarget.com/searchsecurity/quiz/Sample-CompTIA-CySA-test- questions-with-answers
✑ https://www.reddit.com/r/CompTIA/comments/tmxx84/passed_cysa_heres_my_experience_and_how_i_studied/

NEW QUESTION 20
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