tcpxtract

tcpxtract is a tool designed to extract files from network traffic by identifying file signatures. This method of extracting files, which relies on recognizing file type headers and footers (often referred to as 'carving'), is a traditional data recovery technique. Tools such as Foremost utilize this technique to recover files from various data streams. Tcpxtract applies this technique specifically to intercept files that are transmitted over a network. Other similar tools include driftnet and EtherPEG. Driftnet and EtherPEG are utilized for monitoring and extracting graphic files from network traffic, and they are frequently employed by network administrators to oversee the internet activities of their users.

The primary limitations of driftnet and EtherPEG are that they only support three file types, and there is no straightforward method to add more file types.

The search technique they use is not scalable and does not search across packet boundaries. Tcpxtract has the following features: It supports 26 popular file formats right out of the box. You can easily add new formats by simply editing its configuration file. With a quick conversion process, you can utilize your existing Foremost configuration file with tcpxtract. The custom-written search algorithm is extremely fast and highly scalable. This search algorithm effectively searches across packet boundaries, ensuring complete coverage and forensic quality. It utilizes libpcap, which is a widely used, portable, and stable library.