Dark_Mage-
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Unlike other methods, this will make the DLL undetectable even on injection. 
Code:
// ManualMap - by Darawk - RealmGX.com
//
// The purpose of ManualMap is to "manually map" a dll
// module into a remote process's address space. This
// means that instead of just manipulating the remote
// process into calling the LoadLibrary function, we
// have our own emulation of what LoadLibrary does
// without all those annoying detectability issues ^^.
// The advantage of this method over using something
// like my CloakDll function, is that this method never
// has to call a function like LoadLibrary inside the
// remote process. Since LoadLibrary can be hooked,
// the dll could still be caught at the injection stage.
// Or possibly also through the weakness I discussed in
// the comment header of that file, which is not present
// when using this technique.
#include <windows.h>
#include <tlhelp32.h>
#include <shlwapi.h>
#pragma comment(lib, "shlwapi.lib")
#define IMAGE_DIRECTORY_ENTRY_IMPORT 1
#define IMAGE_DIRECTORY_ENTRY_BASERELOC 5
// Pietrek's macro
//
// MakePtr is a macro that allows you to easily add to values (including
// pointers) together without dealing with C's pointer arithmetic. It
// essentially treats the last two parameters as DWORDs. The first
// parameter is used to typecast the result to the appropriate pointer type.
#define MakePtr( cast, ptr, addValue ) (cast)( (DWORD_PTR)(ptr) + (DWORD_PTR)(addValue))
// This one is mine, but obviously..."adapted" from matt's original idea =p
#define MakeDelta(cast, x, y) (cast) ( (DWORD_PTR)(x) - (DWORD_PTR)(y))
bool MapRemoteModule(unsigned long, char *);
unsigned long GetProcessIdByName(char *);
HMODULE GetRemoteModuleHandle(unsigned long, char *);
FARPROC GetRemoteProcAddress(unsigned long, char *, char *);
bool FixImports(unsigned long, void *, IMAGE_NT_HEADERS *, IMAGE_IMPORT_DESCRIPTOR *);
bool FixRelocs(void *, void *, IMAGE_NT_HEADERS *, IMAGE_BASE_RELOCATION *, unsigned int);
bool MapSections(HANDLE, void *, void *, IMAGE_NT_HEADERS *);
PIMAGE_SECTION_HEADER GetEnclosingSectionHeader(DWORD, PIMAGE_NT_HEADERS);
LPVOID GetPtrFromRVA(DWORD, PIMAGE_NT_HEADERS, PBYTE);
// Stub that calls the Dll from within the remote process.
// This is necessary because a DllMain function takes 3
// arguments, and CreateRemoteThread can pass only 1.
__declspec(naked) void DllCall_stub(HMODULE hMod)
{
_asm
{
push 0
push 1
push [esp+0Ch] // Pointer to the hMod argument
mov eax, 0xDEADBEEF // Patch this in with the real value at run-time
call eax // MSVC++ doesn't like direct absolute calls, so we have to be
// clever about it.
ret // Don't have to clean up the stack because the calling function
// is just going to call ExitThread() immediately after this
// function returns.
}
}
// Marker for the end of the DllCall_stub function
__declspec(naked) void DC_stubend(void) { }
int main(int argc, char **argv)
{
// Just my test values...Cmdline.dll is a plugin that comes with
// Olly Debug 1.10
MapRemoteModule(GetProcessIdByName("notepad.exe"), "Cmdline.dll");
return 0;
}
bool MapRemoteModule(unsigned long pId, char *module)
{
IMAGE_DOS_HEADER *dosHd;
IMAGE_NT_HEADERS *ntHd;
HANDLE hFile = CreateFile(module,
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if(hFile == INVALID_HANDLE_VALUE)
return false;
unsigned int fSize;
if(GetFileAttributes(module) & FILE_ATTRIBUTE_COMPRESSED)
fSize = GetCompressedFileSize(module, NULL);
else
fSize = GetFileSize(hFile, NULL);
unsigned char *dllBin = new unsigned char[fSize];
unsigned int nBytes;
ReadFile(hFile, dllBin, fSize, (LPDWORD)&nBytes, FALSE);
CloseHandle(hFile);
// Every PE file contains a little DOS stub for backwards compatibility
// it's only real relevance is that it contains a pointer to the actual
// PE header.
