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1922 lines (1465 loc) · 42.9 KB
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;----------------------------------------------------------------
;
; Vaccine Toolkit for C language (Version 2.0)
;
; (저) 1994 안 철 수
;
;----------------------------------------------------------------
.MODEL SMALL
.STACK 100h
.DATA
PUBLIC _wErrCode
_wErrCode DW 0
ParaBlk DW 5 DUP (?)
sBuffer DB 200h DUP (?)
sExeHead DB 20h DUP (?)
lOldLn DD ?
wTemp DW ?
.CODE
Arg1 EQU [bp + 4]
Arg2 EQU [bp + 6]
Arg3 EQU [bp + 8]
PUBLIC _CheckBootVirusInMem, _CureBootVirusInMem
PUBLIC _CheckBootVirusInMBS, _CureBootVirusInMBS
PUBLIC _CheckBootVirusInDBS, _CureBootVirusInDBS
PUBLIC _CheckFileVirusInMem, _CureFileVirusInMem
PUBLIC _CheckFileType
PUBLIC _CheckFileVirusInCOM, _CureFileVirusInCOM
PUBLIC _CheckFileVirusInEXE, _CureFileVirusInEXE
;-----------------------------------------------------------
_CheckBootVirusInMem PROC
; Function : check boot virus in memory
; Call with: address of diagnostic data structure
; Returns : AX = 0 (virus not found)
; 1 (virus found)
push bp
mov bp, sp
push cx
push si
push di
push es
mov si, Arg1
int 12h
mov cl, 6 ; segment address
shl ax, cl ; = (size in KB) X 64
mov es, ax
xor di, di
call CompareString
mov _wErrCode, 0
pop es
pop di
pop si
pop cx
pop bp
ret
_CheckBootVirusInMem ENDP
;-----------------------------------------------------------
_CureBootVirusInMem PROC
; Function : disable boot virus in memory
; Call with: virus type
; address of treatment data
; Returns: if function successful,
; AX = 0
; if function unsuccessful,
; AX = -1
; wErrCode = 1 (invalid virus type)
push bp
mov bp, sp
push cx
push si
push di
mov ax, Arg1
mov si, Arg2
cmp ax, 0
je BvMem0
cmp ax, 10h
je BvMem10
jmp ErTyBvMem
BvMem0: lodsw
push si
mov si, ax
push ds
int 12h
mov cl, 6
shl ax, cl
mov ds, ax
mov di, 13h
call ResetIntA
pop ds
pop si
jmp ReMemSize
BvMem10: lodsw
push si
mov si, ax
mov di, 13h
call ResetIntI
pop si
ReMemSize:push es
xor ax, ax
mov es, ax
lodsw
add es:[413h], ax
pop es
xor ax, ax
mov _wErrCode, 0
ExCuBvMem:pop di
pop si
pop cx
pop bp
ret
ErTyBvMem:mov ax, -1
mov _wErrCode, 1
jmp ExCuBvMem
_CureBootVirusInMem ENDP
;-----------------------------------------------------------
_CheckBootVirusInMBS PROC
; Function : check boot virus in master boot sector
; Call with: drive (0 = A, 1 = B, etc)
; address of diagnostic string
; Returns: if function successful,
; AX = 0 (virus not found)
; 1 (virus found)
; if function unsuccessful,
; AX = -1
; wErrCode = 2 (disk read error)
push bp
mov bp, sp
push bx
push dx
push si
push di
mov dx, Arg1
cmp dl, 2
jb RdMbs
add dl, 7Eh
