├── .github └── FUNDING.yml ├── .gitignore ├── CawkVMUnpacker.sln ├── CawkVMUnpacker ├── CLI │ ├── CLIUtils.cs │ ├── CommandLineArguments.cs │ ├── CommandLineParser.cs │ ├── ConsoleLogger.cs │ └── Program.cs ├── CawkVMUnpacker.csproj ├── DnlibUtils.cs ├── ILogger.cs ├── Unpacking │ ├── CawkVMEncryption.cs │ ├── CawkVMMethodDataReader.cs │ ├── CawkVMToCilBodyConverter.cs │ ├── DnlibLogger.cs │ ├── IUnpackerParameters.cs │ ├── MemberLocator.cs │ ├── RawMethodData.cs │ ├── Unpacker.cs │ ├── VMExceptionHandler.cs │ └── VMInstruction.cs └── string2.cs ├── LICENSE └── README.md /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | github: ElektroKill 2 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.rsuser 8 | *.suo 9 | *.user 10 | *.userosscache 11 | *.sln.docstates 12 | 13 | # User-specific files (MonoDevelop/Xamarin Studio) 14 | *.userprefs 15 | 16 | # Mono auto generated files 17 | mono_crash.* 18 | 19 | # Build results 20 | [Dd]ebug/ 21 | [Dd]ebugPublic/ 22 | [Rr]elease/ 23 | [Rr]eleases/ 24 | x64/ 25 | x86/ 26 | [Aa][Rr][Mm]/ 27 | [Aa][Rr][Mm]64/ 28 | bld/ 29 | [Bb]in/ 30 | [Oo]bj/ 31 | [Ll]og/ 32 | [Ll]ogs/ 33 | 34 | # Visual Studio 2015/2017 cache/options directory 35 | .vs/ 36 | # Uncomment if you have tasks that create the project's static files in wwwroot 37 | #wwwroot/ 38 | 39 | # Visual Studio 2017 auto generated files 40 | Generated\ Files/ 41 | 42 | # MSTest test Results 43 | [Tt]est[Rr]esult*/ 44 | [Bb]uild[Ll]og.* 45 | 46 | # NUnit 47 | *.VisualState.xml 48 | TestResult.xml 49 | nunit-*.xml 50 | 51 | # Build Results of an ATL Project 52 | [Dd]ebugPS/ 53 | [Rr]eleasePS/ 54 | dlldata.c 55 | 56 | # Benchmark Results 57 | BenchmarkDotNet.Artifacts/ 58 | 59 | # .NET Core 60 | project.lock.json 61 | project.fragment.lock.json 62 | artifacts/ 63 | 64 | # StyleCop 65 | StyleCopReport.xml 66 | 67 | # Files built by Visual Studio 68 | *_i.c 69 | *_p.c 70 | *_h.h 71 | *.ilk 72 | *.meta 73 | *.obj 74 | *.iobj 75 | *.pch 76 | *.pdb 77 | *.ipdb 78 | *.pgc 79 | *.pgd 80 | *.rsp 81 | *.sbr 82 | *.tlb 83 | *.tli 84 | *.tlh 85 | *.tmp 86 | *.tmp_proj 87 | *_wpftmp.csproj 88 | *.log 89 | *.vspscc 90 | *.vssscc 91 | .builds 92 | *.pidb 93 | *.svclog 94 | *.scc 95 | 96 | # Chutzpah Test files 97 | _Chutzpah* 98 | 99 | # Visual C++ cache files 100 | ipch/ 101 | *.aps 102 | *.ncb 103 | *.opendb 104 | *.opensdf 105 | *.sdf 106 | *.cachefile 107 | *.VC.db 108 | *.VC.VC.opendb 109 | 110 | # Visual Studio profiler 111 | *.psess 112 | *.vsp 113 | *.vspx 114 | *.sap 115 | 116 | # Visual Studio Trace Files 117 | *.e2e 118 | 119 | # TFS 2012 Local Workspace 120 | $tf/ 121 | 122 | # Guidance Automation Toolkit 123 | *.gpState 124 | 125 | # ReSharper is a .NET coding add-in 126 | _ReSharper*/ 127 | *.[Rr]e[Ss]harper 128 | *.DotSettings.user 129 | 130 | # TeamCity is a build add-in 131 | _TeamCity* 132 | 133 | # DotCover is a Code Coverage Tool 134 | *.dotCover 135 | 136 | # AxoCover is a Code Coverage Tool 137 | .axoCover/* 138 | !.axoCover/settings.json 139 | 140 | # Visual Studio code coverage results 141 | *.coverage 142 | *.coveragexml 143 | 144 | # NCrunch 145 | _NCrunch_* 146 | .*crunch*.local.xml 147 | nCrunchTemp_* 148 | 149 | # MightyMoose 150 | *.mm.* 151 | AutoTest.Net/ 152 | 153 | # Web workbench (sass) 154 | .sass-cache/ 155 | 156 | # Installshield output folder 157 | [Ee]xpress/ 158 | 159 | # DocProject is a documentation generator add-in 160 | DocProject/buildhelp/ 161 | DocProject/Help/*.HxT 162 | DocProject/Help/*.HxC 163 | DocProject/Help/*.hhc 164 | DocProject/Help/*.hhk 165 | DocProject/Help/*.hhp 166 | DocProject/Help/Html2 167 | DocProject/Help/html 168 | 169 | # Click-Once directory 170 | publish/ 171 | 172 | # Publish Web Output 173 | *.[Pp]ublish.xml 174 | *.azurePubxml 175 | # Note: Comment the next line if you want to checkin your web deploy settings, 176 | # but database connection strings (with potential passwords) will be unencrypted 177 | *.pubxml 178 | *.publishproj 179 | 180 | # Microsoft Azure Web App publish settings. Comment the next line if you want to 181 | # checkin your Azure Web App publish settings, but sensitive information contained 182 | # in these scripts will be unencrypted 183 | PublishScripts/ 184 | 185 | # NuGet Packages 186 | *.nupkg 187 | # NuGet Symbol Packages 188 | *.snupkg 189 | # The packages folder can be ignored because of Package Restore 190 | **/[Pp]ackages/* 191 | # except build/, which is used as an MSBuild target. 192 | !**/[Pp]ackages/build/ 193 | # Uncomment if necessary however generally it will be regenerated when needed 194 | #!**/[Pp]ackages/repositories.config 195 | # NuGet v3's project.json files produces more ignorable files 196 | *.nuget.props 197 | *.nuget.targets 198 | 199 | # Microsoft Azure Build Output 200 | csx/ 201 | *.build.csdef 202 | 203 | # Microsoft Azure Emulator 204 | ecf/ 205 | rcf/ 206 | 207 | # Windows Store app package directories and files 208 | AppPackages/ 209 | BundleArtifacts/ 210 | Package.StoreAssociation.xml 211 | _pkginfo.txt 212 | *.appx 213 | *.appxbundle 214 | *.appxupload 215 | 216 | # Visual Studio cache files 217 | # files ending in .cache can be ignored 218 | *.[Cc]ache 219 | # but keep track of directories ending in .cache 220 | !?*.