Wireshark Capture Filter Port: A Powerful Tool for Malware Analysis

When it comes to analyzing malware, removing noise and extracting relevant information is crucial. One effective way to do this is by using a Wireshark capture filter based on port and SYN flag in TCP packets. This technique is particularly useful when malware uses custom ports for communication with its Command and Control (CC) servers.

For instance, Darkcomet, a popular remote administration tool, often uses custom ports to communicate with its CC server. By applying a filter based on the source or destination port for the TCP protocol, you can extract valuable information about the malware's communication patterns.

Another advantage of this technique is that it allows you to match any file type magic bytes present in HTTP file data. This means you can search for specific strings using hex or ASCII strings, making it a powerful tool for identifying suspicious activity.

In addition to filtering by port, Wireshark also enables you to filter based on IP addresses. By specifying the IP address of the CC server or victim machine, you can display all types of HTTP requests, including GET and POST requests.

This filter is particularly useful when you're analyzing DNS requests and HTTP traffic to identify potential Command and Control (CC) activity. By applying this filter, you'll be able to see all packets with the DNS or HTTP protocol, making it easier to extract important information about the malware's behavior.

To get the most out of Wireshark, it's essential to understand how to modify the column display settings. This will enable you to customize your analysis and make it more efficient. Two tutorials that can help you achieve this are 'Adding HTTPS server names to the column display in Wireshark' and 'Changing the column display in Wireshark'.

In addition to filtering by port, Wireshark also enables you to extract important indicators of compromise (IoC) such as domains and IP addresses from PCAP files. This is a valuable tool for incident responders and malware analysts who need to quickly identify and respond to threats.

In conclusion, the Wireshark capture filter based on port and SYN flag in TCP packets is a powerful tool for malware analysis. By applying this filter, you can extract valuable information about malware's communication patterns and identify potential Command and Control (CC) activity. With practice and patience, you'll be able to use Wireshark to gain a deeper understanding of network behavior during dynamic malware analysis.

Wireshark capture filter port