Culture has a significant impact on how information security will be implemented. Representation by regional business leaders may not have a major influence unless it concerns cultural issues. Composition of the board may not have a significant impact compared to cultural issues. IT security skills are not as key or high impact in designing a multinational information security program as would be cultural issues.

Installing an intrusion detection system (IDS) will allow the information security manager to better pinpoint the source of the attack so that countermeasures may then be taken. An IDS is not limited to detection of attacks originating externally. Proper placement of agents on the internal network can be effectively used to detect an internally based attack. Requiring the use of strong passwords will not be sufficiently effective against a network-based attack. Assigning IP addresses would not be effective since these can be spoofed. Implementing centralized logging software will not necessarily provide information on the source of the attack.

Explanation
According to the CISM Review Manual, the incident response team should preserve the evidence as the first step to prepare for a third-party forensics investigation, as it helps to maintain the integrity and admissibility of the evidence in a court of law. Preserving the evidence may include isolating and imaging the infected systems, but these are not the only actions required. Cleaning the malware may destroy or alter the evidence and should be avoided until the investigation is completed.
References = CISM Review Manual, 27th Edition, Chapter 3, Section 3.6.2, page 165

Explanation
Defining security strategies to support organizational programs is a primary responsibility of the information security governance function, as it involves providing strategic direction for security activities and ensuring that objectives are achieved. According to ISACA, information security governance is a subset of corporate governance that provides guidance for aligning information security with business objectives, managing information security risks, and using information resources responsibly12.
References = CISM Review Manual, 27th Edition, Chapter 4, Section 4.1.1, page 2131; CISM Online Review Course, Module 4, Lesson 1, Topic 12