[Cc]ache/ 221 | 222 | # Others 223 | ClientBin/ 224 | ~$* 225 | *~ 226 | *.dbmdl 227 | *.dbproj.schemaview 228 | *.jfm 229 | *.pfx 230 | *.publishsettings 231 | orleans.codegen.cs 232 | 233 | # Including strong name files can present a security risk 234 | # (https://github.com/github/gitignore/pull/2483#issue-259490424) 235 | #*.snk 236 | 237 | # Since there are multiple workflows, uncomment next line to ignore bower_components 238 | # (https://github.com/github/gitignore/pull/1529#issuecomment-104372622) 239 | #bower_components/ 240 | 241 | # RIA/Silverlight projects 242 | Generated_Code/ 243 | 244 | # Backup & report files from converting an old project file 245 | # to a newer Visual Studio version. Backup files are not needed, 246 | # because we have git ;-) 247 | _UpgradeReport_Files/ 248 | Backup*/ 249 | UpgradeLog*.XML 250 | UpgradeLog*.htm 251 | ServiceFabricBackup/ 252 | *.rptproj.bak 253 | 254 | # SQL Server files 255 | *.mdf 256 | *.ldf 257 | *.ndf 258 | 259 | # Business Intelligence projects 260 | *.rdl.data 261 | *.bim.layout 262 | *.bim_*.settings 263 | *.rptproj.rsuser 264 | *- [Bb]ackup.rdl 265 | *- [Bb]ackup ([0-9]).rdl 266 | *- [Bb]ackup ([0-9][0-9]).rdl 267 | 268 | # Microsoft Fakes 269 | FakesAssemblies/ 270 | 271 | # GhostDoc plugin setting file 272 | *.GhostDoc.xml 273 | 274 | # Node.js Tools for Visual Studio 275 | .ntvs_analysis.dat 276 | node_modules/ 277 | 278 | # Visual Studio 6 build log 279 | *.plg 280 | 281 | # Visual Studio 6 workspace options file 282 | *.opt 283 | 284 | # Visual Studio 6 auto-generated workspace file (contains which files were open etc.) 285 | *.vbw 286 | 287 | # Visual Studio LightSwitch build output 288 | **/*.HTMLClient/GeneratedArtifacts 289 | **/*.DesktopClient/GeneratedArtifacts 290 | **/*.DesktopClient/ModelManifest.xml 291 | **/*.Server/GeneratedArtifacts 292 | **/*.Server/ModelManifest.xml 293 | _Pvt_Extensions 294 | 295 | # Paket dependency manager 296 | .paket/paket.exe 297 | paket-files/ 298 | 299 | # FAKE - F# Make 300 | .fake/ 301 | 302 | # CodeRush personal settings 303 | .cr/personal 304 | 305 | # Python Tools for Visual Studio (PTVS) 306 | __pycache__/ 307 | *.pyc 308 | 309 | # Cake - Uncomment if you are using it 310 | # tools/** 311 | # !tools/packages.config 312 | 313 | # Tabs Studio 314 | *.tss 315 | 316 | # Telerik's JustMock configuration file 317 | *.jmconfig 318 | 319 | # BizTalk build output 320 | *.btp.cs 321 | *.btm.cs 322 | *.odx.cs 323 | *.xsd.cs 324 | 325 | # OpenCover UI analysis results 326 | OpenCover/ 327 | 328 | # Azure Stream Analytics local run output 329 | ASALocalRun/ 330 | 331 | # MSBuild Binary and Structured Log 332 | *.binlog 333 | 334 | # NVidia Nsight GPU debugger configuration file 335 | *.nvuser 336 | 337 | # MFractors (Xamarin productivity tool) working folder 338 | .mfractor/ 339 | 340 | # Local History for Visual Studio 341 | .localhistory/ 342 | 343 | # BeatPulse healthcheck temp database 344 | healthchecksdb 345 | 346 | # Backup folder for Package Reference Convert tool in Visual Studio 2017 347 | MigrationBackup/ 348 | 349 | # Ionide (cross platform F# VS Code tools) working folder 350 | .ionide/ 351 | -------------------------------------------------------------------------------- /CawkVMUnpacker.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CawkVMUnpacker", "CawkVMUnpacker\CawkVMUnpacker.csproj", "{E5792180-21D4-4E0C-9BF7-B6CA4149364A}" 4 | EndProject 5 | Global 6 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 7 | Debug|Any CPU = Debug|Any CPU 8 | Release|Any CPU = Release|Any CPU 9 | EndGlobalSection 10 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 11 | {E5792180-21D4-4E0C-9BF7-B6CA4149364A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 12 | {E5792180-21D4-4E0C-9BF7-B6CA4149364A}.Debug|Any CPU.Build.0 = Debug|Any CPU 13 | {E5792180-21D4-4E0C-9BF7-B6CA4149364A}.Release|Any CPU.ActiveCfg = Release|Any CPU 14 | {E5792180-21D4-4E0C-9BF7-B6CA4149364A}.Release|Any CPU.Build.0 = Release|Any CPU 15 | EndGlobalSection 16 | EndGlobal 17 | -------------------------------------------------------------------------------- /CawkVMUnpacker/CLI/CLIUtils.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace CawkVMUnpacker.CLI { 4 | internal static class CLIUtils { 5 | private static readonly bool NoColorEnabled = Environment.GetEnvironmentVariable("NO_COLOR") != null; 6 | 7 | internal static void WriteInColor(string text, ConsoleColor newColor) { 8 | if (NoColorEnabled || Console.ForegroundColor == newColor) 9 | Console.Write(text); 10 | else { 11 | Console.ForegroundColor = newColor; 12 | Console.Write(text); 13 | } 14 | } 15 | 16 | internal static void WriteLineInColor(string text, ConsoleColor newColor) { 17 | if (NoColorEnabled || Console.ForegroundColor == newColor) 18 | Console.WriteLine(text); 19 | else { 20 | Console.ForegroundColor = newColor; 21 | Console.WriteLine(text); 22 | } 23 | } 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /CawkVMUnpacker/CLI/CommandLineArguments.cs: -------------------------------------------------------------------------------- 1 | using CawkVMUnpacker.Unpacking; 2 | 3 | namespace CawkVMUnpacker.CLI { 4 | internal sealed class CommandLineArguments : IUnpackerParameters { 5 | internal bool ShowHelp { get; set; } 6 | public string? FilePath { get; set; } 7 | public bool PreserveMetadata { get; set; } 8 | public bool KeepExtraPEData { get; set; } 9 | public string? DataResourceName { get; set; } 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /CawkVMUnpacker/CLI/CommandLineParser.