CS0-003 Exam Dumps - CompTIA CyberSecurity Analyst CySA+ Certification Exam

A distributed denial-of-service (DDoS) attack is a type of cyberattack that aims to overwhelm a target’s network or server with a large volume of traffic from multiple sources. A common technique for launching a DDoS attack is to compromise DNS servers, which are responsible for resolving domain names into IP addresses. By flooding DNS servers with malicious requests, attackers can disrupt the normal functioning of the internet and prevent users from accessing external SaaS resources. Official References: https://www.eccouncil.org/cybersecurity-exchange/threat-intelligence/cyber-kill-chain-seven-steps-cyberattack/

The first action that the analyst should take in this case is to clone the virtual server for forensic analysis. Cloning the virtual server involves creating an exact copy or image of the server’s data and state at a specific point in time. Cloning the virtual server can help preserve and protect any evidence or information related to the security incident, as well as prevent any tampering, contamination, or destruction of evidence. Cloning the virtual server can also allow the analyst to safely analyze and investigate the incident without affecting the original server or its operations.

The first and most urgent step to mitigate the impact of compromised credentials on the dark web is to perform a forced password reset for the affected user. This will prevent the cybercriminals from using the stolen credentials to access the company’s network and systems. Multifactor authentication is a good security measure, but it is not foolproof and can be bypassed by sophisticated attackers. Therefore, changing the password as soon as possible is the best practice to reduce the risk of a data breach or other cyber attack123 References: 1: How to monitor the dark web for compromised employee credentials 2: How to prevent corporate credentials ending up on the dark web 3: Data Breach Prevention: Identifying Leaked Credentials on the Dark Web

The signature of the malware is a unique identifier that can be used to compare it with known malware samples and their behaviors. Open-source threat intelligence sources provide information on various types of malware, their indicators of compromise, and their mitigation strategies. By cross-referencing the signature with these sources, the analyst can determine the type of malware and its telemetry. The other options are not relevant for this purpose: configuring the EDR to perform a full scan may not provide additional information on the malware type; transferring the malware to a sandbox environment may expose the analyst to further risks; logging in to the affected systems and running netstat may not reveal the malware activity.

The best action that the SOC manager can recommend to help ensure new employees are accountable for following the company policy is to require all new employees to sign a user agreement to acknowledge the company security policy. A user agreement is a document that defines the rights and responsibilities of the users regarding the use of the company’s systems, networks, or resources, as well as the consequences of violating the company’s security policy. Signing a user agreement can help ensure new employees are aware of and agree to comply with the company security policy, as well as hold them accountable for any breaches or incidents caused by their actions or inactions.

Incident response playbooks are preplanned, step-by-step procedures used to respond consistently and effectively to specific incident types. Their importance is that they provide tactical guidance during stressful situations, particularly in the early hours, to ensure a measured, repeatable response that reduces impact and supports recovery.

The Sybex CySA+ Study Guide directly defines what playbooks are and why they matter:

Exact extract (Sybex Study Guide):

“CSIRT teams often develop playbooks that describe the specific procedures that they will follow in the event of a specific type of cybersecurity incident.”

It also explains the practical purpose: responders can use them as an operational plan, especially early in response:

Exact extract (Sybex Study Guide):

“The idea behind the playbook is that the team should be able to pick it up and find an operational plan for responding to the security incident that they may follow. Playbooks are especially important in the early hours of incident response…”

The Secbay Press CS0-003 guide reinforces that playbooks are step-by-step instructions and that they streamline response and ensure consistency:

Exact extract (Secbay Press):

“Creation of incident response playbooks detailing step-by-step instructions for responding to common types of security incidents. Playbooks streamline response efforts and ensure consistency across incidents.”

Therefore, Option D is the best answer because it matches the step-by-step, preplanned nature of playbooks and their goal of minimizing impact and supporting restoration/recovery.

Why the other options are not best:

A: Compliance alignment is not the primary function of IR playbooks; playbooks are operational response guides.

