And you should also have a basic understanding of how malware infections occur. Keep in mind you must understand network traffic fundamentals to effectively use Wireshark. Pcaps for this tutorial are available here. It covers display filter expressions I find useful in reviewing pcaps of malicious network traffic from infected Windows hosts. Today's post provides more tips for analysts to better use Wireshark. To better accomplish this work, I use a customized Wireshark column display as described my previous blog about using Wireshark. Packet by packet, this "machine" is asked, if this particular packet should be shown or not.As a Threat Intelligence Analyst for Palo Alto Networks Unit 42, I often use Wireshark to review packet captures (pcaps) of network traffic generated by malware samples. Or operand: || (Example: ip.addr = 207.1.1.222 || stination = 1)Įverytime you change the filter string and click the "Apply" button, all packets will be reread from the capture file (or from memory), and processed by the display filter "machine".And operand: & (Example: sbus.cmd = 0圆 & stination = 1).It is also possible combining multiple filters by using the AND- and OR operands: From this window, the available filter expressions and conditions can be selected. The filter strings, written in a special display filter language are entered in the "filter field" (green region in the picture below) of Wireshark:īy pressing the "Expressions" button, the following window shows up. Below a small selection of the most used fields: The plugin for dissecting (interpreting) Ether-S-Bus traffic offers a wide range of telegram properties and filter conditions. The display filter will not affect the data captured, it will only select which packets of the captured data are displayed on the screen. Telegrams that do not match the filter are not stored to the capture file! Please refer to FAQ 100224 for more information.įiltering the telegrams of a captured file based on the telegram contents (command code, presence of values etc.). Wireshark basically offer two different possibilities for filtering Ethernet traffic:įiltering while capturing based on the source/destination IP or the TCP/UDP ports used). The Ether-S-Bus plugin allows filtering the captured telegrams based on one or several properties of the telegram such as the command code contained in the telegram and/or the value of a transmitted media etc.
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