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.IO; 3 | 4 | namespace CawkVMUnpacker.CLI { 5 | internal sealed class CommandLineParser { 6 | private ParseError errorValue; 7 | private string errorArg = string.Empty; 8 | 9 | internal bool Parse(string[] args, out CommandLineArguments parsedArgs) { 10 | parsedArgs = new CommandLineArguments(); 11 | 12 | if (args.Length < 1) { 13 | errorValue = ParseError.BadArgCount; 14 | return false; 15 | } 16 | 17 | if (args[0] == "-h" || args[0] == "--help") { 18 | parsedArgs.ShowHelp = true; 19 | return true; 20 | } 21 | 22 | // Check for invalid characters in path. 23 | try { 24 | parsedArgs.FilePath = Path.GetFullPath(args[0]); 25 | } 26 | catch { 27 | errorValue = ParseError.InvalidFilePath; 28 | return false; 29 | } 30 | 31 | if (!File.Exists(parsedArgs.FilePath)) { 32 | errorValue = ParseError.InvalidFilePath; 33 | return false; 34 | } 35 | 36 | for (int i = 1; i < args.Length; i++) { 37 | switch (args[i]) { 38 | case "--preserveMD": 39 | case "-p": 40 | parsedArgs.PreserveMetadata = true; 41 | break; 42 | case "--keepPE": 43 | case "-k": 44 | parsedArgs.KeepExtraPEData = true; 45 | break; 46 | case "--dataName": 47 | case "-d": 48 | parsedArgs.DataResourceName = args[++i]; 49 | break; 50 | default: 51 | errorValue = ParseError.InavlidArgument; 52 | errorArg = args[i]; 53 | return false; 54 | } 55 | } 56 | 57 | return true; 58 | } 59 | 60 | internal string GetError() { 61 | switch (errorValue) { 62 | case ParseError.BadArgCount: 63 | return "Too little arguments."; 64 | case ParseError.InavlidArgument: 65 | return $"Inavlid argument '{errorArg}'"; 66 | case ParseError.InavlidArgValue: 67 | return $"Inavlid argument value '{errorArg}'"; 68 | case ParseError.InvalidFilePath: 69 | return "Provided file does not exist!"; 70 | default: 71 | throw new ArgumentOutOfRangeException(); 72 | } 73 | } 74 | 75 | private enum ParseError { 76 | BadArgCount, 77 | InvalidFilePath, 78 | InavlidArgument, 79 | InavlidArgValue 80 | } 81 | } 82 | } 83 | -------------------------------------------------------------------------------- /CawkVMUnpacker/CLI/ConsoleLogger.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace CawkVMUnpacker.CLI { 4 | internal sealed class ConsoleLogger : ILogger { 5 | public void Info(string str) { 6 | CLIUtils.WriteInColor("[", ConsoleColor.Gray); 7 | CLIUtils.WriteInColor("INFO", ConsoleColor.White); 8 | CLIUtils.WriteLineInColor($"] {str}", ConsoleColor.Gray); 9 | } 10 | 11 | public void Debug(string str) { 12 | CLIUtils.WriteLineInColor($"[DEBUG] {str}", ConsoleColor.Gray); 13 | } 14 | 15 | public void Warn(string str) { 16 | CLIUtils.WriteInColor("[", ConsoleColor.Gray); 17 | CLIUtils.WriteInColor("WARN", ConsoleColor.Yellow); 18 | CLIUtils.WriteLineInColor($"] {str}", ConsoleColor.Gray); 19 | } 20 | 21 | public void Error(string str) { 22 | CLIUtils.WriteInColor("[", ConsoleColor.Gray); 23 | CLIUtils.WriteInColor("ERROR", ConsoleColor.Red); 24 | CLIUtils.WriteLineInColor($"] {str}", ConsoleColor.Gray); 25 | } 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /CawkVMUnpacker/CLI/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Reflection; 3 | using CawkVMUnpacker.Unpacking; 4 | 5 | namespace CawkVMUnpacker.CLI { 6 | internal sealed class Program { 7 | private static int Main(string[] args) { 8 | int retValue = 1; 9 | 10 | var assembly = typeof(Program).Assembly; 11 | var productAttr = (AssemblyProductAttribute)assembly.GetCustomAttributes(typeof(AssemblyProductAttribute), false)[0]; 12 | var verAttr = (AssemblyInformationalVersionAttribute)assembly.GetCustomAttributes(typeof(AssemblyInformationalVersionAttribute), false)[0]; 13 | string fullProductName = $"{productAttr.Product} {verAttr.InformationalVersion}"; 14 | 15 | CLIUtils.WriteLineInColor(fullProductName, ConsoleColor.White); 16 | CLIUtils.WriteLineInColor("~ Now with 100% less reflection ~", ConsoleColor.White); 17 | Console.WriteLine(); 18 | 19 | string origTitle = Console.Title; 20 | Console.Title = $"{fullProductName} - Running..."; 21 | 22 | var parser = new CommandLineParser(); 23 | if (parser.Parse(args, out var parsedArgs)) { 24 | if (parsedArgs.ShowHelp) { 25 | Console.Title = $"{fullProductName} - Help"; 26 | CLIUtils.WriteLineInColor($"Usage: {AppDomain.CurrentDomain.FriendlyName} {{FilePath}} {{Options}}{Environment.NewLine}", ConsoleColor.Gray); 27 | CLIUtils.WriteLineInColor("Options:", ConsoleColor.Gray); 28 | CLIUtils.WriteLineInColor(" --help|-h Showns this screen.", ConsoleColor.Gray); 29 | CLIUtils.WriteLineInColor(" --preserveMD|-p Preserves all metadata when writing.", ConsoleColor.Gray); 30 | CLIUtils.WriteLineInColor(" --keepPE|-k Preserves all Win32 resources and extra PE data when writing.", ConsoleColor.Gray); 31 | CLIUtils.WriteLineInColor(" --dataName|-d Specify CawkVM data resource name.", ConsoleColor.Gray); 32 | retValue = 0; 33 | } 34 | else { 35 | var unp = new Unpacker(new ConsoleLogger(), parsedArgs); 36 | bool success = unp.Run(); 37 | 38 | if (success) { 39 | Console.Title = $"{fullProductName} - Success"; 40 | retValue = 0; 41 | } 42 | else 43 | Console.Title = $"{fullProductName} - Fail"; 44 | } 45 | } 46 | else { 47 | Console.Title = $"{fullProductName} - Error"; 48 | CLIUtils.WriteLineInColor($"Argument Error: {parser.GetError()}", ConsoleColor.Red); 49 | CLIUtils.WriteLineInColor("Use -h or --help.", ConsoleColor.Yellow); 50 | } 51 | 52 | Console.ResetColor(); 53 | Console.ReadKey(true); 54 | Console.Title = origTitle; 55 | return retValue; 56 | } 57 | } 58 | } 59 | -------------------------------------------------------------------------------- /CawkVMUnpacker/CawkVMUnpacker.