dosHd = MakePtr(IMAGE_DOS_HEADER *, dllBin, 0);
// Make sure we got a valid DOS header
if(dosHd->e_magic != IMAGE_DOS_SIGNATURE)
{
delete dllBin;
return false;
}
// Get the real PE header from the DOS stub header
ntHd = MakePtr(IMAGE_NT_HEADERS *, dllBin, dosHd->e_lfanew);
// Verify the PE header
if(ntHd->Signature != IMAGE_NT_SIGNATURE)
{
delete dllBin;
return false;
}
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pId);
if(!hProcess)
return false;
// Allocate space for the module in the remote process
void *moduleBase = VirtualAllocEx(hProcess,
NULL,
ntHd->OptionalHeader.SizeOfImage,
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
// Make sure we got the memory space we wanted
if(!moduleBase)
return false;
// Allocate space for our stub
void *stubBase = VirtualAllocEx(hProcess,
NULL,
MakeDelta(SIZE_T, DC_stubend, DllCall_stub),
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
// Make sure we got the memory space we wanted
if(!stubBase)
return false;
// Fix up the import table of the new module
IMAGE_IMPORT_DESCRIPTOR *impDesc = (IMAGE_IMPORT_DESCRIPTOR *)GetPtrFromRVA(
(DWORD)(ntHd->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress),
ntHd,
(PBYTE)dllBin);
if(ntHd->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size)
FixImports(pId,
(unsigned char *)dllBin,
ntHd,
impDesc);
// Fix "base relocations" of the new module. Base relocations are places
// in the module that use absolute addresses to reference data. Since
// the base address of the module can be different at different times,
// the base relocation data is necessary to make the module loadable
// at any address.
IMAGE_BASE_RELOCATION *reloc = (IMAGE_BASE_RELOCATION *)GetPtrFromRVA(
(DWORD)(ntHd->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress),
ntHd,
(PBYTE)dllBin);
if(ntHd->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size)
FixRelocs(dllBin,
moduleBase,
ntHd,
reloc,
ntHd->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size);
// Write the PE header into the remote process's memory space
WriteProcessMemory(hProcess,
moduleBase,
dllBin,
ntHd->FileHeader.SizeOfOptionalHeader + sizeof(ntHd->FileHeader) + sizeof(ntHd->Signature),
(SIZE_T *)&nBytes);
// Map the sections into the remote process(they need to be aligned
// along their virtual addresses)
MapSections(hProcess, moduleBase, dllBin, ntHd);
// Change the page protection on the DllCall_stub function from PAGE_EXECUTE_READ
// to PAGE_EXECUTE_READWRITE, so we can patch it.
VirtualProtect((LPVOID)DllCall_stub,
MakeDelta(SIZE_T, DC_stubend, DllCall_stub),
PAGE_EXECUTE_READWRITE,
(DWORD *)&nBytes);
// Patch the stub so it calls the correct address
*MakePtr(unsigned long *, DllCall_stub, 9) =
MakePtr(unsigned long, moduleBase, ntHd->OptionalHeader.AddressOfEntryPoint);
// Write the stub into the remote process
WriteProcessMemory(hProcess,
stubBase,
(LPVOID)DllCall_stub,
MakeDelta(SIZE_T, DC_stubend, DllCall_stub),
(SIZE_T *)&nBytes);
// Execute our stub in the remote process
CreateRemoteThread(hProcess,
NULL,
0,
(LPTHREAD_START_ROUTINE)stubBase,
moduleBase, // Pass the base address of the module as the argument to the stub.
// All a module handle is, is the base address of the module(except
// in windows CE), so we're really passing a handle to the module
// so that it can refer to itself, create dialogs, etc..
0,
NULL);
delete dllBin;
return true;
}
bool MapSections(HANDLE hProcess, void *moduleBase, void *dllBin, IMAGE_NT_HEADERS *ntHd)
{
IMAGE_SECTION_HEADER *header = IMAGE_FIRST_SECTION(ntHd);
unsigned int nBytes = 0;
unsigned int virtualSize = 0;
unsigned int n = 0;
// Loop through the list of sections
for(unsigned int i = 0; ntHd->FileHeader.NumberOfSections; i++)
{
// Once we've reached the SizeOfImage, the rest of the sections
// don't need to be mapped, if there are any.
if(nBytes >= ntHd->OptionalHeader.SizeOfImage)
break;
WriteProcessMemory(hProcess,
MakePtr(LPVOID, moduleBase, header->VirtualAddress),
MakePtr(LPCVOID, dllBin, header->PointerToRawData),
header->SizeOfRawData,
(LPDWORD)&n);
virtualSize = header->VirtualAddress;
header++;
virtualSize = header->VirtualAddress - virtualSize;
nBytes += virtualSize;
// Set the proper page protections for this section.
// This really could be skipped, but it's not that
// hard to implement and it makes it more like a
// real loader.
VirtualProtectEx(hProcess,
MakePtr(LPVOID, moduleBase, header->VirtualAddress),
virtualSize,
header->Characteristics & 0x00FFFFFF,
NULL);
}
return true;
}
bool FixImports(unsigned long pId, void *base, IMAGE_NT_HEADERS *ntHd, IMAGE_IMPORT_DESCRIPTOR *impDesc)
{
char *module;
// Loop through all the required modules
while((module = (char *)GetPtrFromRVA((DWORD)(impDesc->Name), ntHd, (PBYTE)base)))
{
// If the library is already loaded(like kernel32.dll or ntdll.dll) LoadLibrary will
// just return the handle to that module.
