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fsd.cpp
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fsd.cpp
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/*
* Copyright (c) 2008 Arab Team 4 Reverse Engineering. All rights reserved.
*
* Module Name:
*
* fsd.c
*
* Abstract:
*
* This module implements various routines used to relocate image files.
*
* Author:
*
* GamingMasteR
*
*/
#include "KeDetective.h"
#include "fsd.h"
#include "module.h"
#include <scsi.h>
FSD_OBJECT FsdFastFat, FsdNtfs;
NTSTATUS
FsCallDriver(
PDRIVER_OBJECT DriverObject,
PDEVICE_OBJECT DeviceObject,
PIRP Irp
)
{
VMProtectBegin;
PIO_STACK_LOCATION IrpStackLocation;
NTSTATUS Status;
if (--Irp->CurrentLocation <= 0)
{
return STATUS_UNSUCCESSFUL;
}
IrpStackLocation = IoGetNextIrpStackLocation(Irp);
Irp->Tail.Overlay.CurrentStackLocation = IrpStackLocation;
IrpStackLocation->DeviceObject = DeviceObject;
if (DriverObject == NULL)
DriverObject = DeviceObject->DriverObject;
if (DriverObject == FsdFastFat.DriverObject && FsdFastFat.MajorFunction[IrpStackLocation->MajorFunction])
{
Print("Fastfat Call MJ[%d] %p", IrpStackLocation->MajorFunction, FsdFastFat.MajorFunction[IrpStackLocation->MajorFunction]);
Status = FsdFastFat.MajorFunction[IrpStackLocation->MajorFunction](DeviceObject, Irp);
}
else if (DriverObject == FsdNtfs.DriverObject && FsdNtfs.MajorFunction[IrpStackLocation->MajorFunction])
{
Print("Ntfs Call MJ[%d] %p", IrpStackLocation->MajorFunction, FsdNtfs.MajorFunction[IrpStackLocation->MajorFunction]);
Status = FsdNtfs.MajorFunction[IrpStackLocation->MajorFunction](DeviceObject, Irp);
}
else
{
Print("Normal Call MJ[%d] %p", IrpStackLocation->MajorFunction, DriverObject->MajorFunction[IrpStackLocation->MajorFunction]);
Status = DriverObject->MajorFunction[IrpStackLocation->MajorFunction](DeviceObject, Irp);
}
VMProtectEnd;
return Status;
};
BOOLEAN GetDriveObject(
IN ULONG DriveNumber,
OUT PDEVICE_OBJECT *DeviceObject,
OUT PDEVICE_OBJECT *RealDevice
)
{
WCHAR driveName[] = L"\\DosDevices\\A:\\";
UNICODE_STRING deviceName;
HANDLE deviceHandle;
OBJECT_ATTRIBUTES objectAttributes;
IO_STATUS_BLOCK ioStatus;
PFILE_OBJECT fileObject;
NTSTATUS status;
if (DriveNumber >= 'A' && DriveNumber <= 'Z')
{
driveName[12] = (CHAR)DriveNumber;
}
else if (DriveNumber >= 'a' && DriveNumber <= 'z')
{
driveName[12] = (CHAR)DriveNumber - 'a' + 'A';
}
else
{
return FALSE;
}
RtlInitUnicodeString(&deviceName, driveName);
InitializeObjectAttributes(&objectAttributes,
&deviceName,
OBJ_CASE_INSENSITIVE,
NULL,
NULL);
status = IoCreateFile( &deviceHandle,
SYNCHRONIZE | FILE_ANY_ACCESS,
&objectAttributes,
&ioStatus,
NULL,
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_SYNCHRONOUS_IO_NONALERT | FILE_DIRECTORY_FILE,
NULL,
0,
CreateFileTypeNone,
NULL,
0x100);
if (!NT_SUCCESS(status))
{
Print("Could not open drive %c: %x\n", DriveNumber, status);
return FALSE;
}
status = ObReferenceObjectByHandle(deviceHandle,
