├── .gitattributes ├── .gitignore ├── Example.png ├── LICENSE ├── MessageBoxAHookExample.cs ├── README.md └── SharpNativeDLL ├── SharpNativeDLL.sln └── SharpNativeDLL ├── EntryPoint.cs └── SharpNativeDLL.csproj /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | 4 | # User-specific files 5 | *.suo 6 | *.user 7 | *.sln.docstates 8 | 9 | # Build results 10 | 11 | [Dd]ebug/ 12 | [Rr]elease/ 13 | x64/ 14 | [Bb]in/ 15 | [Oo]bj/ 16 | 17 | # MSTest test Results 18 | [Tt]est[Rr]esult*/ 19 | [Bb]uild[Ll]og.* 20 | 21 | *_i.c 22 | *_p.c 23 | *_i.h 24 | *.ilk 25 | *.meta 26 | *.obj 27 | *.pch 28 | *.pdb 29 | *.pgc 30 | *.pgd 31 | *.rsp 32 | *.sbr 33 | *.tlb 34 | *.tli 35 | *.tlh 36 | *.tmp 37 | *.tmp_proj 38 | *.log 39 | *.vspscc 40 | *.vssscc 41 | .builds 42 | *.pidb 43 | *.log 44 | *.svclog 45 | *.scc 46 | 47 | # Visual C++ cache files 48 | ipch/ 49 | *.aps 50 | *.ncb 51 | *.opensdf 52 | *.sdf 53 | *.cachefile 54 | 55 | # Visual Studio profiler 56 | *.psess 57 | *.vsp 58 | *.vspx 59 | 60 | # Guidance Automation Toolkit 61 | *.gpState 62 | 63 | # ReSharper is a .NET coding add-in 64 | _ReSharper*/ 65 | *.[Rr]e[Ss]harper 66 | *.DotSettings.user 67 | 68 | # Click-Once directory 69 | publish/ 70 | 71 | # Publish Web Output 72 | *.Publish.xml 73 | *.pubxml 74 | *.azurePubxml 75 | 76 | # NuGet Packages Directory 77 | ## TODO: If you have NuGet Package Restore enabled, uncomment the next line 78 | packages/ 79 | ## TODO: If the tool you use requires repositories.config, also uncomment the next line 80 | !packages/repositories.config 81 | 82 | # Windows Azure Build Output 83 | csx/ 84 | *.build.csdef 85 | 86 | # Windows Store app package directory 87 | AppPackages/ 88 | 89 | # Others 90 | sql/ 91 | *.Cache 92 | ClientBin/ 93 | [Ss]tyle[Cc]op.* 94 | ![Ss]tyle[Cc]op.targets 95 | ~$* 96 | *~ 97 | *.dbmdl 98 | *.[Pp]ublish.xml 99 | 100 | *.publishsettings 101 | 102 | # RIA/Silverlight projects 103 | Generated_Code/ 104 | 105 | # Backup & report files from converting an old project file to a newer 106 | # Visual Studio version. Backup files are not needed, because we have git ;-) 107 | _UpgradeReport_Files/ 108 | Backup*/ 109 | UpgradeLog*.XML 110 | UpgradeLog*.htm 111 | 112 | # SQL Server files 113 | App_Data/*.mdf 114 | App_Data/*.ldf 115 | 116 | # ========================= 117 | # Windows detritus 118 | # ========================= 119 | 120 | # Windows image file caches 121 | Thumbs.db 122 | ehthumbs.db 123 | 124 | # Folder config file 125 | Desktop.ini 126 | 127 | # Recycle Bin used on file shares 128 | $RECYCLE.BIN/ 129 | 130 | # Mac desktop service store files 131 | .DS_Store 132 | *.lock 133 | *.ide 134 | */.vs 135 | *.v2 136 | *.db 137 | *.v1 -------------------------------------------------------------------------------- /Example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ZeroLP/SharpNativeDLL/7ba03bbcb61d21cb7ee30744f709b9774c696bee/Example.png -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /MessageBoxAHookExample.cs: -------------------------------------------------------------------------------- 1 | using System.Runtime.CompilerServices; 2 | using System.Runtime.InteropServices; 3 | using System.Text; 4 | 5 | namespace SharpNativeDLL 6 | { 7 | public class MessageBoxAHookExample 8 | { 9 | private const uint DLL_PROCESS_DETACH = 0, 10 | DLL_PROCESS_ATTACH = 1, 11 | DLL_THREAD_ATTACH = 2, 12 | DLL_THREAD_DETACH = 3; 13 | 14 | [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] 15 | private static extern int MessageBoxA(IntPtr hWnd, string text, string caption, uint type); 16 | 17 | [DllImport("kernel32.dll")] 18 | private static extern bool VirtualProtect(IntPtr lpAddress, UIntPtr dwSize, uint flNewProtect, out uint lpflOldProtect); 19 | 20 | 21 | [UnmanagedCallersOnly(EntryPoint = "DllMain", CallConvs = new[] { typeof(CallConvStdcall) })] 22 | public static bool DllMain(IntPtr hModule, uint ul_reason_for_call, IntPtr lpReserved) 23 | { 24 | switch (ul_reason_for_call) 25 | { 26 | case DLL_PROCESS_ATTACH: 27 | HookMessageBoxA(); 28 | MessageBoxA(0, "DLL_PROCESS_ATTACH", "Your kind @", 0); 29 | break; 30 | default: 31 | break; 32 | } 33 | return true; 34 | } 35 | 36 | private static byte[] OriginalFunctionInstructions; 37 | private static IntPtr OriginalFunctionAddress; 38 | 39 | private static byte[] HookInstructions = new byte[] 40 | { 41 | 0x49, 0xBA, //movabs r10 42 | 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, //[QWORD] 43 | 0x41, 0xFF, 0xE2 //jmp r10 44 | }; 45 | 46 | private unsafe static void HookMessageBoxA() 47 | { 48 | delegate* unmanaged[Cdecl] hookedMessageBoxA = &HMessageBoxA; 49 | OriginalFunctionAddress = NativeLibrary.GetExport(NativeLibrary.Load("User32.dll"), "MessageBoxA"); 50 | 51 | //Copy original instructions 52 | OriginalFunctionInstructions = new byte[HookInstructions.Length]; 53 | fixed (byte* origIptr = OriginalFunctionInstructions) 54 | CopyMemory((byte*)OriginalFunctionAddress, origIptr, OriginalFunctionInstructions.Length); 55 | 56 | //Hook 57 | fixed(void* hkIstrPtr = HookInstructions) 58 | { 59 | VirtualProtect(OriginalFunctionAddress, (nuint)HookInstructions.Length, 0x40 /*PAGE_EXECUTE_READWRITE*/, out uint oldProt); 60 | 61 | *(IntPtr*)((IntPtr)hkIstrPtr + 2) = (IntPtr)hookedMessageBoxA; 62 | 63 | CopyMemory((byte*)hkIstrPtr, (byte*)OriginalFunctionAddress, HookInstructions.Length); 64 | } 65 | 66 | Console.WriteLine($"Hooked MessageBoxA at {OriginalFunctionAddress:X}."); 67 | } 68 | 69 | [UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })] 70 | private unsafe static int HMessageBoxA(nint* handle, char* lpText, char* lpCaption, nuint uType) 71 | { 72 | Console.WriteLine($"MessageBoxA called -> handle: {(handle != null ? $"{*handle:X}" : "0")}, {Marshal.PtrToStringAnsi((nint)lpText)}, {Marshal.PtrToStringAnsi((nint)lpCaption)}, {uType:x}"); 73 | 74 | //Modify arguments 75 | string newlpText = "LOL"; 76 | fixed (byte* nStrPtr = Encoding.ASCII.GetBytes(newlpText)) 77 | lpText = (char*)nStrPtr; 78 | 79 | string newlpCaption = "This is hooked"; 80 | fixed (byte* nStrPtr = Encoding.ASCII.GetBytes(newlpCaption)) 81 | lpCaption = (char*)nStrPtr; 82 | 83 | //Unhook 84 | fixed (void* origIstrPtr = OriginalFunctionInstructions) 85 | CopyMemory((byte*)origIstrPtr, (byte*)OriginalFunctionAddress, OriginalFunctionInstructions.Length); 86 | 87 | //Get original function 88 | delegate* unmanaged[Cdecl] originalMessageBoxA = (delegate* unmanaged[Cdecl])OriginalFunctionAddress; 89 | 90 | //Hook the function back 91 | /*int retVal = originalMessageBoxA(handle, lpText, lpCaption, uType); 92 | 93 | //Modif return value 94 | retVal = 69; 95 | 96 | fixed (void* hkInstrPtr = HookInstructions) 97 | CopyMemory((byte*)hkInstrPtr, (byte*)OriginalFunctionAddress, HookInstructions.Length); 98 | 99 | return retVal;*/ 100 | 101 | //Call original function 102 | return