RdMbs: mov bx, OFFSET sBuffer
call ReadMBS
jc ErRdMbs
mov si, Arg2
mov di, OFFSET sBuffer
call CompareString
mov _wErrCode, 0
ExChBvMbs:pop di
pop si
pop dx
pop bx
pop bp
ret
ErRdMbs: mov ax, -1
mov _wErrCode, 2
jmp ExChBvMbs
_CheckBootVirusInMBS ENDP
;-----------------------------------------------------------
_CureBootVirusInMBS PROC
; Function : cure boot virus in master boot sector
; Call with: drive (0 = A, 1 = B, etc)
; virus type
; address of treatment string
; Returns: if function successful,
; AX = 0
; if function unsuccessful,
; AX = -1
; wErrCode = 1 (invalid virus type)
; 2 (disk read error)
; 3 (disk write error)
push bp
mov bp, sp
push bx
push cx
push dx
push si
mov dx, Arg1
cmp dl, 2
jb ChkTyMbs
add dl, 7Eh
ChkTyMbs: mov ax, Arg2
mov si, Arg3
cmp ax, 0
je BvMbs0
cmp ax, 10h
je BvMbs10
jmp ErTyMbs
BvMbs0: lodsb
mov ch, al
lodsb
mov dh, al
lodsb
mov cl, al
jmp RdOldMbs
BvMbs10: lodsw
mov bx, ax
mov ch, sBuffer[bx]
lodsw
mov bx, ax
mov dh, sBuffer[bx]
lodsw
mov bx, ax
mov cl, sBuffer[bx]
lodsb
add cl, al
RdOldMbs: mov al, 1
mov bx, OFFSET sBuffer
call ReadPhysicalSector
jc ErRdMbsCu
call WriteMBS
jc ErWtMbsCu
xor ax, ax
mov _wErrCode, 0
ExCuBvMbs:pop si
pop dx
pop cx
pop bx
pop bp
ret
ErTyMbs: mov ax, -1
mov _wErrCode, 1
jmp ExCuBvMbs
ErRdMbsCu:mov ax, -1
mov _wErrCode, 2
jmp ExCuBvMbs
ErWtMbsCu:mov ax, -1
mov _wErrCode, 3
jmp ExCuBvMbs
_CureBootVirusInMBS ENDP
;-----------------------------------------------------------
_CheckBootVirusInDBS PROC
; Function : check boot virus in DOS boot sector
; Call with: drive (0 = A, 1 = B, etc)
; address of diagnostic string
; Returns: if function successful,
; AX = 0 (virus not found)
; 1 (virus found)
; if function unsuccessful,
; AX = -1
; wErrCode = 2 (disk read error)
push bp
mov bp, sp
push bx
push si
push di
mov ax, Arg1
mov bx, OFFSET sBuffer
call ReadDBS
jc ErRdDbs
mov si, Arg2
mov di, OFFSET sBuffer
call CompareString
mov _wErrCode, 0
ExChBvDbs:pop di
pop si
pop bx
pop bp
ret
ErRdDbs: mov ax, -1
mov _wErrCode, 2
jmp ExChBvDbs
_CheckBootVirusInDBS ENDP
;-----------------------------------------------------------
_CureBootVirusInDBS PROC
; Function : cure boot virus in DOS boot sector
; Call with: drive (0 = A, 1 = B, etc)
; virus type
; address of treatment string
; Returns: if function successful,
; AX = 0
; if function unsuccessful,
; AX = -1
; wErrCode = 1 (invalid virus type)
; 2 (disk read error)
; 3 (disk write error)
push bp
mov bp, sp
push bx
push cx
push dx
push es
mov ax, Arg2
mov si, Arg3
cmp ax, 80h
je BvDbs1
cmp ax, 90h
je BvDbs1
cmp ax, 0A0h
je BvDbsA0
cmp ax, 0B0h
je BvDbsB0
jmp ErTyDbs
BvDbs1: mov dx, Arg1
cmp dl, 2
jb ChkBvDbs1
add dl, 7Eh
ChkBvDbs1:cmp ax, 90h
