Pass CompTIA Cybersecurity Analyst CS0-003 exam [Dec 02, 2025] Updated 622 Questions
CompTIA CS0-003 Actual Questions and 100% Cover Real Exam Questions
CompTIA Cybersecurity Analyst (CySA+) Certification Exam, also known as the CS0-003 exam, is a certification that assesses an individual's knowledge and skills in cybersecurity analytics, threat management, and response. CompTIA Cybersecurity Analyst (CySA+) Certification Exam certification is intended for professionals who want to advance their careers in the field of cybersecurity and become Cybersecurity Analysts. CompTIA Cybersecurity Analyst (CySA+) Certification Exam certification is globally recognized and is ideal for individuals who are looking to validate their skills and knowledge in the field of cybersecurity.
CompTIA Cybersecurity Analyst (CySA+) Certification Exam, also known as CS0-003, is a certification exam designed for IT professionals who want to establish their skills in cybersecurity analysis. CompTIA Cybersecurity Analyst (CySA+) Certification Exam certification is the most recent addition to the CompTIA IT certifications and is well recognized globally. CompTIA Cybersecurity Analyst (CySA+) Certification Exam certification exam measures the skills required to configure and use threat detection tools, analyze data, and identify vulnerabilities, threats, and risks to an organization's security.
To pass the CS0-003 certification exam, candidates must demonstrate their ability to perform real-world cybersecurity tasks. They must be able to analyze data to identify security threats, develop and implement effective security policies and procedures, and respond to security incidents in a timely and effective manner. Candidates are expected to have a strong understanding of cybersecurity concepts and principles, as well as hands-on experience in the field.
NEW QUESTION # 338
A security analyst needs to provide evidence of regular vulnerability scanning on the company's network for an auditing process. Which of the following is an example of a tool that can produce such evidence?
- A. Burp Suite
- B. Wireshark
- C. Nmap
- D. OpenVAS
Answer: D
Explanation:
OpenVAS is an open-source tool that performs comprehensive vulnerability scanning and assessment on the network. It can generate reports and evidence of the scan results, which can be used for auditing purposes. Reference: CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5, page 199; CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 5, page 207.
NEW QUESTION # 339
You are a penetration tester who is reviewing the system hardening guidelines for a company. Hardening guidelines indicate the following.
* There must be one primary server or service per device.
* Only default port should be used
* Non- secure protocols should be disabled.
* The corporate internet presence should be placed in a protected subnet Instructions :
* Using the available tools, discover devices on the corporate network and the services running on these devices.
You must determine
* ip address of each device
* The primary server or service each device
* The protocols that should be disabled based on the hardening guidelines
Answer:
Explanation:
see the answer below in explanation:
Explanation:
Answer below images
NEW QUESTION # 340
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. EDR data
- B. File system metadata
- C. Registry artifacts
- D. Creation time of dropper
- E. Prefetch files
- F. Sysmon event log
Answer: A,C
Explanation:
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.
NEW QUESTION # 341
During the triage of a SIEM alarm, a security analyst identifies the following activity on a .bash_historyfile:
Which of the following actions should the analyst take?
- A. Declare an incident and look for lateral movements.
- B. Declare an incident and look for malware in the affected machine.
- C. Declare a false positive and close the alarm.
- D. Declare an incident and look for data exfiltration.
Answer: D
Explanation:
The Bash history shows a small Python script being written that reads "secretsauce.txt," retrieves each entry via HTTP, and then POSTS the retrieved content to an external server. Finally, the script is marked executable and run. This is a clear attempt to siphon sensitive data off-host, so you should treat it as a confirmed incident and investigate what data has been exfiltrated.
NEW QUESTION # 342
A security analyst must preserve a system hard drive that was involved in a litigation request.
Which of the following is the best method to ensure the data on the device is not modified?
- A. Protect the device with a complex password.
- B. Perform a memory scan dump to collect residual data
- C. Encrypt the device to ensure confidentiality of the data.
- D. Generate a hash value and make a backup image.
Answer: D
Explanation:
Generating a hash value and making a backup image is the best method to ensure the data on the device is not modified, as it creates a verifiable copy of the original data that can be used for forensic analysis. Encrypting the device, protecting it with a password, or performing a memory scan dump do not prevent the data from being altered or deleted.
NEW QUESTION # 343
During the forensic analysis of a compromised machine, a security analyst discovers some binaries that are exhibiting abnormal behaviors. After extracting the strings, the analyst finds unexpected content. Which of the following is the next step the analyst should take?
- A. Only allow binaries on the approve list to execute.
- B. Run an antivirus against the binaries to check for malware.
- C. Use file integrity monitoring to validate the digital signature
- D. Validate the binaries' hashes from a trusted source.