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net48 6 | enable 7 | 8 | latest 9 | 10 | ..\$(Configuration)\bin\ 11 | false 12 | 13 | CawkVM Unpacker 14 | ElektroKill 15 | Copyright (C) ElektroKill 2021 16 | 1.0.0.0 17 | v1.0.0 18 | 19 | 20 | 21 | 22 | 23 | all 24 | runtime; build; native; contentfiles; analyzers; buildtransitive 25 | 26 | 27 | all 28 | runtime; build; native; contentfiles; analyzers; buildtransitive 29 | 30 | 31 | 32 | 33 | -------------------------------------------------------------------------------- /CawkVMUnpacker/DnlibUtils.cs: -------------------------------------------------------------------------------- 1 | using dnlib.DotNet; 2 | using dnlib.DotNet.Emit; 3 | 4 | namespace CawkVMUnpacker { 5 | internal static class DnlibUtils { 6 | internal static int? FindFirstCodeIndex(this CilBody? body, Code code) { 7 | if (body is null) 8 | return null; 9 | var instrs = body.Instructions; 10 | for (int i = 0; i < instrs.Count; i++) { 11 | if (instrs[i].OpCode.Code == code) 12 | return i; 13 | } 14 | 15 | return null; 16 | } 17 | 18 | // TODO: replace this with proper stack analysis. 19 | internal static int? FindFirstNonNopPrecedingCode(this CilBody? body, int index) { 20 | if (body is null) 21 | return null; 22 | var instrs = body.Instructions; 23 | for (int i = index - 1; i >= 0; i--) { 24 | if (instrs[i].OpCode.Code != Code.Nop) 25 | return i; 26 | } 27 | 28 | return null; 29 | } 30 | 31 | internal static bool IsMethod(IMethod? method, string returnType, string parameters) => 32 | method != null && method.FullName == returnType + " " + method.DeclaringType.FullName + "::" + method.Name + parameters; 33 | 34 | internal static byte[] GetOriginalRawILBytes(this MethodDef methodDef, ModuleDefMD module) { 35 | var reader = module.Metadata.PEImage.CreateReader(methodDef.RVA); 36 | 37 | byte b = reader.ReadByte(); 38 | 39 | // parse header info and determine code size 40 | uint codeSize = 0; 41 | switch (b & 7) { 42 | case 2: 43 | case 6: 44 | codeSize = (uint)(b >> 2); 45 | break; 46 | case 3: 47 | ushort header = (ushort)(reader.ReadByte() << 8 | b); 48 | int headerSize = (header >> 12) * sizeof(uint); 49 | reader.ReadUInt16(); 50 | codeSize = reader.ReadUInt32(); 51 | reader.Position = (uint)headerSize; 52 | break; 53 | } 54 | 55 | // read actual body 56 | byte[] ilBytes = new byte[codeSize]; 57 | reader.ReadBytes(ilBytes, 0, ilBytes.Length); 58 | return ilBytes; 59 | } 60 | } 61 | } 62 | -------------------------------------------------------------------------------- /CawkVMUnpacker/ILogger.cs: -------------------------------------------------------------------------------- 1 | namespace CawkVMUnpacker { 2 | internal interface ILogger { 3 | void Info(string str); 4 | void Debug(string str); 5 | void Warn(string str); 6 | void Error(string str); 7 | } 8 | } 9 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/CawkVMEncryption.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.IO; 3 | using System.Security.Cryptography; 4 | 5 | namespace CawkVMUnpacker.Unpacking { 6 | internal static class CawkVMEncryption { 7 | internal static byte[] SeededRandomKeyXOR(byte[] input) { 8 | var rand = new Random(23546654); 9 | byte[] result = new byte[input.Length]; 10 | for (int i = 0; i < input.Length; i++) { 11 | result[i] = (byte)(input[i] ^ rand.Next(0, 250)); 12 | } 13 | 14 | return result; 15 | } 16 | 17 | /// 18 | /// Performs the decryption that would usually happen in the native runtime component. 19 | /// 20 | internal static byte[] DecryptNative(byte[] data, byte[] key) { 21 | int N1 = 12; 22 | int N2 = 14; 23 | int NS = 258; 24 | 25 | for (int i = 0; i < key.Length; i++) 26 | NS += NS % (key[i] + 1); 27 | 28 | byte[] result = new byte[data.Length]; 29 | 30 | for (int i = 0; i < data.Length; i++) { 31 | NS = key[i % key.Length] + NS; 32 | N1 = (NS + 5) * (N1 & 0xFF) + (N1 >> 8); 33 | N2 = (NS + 7) * (N2 & 0xFF) + (N2 >> 8); 34 | NS = (N1 << 8) + N2 & 0xFF; 35 | 36 | result[i] = (byte)(data[i] ^ NS); 37 | } 38 | 39 | const string hcpKey = "HCP"; 40 | for (int i = 0; i < result.Length; i++) 41 | result[i] = (byte)(result[i] ^ hcpKey[i % hcpKey.Length]); 42 | 43 | return result; 44 | } 45 | 46 | internal static byte[] DecryptRijndael(byte[] data, byte[] key) { 47 | byte[] result; 48 | using (var rijndael = new RijndaelManaged()) { 49 | rijndael.Key = rijndael.IV = key; 50 | using (var stream = new MemoryStream()) 51 | using (var decrypt = new CryptoStream(stream, rijndael.CreateDecryptor(), CryptoStreamMode.Write)) { 52 | decrypt.Write(data, 0, data.Length); 53 | decrypt.FlushFinalBlock(); 54 | result = stream.ToArray(); 55 | } 56 | } 57 | 58 | return result; 59 | } 60 | } 61 | } 62 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/CawkVMMethodDataReader.cs: -------------------------------------------------------------------------------- 1 | using System.Collections.Generic; 2 | using dnlib.DotNet.Emit; 3 | using dnlib.IO; 4 | 5 | namespace CawkVMUnpacker.Unpacking { 6 | internal static class CawkVMMethodDataReader { 7 | internal static (IList Instructions, IList