SYNCHRONIZE,
*IoFileObjectType,
KernelMode,
(PVOID *)&fileObject,
NULL);
if (!NT_SUCCESS(status))
{
Print("Could not get fileobject from handle: %c\n", DriveNumber);
ZwClose(deviceHandle);
return FALSE;
}
if (fileObject->Vpb == 0 || fileObject->Vpb->RealDevice == NULL)
{
ObDereferenceObject(fileObject);
ZwClose(deviceHandle);
return FALSE;
}
*DeviceObject = fileObject->Vpb->DeviceObject;
*RealDevice = fileObject->Vpb->RealDevice;
ObDereferenceObject(fileObject);
ZwClose(deviceHandle);
return TRUE;
}
NTSTATUS
IoCompletionRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Context
)
{
*Irp->UserIosb = Irp->IoStatus;
if (Irp->MdlAddress)
{
MmUnlockPages(Irp->MdlAddress);
IoFreeMdl(Irp->MdlAddress);
Irp->MdlAddress = NULL;
}
if (Irp->UserEvent)
KeSetEvent(Irp->UserEvent, IO_NO_INCREMENT, 0);
IoFreeIrp(Irp);
return STATUS_MORE_PROCESSING_REQUIRED;
}
/*NTSTATUS
IoReadFile(
HANDLE Handle,
PFILE_OBJECT FileObject,
PVOID Buffer,
ULONG FileSize
)
{
VMProtectBegin;
NTSTATUS Status = STATUS_SUCCESS;
PDEVICE_OBJECT DeviceObject;
PIRP Irp;
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
LARGE_INTEGER StartingOffset;
if (FileObject) Print("PointerCount = %d", OBJECT_TO_OBJECT_HEADER(FileObject)->ReferenceCount);
if (Handle)
{
Status = ObReferenceObjectByHandle(Handle,
SYNCHRONIZE,
*IoFileObjectType,
KernelMode,
(PVOID*)&FileObject,
NULL);
if (!NT_SUCCESS(Status)) return Status;
}
if (FileObject) Print("PointerCount = %d", OBJECT_TO_OBJECT_HEADER(FileObject)->ReferenceCount);
DeviceObject = IoGetBaseFileSystemDeviceObject(FileObject);
StartingOffset.QuadPart = 0;
KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
FileSize,
&StartingOffset,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
if (Handle)
ObDereferenceObject(FileObject);
return STATUS_UNSUCCESSFUL;
};
IoGetNextIrpStackLocation(Irp)->FileObject = FileObject;
IoGetNextIrpStackLocation(Irp)->Parameters.Read.Key = 0;
if (FileObject) Print("PointerCount = %d", OBJECT_TO_OBJECT_HEADER(FileObject)->ReferenceCount);
Status = FsCallDriver(DeviceObject, Irp);
if (FileObject) Print("PointerCount = %d", OBJECT_TO_OBJECT_HEADER(FileObject)->ReferenceCount);
if (STATUS_PENDING == Status)
KeWaitForSingleObject(&Event, Executive, KernelMode, TRUE, NULL);
if (Handle)
ObDereferenceObject(FileObject);
Status = IoStatusBlock.Status;
VMProtectEnd;
return Status;
};*/
NTSTATUS
IoReadFile(
HANDLE Handle,
PVOID Buffer,
ULONG FileSize,
PLARGE_INTEGER FileOffset
)
{
VMProtectBegin;
NTSTATUS Status = STATUS_SUCCESS;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
PIRP Irp;
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
LARGE_INTEGER StartingOffset;
Status = ObReferenceObjectByHandle(Handle,
SYNCHRONIZE,
*IoFileObjectType,
KernelMode,
(PVOID*)&FileObject,
NULL);
if (!NT_SUCCESS(Status)) return Status;
DeviceObject = IoGetBaseFileSystemDeviceObject(FileObject);
StartingOffset = *FileOffset;
KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
FileSize,
&StartingOffset,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ObDereferenceObject(FileObject);
return STATUS_UNSUCCESSFUL;
};
IoGetNextIrpStackLocation(Irp)->FileObject = FileObject;
IoGetNextIrpStackLocation(Irp)->Parameters.Read.Key = 0;
Status = FsCallDriver(NULL, DeviceObject, Irp);
if (STATUS_PENDING == Status)
KeWaitForSingleObject(&Event, Executive, KernelMode, TRUE, NULL);
ObDereferenceObject(FileObject);
Status = IoStatusBlock.Status;
VMProtectEnd;
return Status;
};
NTSTATUS
IoWriteFile(
HANDLE Handle,
PVOID Buffer,
ULONG FileSize,
PLARGE_INTEGER FileOffset
)
{
VMProtectBegin;
NTSTATUS Status = STATUS_SUCCESS;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
PIRP Irp;
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
LARGE_INTEGER StartingOffset;
Status = ObReferenceObjectByHandle(Handle,
SYNCHRONIZE,
*IoFileObjectType,
KernelMode,
(PVOID*)&FileObject,
NULL);
if (!NT_SUCCESS(Status)) return Status;
DeviceObject = IoGetBaseFileSystemDeviceObject(FileObject);
StartingOffset = *FileOffset;
KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_WRITE,
DeviceObject,
Buffer,
FileSize,
&StartingOffset,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ObDereferenceObject(FileObject);
return STATUS_UNSUCCESSFUL;
};
IoGetNextIrpStackLocation(Irp)->FileObject = FileObject;
IoGetNextIrpStackLocation(Irp)->Parameters.Write.Key = 0;
Status = FsCallDriver(NULL, DeviceObject, Irp);
if (STATUS_PENDING == Status)
KeWaitForSingleObject(&Event, Executive, KernelMode, TRUE, NULL);
ObDereferenceObject(FileObject);
Status = IoStatusBlock.Status;
VMProtectEnd;
return Status;
};
NTSTATUS
IrpFileCreate(
IN PUNICODE_STRING FileName,
IN ACCESS_MASK DesiredAccess,
IN ULONG FileAttributes,
IN ULONG ShareAccess,
IN ULONG CreateDisposition,
IN ULONG CreateOptions,
IN PDEVICE_OBJECT DeviceObject,
IN PDEVICE_OBJECT RealDevice,
OUT PFILE_OBJECT *Object
)
{
VMProtectBegin;
NTSTATUS status;
KEVENT event;
PIRP irp;
IO_STATUS_BLOCK ioStatus;
PIO_STACK_LOCATION irpSp;
IO_SECURITY_CONTEXT securityContext;
ACCESS_STATE accessState;
OBJECT_ATTRIBUTES objectAttributes;
PFILE_OBJECT fileObject;
PVOID auxData;
CSHORT fileObjectSize = sizeof(FILE_OBJECT);
if (!IsXp)
{
fileObjectSize += 0x10;
}
KeInitializeEvent(&event, SynchronizationEvent, FALSE);
irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
if (irp == NULL)
return STATUS_INSUFFICIENT_RESOURCES;
InitializeObjectAttributes(&objectAttributes, NULL, OBJ_CASE_INSENSITIVE, 0, NULL);
status = ObCreateObject(KernelMode,
*IoFileObjectType,
&objectAttributes,
KernelMode,
NULL,
fileObjectSize,
0,
0,
(PVOID *)&fileObject);
//Print("fileObject->Count = %d", OBJECT_TO_OBJECT_HEADER(fileObject)->ReferenceCount);
if (!NT_SUCCESS(status))
{
IoFreeIrp(irp);
return status;
}
RtlZeroMemory(fileObject, fileObjectSize);
fileObject->Type = IO_TYPE_FILE;
