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Always find the base address of kernel32.dll.

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This commit is contained in:
Jason Hood 2014-01-27 14:03:53 +10:00
parent b2c8a9ec12
commit bccf933c0a
5 changed files with 298 additions and 143 deletions
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18
ANSI.c
View File

@ -111,9 +111,10 @@
v.166, 20 & 21 September, 2013:
fix 32-bit process trying to detect 64-bit process.
v1.67, 25 January, 2014:
v1.67, 25 to 27 January, 2014:
don't hook ourself from LoadLibrary or LoadLibraryEx;
update the LoadLibraryEx flags that should not cause hooking.
update the LoadLibraryEx flags that should not cause hooking;
always find the base address of kernel32.dll.
*/
#include "ansicon.h"
@ -252,8 +253,9 @@ SHARED DWORD s_flag;
#define GRM_INIT 1
#define GRM_EXIT 2
SHARED DWORD LLW32r;
#ifdef _WIN64
SHARED DWORD LLW32;
SHARED DWORD LLW64r;
#endif
@ -1842,6 +1844,16 @@ BOOL WINAPI DllMain( HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved )
hDllInstance = hInstance; // save Dll instance handle
DEBUGSTR( 1, L"hDllInstance = %p", hDllInstance );
if (LLW32r == 0)
{
if (!get_LLW32r())
return FALSE;
#ifdef _WIN64
if (!get_LLW64r())
return FALSE;
#endif
}
// Get the entry points to the original functions.
hKernel = GetModuleHandleA( APIKernel );
for (hook = Hooks; hook->name; ++hook)

30
ansicon.c
View File

@ -78,7 +78,7 @@
don't write the reset sequence if output is redirected.
*/
#define PDATE L"25 January, 2014"
#define PDATE L"27 January, 2014"
#include "ansicon.h"
#include "version.h"
@ -111,10 +111,11 @@ BOOL GetParentProcessInfo( LPPROCESS_INFORMATION ppi, LPTSTR );
// The DLL shares this variable, so injection requires it here.
DWORD LLW32r;
#ifdef _WIN64
DWORD LLW32;
extern LPVOID base;
DWORD LLW64r;
#endif
extern LPVOID kernel32_base;
// Find the name of the DLL and inject it.
@ -137,11 +138,18 @@ BOOL Inject( LPPROCESS_INFORMATION ppi, BOOL* gui, LPCTSTR app )
#ifdef _WIN64
wsprintf( dll + len, L"ANSI%d.dll", type );
if (type == 32)
{
get_LLW32r();
InjectDLL32( ppi, dll );
}
else
{
get_LLW64r();
InjectDLL64( ppi, dll );
}
#else
wcscpy( dll + len, L"ANSI32.dll" );
get_LLW32r();
InjectDLL32( ppi, dll );
#endif
return TRUE;
@ -275,19 +283,15 @@ int main( void )
DEBUGSTR( 1, L"Already installed" );
}
else if (GetParentProcessInfo( &pi, arg ))
{
pi.hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pi.dwProcessId);
pi.hThread = OpenThread( THREAD_ALL_ACCESS, FALSE, pi.dwThreadId );
SuspendThread( pi.hThread );
#ifdef _WIN64
// Find the base address of kernel32.dll if the 64-bit version is
// injecting into a 32-bit parent.
if (IsWow64Process( pi.hProcess, &gui ) && gui)
{
HANDLE hSnap;
MODULEENTRY32 me;
BOOL fOk;
pi.hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pi.dwProcessId);
pi.hThread = OpenThread( THREAD_ALL_ACCESS, FALSE, pi.dwThreadId );
SuspendThread( pi.hThread );
// Find the base address of kernel32.dll.
hSnap = CreateToolhelp32Snapshot( TH32CS_SNAPMODULE |
TH32CS_SNAPMODULE32,
pi.dwProcessId );
@ -299,14 +303,12 @@ int main( void )
{
if (_wcsicmp( me.szModule, L"kernel32.dll" ) == 0)
{
base = me.modBaseAddr;
kernel32_base = me.modBaseAddr;
break;
}
}
CloseHandle( hSnap );
}
}
#endif
if (!Inject( &pi, &gui, arg ))
rc = 1;
ResumeThread( pi.hThread );

2
ansicon.h
View File

@ -47,6 +47,8 @@ typedef struct
int ProcessType( LPPROCESS_INFORMATION, BOOL* );
void InjectDLL32( LPPROCESS_INFORMATION, LPCTSTR );
void InjectDLL64( LPPROCESS_INFORMATION, LPCTSTR );
BOOL get_LLW32r( void );
BOOL get_LLW64r( void );
extern TCHAR prog_path[MAX_PATH];
extern LPTSTR prog;

