Pass the CompTIA CompTIA CySA+ CS0-003 Questions and answers with CertsForce

Thegoal of forensic analysisin a post-incident scenario is to identify theroot causeof the incident. This helps prevent future occurrences and enhances the security posture of the organization​.

Option A (Full picture of risks)is more aligned with a risk assessment rather than forensic analysis.

Option B (Notifying law enforcement)depends on the situation, but forensic analysis is performed even when legal action is not involved.

Option C (Further containment)is part of incident response, but forensic analysis happensaftercontainment.

Thus,D is the correct answer, asdetermining root cause is the key objective of forensic analysis​.

The Diamond Model of Intrusion Analysis is a framework that describes the relationship between four components of a cyberattack: adversary, capability, infrastructure, and victim. It helps analysts understand the behavior and motivation of threat actors, as well as the tools and methods they use to compromise their targets12. References: Main Analytical Frameworks for Cyber Threat Intelligence, section 4; Strategies, tools, and frameworks for building an effective threat intelligence team, section 3.

Business process interruption is the inhibitor to remediation that this scenario illustrates. Business process interruption is when the remediation of a vulnerability or an incident requires the disruption or suspension of a critical or essential business process, such as the point-of-sale application. This can cause operational, financial, or reputational losses for the organization, and may outweigh the benefits of the remediation. Therefore, the organization may decide to postpone or avoid the remediation until a more convenient time, such as a change freeze window, which is a period of time when no changes are allowed to the IT environment12. Service-level agreement, degrading functionality, and proprietary system are other possible inhibitors to remediation, but they are not relevant to this scenario. Service-level agreement is when the remediation of a vulnerability or an incident violates or affects the contractual obligations or expectations of the service provider or the customer. Degrading functionality is when the remediation of a vulnerability or an incident reduces or impairs the performance or usability of a system or an application. Proprietary system is when the remediation of a vulnerability or an incident involves a system or an application that is owned or controlled by a third party, and the organization has limited or no access or authority to modify it3. References: Inhibitors to Remediation — SOC Ops Simplified, Remediation Inhibitors - CompTIA CySA+, Information security Vulnerability Management Report (Remediation…

The behavior described is a high-level objective: gain unauthorized access to a vulnerable system. In MITRE ATT & CK, tactics represent the attacker’s high-level goals (the “why”), such as gaining initial access. That makes this observation a tactic-level description rather than a technique/procedure.

The All-in-One CS0-003 guide defines tactics as high-level goals and explicitly includes “gaining initial access” as an example:Exact extract (All-in-One Exam Guide): “Tactics The high-level goals attackers are trying to achieve, such as gaining initial access, persistence, or exfiltrating data.”

It also describes Initial access as the goal of gaining a foothold (i.e., unauthorized access) into a target system/network:Exact extract (All-in-One Exam Guide): “Initial access. Tactics used by attackers to gain a foothold within a target network or system…”

Why the other options are not correct:

B (Techniques): Techniques are the specific methods used to accomplish a tactic (the “how”), not the high-level goal itself.Exact extract (All-in-One Exam Guide): “Techniques The specific methods and procedures attackers use to achieve their goals.”

A (Procedures): Procedures are the step-by-step sequences for executing techniques (an attacker’s “attack playbook”), not the high-level goal statement.

D (Subtechniques): Subtechniques are more granular breakdowns under a technique; your statement doesn’t describe a specific technique, so it can’t be placed at the subtechnique level.

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

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): tactics are high-level goals (e.g., gaining initial access); initial access definition; techniques definition; procedures as step-by-step sequences

The first step in building a disaster recovery plan (DRP) for critical on-prem applications is to determine what is actually “critical” to the business, how long the organization can tolerate those applications being down, and therefore what restoration order (prioritization) is required. That prioritization must come from business/data owners and stakeholders, because they understand operational dependencies, business impact, and acceptable downtime.

This is essentially the start of a Business Impact Analysis (BIA) and related continuity prioritization work, which precedes choices like vendors, contracts, or site geography. You don’t select a DR site/vendor or negotiate agreements until you know which systems must be restored first and what recovery objectives you must meet.

Supporting exact extracts:

The All-in-One CS0-003 guide explains that the foundation is identifying critical systems and determining tolerable outage time (used to prioritize restoration):Exact extract (All-in-One Exam Guide): “The key is to determine which of the organization’s critical systems are needed for survival and then estimate the outage time that can be tolerated by the organization…” It then connects those determinations directly to prioritization:Exact extract (All-in-One Exam Guide): “These estimates will help you determine how to prioritize response team efforts to restore these assets.”

