08 February 2011 | 11,217 views

Proxocket – DLL Proxy For Winsock

Cybertroopers storming your ship?

Proxocket is a dll proxy project for the main Winsock functions which allows to capture any type of packet and data sent/received by a specific software of your choice and optionally modifying its content or the connect, bind and accept functions through a custom dll very easy to create.

Proxocket handles the following functions for both ws2_32.dll and wsock32.dll:

  • WSAStartup,
  • socket,
  • WSASocketA,
  • WSASocketW,
  • closesocket,
  • connect,
  • WSAConnect,
  • bind,
  • accept,
  • WSAAccept,
  • recv,
  • recvfrom,
  • WSARecv,
  • WSARecvFrom,
  • WSARecvEx,
  • send,
  • sendto,
  • WSASend,
  • & WSASendTo.

It has also specific support for TCP, UDP, ICMP, IGMP and RAW packets with handling of SOCK_STREAM, SOCK_DGRAM and SOCK_RAW on both incoming and outgoing data.

The project is divided in two parts:

  1. monitoring/sniffing: a CAP file in tcpdump format will be generated for any captured packet, this is the default operation
  2. user’s custom manipulation of the captured data: through a custom myproxocket.dll edited and created by the same user is possible to have control over the captured data like creating a rudimental firewall for a specific software or editing the data which will be passed to the main program on the fly or creating a decompressor/decrypter/protocol_analyzer and so on

Read the text file inside for more information and if you want to write a plugin take a look at the source code ofthe myproxocket.c example.

The following are some “example plugins” the author wrote for proxyfying the main program and or doing some things:

NOTE: If you have Vista and the local ws2_32/wsock32 dlls are not loaded try to set the registry key “HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Image File Execution Options\DevOverrideEnable” to 1.
NOTE: The exported functions of myproxocket.dll MUST be declared as CDECL, this is default on Mingw but not on other compilers.
NOTE: Do NOT use Cygwin for compiling the myproxocket plugins.

There’s some good information on how to use Proxocket here.

You can download Proxocket here:


Or read more here.


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One Response to “Proxocket – DLL Proxy For Winsock”

  1. Praful Agarwal 17 March 2011 at 12:35 pm Permalink

    Nice App to work with