110
injdll32.c
View File

@ -31,13 +31,14 @@ TWow64SetThreadContext Wow64SetThreadContext;
#define CONTEXT_CONTROL WOW64_CONTEXT_CONTROL
#define GetThreadContext Wow64GetThreadContext
#define SetThreadContext Wow64SetThreadContext
#endif
extern DWORD LLW32r;
LPVOID kernel32_base;
PIMAGE_DOS_HEADER pDosHeader;
#define MakeVA( cast, offset ) (cast)((DWORD_PTR)pDosHeader + (DWORD)(offset))
extern DWORD LLW32;
LPVOID base;
static PIMAGE_DOS_HEADER pDosHeader;
int export_cmp( const void* a, const void* b )
{
return strcmp( (LPCSTR)a, MakeVA( LPCSTR, *(const PDWORD)b ) );
@ -45,12 +46,9 @@ int export_cmp( const void* a, const void* b )
/*
Get the relative address of the 32-bit LoadLibraryW function from 64-bit code.
This was originally done via executing a helper program (ANSI-LLW.exe), but I
never liked doing that, so now I do it the "hard" way - load the 32-bit
kernel32.dll directly and search the exports.
Get the relative address of LoadLibraryW direct from kernel32.dll.
*/
BOOL get_LLW32( void )
BOOL get_LLW32r( void )
{
HMODULE kernel32;
TCHAR buf[MAX_PATH];
@ -61,7 +59,11 @@ BOOL get_LLW32( void )
PWORD ord_table;
PDWORD pLLW;
#ifdef _WIN64
len = GetSystemWow64Directory( buf, MAX_PATH );
#else
len = GetSystemDirectory( buf, MAX_PATH );
#endif
wcscpy( buf + len, L"\\kernel32.dll" );
kernel32 = LoadLibraryEx( buf, NULL, LOAD_LIBRARY_AS_IMAGE_RESOURCE );
if (kernel32 == NULL)
@ -89,24 +91,24 @@ BOOL get_LLW32( void )
FreeLibrary( kernel32 );
return FALSE;
}
LLW32 = fun_table[ord_table[pLLW - name_table]];
LLW32r = fun_table[ord_table[pLLW - name_table]];
FreeLibrary( kernel32 );
return TRUE;
}
#else
DWORD LLW32;
#endif
void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
{
CONTEXT context;
DWORD ep;
DWORD len;
BOOL eip;
LPVOID mem;
DWORD mem32;
DWORD pr;
DWORD LLW;
DWORD len;
#define CODESIZE 20
BYTE code[CODESIZE+TSIZE(MAX_PATH)];
union
@ -114,9 +116,23 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
PBYTE pB;
PDWORD pL;
} ip;
#ifdef _WIN64
BOOL entry = FALSE;
#endif
struct unicode_string
{
USHORT Length;
USHORT MaximumLength;
DWORD Buffer;
};
struct ldr_module // incomplete definition
{
DWORD next, prev;
DWORD baseAddress;
DWORD entryPoint;
DWORD sizeOfImage;
struct unicode_string fullDllName;
struct unicode_string baseDllName;
} ldr;
WCHAR basename[MAX_PATH];
#ifdef IMPORT_WOW64
if (Wow64GetThreadContext == 0)
@ -137,7 +153,6 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
len = TSIZE(lstrlen( dll ) + 1);
if (len > TSIZE(MAX_PATH))
return;
CopyMemory( code + CODESIZE, dll, len );
len += CODESIZE;
@ -149,36 +164,15 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
ip.pB = code;
// Determine the base address of kernel32.dll. If injecting into the parent
// process, the base has already been determined. Otherwise, use the PEB to