ExceptionHandlers) ReadVMMethodData(byte[] data) { 8 | var reader = ByteArrayDataReaderFactory.CreateReader(data); 9 | 10 | var exHandlers = ReadExceptionHandlers(ref reader); 11 | var instrs = ReadInstructions(ref reader); 12 | 13 | return (instrs, exHandlers); 14 | } 15 | 16 | private static IList ReadExceptionHandlers(ref DataReader reader) { 17 | List response = new List(); 18 | int exCount = reader.ReadInt32(); 19 | for (int i = 0; i < exCount; i++) { 20 | VMExceptionHandler handler = new VMExceptionHandler { 21 | CatchTypeMDToken = reader.ReadInt32(), 22 | FilterStart = reader.ReadInt32(), 23 | HandlerEnd = reader.ReadInt32(), 24 | HandlerStart = reader.ReadInt32(), 25 | HandlerType = reader.ReadByte(), 26 | TryEnd = reader.ReadInt32(), 27 | TryStart = reader.ReadInt32() 28 | }; 29 | response.Add(handler); 30 | } 31 | 32 | return response; 33 | } 34 | 35 | private static IList ReadInstructions(ref DataReader reader) { 36 | List response = new List(); 37 | int instrCount = reader.ReadInt32(); 38 | for (int i = 0; i < instrCount; i++) { 39 | VMInstruction instr = new VMInstruction { 40 | OpCode = (Code)reader.ReadInt16() 41 | }; 42 | switch (reader.ReadByte()) { 43 | case 0: 44 | instr.OperandType = OperandType.InlineNone; 45 | instr.Operand = null; 46 | break; 47 | case 1: 48 | instr.OperandType = OperandType.InlineMethod; 49 | instr.Operand = reader.ReadInt32(); 50 | break; 51 | case 2: 52 | instr.OperandType = OperandType.InlineString; 53 | instr.Operand = reader.ReadSerializedString(); 54 | break; 55 | case 3: 56 | instr.OperandType = OperandType.InlineI; 57 | instr.Operand = reader.ReadInt32(); 58 | break; 59 | case 4: 60 | instr.OperandType = OperandType.ShortInlineVar; 61 | instr.Operand = (reader.ReadInt32(), reader.ReadBoolean()); 62 | break; 63 | case 5: 64 | instr.OperandType = OperandType.InlineField; 65 | instr.Operand = reader.ReadInt32(); 66 | break; 67 | case 6: 68 | instr.OperandType = OperandType.InlineType; 69 | instr.Operand = reader.ReadInt32(); 70 | break; 71 | case 7: 72 | instr.OperandType = OperandType.ShortInlineBrTarget; 73 | instr.Operand = reader.ReadInt32(); 74 | break; 75 | case 8: 76 | instr.OperandType = OperandType.ShortInlineI; 77 | instr.Operand = reader.ReadByte(); 78 | break; 79 | case 9: { 80 | instr.OperandType = OperandType.InlineSwitch; 81 | int count = reader.ReadInt32(); 82 | int[] indexes = new int[count]; 83 | for (int j = 0; j < count; j++) { 84 | indexes[j] = reader.ReadInt32(); 85 | } 86 | 87 | instr.Operand = indexes; 88 | break; 89 | } 90 | case 10: 91 | instr.OperandType = OperandType.InlineBrTarget; 92 | instr.Operand = reader.ReadInt32(); 93 | break; 94 | case 11: 95 | instr.OperandType = OperandType.InlineTok; 96 | instr.Operand = reader.ReadInt32(); 97 | reader.Position += 1; 98 | break; 99 | case 12: 100 | instr.OperandType = OperandType.InlineVar; 101 | instr.Operand = (reader.ReadInt32(), reader.ReadBoolean()); 102 | break; 103 | case 13: 104 | instr.OperandType = OperandType.ShortInlineR; 105 | instr.Operand = reader.ReadSingle(); 106 | break; 107 | case 14: 108 | instr.OperandType = OperandType.InlineR; 109 | instr.Operand = reader.ReadDouble(); 110 | break; 111 | case 15: 112 | instr.OperandType = OperandType.InlineI8; 113 | instr.Operand = reader.ReadInt64(); 114 | break; 115 | } 116 | 117 | response.Add(instr); 118 | } 119 | 120 | return response; 121 | } 122 | } 123 | } 124 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/CawkVMToCilBodyConverter.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using dnlib.DotNet; 4 | using dnlib.DotNet.Emit; 5 | 6 | namespace CawkVMUnpacker.Unpacking { 7 | internal sealed class CawkVMToCilBodyConverter { 8 | private readonly ModuleDefMD _module; 9 | 10 | internal CawkVMToCilBodyConverter(ModuleDefMD module) { 11 | _module = module; 12 | } 13 | 14 | internal CilBody Convert(MethodDef method, IList instrs, IList exceptionHandlers) { 15 | var gpContext = GenericParamContext.Create(method); 16 | 17 | var newInstrs = ConvertInstructions(method, instrs, gpContext); 18 | FixBranchTargets(newInstrs); 19 | 20 | var newExHandlers = ConvertExceptionHandlers(exceptionHandlers, newInstrs, gpContext); 21 | 22 | return new CilBody(method.Body.InitLocals, newInstrs, newExHandlers, method.Body.Variables) { 23 | LocalVarSigTok = method.Body.LocalVarSigTok, 24 | PdbMethod = method.Body.PdbMethod 25 | }; 26 | } 27 | 28 | private IList ConvertInstructions(MethodDef method, IList instrs, GenericParamContext gpContext) { 29 | List newInstrs = new List(); 30 | foreach (VMInstruction parsedInstr in instrs) { 31 | switch (parsedInstr.OperandType) { 32 | case OperandType.InlineNone: 33 | newInstrs.Add(new Instruction(parsedInstr.OpCode.ToOpCode(), null)); 34 | break; 35 | case OperandType.InlineBrTarget: 36 | case OperandType.InlineSwitch: 37 | case OperandType.ShortInlineBrTarget: 38 | if (parsedInstr.Operand is null) 39 | throw new InvalidOperationException(); 40 | newInstrs.Add(new Instruction(parsedInstr.OpCode.ToOpCode(), parsedInstr.Operand)); 41 | break; 42 | case OperandType.InlineField: 43 | case OperandType.InlineMethod: 44 | case OperandType.InlineTok: 45 | case OperandType.InlineType: 46 | if (parsedInstr.Operand is null) 47 | throw new InvalidOperationException(); 48 | newInstrs.Add( 49 | new Instruction(parsedInstr.OpCode.ToOpCode(), _module.ResolveToken((int)parsedInstr.Operand, gpContext))); 