I was only limited by the techniques I could learn, the Open Source tools I could find (and modify, in some cases), and the time available to perform analysis and reporting. I could get as many PCAP files as I needed to analyze, understand, and produce detailed explanations of intrusion activity.
How do you get PCAP files with malicious communications in them? And how do you interpret what they contain?Īs I mentioned in that other article, I was fortunate in my early career to be allowed access to border-level network monitoring capabilities that I could use to investigate computer security incidents, identify compromised hosts, and help the owners clean them up.
If you are new to network forensics - the process of understanding what is happening on compromised networked computers by looking at their communications - it might be hard to know where to start. I will show you how get it up and running in just a few minutes! In this article, I provide a bit of background on using network captures to hunt for malware on your network and understand how it functions, then explain how to leverage a new Open Source platform to process PCAP files using that same command-line tool. I’ve previously described how to use a command-line tool I wrote called lim to search and access malware sandbox data from the CTU Malware Capture Facility, which archives hundreds of malware sandbox captures, all (as it happens) with PCAP files! Those seeking to advance in their career doing more detailed DF/IR tasks, including creating new signatures for detection and reporting on new capabilities in malware, need an even deeper understanding of what is contained in network traffic captures (commonly in PCAP format files ).Those hoping to become a security operation center (SOC) analyst need to know what is behind the alerts their network monitoring or end-point detection systems produce.These disciplines involve analyzing the network communications associated with remotely controlled malicious software installed on your organization’s computer systems. This article is aimed at those wanting to learn how to leverage network traffic capture and analysis tools as part of the digital forensics and incident response (DF/IR) processes.
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