// walk the loaded modules.
if (kernel32_base != 0)
{
ep = context.Eip;
if (LLW32 == 0)
{
#ifndef _WIN64
LLW32 = (DWORD)GetProcAddress( GetModuleHandle( L"kernel32.dll" ),
"LoadLibraryW" );
#else
struct unicode_string
{
USHORT Length;
USHORT MaximumLength;
DWORD Buffer;
};
struct ldr_module // incomplete definition
{
DWORD next, prev;
DWORD baseAddress;
DWORD entryPoint;
DWORD sizeOfImage;
struct unicode_string fullDllName;
struct unicode_string baseDllName;
} ldr;
WCHAR basename[MAX_PATH];
if (!get_LLW32())
return;
// Determine the base address of the 32-bit kernel32.dll. If injecting
// into the parent process, base has already been determined. Otherwise,
// use the PEB to walk the loaded modules.
if (base == 0)
eip = TRUE;
}
else
{
// When a process is created suspended, EAX has the entry point and EBX
// points to the PEB.
@ -188,11 +182,12 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
DEBUGSTR( 1, L"Failed to read Ldr from PEB." );
return;
}
ep = context.Eax;
eip = FALSE;
// In case we're a bit slow (which seems to be unlikely), set up an
// infinite loop as the entry point.
WriteProcessMemory( ppi->hProcess, mem, "\xEB\xFE", 2, NULL );
FlushInstructionCache( ppi->hProcess, mem, 2 );
ep = context.Eax;
context.Eax = mem32;
SetThreadContext( ppi->hThread, &context );
VirtualProtectEx( ppi->hProcess, mem, len, PAGE_EXECUTE, &pr );
@ -220,7 +215,7 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
basename, ldr.baseDllName.MaximumLength, NULL );
if (_wcsicmp( basename, L"kernel32.dll" ) == 0)
{
LLW32 += ldr.baseAddress;
kernel32_base = UIntToPtr( ldr.baseAddress );
goto gotit;
}
} while (ldr.next != *ip.pL + 0x1c);
@ -228,12 +223,9 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
gotit:
SuspendThread( ppi->hThread );
VirtualProtectEx( ppi->hProcess, mem, len, pr, &pr );
entry = TRUE;
}
else
LLW32 += PtrToUint( base );
#endif
}
LLW = PtrToUint( kernel32_base ) + LLW32r;
kernel32_base = 0;
*ip.pB++ = 0x68; // push ep
*ip.pL++ = ep;
@ -242,7 +234,7 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
*ip.pB++ = 0x68; // push L"path\to\ANSI32.dll"
*ip.pL++ = mem32 + CODESIZE;
*ip.pB++ = 0xe8; // call LoadLibraryW
*ip.pL++ = LLW32 - (mem32 + (DWORD)(ip.pB+4 - code));
*ip.pL++ = LLW - (mem32 + (DWORD)(ip.pB+4 - code));
*ip.pB++ = 0x61; // popa
*ip.pB++ = 0x9d; // popf
*ip.pB++ = 0xc3; // ret
@ -250,10 +242,10 @@ void InjectDLL32( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
WriteProcessMemory( ppi->hProcess, mem, code, len, NULL );
FlushInstructionCache( ppi->hProcess, mem, len );
VirtualProtectEx( ppi->hProcess, mem, len, PAGE_EXECUTE, &pr );
#ifdef _WIN64
if (entry)
return;
#endif
if (eip)
{
context.Eip = mem32;
SetThreadContext( ppi->hThread, &context );
}
}