50 | break; 51 | case OperandType.InlineI: 52 | case OperandType.InlineI8: 53 | case OperandType.InlineR: 54 | case OperandType.InlineString: 55 | case OperandType.ShortInlineI: 56 | case OperandType.ShortInlineR: 57 | if (parsedInstr.Operand is null) 58 | throw new InvalidOperationException(); 59 | newInstrs.Add(new Instruction(parsedInstr.OpCode.ToOpCode(), parsedInstr.Operand)); 60 | break; 61 | case OperandType.InlineVar: 62 | case OperandType.ShortInlineVar: 63 | if (parsedInstr.Operand is null) 64 | throw new InvalidOperationException(); 65 | (int index, bool isParamLoad) = ((int, bool))parsedInstr.Operand; 66 | newInstrs.Add(new Instruction(parsedInstr.OpCode.ToOpCode(), 67 | isParamLoad ? method.Parameters[index] : method.Body.Variables[index])); 68 | break; 69 | } 70 | } 71 | 72 | return newInstrs; 73 | } 74 | 75 | private static void FixBranchTargets(IList instrs) { 76 | foreach (var instr in instrs) { 77 | switch (instr.OpCode.OperandType) { 78 | case OperandType.InlineBrTarget: 79 | case OperandType.ShortInlineBrTarget: 80 | instr.Operand = instrs[(int)instr.Operand]; 81 | break; 82 | case OperandType.InlineSwitch: { 83 | int[] oldOperand = (int[])instr.Operand; 84 | var newOperand = new Instruction[oldOperand.Length]; 85 | for (int j = 0; j < oldOperand.Length; j++) 86 | newOperand[j] = instrs[oldOperand[j]]; 87 | instr.Operand = newOperand; 88 | break; 89 | } 90 | } 91 | } 92 | } 93 | 94 | private IList ConvertExceptionHandlers(IList exHandlers, IList instrs, GenericParamContext gpContext) { 95 | var result = new List(); 96 | foreach (var exHandler in exHandlers) { 97 | var exType = exHandler.HandlerType switch { 98 | 1 => ExceptionHandlerType.Catch, 99 | 2 => ExceptionHandlerType.Duplicated, 100 | 3 => ExceptionHandlerType.Fault, 101 | 4 => ExceptionHandlerType.Filter, 102 | 5 => ExceptionHandlerType.Finally, 103 | _ => throw new ArgumentOutOfRangeException() 104 | }; 105 | 106 | var handler = new ExceptionHandler(exType) { 107 | CatchType = exHandler.CatchTypeMDToken != -1 108 | ? _module.ResolveToken(exHandler.CatchTypeMDToken, gpContext) as ITypeDefOrRef 109 | : null, 110 | FilterStart = exHandler.FilterStart != -1 ? instrs[exHandler.FilterStart] : null, 111 | HandlerEnd = exHandler.HandlerEnd != -1 ? instrs[exHandler.HandlerEnd] : null, 112 | HandlerStart = exHandler.HandlerStart != -1 ? instrs[exHandler.HandlerStart] : null, 113 | TryEnd = exHandler.TryEnd != -1 ? instrs[exHandler.TryEnd] : null, 114 | TryStart = exHandler.TryStart != -1 ?instrs[exHandler.TryStart] : null 115 | }; 116 | 117 | result.Add(handler); 118 | } 119 | 120 | return result; 121 | } 122 | } 123 | } 124 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/DnlibLogger.cs: -------------------------------------------------------------------------------- 1 | using System.Collections.Generic; 2 | using dnlib.DotNet; 3 | 4 | namespace CawkVMUnpacker.Unpacking { 5 | internal sealed class DnlibLogger : dnlib.DotNet.ILogger { 6 | private readonly ILogger internalLogger; 7 | private readonly HashSet loggedErrors; 8 | 9 | internal DnlibLogger(ILogger baseLogger) { 10 | internalLogger = baseLogger; 11 | loggedErrors = new HashSet(); 12 | } 13 | 14 | public void Log(object sender, LoggerEvent loggerEvent, string format, params object[] args) { 15 | string actualMessage = string.Format(format, args); 16 | if (loggedErrors.Add(actualMessage)) 17 | internalLogger.Error(actualMessage); 18 | } 19 | 20 | public bool IgnoresEvent(LoggerEvent loggerEvent) { 21 | return loggerEvent != LoggerEvent.Error; 22 | } 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/IUnpackerParameters.cs: -------------------------------------------------------------------------------- 1 | namespace CawkVMUnpacker.Unpacking { 2 | internal interface IUnpackerParameters { 3 | string? FilePath { get; } 4 | bool PreserveMetadata { get; } 5 | bool KeepExtraPEData { get; set; } 6 | 7 | // Unpacker specific parameters 8 | string? DataResourceName { get; } 9 | } 10 | } 11 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/MemberLocator.cs: -------------------------------------------------------------------------------- 1 | using System.Collections.Generic; 2 | using System.Diagnostics.CodeAnalysis; 3 | using dnlib.DotNet; 4 | using dnlib.DotNet.Emit; 5 | 6 | namespace CawkVMUnpacker.Unpacking { 7 | internal sealed class MemberLocator { 8 | private readonly ModuleDef _module; 9 | private readonly string? _proposedResourceName; 10 | 11 | internal EmbeddedResource? DataResource { get; private set; } 12 | internal IMethod? RunnerMethod { get; private set; } 13 | 14 | internal MemberLocator(ModuleDef module, string? proposedResourceName) { 15 | _module = module; 16 | _proposedResourceName = proposedResourceName; 17 | } 18 | 19 | [MemberNotNullWhen(true, "DataResource", "RunnerMethod")] 20 | internal bool LocateRequiredMembers() { 21 | EmbeddedResource? dataResource = null; 22 | 23 | if (!string2.IsNullOrEmpty(_proposedResourceName)) 24 | dataResource = FindResourceInModule(_proposedResourceName); 25 | 26 | if (dataResource is null) { 27 | string? resourceName = FindCawkVMDataResourceName(_module.EntryPoint) ?? 