Answer: D
Explanation:
Validating the binaries' hashes from a trusted source is the next step the analyst should take after discovering some binaries that are exhibiting abnormal behaviors and finding unexpected content in their strings. A hash is a fixed-length value that uniquely represents the contents of a file or message. By comparing the hashes of the binaries on the compromised machine with the hashes of the original or legitimate binaries from a trusted source, such as the software vendor or repository, the analyst can determine whether the binaries have been modified or replaced by malicious code. If the hashes do not match, it indicates that the binaries have been tampered with and may contain malware.
NEW QUESTION # 344
A zero-day command injection vulnerability was published. A security administrator is analyzing the following logs for evidence of adversaries attempting to exploit the vulnerability:
Which of the following log entries provides evidence of the attempted exploit?
- A. Log entry 4
- B. Log entry 3
- C. Log entry 1
- D. Log entry 2
Answer: A
Explanation:
Log entry 4 shows an attempt to exploit the zero-day command injection vulnerability by appending a malicious command (;cat /etc/passwd) to the end of a legitimate request (/cgi-bin/index.cgi?name=John). This command would try to read the contents of the /etc/passwd file, which contains user account information, and could lead to further compromise of the system. The other log entries do not show any signs of command injection, as they do not contain any special characters or commands that could alter the intended behavior of the application. Official Reference:
https://www.imperva.com/learn/application-security/command-injection/
https://www.zerodayinitiative.com/advisories/published/
NEW QUESTION # 345
An analyst views the following log entries:
The organization has a partner vendor with hosts in the 216.122.5.x range. This partner vendor is required to have access to monthly reports and is the only external vendor with authorized access. The organization prioritizes incident investigation according to the following hierarchy: unauthorized data disclosure is more critical than denial of service attempts.
which are more important than ensuring vendor data access.
Based on the log files and the organization's priorities, which of the following hosts warrants additional investigation?
- A. 121.19.30.221
- B. 134.17.188.5
- C. 216.122.5.5
- D. 202.180.1582
Answer: A
Explanation:
The correct answer is A. 121.19.30.221.
Based on the log files and the organization's priorities, the host that warrants additional investigation is
121.19.30.221, because it is the only host that accessed a file containing sensitive data and is not from the partner vendor's range.
The log files show the following information:
* The IP addresses of the hosts that accessed the web server
* The date and time of the access
* The file path of the requested resource
* The number of bytes transferred
The organization's priorities are:
* Unauthorized data disclosure is more critical than denial of service attempts
* Denial of service attempts are more important than ensuring vendor data access According to these priorities, the most serious threat to the organization is unauthorized data disclosure, which occurs when sensitive, protected, or confidential data is copied, transmitted, viewed, stolen, altered, or used by an individual unauthorized to do so123. Therefore, the host that accessed a file containing sensitive data and is not from the partner vendor's range poses the highest risk to the organization.
The file that contains sensitive data is /reports/2023/financials.pdf, as indicated by its name and path. This file was accessed by two hosts: 121.19.30.221 and 216.122.5.5. However, only 121.19.30.221 is not from the partner vendor's range, which is 216.122.5.x. Therefore, 121.19.30.221 is a potential unauthorized data disclosure threat and warrants additional investigation.
The other hosts do not warrant additional investigation based on the log files and the organization's priorities.
Host 134.17.188.5 accessed /index.html multiple times in a short period of time, which could indicate a denial of service attempt by flooding the web server with requests45. However, denial of service attempts are less critical than unauthorized data disclosure according to the organization's priorities, and there is no evidence that this host succeeded in disrupting the web server's normal operations.
Host 202.180.1582 accessed /images/logo.png once, which does not indicate any malicious activity or threat to the organization.
Host 216.122.5.5 accessed /reports/2023/financials.pdf once, which could indicate unauthorized data disclosure if it was not authorized to do so. However, this host is from the partner vendor's range, which is required to have access to monthly reports and is the only external vendor with authorized access according to the organization's requirements.
Therefore, based on the log files and the organization's priorities, host 121.19.30.221 warrants additional investigation as it poses the highest risk of unauthorized data disclosure to the organization.
NEW QUESTION # 346
A security analyst receives an alert for suspicious activity on a company laptop An excerpt of the log is shown below:
Which of the following has most likely occurred?
- A. A phishing link in an email was clicked
- B. A credential-stealing website was visited.
- C. A web browser vulnerability was exploited.
- D. An Office document with a malicious macro was opened.
