Isaca Updated CISM Exam Questions and Answers by lee

According to the CISM Review Manual (Digital Version), page 212, the incident response process consists of six phases: preparation, identification, containment, eradication, recovery, and lessons learned. Containment is the phase where the incident response team isolates the affected systems or networks to prevent further damage or spread of the malware. Eradication is the phase where the incident response team removes the malware and any traces of its activity from the affected systems or networks. Recovery is the phase where the incident response team restores the normal operations of the systems or networks. Identification is the phase where the incident response team detects and analyzes the signs of the incident. Therefore, the information security manager should be confident that the malware has not continued to spread at the completion of the containment phase, which is the earliest phase where the incident response team can stop the propagation of the malware. References = 1: CISM Review Manual (Digital Version), page 212

Mitigate is the risk treatment option that has been applied by implementing a firewall in front of the legacy application because it helps to reduce the impact or probability of a risk. Mitigate is a process of taking actions to lessen the negative effects of a risk, such as implementing security controls, policies, or procedures. A firewall is a security device that monitors and filters the network traffic between the legacy application and the external network, blocking or allowing packets based on predefined rules. A firewall helps to mitigate the risk of unauthorized access, exploitation, or attack on the legacy application that cannot be patched. Therefore, mitigate is the correct answer.