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Digital Forensics and Incident Response

You're reading from  Digital Forensics and Incident Response

Product type Book
Published in Jul 2017
Publisher Packt
ISBN-13 9781787288683
Pages 324 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Gerard Johansen Gerard Johansen
Profile icon Gerard Johansen

Packet capture


Capturing network traffic is critical to having a full understanding of an incident. Being able to identify potential C2 traffic IP addresses may provide further information about the type of malware that might have 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 in-line with the compromised host and the switch. For example, in the network diagram, if the host that is compromised 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 on to...

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