![]() ![]() Initiating an HTTP Form-based authentication, capturing it in Wireshark and analyzing it so you can see the username and password clearly. We'll use dnscat2 for this lab, another framework that will allow us to demonstrate the basic principles of DNS command and control traffic. Connecting to an HTTP Server and initiate a Basic HTTP Authentication and capturing its Traffic on Wireshark. DNS is typically permitted out of corporate environments, and we can use it for C2 and exfiltration. DNS C2 is a feature of many popular frameworks, including Cobalt Strike. Wireshark is a free and open-source packet analyzer that allows you to examine network data transmissions in real-time. ![]() In this second lab, we'll look at another vector for command and control, DNS. ![]() We also created our first Snort rule to detect Empire's default IIS server response. We looked at opportunities to detect C2 channels based on several static and behavioural traits - default URIs, user agents, server responses and beaconing. We used PowerShell Empire, a classic post-exploitation framework that has been a popular choice for threat actors since its introduction back in 2015. This was part of Advent of Cyber 1 Day 6.-SSD secure. In the previous lab, we looked at HTTP C2 channels. In this video walkthrough, We analyzed data exfiltration through DNS given a pcap file with Wireshark. A recording of the workshop can be found here. As with previous workshops, the following blog provides a second step-by-step guide to recreating the demos from that C2 and Exfiltration workshop, as well as exercises to further the reader's understanding of the concepts shown. Using Wireshark to identify and analyze ARP, ICMP, and DNS traffic is a great tool to add to a network engineers toolkit. We also explored the detection strategies that can be employed to spot these channels using our own detection stacks, including ways to spot these channels being used for exfiltration. ![]()
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