fileObject->Size = fileObjectSize;
fileObject->DeviceObject = RealDevice;
fileObject->RelatedFileObject = NULL;
fileObject->Flags = FO_SYNCHRONOUS_IO;
fileObject->FileName.MaximumLength = FileName->MaximumLength;
fileObject->FileName.Buffer = (PWSTR)ExAllocatePoolWithTag(NonPagedPool, FileName->MaximumLength, 'abiS');
if (fileObject->FileName.Buffer == NULL)
{
IoFreeIrp(irp);
ObDereferenceObject(fileObject);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyUnicodeString(&fileObject->FileName, FileName);
KeInitializeEvent(&fileObject->Lock, SynchronizationEvent, FALSE);
KeInitializeEvent(&fileObject->Event, NotificationEvent, FALSE);
irp->MdlAddress = NULL;
irp->Flags |= IRP_CREATE_OPERATION | IRP_SYNCHRONOUS_API;
irp->RequestorMode = KernelMode;
irp->UserIosb = &ioStatus;
irp->UserEvent = &event;
irp->PendingReturned = FALSE;
irp->Cancel = FALSE;
irp->CancelRoutine = NULL;
irp->Tail.Overlay.Thread = PsGetCurrentThread();
irp->Tail.Overlay.AuxiliaryBuffer = NULL;
irp->Tail.Overlay.OriginalFileObject = fileObject;
auxData = MmAlloc(PAGE_SIZE);
status = SeCreateAccessState( &accessState,
auxData,
DesiredAccess,
IoGetFileObjectGenericMapping());
MmFree(auxData);
accessState.PreviouslyGrantedAccess |= accessState.RemainingDesiredAccess;
accessState.RemainingDesiredAccess = 0;
if (!NT_SUCCESS(status))
{
IoFreeIrp(irp);
ExFreePoolWithTag(fileObject->FileName.Buffer, 'abiS');
ObDereferenceObject(fileObject);
return status;
}
securityContext.SecurityQos = NULL;
securityContext.AccessState = &accessState;
securityContext.DesiredAccess = DesiredAccess;
securityContext.FullCreateOptions = 0;
irpSp = IoGetNextIrpStackLocation(irp);
irpSp->MajorFunction = IRP_MJ_CREATE;
irpSp->DeviceObject = DeviceObject;
irpSp->FileObject = fileObject;
irpSp->Parameters.Create.SecurityContext = &securityContext;
irpSp->Parameters.Create.Options = (CreateDisposition << 24) | CreateOptions;
irpSp->Parameters.Create.FileAttributes = (USHORT)FileAttributes;
irpSp->Parameters.Create.ShareAccess = (USHORT)ShareAccess;
irpSp->Parameters.Create.EaLength = 0;
IoSetCompletionRoutine(irp, IoCompletionRoutine, NULL, TRUE, TRUE, TRUE);
status = FsCallDriver(NULL, DeviceObject, irp);
//Print("fileObject->Count = %d", OBJECT_TO_OBJECT_HEADER(fileObject)->ReferenceCount);
if (status == STATUS_PENDING)
KeWaitForSingleObject(&event, Executive, KernelMode, TRUE, NULL);
status = ioStatus.Status;
if (!NT_SUCCESS(status))
{
if (fileObject)
{
ExFreePoolWithTag(fileObject->FileName.Buffer, 'abiS');
fileObject->FileName.Length = 0;
fileObject->DeviceObject = NULL;
ObDereferenceObject(fileObject);
}
}
else
{
InterlockedIncrement(&fileObject->DeviceObject->ReferenceCount);
if (fileObject->Vpb)
{
InterlockedIncrement((LONG *)&fileObject->Vpb->ReferenceCount);
}
*Object = fileObject;
}
VMProtectEnd;
return status;
}
NTSTATUS
IrpFileDelete(
IN PFILE_OBJECT FileObject,
IN PDEVICE_OBJECT DeviceObject
)
{
VMProtectBegin;
