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The results of a risk assessment would best enable an informed decision by senior management when developing a business case to justify an information security investment. A risk assessment will help to identify and prioritize the threats and vulnerabilities that affect the organization’s assets and processes, as well as the potential impact and likelihood of occurrence. A risk assessment will also provide a basis for selecting and evaluating the effectiveness of controls to mitigate the risks. According to CISA, developing a business case for security will be based on an in-depth understanding of organizational vulnerabilities, operational priorities, and return on investment1. The information security strategy, losses due to security incidents, and security investment trends in the industry are possible inputs or outputs of a risk assessment, but they are not sufficient to enable an informed decision by senior management. References: 1: The Business Case for Security - CISA 2: The Business Case for Security | CISA 3: #HowTo: Build a Business Case for Cybersecurity Investment 4: Making the Business Case for Information Security

 The best way to ensure the capability to restore clean data after a ransomware attack is to maintain multiple offline backups. Offline backups are backups that are not connected to the network or the internet, and therefore are not accessible by ransomware. Multiple offline backups provide redundancy and allow the organization to choose the most recent and uncorrupted backup to restore the data. Offline backups should be stored in a secure location and tested regularly to ensure their integrity and availability.

Purchasing cyber insurance may help the organization cover some of the costs associated with a ransomware attack, such as ransom payment, data recovery, legal fees, etc., but it does not guarantee the capability to restore clean data. Cyber insurance policies may have exclusions, limitations, or conditions that affect the coverage and reimbursement. Moreover, cyber insurance does not prevent or mitigate the ransomware attack itself, and it may not cover all the losses or damages caused by the attack.

Encrypting sensitive production data may protect the confidentiality of the data from unauthorized access or disclosure, but it does not prevent ransomware from encrypting the data again. Ransomware does not need to decrypt the data to encrypt it, and it may use a different encryption algorithm or key than the one used by the organization. Encrypting production data may also increase the complexity and time required for data recovery, especially if the encryption keys are lost or compromised.

Performing integrity checks on backups may help the organization verify that the backups are not corrupted or tampered with, but it does not ensure the capability to restore clean data after a ransomware attack. Integrity checks are a preventive measure that should be done before the attack, not after. If the backups are already infected or encrypted by ransomware, performing integrity checks will not help to recover the data. Integrity checks should be complemented by other measures, such as isolation, versioning, and offline storage, to protect the backups from ransomware. References = CISM Certified Information Security Manager Study Guide, Chapter 9: Business Continuity and Disaster Recovery, page 3081; CISM Foundations: Module 4 Course, Part Two: Business Continuity and Disaster Recovery Plans2; Ransomware recovery: 8 steps to successfully restore from backup3; Ransomware Recovery: 5 Steps to Recover Data4

 The primary purpose of business continuity and disaster recovery plans is to ensure that the organization can resume its critical business functions within the stated recovery time objectives (RTOs) after a disruptive event. RTOs are based on the business needs and the impact analysis of each function or process. Therefore, meeting the business needs is the best indicator that the plans are effective. Regulatory requirements, internal compliance requirements, and risk management objectives are important factors that influence the development and testing of the plans, but they are not the ultimate measure of their effectiveness. References = CISM Certified Information Security Manager Study Guide, Chapter 9: Business Continuity and Disaster Recovery, page 3071; CISM Foundations: Module 4 Course, Part Two: Business Continuity and Disaster Recovery Plans2; Imperva, Business Continuity & Disaster Recovery Planning (BCP & DRP)3

A threat analysis will best identify the external influences to an organization’s information security because it involves identifying and evaluating the sources and likelihood of potential adverse events that could affect the organization’s assets, operations, or reputation. External influences include factors such as emerging technologies, social media, business environment, risk tolerance, regulatory requirements, third-party considerations, and threat landscape1. A threat analysis can help the organization to align its information security strategy with its business objectives and risk appetite, and to prioritize and mitigate the most relevant and impactful threats. A business impact analysis (BIA) is a process of assessing the potential consequences of a disruption to the organization’s critical business functions or processes. A BIA does not directly identify the external influences to the organization’s information security, but rather the impact of those influences on the organization’s continuity and recovery. A gap analysis is a process of comparing the current state of the organization’s information security with a desired or expected state, based on best practices, standards, or frameworks. A gap analysis does not directly identify the external influences to the organization’s information security, but rather the areas of improvement or compliance. A vulnerability analysis is a process of identifying and evaluating the weaknesses or flaws in the organization’s information systems or processes that could be exploited by threats. A vulnerability analysis does not directly identify the external influences to the organization’s information security, but rather the exposure or susceptibility of the organization to those influences. References = CISM Review Manual, 15th Edition, pages 22-232; CISM Exam Content Outline, Domain 1, Knowledge Statement 1.113

Threat analysis is a process that is used to identify and assess the external influences or threats that could potentially affect an organization's information security. It is used to identify potential risks and develop strategies to mitigate or reduce those risks. Threat analysis involves analyzing the environment, identifying potential threats and their potential impacts, and then evaluating the organization's current security measures and developing strategies to address any deficiencies.