Reading from file scenario.pcap, link-type EN10MB (Ethernet)Īs expected, we see the output 31263, confirming the capinfos output for number of frames. Since tcpdump outputs one packet per line of text output by default, this should give us the number of packets. We can verify this by reading the network capture and sending the text output to the command wc –l, which will provide a line count. According to the capinfos output, this capture file had over 31,623 frames. In an earlier example, we used the capinfos command to footprint a capture file. It useful to remove the noise and extract CC.Example: Filtering a Capture File to Reduce Size It's useful when malware uses custom port for communication to CC e.g Darkcomet.įilter based on port and SYN flag in tcp packet. Matches source or destination port for tcp protocol. Good for extracting CC for malware using SSL. It can be used to match any file type magic bytes which is present in http filedata. Match the given case-insensitive Perl-compatible regular expression(PCRE) with file_data. You can also search using hex instead of ascii strings.

It is very useful if you are looking for specific strings. This can be also good starting point to check if malware is sending any http request to CC. It can be used to filter when you know ip address of CC/victim machine.ĭisplay all types of http request e.g GET, POST etc.

Matches against both the IP source and destination addresses in the IP header. It can be used as starting point in analysis for checking any suspicious dns request or http to identify any CC. It will show all the packets with protocol dns or http. This not filter can be used when you want to filter any noise from specific protocol Adding HTTPS server names to the column display in Wireshark.Changing the column display in Wireshark.

Understanding of network behaviour during dynamic malware analysisīut before proceeding, I will highly recommend you to follow these two tutorials to modify the column setting of Wireshark, it will make the analysis much easier and efficient.

Easy to extract IoC (e.g Domain, IP etc) from pcap.

We can use this Wireshark display filter after we capture pcap during dynamic malware analysis. We will look into some of the Wireshark display filters which can be used in malware analysis.

Wireshark filters expressions