28 | FindCawkVMDataResourceName(_module.GlobalType.FindStaticConstructor()); 29 | 30 | dataResource = FindResourceInModule(resourceName); 31 | } 32 | 33 | if (dataResource is null) 34 | return false; 35 | 36 | var runnerMethod = LocateRunnerMethod(); 37 | if (runnerMethod is null) 38 | return false; 39 | 40 | DataResource = dataResource; 41 | RunnerMethod = runnerMethod; 42 | return true; 43 | } 44 | 45 | private EmbeddedResource? FindResourceInModule(string? resourceName) { 46 | return resourceName is null ? null : _module.Resources.FindEmbeddedResource(resourceName); 47 | } 48 | 49 | private static string? FindCawkVMDataResourceName(MethodDef methodDef) { 50 | if (!methodDef.HasBody) 51 | return null; 52 | 53 | int? index = methodDef.Body.FindFirstCodeIndex(Code.Call); 54 | if (!index.HasValue) 55 | return null; 56 | 57 | int? ldStrIndex = methodDef.Body.FindFirstNonNopPrecedingCode(index.Value); 58 | if (!ldStrIndex.HasValue) 59 | return null; 60 | 61 | var ldstrInstr = methodDef.Body.Instructions[ldStrIndex.Value]; 62 | if (ldstrInstr.OpCode.Code != Code.Ldstr || ldstrInstr.Operand is not string str) 63 | return null; 64 | 65 | return str; 66 | } 67 | 68 | private IMethod? LocateRunnerMethod() { 69 | Dictionary calls = 70 | new Dictionary(MethodEqualityComparer.CompareDeclaringTypes); 71 | 72 | int callCount = 0; 73 | foreach (var type in _module.GetTypes()) { 74 | if (callCount >= 40) 75 | break; 76 | foreach (var method in type.Methods) { 77 | if (method.IsInstanceConstructor || method.IsStaticConstructor || !method.HasBody) 78 | continue; 79 | 80 | foreach (var instruction in method.Body.Instructions) { 81 | if (instruction.OpCode.Code != Code.Call || instruction.Operand is not IMethod calledMethod) 82 | continue; 83 | if (calledMethod.NumberOfGenericParameters != 0) 84 | continue; 85 | if (!DnlibUtils.IsMethod(calledMethod, "System.Object", "(System.Int32,System.Int32,System.Int32,System.Object[])")) 86 | continue; 87 | 88 | calls.TryGetValue(calledMethod, out int calledCount); 89 | calls[calledMethod] = calledCount + 1; 90 | callCount++; 91 | } 92 | } 93 | } 94 | 95 | IMethod? mostCalled = null; 96 | callCount = 0; 97 | foreach (var key in calls.Keys) { 98 | if (calls[key] > callCount) { 99 | callCount = calls[key]; 100 | mostCalled = key; 101 | } 102 | } 103 | 104 | return mostCalled; 105 | } 106 | } 107 | } 108 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/RawMethodData.cs: -------------------------------------------------------------------------------- 1 | namespace CawkVMUnpacker.Unpacking { 2 | internal sealed record RawMethodData(int Offset, int Length); 3 | } 4 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/Unpacker.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.IO; 4 | using System.Security.Cryptography; 5 | using System.Text; 6 | using dnlib.DotNet; 7 | using dnlib.DotNet.Emit; 8 | using dnlib.DotNet.Writer; 9 | using dnlib.IO; 10 | 11 | namespace CawkVMUnpacker.Unpacking { 12 | internal sealed class Unpacker { 13 | private readonly ILogger logger; 14 | private readonly IUnpackerParameters parameters; 15 | 16 | internal Unpacker(ILogger logger, IUnpackerParameters parameters) { 17 | this.logger = logger; 18 | this.parameters = parameters; 19 | } 20 | 21 | internal bool Run() { 22 | try { 23 | var asmResolver = new AssemblyResolver(); 24 | asmResolver.DefaultModuleContext = new ModuleContext(asmResolver); 25 | 26 | logger.Info("Loading module..."); 27 | 28 | var module = ModuleDefMD.Load(parameters.FilePath, asmResolver.DefaultModuleContext); 29 | module.Location = parameters.FilePath; 30 | 31 | logger.Info("Locating required module members..."); 32 | 33 | var locator = new MemberLocator(module, parameters.DataResourceName); 34 | if (!locator.LocateRequiredMembers()) { 35 | logger.Error("Failed to locate required members for unpacking!"); 36 | return false; 37 | } 38 | 39 | logger.Debug($"Found data resource with name '{locator.DataResource.Name}'."); 40 | logger.Debug($"Found runner method reference with token 0x{locator.RunnerMethod.MDToken}."); 41 | 42 | logger.Info("Locating protected methods..."); 43 | var protectedMethods = FindProtectedMethods(module, locator.RunnerMethod); 44 | logger.Debug($"Found {protectedMethods.Count} protected methods!"); 45 | 46 | logger.Info("Decrypting protected method data..."); 47 | var decrypted = DecryptProtectedMethodData(module, locator.DataResource, protectedMethods); 48 | logger.Debug("Succcessfully decrypted method data."); 49 | 50 | logger.Info("Converting protected methods to CIL..."); 51 | var converter = new CawkVMToCilBodyConverter(module); 52 | foreach (var decryptedInfo in decrypted) { 53 | var (instructions, exceptionHandlers) = CawkVMMethodDataReader.ReadVMMethodData(decryptedInfo.Value); 54 | 55 | decryptedInfo.Key.Body = converter.Convert(decryptedInfo.Key, instructions, exceptionHandlers); 56 | } 57 | 58 | logger.Info("Writing module..."); 59 | string newFilePath = Path.ChangeExtension(parameters.FilePath, "unpacked" + Path.GetExtension(parameters.FilePath)); 60 | WriteModule(module, newFilePath); 61 | 62 | logger.Info($"Successfully restored {decrypted.Count} methods!"); 63 | 64 | module.Dispose(); 65 | return true; 66 | } 67 | catch (Exception ex) { 68 | logger.Error($"An error occured during unpacking: {ex}"); 69 | return false; 70 | } 71 | } 72 | 73 | private Dictionary FindProtectedMethods(ModuleDef module, IMethod runnerMethod) { 74 | var result = new Dictionary(); 75 | 76 | foreach (var type in module.GetTypes()) { 77 | foreach (var method in type.Methods) { 78 | if (!method.HasBody) 