Final answer:
Following the preliminary external activities, the security team will likely pivot from the compromised system to conduct internal exploitation, like lateral movement and data exfiltration, to assess defense effectiveness.
Step-by-step explanation:
After the security assessment team has limited their external activities and moved to a compromised box within the enterprise perimeter, the method they are most likely to employ next is pivoting from the compromised system. This involves moving laterally through the enterprise network, trying to exfiltrate data and compromise additional devices. The goal of this phase is to simulate an attacker leveraging the initial foothold to deepen their presence within the network, assessing the effectiveness of the internal defenses and the potential impact of an internal threat.
This approach is consistent with using intelligence services to defeat external threats and using counterintelligence services to protect from internal threats by exposing vulnerabilities. The assessment team's activities during the internal exploitation phase will be based on gathering evidence to demonstrate the reality of the threat and the workability of the potential solutions, while complying with legal frameworks such as the Personal Data Notification & Protection Act of 2017.