02 July 2007 | 14,502 views

tcpxtract – Extract Files from Network Traffic AKA Carving

Check For Vulnerabilities with Acunetix

tcpxtract is a tool for extracting files from network traffic based on file signatures. Extracting files based on file type headers and footers (sometimes called “carving”) is an age old data recovery technique. Tools like Foremost employ this technique to recover files from arbitrary data streams. tcpxtract uses this technique specifically for the application of intercepting files transmitted across a network.

Other tools that fill a similar need are driftnet and EtherPEG. driftnet and EtherPEG are tools for monitoring and extracting graphic files on a network and is commonly used by network administrators to police the internet activity of their users. The major limitations of driftnet and EtherPEG is that they only support three filetypes with no easy way of adding more. The search technique they use is also not scalable and does not search across packet boundries.

tcpxtract features the following:

  • Supports 26 popular file formats out-of-the-box. New formats can be added by simply editing its config file.
  • With a quick conversion, you can use your old Foremost config file with tcpxtract.
  • Custom written search algorithm is lightning fast and very scalable.
  • Search algorithm searches across packet boundries for total coverage and forensic quality.
  • Uses libpcap, a popular, portable and stable library for network data capture.
  • Can be used against a live network or a tcpdump formatted capture file.

You can download tcpxtract here:

tcpxtract Version 1.0.1 source

Or read more here.


Recent in Forensics:
- DAMM – Differential Analysis of Malware in Memory
- Malheur – Automatic Malware Analysis Tool
- LiME – Linux Memory Extractor

Related Posts:
- Foremost – Recover Files From Drive or Drive Image AKA Carving
- NetworkMiner – Passive Sniffer & Packet Analysis Tool for Windows
- PlainSight – Open Source Computer Forensics LiveCD

Most Read in Forensics:
- NetworkMiner – Passive Sniffer & Packet Analysis Tool for Windows - 66,134 views
- raw2vmdk – Mount Raw Hard Disk (dd) Images As VMDK Virtual Disks - 32,845 views
- sslsniff v0.6 Released – SSL MITM Tool - 27,126 views

Low-cost VPS Hosting

2 Responses to “tcpxtract – Extract Files from Network Traffic AKA Carving”

  1. Sandeep Nain 3 July 2007 at 12:14 am Permalink

    Wow, It sounds like a ‘must have’ tool.
    Thanks Darknet…

  2. Freddy Chang 17 August 2007 at 12:54 pm Permalink

    Any plans of a windows port?