The best course of action to address the risk associated with data transfer if the relationship is terminated with the vendor is to ensure the language in the contract explicitly states who is accountable for each step of the data transfer process. This can help to avoid ambiguity, confusion, or disputes over the ownership, responsibility, and liability of the data and the data transfer process. Meeting with the business leaders, collecting requirements, and working with the information security officer are important activities, but they are not as effective as ensuring the contractual agreement is clear and enforceable. References = ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, question 4; CRISC Review Manual, 6th Edition, page 153.

Updating the risk register to include outcomes from a risk assessment is the greatest benefit because it enables the organization to prioritize and respond to the most significant risks in a timely manner. The risk register is a tool that records and tracks the current status of risks, their likelihood, impact, and response strategies. By updating the risk register with the results of a risk assessment, the organization can ensure that the risk information is accurate, relevant, and actionable. Maintaining evidence of compliance with risk policy, validating the organization's risk appetite, and helping to mitigate internal and external risk factors are all possible benefits of updating the risk register, but they are not the greatest benefit, as they do not directly support risk-based decision making. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.2.1, page 83

A treatment plan status is a report that shows the current status and progress of the risk mitigation actions and activities that are implemented to reduce the risk exposure of the organization. A treatment plan status would provide the most useful information to a risk owner when reviewing the progress of risk mitigation, as it can help to monitor and evaluate the performance and effectiveness of the risk controls, and to identify and address any issues or gaps that may arise during the implementation. A treatment plan status can also provide feedback and information to the risk owners and stakeholders, and enable them to adjust the risk strategy and response actions accordingly. References = CRISC: Certified in Risk & Information Systems Control Sample Questions, Question 257. CRISC Sample Questions 2024, Question 257. ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, Question 257. CRISC by Isaca Actual Free Exam Q&As, Question 9.

The most important information to include when reporting the effectiveness of risk management to senior management is the changes in residual risk levels against acceptable levels, as it indicates how well the risk management process and activities have reduced the risk exposure and impact to the level that is aligned with the risk tolerance and appetite of the organization. The other options are not the most important information, as they are more related to the drivers, factors, or outcomes of risk management, respectively, rather than the effectiveness or value of risk management. References = CRISC Review Manual, 7th Edition, page 109.

The most effective way to resolve the situation and define a comprehensive risk treatment plan would be to perform a root cause analysis. A root cause analysis is a method of identifying and addressing the underlying factors or causes that led to the occurrence of a problem or incident1. In this case, the problem or incident is the malware infection that affected the organization. By performing a root cause analysis, the organization can determine how and why the malware was able to infect the systems, what vulnerabilities or weaknesses were exploited, what controls or processes failed or were missing, and what actions or decisions contributed to the situation. A root cause analysis can help the organization to prevent or reduce the recurrence of similar incidents, as well as to improve the effectiveness and efficiency of the risk management process. A root cause analysis can also help the organization to define a comprehensive risk treatment plan, which is a set of actions or measures that are taken to modify the risk, such as reducing, avoiding, transferring, or accepting the risk2.
Based on the findings and recommendations of the root cause analysis, the organization can select and implement the most appropriate risk treatment option for the malware risk, as well as for any other related or emerging risks. The risk treatment plan should also include the roles and responsibilities, resources, timelines, and performance indicators for the risk treatment actions3. The other options are not the most effective ways to resolve the situation and define a comprehensive risk treatment plan, as they are either less thorough or less relevant than a root cause analysis. A gap analysis is a method of comparing the current state and the desired state of a process, system, or organization, and identifying the gaps or differences between them4. A gap analysis can help the organization to identify the areas of improvement or enhancement, as well as the opportunities or challenges for achieving the desired state. However, a gap analysis is not the most effective way to resolve the situation and define a comprehensive risk treatment plan, as it does not address the causes or consequences of the malware infection, or the actions or measures to mitigate the risk. An impact assessment is a method of estimating the potential effects or consequences of a change, decision, or action on a process, system, or organization5. An impact assessment can help the organization to evaluate the benefits and costs, as well as the risks and opportunities, of a proposed or implemented change, decision, or action.
However, an impact assessment is not the most effective way to resolve the situation and define a comprehensive risk treatment plan, as it does not investigate the origin or nature of the malware infection, or the solutions or alternatives to manage the risk. A vulnerability assessment is a method of identifying and analyzing the weaknesses or flaws in a process, system, or organization that can be exploited by threats to cause harm or loss6. A vulnerability assessment can help the organization to discover and prioritize the vulnerabilities, as well as to recommend and implement the controls or measures to reduce or eliminate them.
However, a vulnerability assessment is not the most effective way to resolve the situation and define a comprehensive risk treatment plan, as it does not consider the root causes or impacts of the malware infection, or the risk treatment options or plans to address the risk. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 2, Section 2.1.8, Page 61.