B: Preventing incidents is more about security controls/hardening; playbooks are for responding when incidents occur.

C: Metrics/KPIs and lessons learned are part of post-incident improvement, but playbooks aren’t primarily “baseline requirements for monitoring.” They’re response procedures.

References (CompTIA CySA+ CS0-003 documents / study guides used):

Mike Chapple & David Seidl, CompTIA CySA+ Study Guide (CS0-003): playbooks describe specific procedures; operational plan; importance early in incident response

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): playbooks are step-by-step instructions; streamline response; ensure consistency

When two vulnerabilities are both high severity (CVSS 8.1 and 8.5) and no compensating controls exist, the deciding factor for remediation prioritization becomes business impact and asset criticality/value (what matters most to the organization if compromised or taken offline for remediation).

That is exactly what a Business Impact Analysis (BIA) is used for: it is a formalized method to determine asset criticality/value designations and to prioritize response/remediation work based on business impact.

Supporting exact extracts:

The Secbay Press CS0-003 guide explicitly states that Business Impact Analysis is used to align vulnerability prioritization with critical business functions:Exact extract (Secbay Press): “Business Impact Analysis: … Considers the potential impact of vulnerabilities on critical business functions … prioritizing vulnerabilities that could impact core business processes.”

It also describes the vulnerability prioritization process as combining severity/exploitability with asset criticality assessment (which is informed by business owners and BIA outputs):Exact extract (Secbay Press): “Asset Criticality Assessment: Evaluate the criticality of assets affected… Consider the importance of assets in business operations, data sensitivity, and regulatory compliance.”

The All-in-One CS0-003 guide reinforces that asset value (sensitivity + criticality) is one of the most important drivers of remediation timing/prioritization:Exact extract (All-in-One Exam Guide): “Asset value is… one of the most important factors in determining how quickly you should remediate vulnerabilities…” and asset value is tied to “sensitivity and criticality.”

Applying this to the scenario

HQFIN01 supports financial transactions for the largest business unit → typically extremely high criticality (availability) and often high sensitivity/integrity requirements.

HQADMIN02 is used by a privileged user and could be high risk too (admin access), but the question asks what the team would do to determine prioritization: the correct step is to reference BIA/value designation and then prioritize based on which asset is more critical to business operations.

Why the other options are incorrect

A (Review BCP and patch what takes longer to bring online): BCP/DR planning is not the primary method for vulnerability remediation ranking; prioritization is risk-based and commonly driven by asset criticality/business impact (BIA), not “time to bring online.”

B (Fix the faster one first): Speed of remediation is not the main driver; risk reduction and business impact are.

D (Least recent backups): Backup recency matters for recovery and resilience, but it’s not the primary determinant for vulnerability remediation priority versus asset criticality and business impact.

References (CompTIA CySA+ CS0-003 documents / study guides used):

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): BIA used to prioritize vulnerabilities impacting critical business functions; asset criticality assessment in prioritization process

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): asset value (sensitivity + criticality) drives how quickly vulnerabilities should be remediated

Quarantining the server is the best action to perform immediately, as it isolates the affected server from the rest of the network and prevents the ransomware from spreading to other systems or data. Quarantining the server also preserves the evidence of the ransomware attack, which can be useful for forensic analysis and law enforcement investigation. The other actions are not as urgent as quarantining the server, as they may not stop the ransomware infection, or they may destroy valuable evidence. Shutting down the server may not remove the ransomware, and it may trigger a data deletion mechanism by the ransomware. Reimaging the server may restore its functionality, but it will also erase any traces of the ransomware and make recovery of encrypted data impossible. Updating the OS to the latest version may fix some vulnerabilities, but it will not remove the ransomware or decrypt the data. Official References:

https://www.cisa.gov/stopransomware/ransomware-guide

https://www.cisa.gov/sites/default/files/publications/Ransomware_Executive_One-Pager_and_Technical_Document-FINAL.pdf

https://www.cisa.gov/stopransomware/ive-been-hit-ransomware