Isaca CISA Based on Real Exam Environment

Allowing only corporate IM solutions is the best control to mitigate the malware risk associated with an IM system, because it can prevent unauthorized or malicious IM applications from accessing the network and infecting the system with malware. Corporate IM solutions can also enforce security policies and standards, such as encryption, authentication, and logging, to protect the IM system from malware attacks. Blocking attachments in IM, blocking external IM traffic, and encrypting IM traffic are also possible controls to mitigate the malware risk, but they are not as effective as allowing only corporate IM solutions. References: CISA Review Manual (Digital Version), Chapter 5, Section 5.4.4

 The first course of action when a data breach has occurred due to malware is to quarantine the impacted systems. This means isolating the infected systems from the rest of the network and preventing any further communication or data transfer with them. This can help contain the spread of the malware, limit the damage and exposure of sensitive data, and facilitate the investigation and remediation of the incident. Quarantining the impacted systems can also help preserve the evidence and logs that may be needed for forensic analysis or legal action.

References:

[1] provides a guide on how to respond to a data breach caused by malware and recommends quarantining the impacted systems as the first step.

[2] explains what is malware and how it can cause data breaches, and suggests quarantining the infected devices as a best practice.

[3] describes the steps involved in quarantining a system infected by malware and the benefits of doing so.

The primary role of an audit reviewer with regard to evidence is to ensure that evidence is sufficient to support audit conclusions. Evidence is the information obtained by the auditor to provide a reasonable basis for the audit opinion or findings. Evidence should be sufficient, reliable, relevant, and useful to support the audit objectives and criteria. The audit reviewer should evaluate the quality and quantity of evidence collected by the auditor and determine if it is adequate to draw valid conclusions and recommendations. Ensuring unauthorized individuals do not tamper with evidence after it has been captured is a role of the auditor, not the audit reviewer. The auditor is responsible for safeguarding the evidence from loss, damage, or alteration during the audit process. The auditor should also document the source, date, and method of obtaining the evidence, as well as any limitations or restrictions on its use or disclosure. Ensuring appropriate statistical sampling methods were used is a role of the auditor, not the audit reviewer. The auditor is responsible for selecting an appropriate sampling method and technique that can provide sufficient evidence to achieve the audit objectives and criteria. The auditor should also document the sampling plan, population, sample size, selection method, evaluation method, and results. Ensuring evidence is labeled to show it was obtained from an approved source is a role of the auditor, not the audit reviewer. The auditor is responsible for labeling the evidence to indicate its origin, nature, and ownership. The auditor should also ensure that the evidence is obtained from reliable and credible sources that can be verified and corroborated. References: ISACA CISA Review Manual 27th Edition, page 295

When implementing Internet Protocol security (IPsec) architecture, the servers involved in application delivery communicate via Transport Layer Security (TLS), which is a protocol that provides encryption and authentication for data transmitted over a network. IPsec operates at the network layer and provides security for IP packets, while TLS operates at the transport layer and provides security for TCP connections. Blocking authorized users from unauthorized activities, channeling access only through the public-facing firewall, and channeling access through authentication are not functions of IPsec architecture. References: CISA Review Manual (Digital Version), Chapter 5, Section 5.4.2