The Secbay Press CS0-003 guide lays out the early BIA/risk identification steps in order, starting with identifying what’s critical before recovery priorities:Exact extract (Secbay Press): “1. Identify critical processes and resources2. Identify outage impacts and estimate downtime3. Identify resource requirements4. Identify recovery priorities”

Why the other options are not the first step:

A / C (vendor selection / vendor agreements): those come after requirements are defined (RTO/MTD, criticality, order of restoration).

D (define geographic area): location considerations are important, but they are driven by requirements and constraints discovered during BIA/continuity prioritization (what needs to be recovered, how fast, and with what dependencies).

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

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): determine critical systems and tolerable outage time; used to prioritize restoration

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): BIA / risk identification process steps (identify critical processes/resources → estimate downtime → recovery priorities)

Reviewing the code and debugging the code are two methods that can help a developer identify and fix runtime errors in the code. Reviewing the code involves checking the syntax, logic, and structure of the code for any errors or inconsistencies. Debugging the code involves running the code in a controlled environment and using tools such as breakpoints, watches, and logs to monitor the execution and find the source of errors. Both methods can help improve the quality and security of the code. 

The correct answer is C. Impact.

The impact metric is the best way to measure the degree to which a system, application, or user base is affected by an uptime availability outage. The impact metric quantifies the consequences of the outage in terms of lost revenue, productivity, reputation, customer satisfaction, or other relevant factors. The impact metric can help prioritize the recovery efforts and justify the resources needed to restore the service1.

The other options are not the best ways to measure the degree to which a system, application, or user base is affected by an uptime availability outage. The timeline metric (A) measures the duration and frequency of the outage, but not its effects. The evidence metric (B) measures the sources and types of data that can be used to investigate and analyze the outage, but not its effects. The scope metric (D) measures the extent and severity of the outage, but not its effects.

The key phrase is “analyzes suspicious data after scanning”. Before you can prioritize remediation, you must first ensure the scan results are valid—i.e., determine whether the findings are true positives vs. false positives. That validation step is a core part of vulnerability management because it prevents wasting time remediating issues that do not actually exist and ensures your prioritization decisions are based on accurate findings.

The All-in-One CySA+ CS0-003 guide explicitly states that after receiving vulnerability scan data, the analyst’s review process must focus on validating reported vulnerabilities (true/false positives). It also directly ties this to remediation/prioritization.

Exact extract (All-in-One Exam Guide):

“It is up to the analyst to review and make sense of vulnerability data and findings… The two most important outcomes of the review process are to determine the validity of reported vulnerabilities…”

It further emphasizes the importance of differentiating true positives from false positives for remediation and prioritization:

Exact extract (All-in-One Exam Guide):

“Distinguishing true positives from false positives… can be a tricky part of vulnerability remediation and prioritization.”

So, Option B (determine true/false positives) is the best action specifically to prioritize remediation tasks based on scan results.

Why the other options are not best:

A: Sending to IR may be appropriate if there is evidence of an active incident, but the question is framed as post-scan vulnerability management (not confirmed incident handling). Validation comes first.

C: Tickets and timeframes are important (often driven by SLAs/SLOs), but setting those correctly depends on confirming the findings are real and understanding severity/impact first.

D: Compensating controls and risk register entries are appropriate when remediation is not immediately feasible, but again you must confirm validity and then prioritize based on risk/impact.

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

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): validating vulnerability scan results; true/false positives; link to remediation prioritization

The correct answer is B. Replace the current MD5 with SHA-256.

The vulnerability that the security analyst is able to exploit is a hash collision, which is a situation where two different files produce the same hash value. Hash collisions can allow an attacker to bypass the integrity or authentication checks that rely on hash values, and submit malicious files to the system. The web application uses MD5, which is a hashing algorithm that is known to be vulnerable to hash collisions. Therefore, the analyst should suggest replacing the current MD5 with SHA-256, which is a more secure and collision-resistant hashing algorithm.

The other options are not the best suggestions to mitigate the vulnerability with the fewest changes to the current script and infrastructure. Deploying a WAF (web application firewall) to the front of the application (A) may help protect the web application from some common attacks, but it may not prevent hash collisions or detect malicious files. Deploying an antivirus application on the hosting system © may help scan and remove malicious files from the system, but it may not prevent hash collisions or block malicious files from being submitted. Replacing the MD5 with digital signatures (D)may help verify the authenticity and integrity of the files, but it may require significant changes to the current script and infrastructure, as digital signatures involve public-key cryptography and certificate authorities.

A rollback had been executed on the instance. If a database server is restored to a previous state, it may reintroduce a vulnerability that was previously fixed. This can happen due to backup and recovery operations, configuration changes, or software updates. A rollback can undo the patching or mitigation actions that were applied to remediate the vulnerability. References: Vulnerability Remediation: It’s Not Just Patching, Section: The Remediation Process; Vulnerability assessment for SQL Server, Section: Remediation