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

Mitigate is the best term to describe the risk management principle that the company is exercising, as it means to reduce the likelihood or impact of a risk. By implementing a patch management program to remediate vulnerabilities, the company is mitigating the threat of cyberattacks that could exploit those vulnerabilities and compromise the security or functionality of the systems. The other terms are not as accurate as mitigate, as they describe different risk management principles. Transfer means to shift theresponsibility or burden of a risk to another party, such as an insurer or a contractor. Accept means to acknowledge the existence of a risk and decide not to take any action to reduce it, usually because the risk is low or the cost of mitigation is too high. Avoid means to eliminate the possibility of a risk by changing the plans or activities that could cause it, such as cancelling a project or discontinuing a service.

To “test” links/attachments before they reach the mail server, the organization needs a control that can execute or detonate suspicious content in a controlled environment and observe behavior. That is exactly what sandboxing does.

Secbay Press defines sandboxing as executing suspicious files/applications in a virtualized environment to observe behavior (i.e., safe testing/detonation):

Exact extract (Secbay Press): “Joe Sandbox is a malware analysis platform that utilizes virtualized environments (sandboxing) to execute and observe the behavior of suspicious files or applications.”

The official CS0-003 objectives list Sandboxing (Joe Sandbox / Cuckoo Sandbox) under tools used to determine malicious activity, aligning with the exam’s expectation that sandboxing is used to analyze suspicious content.

Why the other choices are not correct:

B (MFA): helps protect accounts, but doesn’t “test” attachments/links.

C (DKIM): authenticates sender domain and message integrity, but doesn’t detonate or test payloads.

D (Vulnerability scan): targets hosts/services/configurations, not real-time detonation of email attachments/links.

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

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): sandboxing executes/observes suspicious files in a virtualized environment

CompTIA CySA+ CS0-003 Exam Objectives v4.0: includes sandboxing tools (Joe Sandbox, Cuckoo Sandbox)

Chapple/Seidl, CompTIA CySA+ Study Guide (CS0-003): DKIM is for verifying sender/domain integrity, not payload testing

The correct answer is D. MITRE ATT & CK.

MITRE ATT & CK is a framework that maps the tactics, techniques, and procedures (TTPs) of various threat actors and groups, based on real-world observations and data. MITRE ATT & CK can help a Chief Information Security Officer (CISO) to map all the attack vectors that the company faces each day, as well as to align their security controls around the most relevant and prevalent threats. MITRE ATT & CK can also help the CISO to assess the effectiveness and maturity of their security posture, as well as to identify and prioritize the gaps and improvements .

The other options are not the best recommendations for mapping all the attack vectors that the company faces each day. OSSTMM (Open Source Security Testing Methodology Manual) (A) is a methodology that provides guidelines and best practices for conducting security testing and auditing, but it does not map the TTPs of threat actors or groups. Diamond Model of Intrusion Analysis (B) is a model that analyzes the relationships and interactions between four elements of an intrusion: adversary, capability, infrastructure, and victim. The Diamond Model can help understand the characteristics and context of an intrusion, but it does not map the TTPs of threat actors or groups. OWASP (Open Web Application Security Project) © is a project that provides resources and tools for improving the security of web applications, but it does not map the TTPs of threat actors or groups.

The question asks for the best technical method to protect sensitive data at an organizational level. Among the options, Data Loss Prevention (DLP) is explicitly a technical control category designed to prevent sensitive data leakage/exfiltration across the organization, especially at network boundaries (egress points) and via endpoints.

Why DLP (Option D) is best:

DLP is built specifically to stop sensitive data from leaving where it should be contained (data exfiltration/leakage prevention) and can be applied broadly across the enterprise (network + endpoints). The Sybex CySA+ Study Guide defines DLP this way:Exact extract (Sybex Study Guide): “DLP systems and software work to protect data from leaving the organization…”

DLP is commonly implemented at network egress points (and also endpoints), which aligns directly with “egress and ingress” monitoring in the option wording. The Secbay Press guide reinforces this deployment model:Exact extract (Secbay Press): “Network DLP… Installed at network egress points near the perimeter”

DLP is also a key technique to help detect/prevent data exfiltration, which is a major concern for sensitive data protection programs:Exact extract (All-in-One Exam Guide): “Implement DLP tools to detect and prevent sensitive data from being transferred outside the organization.”