Answer: D
Explanation:
An Office document with a malicious macro was opened is the most likely explanation for the suspicious activity on the company laptop, as it reflects the common technique of using macros to execute PowerShell commands that download and run malware. A macro is a piece of code that can automate tasks or perform actions in an Office document, such as a Word file or an Excel spreadsheet. Macros can be useful and legitimate, but they can also be abused by threat actors to deliver malware or perform malicious actions on the system. A malicious macro can be embedded in an Office document that is sent as an attachment in a phishing email or hosted on a compromised website. When the user opens the document, they may be prompted to enable macros or content, which will trigger the execution of the malicious code. The malicious macro can then use PowerShell, which is a scripting language and command-line shell that is built into Windows, to perform various tasks, such as downloading and running malware from a remote URL, bypassing security controls, or establishing persistence on the system. The log excerpt shows that PowerShell was used to download a string from a URL using the WebClient.DownloadString method, which is a common way to fetch and execute malicious code from the internet. The log also shows that PowerShell was used to invoke an expression (iex) that contains obfuscated code, which is another common way to evade detection and analysis. The other options are not as likely as an Office document with a malicious macro was opened, as they do not match the evidence in the log excerpt. A credential-stealing website was visited is possible, but it does not explain why PowerShell was used to download and execute code from a URL. A phishing link in an email was clicked is also possible, but it does not explain what happened after the link was clicked or how PowerShell was involved. A web browser vulnerability was exploited is unlikely, as it does not explain why PowerShell was used to download and execute code from a URL.
NEW QUESTION # 347
While configuring a SIEM for an organization, a security analyst is having difficulty correlating incidents across different systems. Which of the following should be checked first?
- A. Data normalization rules
- B. Behavioral correlation settings
- C. NTP configuration on each system
- D. If appropriate logging levels are set
Answer: C
NEW QUESTION # 348
An analyst has discovered the following suspicious command:
Which of the following would best describe the outcome of the command?
- A. Cross-site scripting
- B. Backdoor attempt
- C. Reverse shell
- D. Logic bomb
Answer: B
Explanation:
ThePHP script allows remote users to execute system commands via the system() function, meaning an attacker can send arbitrary commands to the server.
* Option A (Cross-site scripting - XSS)is incorrect because this script does not inject JavaScript into a webpage.
* Option B (Reverse shell)is possible if an attacker sends a crafted command, but the script itself is more of a general backdoor than a dedicated reverse shell.
* Option D (Logic bomb)is incorrect because a logic bomb is typicallytriggered by a specific event or daterather than executing arbitrary commands on demand.
Thus,C (Backdoor attempt) is the best answer, as this scriptgrants unauthorized remote command execution.
NEW QUESTION # 349
Which of the following is a circumstance in which a security operations manager would most likely consider using automation?
- A. The analysis of suspected malware binaries captured by an email gateway
- B. The generation of NIDS rules based on received STIX messages
- C. The verification of employee identities prior to initial PKI enrollment
- D. The fulfillment of privileged access requests to enterprise domain controllers.
Answer: B
NEW QUESTION # 350
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. Review logs to see whether this exploitable vulnerability has already impacted the company.
- B. Write a removable media policy that explains that USBs cannot be connected to a company asset.
- C. Conduct security awareness training on the risks of using unknown and unencrypted USBs.
- D. Check configurations to determine whether USB ports are enabled on company assets.
Answer: D
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 # 351
A security analyst obtained the following table of results from a recent vulnerability assessment that was conducted against a single web server in the environment:
Which of the following should be completed first to remediate the findings?
- A. Ask the web development team to update the page contents
- B. Perform proper sanitization on all fields
- C. Add the IP address allow listing for control panel access
- D. Purchase an appropriate certificate from a trusted root CA
Answer: B
Explanation:
The first action that should be completed to remediate the findings is to perform proper sanitization on all fields. Sanitization is a process that involves validating, filtering, or encoding any user input or data before processing or storing it on a system or application. Sanitization can help prevent various types of attacks, such as cross-site scripting (XSS), SQL injection, or command injection, that exploit unsanitized input or data to execute malicious scripts, commands, or queries on a system or application. Performing proper sanitization on all fields can help address the most critical and common vulnerability found during the vulnerability assessment, which is XSS.
NEW QUESTION # 352
A security analyst performs various types of vulnerability scans. Review the vulnerability scan results to determine the type of scan that was executed and if a false positive occurred for each device.
Instructions:
Select the Results Generated drop-down option to determine if the results were generated from a credentialed scan, non-credentialed scan, or a compliance scan.
For ONLY the credentialed and non-credentialed scans, evaluate the results for false positives and check the findings that display false positives. NOTE: If you would like to uncheck an option that is currently selected, click on the option a second time.
Lastly, based on the vulnerability scan results, identify the type of Server by dragging the Server to the results.
The Linux Web Server, File-Print Server and Directory Server are draggable.
If at any time you would like to bring back the initial state of the simulation, please select the Reset All button. When you have completed the simulation, please select the Done button to submit. Once the simulation is submitted, please select the Next button to continue.
Answer:
Explanation:
NEW QUESTION # 353
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