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hentei 0 Newbie Poster

The addres stored in ebx is the addres of the system function in the msvcrt.dll library. But this code doesnt work, when i try debbuging it, at the call it says that the addres is unreadable. What is wrong?
Sorry for my english and also for my question if its too silly.

section .data

	command: db "cmd"

section .text

	global main

   main:
	
	push command
	mov ebx,0x77bf93c7
	call ebx
	add esp,4
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