Smartcard APDU sniffer for windows
C C++ Objective-C
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README.md

Smartcard Sniffer

Wrote this as I was using APDUView utility quite a lot, but it's sometimes complicated to set up. This tool uses AppInit_Dlls functionality to achieve the same with more ease. It hooks winscard!SCardTransmit and logs both sent and received data to a log file. Log file is located in the same directory as the SmartcardSniffer.dll, and has a name of the application that is talking to the smart card.

Precompiled binaries (current version) for x86 and x86_64 available here.

It's using MHook lib to do it's hooking business.

To install the dll, just add it's path to:

  • for 32 bit DLL on 32 bit systems:
    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\AppInit_DLLs]
  • for 64 bit DLL on 64 bit system:
    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\AppInit_DLLs]
  • for 32 bit DLL on 64 bit system (for hooking 32 bit applications on 64 bit systems):
    • [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Windows\AppInit_DLLs]

Multiple entries are separated by space and/or ,. Make sure you path to the DLL doesn't have any spaces in it.

Note that on Windows Vista and later, you'd also need to set RequireSignedAppInit_DLLs key to 0 to be able to load unsigned DLLs and make sure LoadAppInit_DLLs is set to 1.

To uninstall it, simply remove the DLL entry from AppInit_DLLs list.

In the log file >>> specifies the data to be sent, and <<< received data. Here's the example of the logged data:

        >>> 00:A4:04:00:0B:A0:00:00:03:97:43:49:44:5F:01:00
        <<< 6A:82
        Winscard!SCardTransmit:
        >>> 00:CA:7F:68:00
        <<< 7F:60:1F:83:A1:21:06:06:60:81:4B:01:65:03:A1:14:81:01:08:82:11:08:87:02:00:1A:88:02:08:04:B1:04:B1:02:14:3C:90:00
        Winscard!SCardTransmit:
        >>> 00:A4:04:00:09:A0:00:00:03:08:00:00:10:00
        <<< 6A:82
  • ea