je BvDbs90
lodsb
mov ch, al
lodsb
mov dh, al
lodsb
mov cl, al
jmp RdOldDbs1
BvDbs90: lodsw
mov bx, ax
mov ch, sBuffer[bx]
lodsw
mov bx, ax
mov dh, sBuffer[bx]
lodsw
mov bx, ax
mov cl, sBuffer[bx]
lodsb
add cl, al
RdOldDbs1:mov al, 1
mov bx, OFFSET sBuffer
call ReadPhysicalSector
jnc WtOldDbs
jmp ErRdDbsCu
BvDbsA0: lodsw
mov dx, ax
jmp RdOldDbs2
BvDbsB0: lodsw
mov bx, ax
mov dx, WORD PTR sBuffer[bx]
lodsw
add dx, ax
RdOldDbs2:mov al, Arg1
mov bx, OFFSET sBuffer
mov cx, 0001
call ReadLogicalSector
jc ErRdDbsCu
WtOldDbs: mov al, Arg1
call WriteDBS
jc ErWtDbsCu
xor ax, ax
mov _wErrCode, 0
ExCuBvDbs:pop es
pop dx
pop cx
pop bx
pop bp
ret
ErTyDbs: mov ax, -1
mov _wErrCode, 1
jmp ExCuBvDbs
ErRdDbsCu:mov ax, -1
mov _wErrCode, 2
jmp ExCuBvDbs
ErWtDbsCu:mov ax, -1
mov _wErrCode, 3
jmp ExCuBvDbs
_CureBootVirusInDBS ENDP
;-----------------------------------------------------------
_CheckFileVirusInMem PROC
; Function : check file virus in memory
; Call with: address of diagnostic string
; Returns : AX = 0 (virus not found)
; AX = 1 (virus found)
push bp
mov bp, sp
push si
push di
push es
mov si, Arg1
xor ax, ax
mov es, ax
xor di, di
mov es, es:[86h]
call CompareString
mov _wErrCode, 0
pop es
pop di
pop si
pop bp
ret
_CheckFileVirusInMem ENDP
;-----------------------------------------------------------
_CureFileVirusInMem PROC
; Function : disable file virus in memory
; Call with: virus type
; address of treatment string
; Returns: if function successful,
; AX = 0
; if function unsuccessful,
; AX = -1
; wErrCode = 1 (invalid virus type)
push bp
mov bp, sp
push si
push di
mov ax, Arg1
mov si, Arg2
cmp al, 80h
je FvMem80
jmp ErTyFvMem
FvMem80: lodsw
mov si, ax
push ds
xor ax, ax
mov ds, ax
mov ds, ds:[86h]
mov di, 21h
call ResetIntA
pop ds
xor ax, ax
mov _wErrCode, 0
ExCuFvMem:pop di
pop si
pop bp
ret
ErTyFvMem:mov ax, -1
mov _wErrCode, 1
jmp ExCuFvMem
_CureFileVirusInMem ENDP
;-----------------------------------------------------------
_CheckFileType PROC
; Function : check the type of the file
; Call with: DS:DX = address of ASCIIZ filename
; Returns: if function successful,
; AX = 0 (COM file)
; 1 (EXE file)
; if function unsuccessful,
; AX = -1
; wErrCode = 4 (open error)
; 5 (file read error)
push bp
mov bp, sp
push bx
push cx
push dx
call OpenFileForRead
jc ErOpFile
mov bx, ax
mov cx, 2
mov dx, OFFSET wTemp
call ReadFile
jc ErRdFile
call CloseFile
cmp WORD PTR wTemp, 'MZ'
je ExeFile
cmp WORD PTR wTemp, 'ZM'
je ExeFile
xor ax, ax
mov _wErrCode, 0
jmp ExChFile
ExeFile: mov ax, 1
mov _wErrCode, 0
ExChFile: pop dx
pop cx
pop bx
pop bp
ret
ErOpFile: mov ax, -1
mov _wErrCode, 4
jmp ExChFile
ErRdFile: mov ax, -1
mov _wErrCode, 5
jmp ExChFile