NTSTATUS status;
KEVENT event;
PIRP irp;
IO_STATUS_BLOCK ioStatus;
PIO_STACK_LOCATION irpSp;
FILE_DISPOSITION_INFORMATION FileInformation;
KeInitializeEvent(&event, SynchronizationEvent, FALSE);
irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
if (irp == NULL)
return STATUS_INSUFFICIENT_RESOURCES;
irp->MdlAddress = NULL;
irp->Flags |= IRP_BUFFERED_IO | IRP_SYNCHRONOUS_API;
irp->RequestorMode = KernelMode;
irp->UserIosb = &ioStatus;
irp->UserEvent = &event;
irp->PendingReturned = FALSE;
irp->Cancel = FALSE;
irp->CancelRoutine = NULL;
irp->Tail.Overlay.Thread = PsGetCurrentThread();
irp->Tail.Overlay.AuxiliaryBuffer = NULL;
irp->Tail.Overlay.OriginalFileObject = FileObject;
irp->AssociatedIrp.SystemBuffer = &FileInformation;
FileInformation.DeleteFile = TRUE;
irpSp = IoGetNextIrpStackLocation(irp);
irpSp->MajorFunction = IRP_MJ_SET_INFORMATION;
irpSp->DeviceObject = DeviceObject;
irpSp->FileObject = FileObject;
irpSp->Parameters.SetFile.FileInformationClass = FileDispositionInformation;
irpSp->Parameters.SetFile.Length = sizeof(FILE_DISPOSITION_INFORMATION);
irpSp->Parameters.SetFile.FileObject = FileObject;
IoSetCompletionRoutine(irp, IoCompletionRoutine, NULL, TRUE, TRUE, TRUE);
status = FsCallDriver(NULL, DeviceObject, irp);
if (status == STATUS_PENDING)
KeWaitForSingleObject(&event, Executive, KernelMode, TRUE, NULL);
status = ioStatus.Status;
VMProtectEnd;
return status;
}
LARGE_INTEGER
IrpGetFileSize(
IN PFILE_OBJECT FileObject,
IN PDEVICE_OBJECT DeviceObject
)
{
NTSTATUS status;
KEVENT event;
PIRP irp;
IO_STATUS_BLOCK ioStatus;
PIO_STACK_LOCATION irpSp;
FILE_STANDARD_INFORMATION FileStdInformation;
RtlZeroMemory(&FileStdInformation, sizeof(FileStdInformation));
KeInitializeEvent(&event, SynchronizationEvent, FALSE);
irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
if (irp == NULL)
return FileStdInformation.EndOfFile;
irp->MdlAddress = NULL;
irp->Flags |= IRP_BUFFERED_IO | IRP_SYNCHRONOUS_API;
irp->RequestorMode = KernelMode;
irp->UserIosb = &ioStatus;
irp->UserEvent = &event;
irp->PendingReturned = FALSE;
irp->Cancel = FALSE;
irp->CancelRoutine = NULL;
irp->Tail.Overlay.Thread = PsGetCurrentThread();
irp->Tail.Overlay.AuxiliaryBuffer = NULL;
irp->Tail.Overlay.OriginalFileObject = FileObject;
irp->AssociatedIrp.SystemBuffer = &FileStdInformation;
irpSp = IoGetNextIrpStackLocation(irp);
irpSp->MajorFunction = IRP_MJ_QUERY_INFORMATION;
irpSp->DeviceObject = DeviceObject;
irpSp->FileObject = FileObject;
irpSp->Parameters.SetFile.FileInformationClass = FileStandardInformation;
irpSp->Parameters.SetFile.Length = sizeof(FileStdInformation);
irpSp->Parameters.SetFile.FileObject = FileObject;
IoSetCompletionRoutine(irp, IoCompletionRoutine, NULL, TRUE, TRUE, TRUE);
status = FsCallDriver(NULL, DeviceObject, irp);
if (status == STATUS_PENDING)
KeWaitForSingleObject(&event, Executive, KernelMode, TRUE, NULL);
status = ioStatus.Status;
