In the mid- to late-1990s, the most common protocol used by websites was Hypertext Transfer Protocol (HTTP), which generated unencrypted web traffic. We recommend you review this pcap in a non-Windows environment like BSD, Linux or macOS if at all possible. There is a risk of infection if using a Windows computer. Warning: The pcap used for this tutorial contains Windows-based malware. Here is a Github repository with a ZIP archive containing the pcap and a key log file used for this tutorial. Note: Our instructions assume you have customized your Wireshark column display as previously described in “ Customizing Wireshark – Changing Your Column Display.”. Today, we will examine HTTPS activity from a Dridex malware infection. With this key log file, we can decrypt HTTPS activity in a pcap and review its contents. Decryption is possible with a text-based log containing encryption key data captured when the pcap was originally recorded. This Wireshark tutorial describes how to decrypt HTTPS traffic from a pcap in Wireshark. When reviewing pcaps from malware activity, it’s very helpful to know what’s contained within post-infection traffic. But like most websites, various types of malware also use HTTPS. Why? Because most websites use the Hypertext Transfer Protocol Secure (HTTPS) protocol. When reviewing suspicious network activity, we often run across encrypted traffic.
The instructions assume you are familiar with Wireshark, and it focuses on Wireshark version 3.x.
However, the "& 0xffffff00" expression masks off the fourth byte.This tutorial is designed for security professionals who investigate suspicious network activity and review packet captures (pcaps) of the traffic. Unfortunately, you want to examine three bytes, but you can only put 1, 2, or 4 after the colon, so three is not a valid value.
In the capture filter expressions "ether" and "ether", 0 and 6 are the starting bytes for the destination MAC address field and the source MAC address field respectively, and 4 is the number of bytes to examine. To capture packets where either the source or destination MAC address starts with 00:0C:22: But if you know where in the MAC address field those three bytes will be, you can use a byte-offset capture filter. You probably can't create a capture filter for MAC addresses containing 00:0C:22 anywhere in the MAC address fields. You said, "I want to capture all traffic from devices with MAC address containing 00:0C:22."
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