_CheckFileType ENDP
;-----------------------------------------------------------
_CheckFileVirusInCOM PROC
; Function : check file virus in COM file
; Call with: address of ASCIIZ filename
; address of diagnostic string
; Returns: if function successful,
; AX = 0 (virus not found)
; 1 (virus found)
; if function unsuccessful,
; AX = -1
; wErrCode = 4 (open error)
; 5 (file read error)
push bp
mov bp, sp
push bx
push cx
push dx
push si
push di
mov dx, Arg1
call OpenFileForRead
jc ErOpCom
mov bx, ax
mov cx, 200h
mov dx, OFFSET sBuffer
call ReadFile
Jc ErRdCom
mov cx, 3
mov dx, 2
mov si, OFFSET sBuffer
ChkJmp: lodsb
inc dx
cmp al, 0E9h
je CalComE
cmp al, 0E8h
je CalComE
loop ChkJmp
jmp ClsCom
CalComE: lodsw
add dx, ax
xor cx, cx
call SetFilePointer
mov cx, 200h
mov dx, OFFSET sBuffer
call ReadFile
jc ErRdCom
ClsCom: call CloseFile
mov si, Arg2
mov di, OFFSET sBuffer
call CompareString
mov _wErrCode, 0
ExChFvCom:pop di
pop si
pop dx
pop cx
pop bx
pop bp
ret
ErOpCom: mov ax, -1
mov _wErrCode, 4
jmp ExChFvCom
ErRdCom: mov ax, -1
mov _wErrCode, 5
jmp ExChFvCom
_CheckFileVirusInCOM ENDP
;-----------------------------------------------------------
_CureFileVirusInCOM PROC
; Function : cure file virus in COM file
; Call with: address of ASCIIZ filename
; virus type
; address of treatment string
; Returns: if function successful,
; AX = 0
; if function unsuccessful,
; AX = -1
; wErrCode = 1 (invalid virus type)
; 4 (open error)
; 5 (file read error)
; 6 (file write error)
; 7 (set attribute error)
; 8 (delete error)
; 9 (insufficient memory)
push bp
mov bp, sp
push bx
push cx
push dx
push si
mov dx, Arg1
xor cx, cx
call SetFileAttr
jnc DelCom
jmp ErAtComCu
DelCom: cmp WORD PTR Arg2, 0
jne OpComCu
mov dx, Arg1
call DeleteFile
jc ErDCC
jmp ScCuCom
ErDCC: jmp ErDlComCu
OpComCu: mov dx, Arg1
call OpenFileForWrite
jnc ReadCom
jmp ErOpComCu
ReadCom: mov bx, ax
mov cx, 200h
mov dx, OFFSET sBuffer
call ReadFile
jnc ChkTyCom1
jmp ErRdComCu
ChkTyCom1:mov ax, Arg2
cmp ax, 10h
je AppdType
cmp ax, 20h
je AppdType
cmp ax, 30h
je PT
cmp ax, 40h
je PT
ErTC: jmp ErTyCom
PT: jmp PrpdType
AppdType: mov cx, 3
mov dx, 2
mov si, OFFSET sBuffer
ChkJmpCu: lodsb
inc dx
cmp al, 0E9h
je CalComECu
cmp al, 0E8h
je CalComECu
loop ChkJmpCu
jmp ErTC
CalComECu:lodsw
add dx, ax
mov si, Arg3
lodsw
sub dx, ax
mov WORD PTR lOldLn, dx
lodsw
add dx, ax
xor cx, cx
call SetFilePointer
lodsw
mov cx, ax
mov dx, OFFSET sBuffer
call ReadFile
jnc RprCom1
jmp ErRdComCu
RprCom1: call SetFPtoStart
mov cx, [si - 2]
mov dx, OFFSET sBuffer
call WriteFile
jnc ChkTyCom2
jmp ErWtComCu
ChkTyCom2:cmp WORD PTR Arg2, 10h
jne AdjFS
jmp ClComCu
AdjFS: jmp AdjstFS
PrpdType: mov si, Arg3
mov dx, [si + 2]
