Packet capture
Capturing network traffic is critical to having a full understanding of an incident. Being able to identify potential C2 IP address traffic may provide further information about the type of malware that has infected a host. In other types of incidents, CSIRT members may be able to identify potential exfiltration methods that an external threat actor is utilizing.
One method is to set up what is referred to as a network tap. A network tap is a system that is in line with the compromised host and the switch. For example, in the network diagram, if the compromised host is on the 192.168.1.0/24 subnet, the tap should be placed in between the host and the switch. This often involves placing a system in between the host and the switch.
Another option is to configure a Switched Port Analyzer (SPAN) port. In this configuration, the switch closest to the compromised host will have port mirroring enabled. This then sends the traffic from the entire segment the switch is...