HMODULE localMod = LoadLibrary(module);
// If the module isn't loaded in the remote process, we recursively call the
// module mapping code. This has the added benefit of ensuring that any of
// the current modules dependencies will be just as invisble as this one.
if(!GetRemoteModuleHandle(pId, module))
MapRemoteModule(pId, module);
// Lookup the first import thunk for this module
// NOTE: It is possible this module could forward functions...which is something
// that I really should handle. Maybe i'll add support for forwared functions
// a little bit later.
IMAGE_THUNK_DATA *itd =
(IMAGE_THUNK_DATA *)GetPtrFromRVA((DWORD)(impDesc->FirstThunk), ntHd, (PBYTE)base);
while(itd->u1.AddressOfData)
{
IMAGE_IMPORT_BY_NAME *iibn;
iibn = (IMAGE_IMPORT_BY_NAME *)GetPtrFromRVA((DWORD)(itd->u1.AddressOfData), ntHd, (PBYTE)base);
itd->u1.Function = MakePtr(DWORD, GetRemoteProcAddress(pId,
module,
(char *)iibn->Name), 0);
itd++;
}
impDesc++;
}
return true;
}
bool FixRelocs(void *base, void *rBase, IMAGE_NT_HEADERS *ntHd, IMAGE_BASE_RELOCATION *reloc, unsigned int size)
{
unsigned long ImageBase = ntHd->OptionalHeader.ImageBase;
unsigned int nBytes = 0;
unsigned long delta = MakeDelta(unsigned long, rBase, ImageBase);
while(1)
{
unsigned long *locBase =
(unsigned long *)GetPtrFromRVA((DWORD)(reloc->VirtualAddress), ntHd, (PBYTE)base);
unsigned int numRelocs = (reloc->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(WORD);
if(nBytes >= size) break;
unsigned short *locData = MakePtr(unsigned short *, reloc, sizeof(IMAGE_BASE_RELOCATION));
for(unsigned int i = 0; i < numRelocs; i++)
{
if(((*locData >> 12) & IMAGE_REL_BASED_HIGHLOW))
*MakePtr(unsigned long *, locBase, (*locData & 0x0FFF)) += delta;
locData++;
}
nBytes += reloc->SizeOfBlock;
reloc = (IMAGE_BASE_RELOCATION *)locData;
}
return true;
}
FARPROC GetRemoteProcAddress(unsigned long pId, char *module, char *func)
{
HMODULE remoteMod = GetRemoteModuleHandle(pId, module);
HMODULE localMod = GetModuleHandle(module);
// Account for potential differences in base address
// of modules in different processes.
unsigned long delta = MakeDelta(unsigned long, remoteMod, localMod);
return MakePtr(FARPROC, GetProcAddress(localMod, func), delta);
}
unsigned long GetProcessIdByName(char *process)
{
PROCESSENTRY32 pe;
HANDLE thSnapshot;
BOOL retval, ProcFound = false;
thSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if(thSnapshot == INVALID_HANDLE_VALUE)
{
MessageBox(NULL, "Error: unable to create toolhelp snapshot", "Loader", NULL);
return false;
}
pe.dwSize = sizeof(PROCESSENTRY32);
retval = Process32First(thSnapshot, &pe);
while(retval)
{
if(StrStrI(pe.szExeFile, process) )
{
ProcFound = true;
break;
}
retval = Process32Next(thSnapshot,&pe);
pe.dwSize = sizeof(PROCESSENTRY32);
}
return pe.th32ProcessID;
}
HMODULE GetRemoteModuleHandle(unsigned long pId, char *module)
{
MODULEENTRY32 modEntry;
HANDLE tlh = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pId);
modEntry.dwSize = sizeof(MODULEENTRY32);
Module32First(tlh, &modEntry);
do
{
if(!stricmp(modEntry.szModule, module))
return modEntry.hModule;
modEntry.dwSize = sizeof(MODULEENTRY32);
}
while(Module32Next(tlh, &modEntry));
return NULL;
}
// Matt Pietrek's function
PIMAGE_SECTION_HEADER GetEnclosingSectionHeader(DWORD rva, PIMAGE_NT_HEADERS pNTHeader)
{
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(pNTHeader);
unsigned int i;
for ( i = 0; i < pNTHeader->FileHeader.NumberOfSections; i++, section++ )
{
// This 3 line idiocy is because Watcom's linker actually sets the
// Misc.VirtualSize field to 0. (!!! - Retards....!!!)
DWORD size = section->Misc.VirtualSize;
if ( 0 == size )
size = section->SizeOfRawData;
// Is the RVA within this section?
if ( (rva >= section->VirtualAddress) &&
(rva < (section->VirtualAddress + size)))
return section;
}
return 0;
}
// This function is also Pietrek's
LPVOID GetPtrFromRVA( DWORD rva, IMAGE_NT_HEADERS *pNTHeader, PBYTE imageBase )
{
PIMAGE_SECTION_HEADER pSectionHdr;
INT delta;
pSectionHdr = GetEnclosingSectionHeader( rva, pNTHeader );
if ( !pSectionHdr )
return 0;
delta = (INT)(pSectionHdr->VirtualAddress-pSectionHdr->PointerToRawData);
return (PVOID) ( imageBase + rva - delta );
}