xor cx, cx
call SetReadWord
jnc GetOldLn
jmp ErRdComCu
GetOldLn: mov WORD PTR lOldLn, ax
mov cx, ax
lodsw
mov dx, ax
cmp WORD PTR Arg2, 40h
jne AllocMem
cmp dx, cx
jae AllocMem
xchg dx, cx
AllocMem: push cx
xor cx, cx
call SetFilePointer
pop cx
push bx
mov ah, 48h
mov bx, 1000h
int 21h
pop bx
jnc RdOldCom
jmp ErMmComCu
RdOldCom: push ds
push es
mov es, ax
push es
pop ds
xor dx, dx
call ReadFile
jnc RprCom2
mov ah, 49h
int 21h
pop es
pop ds
jmp ErRdComCu
RprCom2: call SetFPtoStart
call WriteFile
jnc DeMem
mov ah, 49h
int 21h
pop es
pop ds
jmp ErWtComCu
DeMem: mov ah, 49h
int 21h
pop es
pop ds
AdjstFS: mov dx, WORD PTR lOldLn
xor cx, cx
call AdjustFileSize
ClComCu: call CloseFile
ScCuCom: xor ax, ax
mov _wErrCode, 0
ExCuFvCom:pop si
pop dx
pop cx
pop bx
pop bp
ret
ErTyCom: mov ax, -1
mov _wErrCode, 1
jmp ExCuFvCom
ErOpComCu:mov ax, -1
mov _wErrCode, 4
jmp ExCuFvCom
ErRdComCu:mov ax, -1
mov _wErrCode, 5
jmp ExCuFvCom
ErWtComCu:mov ax, -1
mov _wErrCode, 6
jmp ExCuFvCom
ErAtComCu:mov ax, -1
mov _wErrCode, 7
jmp ExCuFvCom
ErDlComCu:mov ax, -1
mov _wErrCode, 8
jmp ExCuFvCom
ErMmComCu:mov ax, -1
mov _wErrCode, 9
jmp ExCuFvCom
_CureFileVirusInCOM ENDP
;-----------------------------------------------------------
_CheckFileVirusInEXE PROC
; Function : check file virus in EXE file
; Call with: address of ASCIIZ filename
; address of diagnostic string
; Returns: if function successful,
; AX = 0 (virus not found)
; 1 (virus found)
; if function unsuccessful,
; AX = -1
; wErrCode = 4 (open error)
; 5 (file read error)
push bp
mov bp, sp
push bx
push cx
push dx
push si
push di
mov dx, Arg1
call OpenFileForRead
jc ErOpExe
mov bx, ax
mov cx, 20h
mov dx, OFFSET sExeHead
call ReadFile
jc ErRdExe
mov ax, WORD PTR sExeHead[8]
add ax, WORD PTR sExeHead[16h]
mov dx, 10h
mul dx
add ax, WORD PTR sExeHead[14h]
adc dx, 0
mov cx, dx ; pointer to entry
mov dx, ax
call SetFilePointer
mov cx, 200h
mov dx, OFFSET sBuffer
call ReadFile
jc ErRdExe
call CloseFile
mov si, Arg2
mov di, OFFSET sBuffer
call CompareString
mov _wErrCode, 0
ExChFvExe:pop di
pop si
pop dx
pop cx
pop bx
pop bp
ret
ErOpExe: mov ax, -1
mov _wErrCode, 4
jmp ExChFvExe
ErRdExe: mov ax, -1
mov _wErrCode, 5
jmp ExChFvExe
_CheckFileVirusInEXE ENDP
;-----------------------------------------------------------
_CureFileVirusInEXE PROC
; Function : cure file virus in EXE file
; Call with: address of ASCIIZ filename
; virus type
; address of treatment string
; Returns: if function successful,
; AX = 0
; if function unsuccessful,
; AX = -1
; wErrCode = 1 (invalid virus type)
; 4 (open error)
; 5 (file read error)
; 6 (file write error)
; 7 (set attribute error)
; 8 (delete error)
push bp
mov bp, sp