originalMessageBoxA(handle, lpText, lpCaption, uType); 103 | } 104 | 105 | //memcpy 106 | private unsafe static void CopyMemory(byte* source, byte* destination, int copyLength) 107 | { 108 | byte* pDest = destination; 109 | byte* pSrc = source; 110 | 111 | for (int i = 0; i < copyLength; i++) 112 | *(pDest + i) = *(pSrc + i); 113 | } 114 | } 115 | } 116 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | # SharpNativeDLL 3 | NativeAOT assisted native .NET DLL injection 4 | 5 | This is an example project to inject a NAOT compiled native .NET DLL. 6 | It implements a custom UnmanagedCallersOnly DllMain entrypoint which handles DLL_PROCESS_ATTACH protocol, and can be modified to further accept other protocols. 7 | 8 | REQUIREMENTS: .NET 7 9 | 10 | # Limitations 11 | The limitations for this particular implementation is outlined in the [official documentation for NativeAOT](https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot/#limitations-of-native-aot-deployment) 12 | 13 | The most notable limitation is that it is bound to x64 and ARM64 architectures. 14 | 15 | 16 | # Screenshot 17 | ![](https://github.com/ZeroLP/SharpNativeDLL/blob/main/Example.png) 18 | -------------------------------------------------------------------------------- /SharpNativeDLL/SharpNativeDLL.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 17 4 | VisualStudioVersion = 17.4.33020.496 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharpNativeDLL", "SharpNativeDLL\SharpNativeDLL.csproj", "{470A763A-60F8-4D96-B6AB-5D90A4092016}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {470A763A-60F8-4D96-B6AB-5D90A4092016}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {470A763A-60F8-4D96-B6AB-5D90A4092016}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {470A763A-60F8-4D96-B6AB-5D90A4092016}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {470A763A-60F8-4D96-B6AB-5D90A4092016}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {E3256B7D-5CB2-4EB7-8CA7-C99552150902} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /SharpNativeDLL/SharpNativeDLL/EntryPoint.cs: -------------------------------------------------------------------------------- 1 | using System.Runtime.CompilerServices; 2 | using System.Runtime.InteropServices; 3 | 4 | namespace SharpNativeDLL 5 | { 6 | public class EntryPoint 7 | { 8 | private const uint DLL_PROCESS_DETACH = 0, 9 | DLL_PROCESS_ATTACH = 1, 10 | DLL_THREAD_ATTACH = 2, 11 | DLL_THREAD_DETACH = 3; 12 | 13 | [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] 14 | public static extern int MessageBox(IntPtr hWnd, string text, string caption, uint type); 15 | 16 | [UnmanagedCallersOnly(EntryPoint = "DllMain", CallConvs = new[] { typeof(CallConvStdcall) })] 17 | public static bool DllMain(IntPtr hModule, uint ul_reason_for_call, IntPtr lpReserved) 18 | { 19 | switch (ul_reason_for_call) 20 | { 21 | case DLL_PROCESS_ATTACH: 22 | MessageBox(0, "DLL_PROCESS_ATTACH", "Your kind @", 0); 23 | break; 24 | default: 25 | break; 26 | } 27 | return true; 28 | } 29 | } 30 | } -------------------------------------------------------------------------------- /SharpNativeDLL/SharpNativeDLL/SharpNativeDLL.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | net7.0 5 | enable 6 | enable 7 | true 8 | 9 | 10 | 11 | AnyCPU 12 | 13 | none 14 | false 15 | 16 | true 17 | 18 | 19 | --------------------------------------------------------------------------------