[TOOL] Tiny Windows 2000 Reverse Connect

From: SecuriTeam (support_at_securiteam.com)
Date: 10/08/03

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Date: 8 Oct 2003 09:59:58 +0200

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      Tiny Windows 2000 Reverse Connect
    ------------------------------------------------------------------------

    DETAILS

    Most operating systems ship with a massive number of files that have not
    been modified since the initial release. These files can be used to
    develop small service-pack independent shellcode. The trick is to use a
    single LoadLibraryA call to get the module base, and then call the IAT
    functions directly using hard-coded offsets. The result is a
    reverse-connect/download-shellcode payload that is 179 bytes and works on
    every service pack of Windows 2000.

    H D Moore managed to get a null-free version right around 200 bytes, but
    any small XOR encoder will work as well. This technique, dubbed 'Vampiric
    Imports' is implemented in the following code:
     - <http://metasploit.com/sc/win2000_vampiric_connector.asm>
    http://metasploit.com/sc/win2000_vampiric_connector.asm

    A tiny XOR decoder based on noir's fnstenv getpc is online at:
     - <http://metasploit.com/sc/x86_fnstenv_xor_byte.asm>
    http://metasploit.com/sc/x86_fnstenv_xor_byte.asm

    It should be possible to build similar payloads that work with NT 4.0,
    Windows XP, and Windows 2003.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:sflist@digitaloffense.net> H
    D Moore.

    ========================================

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