return FileStdInformation.EndOfFile;
}
NTSTATUS
IoOpenFile(
HANDLE *Handle,
LPWSTR FileName,
ACCESS_MASK DesiredAccess,
ULONG ShareAccess,
ULONG CreateOptions,
ULONG CreateDisposition)
{
VMProtectBegin;
NTSTATUS Status;
UNICODE_STRING uniFileName;
PDEVICE_OBJECT deviceObject, realDevice;
WCHAR FullFilePath[MAX_PATH] = L"";
PFILE_OBJECT fileObject;
if (KeGetCurrentIrql() >= DISPATCH_LEVEL)
{
return STATUS_UNSUCCESSFUL;
}
if (!_wcsnicmp(FileName, L"\\Systemroot\\", wcslen(L"\\Systemroot\\")))
{
wcscpy(FullFilePath, SystemrootPath);
wcscat(FullFilePath, FileName + wcslen(L"\\Systemroot"));
}
else
{
wcscpy(FullFilePath, FileName);
}
if (!GetDriveObject(FullFilePath[0], &deviceObject, &realDevice))
{
return STATUS_UNSUCCESSFUL;
}
RtlInitUnicodeString(&uniFileName, FullFilePath + 2);
Status = IrpFileCreate(&uniFileName,
DesiredAccess,
FILE_ATTRIBUTE_NORMAL,
ShareAccess,
CreateDisposition,
CreateOptions,
deviceObject,
realDevice,
&fileObject);
if (!NT_SUCCESS(Status))
{
return Status;
}
Status = ObOpenObjectByPointer( fileObject,
0,
NULL,
DesiredAccess,
*IoFileObjectType,
KernelMode,
Handle);
VMProtectEnd;
return Status;
};
LONGLONG GetPortableFileSize(HANDLE Handle)
{
NTSTATUS Status;
PFILE_OBJECT FileObject;
LARGE_INTEGER FileSize;
FileSize.QuadPart = 0;
Status = ObReferenceObjectByHandle(Handle, SYNCHRONIZE, *IoFileObjectType, KernelMode, (PVOID *)&FileObject, NULL);
if (NT_SUCCESS(Status))
{
FileSize = IrpGetFileSize(FileObject, IoGetBaseFileSystemDeviceObject(FileObject));
ObDereferenceObject(FileObject);
}
return FileSize.QuadPart;
};
PVOID
LoadFile(
LPWSTR FileName,
PVOID ImageBase,
BOOLEAN FixIAT
)
{
VMProtectBegin;
PVOID rc = 0;
HANDLE hFile = 0;
NTSTATUS NtStatus = STATUS_SUCCESS;
LONGLONG szFile = 0;
PVOID FileCopy;
PIMAGE_NT_HEADERS nt;
ULONG cb;
ULONG i;
PIMAGE_SECTION_HEADER sec;
ULONG dwRlc = FALSE;
LARGE_INTEGER FileOffset;
FileOffset.QuadPart = 0;
if (ImageBase == NULL)
return NULL;
NtStatus = IoOpenFile(&hFile, FileName, SYNCHRONIZE, FILE_SHARE_READ, FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE, FILE_OPEN);
if (NT_SUCCESS(NtStatus))
{
szFile = GetPortableFileSize(hFile);
FileCopy = MmAlloc((ULONG)szFile);
if (FileCopy)
{
NtStatus = IoReadFile(hFile, FileCopy, (ULONG)szFile, &FileOffset);
if (NT_SUCCESS(NtStatus))
{
nt = (PIMAGE_NT_HEADERS)RtlImageNtHeader(FileCopy);
cb = nt->OptionalHeader.SizeOfImage;
rc = MmAlloc(cb);
if (rc)
{
memcpy(rc,FileCopy,nt->OptionalHeader.SizeOfHeaders);
sec = IMAGE_FIRST_SECTION(nt);
for (i = 0; i < nt->FileHeader.NumberOfSections; i++)
memcpy((PVOID)((ULONG)rc + sec[i].VirtualAddress),(PVOID)((ULONG)FileCopy + sec[i].PointerToRawData),sec[i].SizeOfRawData);
//Print("relocating %ls -> %p -> %p", FileName, ImageBase, cb);
dwRlc = LdrRelocateImage(rc, ImageBase, TRUE, -1, FALSE);
if (dwRlc == FALSE)
{
Print("failed to reloc %ls", FileName);
MmFree(rc);
MmFree(FileCopy);
ZwClose(hFile);
return 0;
}
if (FixIAT)
{
