obfuscate_hello_world.asm

section .text
    global _start

    _start:
        call obfuscate

    str1:
        msg     db 'Hello World!',0xa
        len     equ $ - msg

    obfuscate:
        mov     edx,len                             ;message length
        pop     ecx                                 ;ecx is now a pointer to msg
        mov     ebx,1                               ;file descriptor (stdout)
        mov     eax,4                               ;system call number (sys_write)
        int     0x80                                ;call kernel

        mov     eax,1                               ;system call number (sys_exit)
        int     0x80                                ;call kernel