![]() ![]() ![]() 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. The "Filter Expression" dialog box can help you build display filters.This tutorial is designed for security professionals who investigate suspicious network activity and review packet captures (pcaps) of the traffic. For display filters, try the display filters page on the Wireshark wiki. For example, to capture only packets sent to port 80, use: dst tcp port 80Ĭouple that with an http display filter, or use: tcp.dstport = 80 & httpįor more on capture filters, read " Filtering while capturing" from the Wireshark user guide, the capture filters page on the Wireshark wiki, or pcap-filter (7) man page. If you want to measure the number of connections rather than the amount of data, you can limit the capture or display filters to one side of the communication. Note that a filter of http is not equivalent to the other two, which will include handshake and termination packets. Ping packets should use an ICMP type of 8 (echo) or 0 (echo reply), so you could use a capture filter of: icmpĪnd a display filter of: icmp.type = 8 || icmp.type = 0įor HTTP, you can use a capture filter of: tcp port 80 ![]()
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