Exam 312-49v10 topic 1 question 828 discussion

During an investigation, a forensics analyst discovers an unusual increase in outbound network traffic, network traffic traversing on non-standard ports, and multiple failed login attempts on a host system. The analyst also found that certain programs were using these unusual ports, appearing to be legitimate. If these are the primary Indicators of Compromise, what should be the next immediate step in the investigation to contain the intrusion effectively?