NASM

gistfile1.asm

extern   GetStdHandle
extern   WriteConsoleA
extern   ExitProcess

[SECTION .data]
   align 32
_dummy:
   dd   0
_message:
   db 'Hello, world!', 0dh, 0ah

[SECTION .text]
   global _MAIN__
_MAIN__:
   sub    rsp, 40
   mov    ecx, -11
   call   GetStdHandle
   mov    rcx, rax
   mov    rdx, _message
   mov    r8d, 15
   mov    r9, _dummy
   xor    eax, eax
   mov    [rsp-32], rax
   call   WriteConsoleA
   xor    ecx, ecx
   call   ExitProcess

; nasm -f win64 hello.asm

; link /subsystem:console hello.obj /defaultlib:Kernel32.lib /entry:_MAIN__