UNICODE_STRING Unicode;
RtlInitUnicodeString(&Unicode, FileName);
if (!NT_SUCCESS(ResolveImageReferences(rc, &Unicode)))
{
Print("FAIL :: IAT");
MmFree(rc);
MmFree(FileCopy);
ZwClose(hFile);
return 0;
};
};
MmFree(FileCopy);
};
};
};
ZwClose(hFile);
}
else
{
Print("Error = %p, LoadFile(%ws)", NtStatus, FileName);
}
VMProtectEnd;
return rc;
};
PVOID
LoadSystemFile(
LPSTR FileName,
PVOID ImageBase,
BOOLEAN FixIAT
)
{
VMProtectBegin;
PVOID rc;
WCHAR UnicodeString[MAX_PATH] = L"", Buffer[MAX_PATH];
if (!NT_SUCCESS(RtlMultiByteToUnicodeN(Buffer, MAX_PATH, 0, ExtractFileName(FileName), MAX_PATH)))
return 0;
wcsncpy(UnicodeString, SystemPath, MAX_PATH);
wcsncat(UnicodeString, Buffer, MAX_PATH);
rc = LoadFile(UnicodeString, ImageBase, FixIAT);
if (!rc)
{
memset(UnicodeString, 0, MAX_PATH * sizeof(WCHAR));
wcsncpy(UnicodeString, SystemPath L"drivers\\", MAX_PATH);
wcsncat(UnicodeString, Buffer, MAX_PATH);
rc = LoadFile(UnicodeString, ImageBase, FixIAT);
};
VMProtectEnd;
return rc;
};
PIMAGE_BASE_RELOCATION
LdrProcessRelocationBlock(
IN ULONG_PTR VA,
IN ULONG SizeOfBlock,
IN PUSHORT NextOffset,
IN LONG_PTR Diff
)
{
PUCHAR FixupVA;
USHORT Offset;
LONG Temp;
while (SizeOfBlock--)
{
Offset = *NextOffset & (USHORT)0xfff;
FixupVA = (PUCHAR)(VA + Offset);
//
// Apply the fixups.
//
switch ((*NextOffset) >> 12)
{
case IMAGE_REL_BASED_HIGHLOW :
//
// HighLow - (32-bits) relocate the high and low half
// of an address.
//
*(LONG UNALIGNED *)FixupVA += (ULONG) Diff;
break;
case IMAGE_REL_BASED_HIGH :
//
// High - (16-bits) relocate the high half of an address.
//
Temp = *(PUSHORT)FixupVA << 16;
Temp += (ULONG) Diff;
*(PUSHORT)FixupVA = (USHORT)(Temp >> 16);
break;
case IMAGE_REL_BASED_LOW :
//
// Low - (16-bit) relocate the low half of an address.
//
Temp = *(PSHORT)FixupVA;
Temp += (ULONG) Diff;
*(PUSHORT)FixupVA = (USHORT)Temp;
break;
case IMAGE_REL_BASED_DIR64:
*(ULONG_PTR UNALIGNED *)FixupVA += Diff;
break;
case IMAGE_REL_BASED_ABSOLUTE :
//
// Absolute - no fixup required.
//
break;
default :
//
// Illegal - illegal relocation type.
//
return (PIMAGE_BASE_RELOCATION)NULL;
}
++NextOffset;
}
return (PIMAGE_BASE_RELOCATION)NextOffset;
};
ULONG
LdrRelocateImage(
IN PVOID BaseAddress,
IN PVOID NewBase,
IN ULONG Success,
IN ULONG Conflict,
IN ULONG Invalid
)
{
LONG_PTR Diff;
ULONG TotalCountBytes;
ULONG_PTR VA;
ULONG_PTR OldBase;
ULONG SizeOfBlock;
PUSHORT NextOffset;
PIMAGE_NT_HEADERS NtHeaders;
PIMAGE_BASE_RELOCATION NextBlock;
NtHeaders = (PIMAGE_NT_HEADERS)RtlImageNtHeader(BaseAddress);
if (NtHeaders)
{
OldBase = NtHeaders->OptionalHeader.ImageBase;
}
else
{
return Invalid;
};
//
// Locate the relocation section.
//
NextBlock = (PIMAGE_BASE_RELOCATION)RtlImageDirectoryEntryToData(
BaseAddress, TRUE, IMAGE_DIRECTORY_ENTRY_BASERELOC, &TotalCountBytes);
if (!NextBlock || !TotalCountBytes)
{
//
// The image does not contain a relocation table, and therefore
// cannot be relocated.
//