157
injdll64.c
View File

@ -17,17 +17,97 @@
#include "ansicon.h"
extern DWORD LLW64r;
extern LPVOID kernel32_base;
extern PIMAGE_DOS_HEADER pDosHeader;
#define MakeVA( cast, offset ) (cast)((DWORD_PTR)pDosHeader + (DWORD)(offset))
extern int export_cmp( const void* a, const void* b );
/*
Get the relative address of LoadLibraryW direct from kernel32.dll.
*/
BOOL get_LLW64r( void )
{
HMODULE kernel32;
TCHAR buf[MAX_PATH];
UINT len;
PIMAGE_NT_HEADERS pNTHeader;
PIMAGE_EXPORT_DIRECTORY pExportDir;
PDWORD fun_table, name_table;
PWORD ord_table;
PDWORD pLLW;
len = GetSystemDirectory( buf, MAX_PATH );
wcscpy( buf + len, L"\\kernel32.dll" );
kernel32 = LoadLibraryEx( buf, NULL, LOAD_LIBRARY_AS_IMAGE_RESOURCE );
if (kernel32 == NULL)
{
DEBUGSTR( 1, L"Unable to load 64-bit kernel32.dll!" );
return FALSE;
}
// The handle uses low bits as flags, so strip 'em off.
pDosHeader = (PIMAGE_DOS_HEADER)((DWORD_PTR)kernel32 & ~0xFFFF);
pNTHeader = MakeVA( PIMAGE_NT_HEADERS, pDosHeader->e_lfanew );
pExportDir = MakeVA( PIMAGE_EXPORT_DIRECTORY,
pNTHeader->OptionalHeader.
DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].
VirtualAddress );
fun_table = MakeVA( PDWORD, pExportDir->AddressOfFunctions );
name_table = MakeVA( PDWORD, pExportDir->AddressOfNames );
ord_table = MakeVA( PWORD, pExportDir->AddressOfNameOrdinals );
pLLW = bsearch( "LoadLibraryW", name_table, pExportDir->NumberOfNames,
sizeof(DWORD), export_cmp );
if (pLLW == NULL)
{
DEBUGSTR( 1, L"Could not find LoadLibraryW!" );
FreeLibrary( kernel32 );
return FALSE;
}
LLW64r = fun_table[ord_table[pLLW - name_table]];
FreeLibrary( kernel32 );
return TRUE;
}
void InjectDLL64( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
{
CONTEXT context;
DWORD len;
DWORD64 ep;
BOOL rip;
LPVOID mem;
DWORD pr;
DWORD64 LLW;
union
{
PBYTE pB;
PDWORD64 pL;
} ip;
struct unicode_string
{
USHORT Length;
USHORT MaximumLength;
DWORD64 Buffer;
};
struct ldr_module // incomplete definition
{
DWORD64 next, prev;
DWORD64 baseAddress;
DWORD64 entryPoint;
DWORD64 sizeOfImage;
struct unicode_string fullDllName;
struct unicode_string baseDllName;
} ldr;
WCHAR basename[MAX_PATH];
DWORD len;
#define CODESIZE 92
static BYTE code[CODESIZE+TSIZE(MAX_PATH)] = {
0,0,0,0,0,0,0,0, // original rip
@ -78,19 +158,86 @@ void InjectDLL64( LPPROCESS_INFORMATION ppi, LPCTSTR dll )
CopyMemory( code + CODESIZE, dll, len );
len += CODESIZE;
context.ContextFlags = CONTEXT_CONTROL;
context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
GetThreadContext( ppi->hThread, &context );
mem = VirtualAllocEx( ppi->hProcess, NULL, len, MEM_COMMIT,
PAGE_EXECUTE_READWRITE );
LLW = (DWORD64)LoadLibraryW;
PAGE_READWRITE );
ip.pB = code;
*ip.pL++ = context.Rip;
// Determine the base address of kernel32.dll. If injecting into the parent
// process, the base has already been determined. Otherwise, use the PEB to
// walk the loaded modules.
if (kernel32_base != 0)
{
ep = context.Rip;
rip = TRUE;
}
else
{
// When a process is created suspended, RCX has the entry point and RDX
// points to the PEB.
if (!ReadProcessMemory( ppi->hProcess, (LPVOID)(context.Rdx + 0x18),
ip.pL, 8, NULL ))
{
DEBUGSTR( 1, L"Failed to read Ldr from PEB." );
return;
}
ep = context.Rcx;
rip = FALSE;
// In case we're a bit slow (which seems to be unlikely), set up an
// infinite loop as the entry point.
WriteProcessMemory( ppi->hProcess, (PBYTE)mem + 16, "\xEB\xFE", 2, NULL );
FlushInstructionCache( ppi->hProcess, (PBYTE)mem + 16, 2 );
context.Rcx = (DWORD64)mem + 16;
SetThreadContext( ppi->hThread, &context );
VirtualProtectEx( ppi->hProcess, mem, len, PAGE_EXECUTE, &pr );
// Now resume the thread, as the PEB hasn't even been created yet.
ResumeThread( ppi->hThread );
while (*ip.pL == 0)
{
Sleep( 0 );
ReadProcessMemory( ppi->hProcess, (LPVOID)(context.Rdx + 0x18),
ip.pL, 8, NULL );
}
// Read PEB_LDR_DATA.InInitializationOrderModuleList.Flink.
ReadProcessMemory( ppi->hProcess, (LPVOID)(*ip.pL + 0x30),
&ip.pL[1], 8, NULL );
// Sometimes we're so quick ntdll.dll is the only one present, so keep
// looping until kernel32.dll shows up.
for (;;)
{
ldr.next = ip.pL[1];
do
{
ReadProcessMemory( ppi->hProcess, (LPVOID)ldr.next,
&ldr, sizeof(ldr), NULL );
ReadProcessMemory( ppi->hProcess, (LPVOID)ldr.baseDllName.Buffer,
basename, ldr.baseDllName.MaximumLength, NULL );
if (_wcsicmp( basename, L"kernel32.dll" ) == 0)
{
kernel32_base = (LPVOID)ldr.baseAddress;
goto gotit;
}
} while (ldr.next != *ip.pL + 0x30);
}
gotit:
SuspendThread( ppi->hThread );
VirtualProtectEx( ppi->hProcess, mem, len, pr, &pr );
}
LLW = (DWORD64)kernel32_base + LLW64r;
kernel32_base = 0;
*ip.pL++ = ep;
*ip.pL++ = LLW;
WriteProcessMemory( ppi->hProcess, mem, code, len, NULL );
FlushInstructionCache( ppi->hProcess, mem, len );
VirtualProtectEx( ppi->hProcess, mem, len, PAGE_EXECUTE, &pr );
if (rip)
{
context.Rip = (DWORD64)mem + 16;
SetThreadContext( ppi->hThread, &context );
}
}