Finally, DLP is explicitly part of the CS0-003 exam objectives under Sensitive data protection, making it the most “officially aligned” technical method in the answer choices:Exact extract (CompTIA CS0-003 Objectives): “Sensitive data protection – Data loss prevention (DLP)”

Why the other options are not “best”:

A (Block port 8080 / VLAN): Too narrow and mis-scoped. Port-based blocking doesn’t reliably stop sensitive data movement (data could leave on 443/HTTPS, email, cloud apps, etc.). Also, “traffic on port 8080 with sensitive information” is not how traffic filtering is normally expressed and isn’t an enterprise-wide sensitive data protection strategy.

B (Python script for email PII): Helpful as a tactical control, but limited to email only, brittle to evasion/encryption, and not an enterprise-wide standardized control like DLP. (Also corrected typo: “Pll” → PII.)

C (Restrictive policy): A policy is an administrative/managerial control, not a technical method. The question explicitly asks for the best technical method.

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

CompTIA CySA+ CS0-003 Exam Objectives (v4.0): Sensitive data protection includes DLP

Mike Chapple & David Seidl, CompTIA CySA+ Study Guide (CS0-003): DLP “protect[s] data from leaving the organization…”

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): Network DLP at egress points

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): DLP helps “detect and prevent sensitive data” transfer outside

The correct answer is B because a legal hold requires the organization to preserve potentially relevant information. The first practical step is to notify the departments, custodians, IT staff, and records personnel who may control or possess relevant emails so they do not delete, alter, or overwrite them.

Exact supporting extract: the Secbay CySA+ guide defines legal hold as a process used to preserve relevant information associated with legal proceedings, investigations, or disputes. It states that once a legal hold is in effect, it is crucial to communicate it to relevant personnel who may have custody or control over the information, including IT staff, records management personnel, and employees with pertinent data.

The Sybex CySA+ Study Guide also states that legal holds require organizations to preserve all potentially relevant data and information related to pending or active litigation. It specifically notes that legal holds may involve data such as logs, email, or transactional information that would otherwise be destroyed under normal retention procedures.

Why the other options are incorrect:

A is incorrect because disclosing the request to unrelated vendors could create confidentiality and legal issues.

C is incorrect because chain of custody is important when evidence is collected and transferred, but the first legal-hold step is preservation notification.

D is incorrect because producing mailbox copies to the attorney is premature. The organization must first preserve the relevant data and follow legal/eDiscovery procedures.

Comprehensive and Detailed Step-by-Step Explanation:Performing a vulnerability scan during the recovery phase ensures that corrective actions, such as patches or configuration changes, have effectively addressed the vulnerabilities exploited during the incident. This step validates the system’s security before fully restoring operations.

The Command and Control stage of the Cyber Kill Chain describes the communication between the attacker and the compromised system. The attacker may use this channel to send commands, receive data, or update malware. If the analyst discovers unusual outbound connections to an IP that was previously blocked, it may indicate that the attacker has established a command and control channel and bypassed the security controls. References: Cyber Kill Chain® | Lockheed Martin

Isolation is the first step to take after detecting some indicators of compromise (IoCs) of possible ransomware contamination. Isolation prevents the ransomware from spreading to other servers or segments of the network, and allows the security team to investigate and contain the incident. Isolation can be done by disconnecting the infected servers from the network, blocking the malicious traffic, or applying firewall rules12.

The first step should be to perform a public search for malware reports on taskhw.exe, as this file is suspicious for several reasons: it is located in a non-standard path, it has a high CPU usage, it is signed by an unknown entity, and it is only present on one host. A public search can help to determine if this file is a known malware or a legitimate program. If it is malware, the hunter can then take appropriate actions to remove it and prevent further damage. The other options are either premature or ineffective, as they do not provide enough information to assess the threat level of taskhw.exe. References: Cybersecurity Analyst+ - CompTIA, taskhw.exe Windows process - What is it? - file.net, Taskhostw.exe - What Is Taskhostw.exe & Is It Malware? - MalwareTips Forums

The vulnerability scan shows that the version information is visible in the http-server-header, which can be exploited by attackers to identify vulnerabilities specific to that version. Removing or obfuscating this information can enhance security.