The best way to test for the existence of backdoors in a mission-critical business application that was outsourced to a third-party developer is to perform security code reviews on the entire application. A backdoor is a hidden or undocumented feature or function in a software application that allows unauthorized or remote access, control, or manipulation of the application or the system it runs on. Backdoors can be intentionally or unintentionally introduced by the developers, or maliciously inserted by the attackers, and they can pose serious security risks and threats to the organization and its data. Security code reviews are the process of examining and analyzing the source code of a software application to identify and eliminate any security vulnerabilities, flaws, or weaknesses, such as backdoors, that may compromise the functionality, performance, or integrity of the application or the system. Security code reviews can be performed manually by the security experts, or automatically by the security tools, or both, and they can be done at different stages of the software development life cycle, such as design, coding, testing, or deployment. Security code reviews can help to detect and remove any backdoors in the application before they can be exploited by the attackers, and they can also help to improve the quality, reliability, and security of the application.
References = CISM Review Manual, 16th Edition, Chapter 3: Information Security Program Development and Management, Section: Information Security Program Development, page 1581; CISM Review Questions, Answers & Explanations Manual, 10th Edition, Question 87, page 812; CISM ITEM DEVELOPMENT GUIDE, page 63.

A balanced scorecard is a tool that can be used to demonstrate the added value of an information security program by measuring and reporting on key performance indicators (KPIs) and key risk indicators (KRIs) aligned with strategic objectives. Security baselines, a gap analysis and a SWOT analysis are all useful for assessing and improving security posture, but they do not necessarily show how security contributes to business value.

Restoring the system from a known good backup is the most appropriate eradication method when responding to an incident resulting in malware on an application server, as it ensures that the system is free of any malicious code and that the data and applications are consistent with the expected state. Disconnecting the system from the network may prevent further spread of the malware, but it does not eradicate it from the system. Changing passwords on the compromised system may reduce the risk of unauthorized access, but it does not remove the malware from the system. Performing operation system hardening may improve the security configuration of the system, but it does not guarantee that the malware is eliminated from the system.
References = CISM Review Manual 2022, page 3131; CISM Exam Content Outline, Domain 4, Task 4.4

Including the impact of the risk as part of regular metrics is the best way for the information security manager to help senior management understand the related risk of having many user workstations with unpatched versions of software because it quantifies and communicates the potential consequences and likelihood of such a risk in terms of business objectives and performance indicators. Recommending the security steering committee conduct a review is not a good way because it does not provide any specific information or analysis about the risk or its impact. Updating the risk assessment at regular intervals is not a good way because it does not ensure that senior management is aware or informed about the risk or its impact. Sending regular notifications directly to senior managers is not a good way because it may be perceived as intrusive or annoying, and may not convey the severity or urgency of the risk or its impact. References: https://www.isaca.
org/resources/isaca-journal/issues/2015/volume-6/measuring-the-value-of-information-security-investments
https://www.isaca.org/resources/isaca-journal/issues/2017/volume-3/how-to-measure-the-effectiveness-of- your-information-security-management-system

Engaging stakeholders is the most important step when developing an information security strategy, as it ensures that the strategy is aligned with the business objectives, risks, and needs of the organization.
Stakeholders include senior management, business units, IT staff, customers, regulators, and other relevant parties who have an interest or influence on the information security of the organization. By engaging stakeholders, the information security manager can gain their support, input, feedback, and buy-in for the strategy, as well as identify and prioritize the security requirements, expectations, and challenges.
References = CISM Review Manual, 27th Edition, Chapter 4, Section 4.1.1, page 2131; CISM Online Review Course, Module 4, Lesson 1, Topic 1