79 | continue; 80 | 81 | var instrs = method.Body.Instructions; 82 | int callIndex = -1; 83 | for (int i = 0; i < instrs.Count; i++) { 84 | var instr = instrs[i]; 85 | if (instr.OpCode.Code == Code.Call && instr.Operand == runnerMethod) { 86 | callIndex = i; 87 | break; 88 | } 89 | } 90 | 91 | if (callIndex == -1) 92 | continue; 93 | 94 | int? ldlocIndex = method.Body.FindFirstNonNopPrecedingCode(callIndex); 95 | if (!ldlocIndex.HasValue || !instrs[ldlocIndex.Value].IsLdloc()) { 96 | logger.Error($"Failed to find ldloc instruction in method 0x{method.MDToken}."); 97 | continue; 98 | } 99 | 100 | int? idIndex = method.Body.FindFirstNonNopPrecedingCode(ldlocIndex.Value); 101 | if (!idIndex.HasValue || !instrs[idIndex.Value].IsLdcI4()) { 102 | logger.Error($"Failed to find id value in method 0x{method.MDToken}."); 103 | continue; 104 | } 105 | 106 | int? sizeIndex = method.Body.FindFirstNonNopPrecedingCode(idIndex.Value); 107 | if (!sizeIndex.HasValue || !instrs[sizeIndex.Value].IsLdcI4()) { 108 | logger.Error($"Failed to find size value in method 0x{method.MDToken}."); 109 | continue; 110 | } 111 | 112 | int? offsetIndex = method.Body.FindFirstNonNopPrecedingCode(sizeIndex.Value); 113 | if (!offsetIndex.HasValue || !instrs[offsetIndex.Value].IsLdcI4()) { 114 | logger.Error($"Failed to find offset value in method 0x{method.MDToken}."); 115 | continue; 116 | } 117 | 118 | result[method] = new RawMethodData(instrs[offsetIndex.Value].GetLdcI4Value(), instrs[sizeIndex.Value].GetLdcI4Value()); 119 | } 120 | } 121 | 122 | return result; 123 | } 124 | 125 | private static Dictionary DecryptProtectedMethodData(ModuleDefMD module, EmbeddedResource dataResource, IDictionary rawInfo) { 126 | Dictionary result = new Dictionary(); 127 | 128 | using MD5 md5 = MD5.Create(); 129 | 130 | byte[] decryptedResourceData = CawkVMEncryption.SeededRandomKeyXOR(dataResource.CreateReader().ReadRemainingBytes()); 131 | var reader = ByteArrayDataReaderFactory.CreateReader(decryptedResourceData); 132 | 133 | foreach (var rawMethodData in rawInfo) { 134 | reader.Position = (uint)rawMethodData.Value.Offset; 135 | byte[] encryptedData = reader.ReadBytes(rawMethodData.Value.Length); 136 | 137 | byte[] nativeKey = rawMethodData.Key.GetOriginalRawILBytes(module); 138 | byte[] xored = CawkVMEncryption.DecryptNative(encryptedData, nativeKey); 139 | 140 | byte[] rijndaelKey = md5.ComputeHash(Encoding.ASCII.GetBytes(rawMethodData.Key.Name)); 141 | byte[] fullyDecrypted = CawkVMEncryption.DecryptRijndael(xored, rijndaelKey); 142 | result[rawMethodData.Key] = fullyDecrypted; 143 | } 144 | 145 | return result; 146 | } 147 | 148 | private void WriteModule(ModuleDefMD module, string filePath) { 149 | ModuleWriterOptionsBase modOpts; 150 | 151 | if (!module.IsILOnly || module.VTableFixups != null) 152 | modOpts = new NativeModuleWriterOptions(module, true); 153 | else 154 | modOpts = new ModuleWriterOptions(module); 155 | 156 | if (parameters.PreserveMetadata) { 157 | modOpts.MetadataOptions.Flags |= MetadataFlags.PreserveAll; 158 | modOpts.MetadataOptions.PreserveHeapOrder(module, true); 159 | } 160 | 161 | if (parameters.KeepExtraPEData && modOpts is NativeModuleWriterOptions nativeOpts) { 162 | nativeOpts.KeepWin32Resources = true; 163 | nativeOpts.KeepExtraPEData = true; 164 | } 165 | 166 | modOpts.Logger = new DnlibLogger(logger); 167 | modOpts.MetadataLogger = new DnlibLogger(logger); 168 | 169 | if (modOpts is NativeModuleWriterOptions nativeOptions) 170 | module.NativeWrite(filePath, nativeOptions); 171 | else 172 | module.Write(filePath, (ModuleWriterOptions)modOpts); 173 | } 174 | } 175 | } 176 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/VMExceptionHandler.cs: -------------------------------------------------------------------------------- 1 | namespace CawkVMUnpacker.Unpacking { 2 | internal sealed record VMExceptionHandler { 3 | internal int CatchTypeMDToken { get; set; } 4 | internal int FilterStart { get; set; } 5 | internal int HandlerEnd { get; set; } 6 | internal int HandlerStart { get; set; } 7 | internal int HandlerType { get; set; } 8 | internal int TryEnd { get; set; } 9 | internal int TryStart { get; set; } 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /CawkVMUnpacker/Unpacking/VMInstruction.cs: -------------------------------------------------------------------------------- 1 | using dnlib.DotNet.Emit; 2 | 3 | namespace CawkVMUnpacker.Unpacking { 4 | internal sealed record VMInstruction { 5 | internal Code OpCode { get; set; } 6 | internal OperandType OperandType { get; set; } 7 | internal object? Operand { get; set; } 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /CawkVMUnpacker/string2.cs: -------------------------------------------------------------------------------- 1 | using System.Diagnostics.CodeAnalysis; 2 | using System.Runtime.CompilerServices; 3 | 4 | public static class string2 { 5 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 6 | public static bool IsNullOrEmpty([NotNullWhen(false)] string? value) => string.IsNullOrEmpty(value); 7 | } 8 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 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 General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CawkVM Unpacker 2 | A tool designed to restore code protected by CawkVM. 3 | 4 | ![CawkVm Unpacker](https://i.imgur.com/OHTFYaA.jpeg) 5 | 6 | ### Why? 7 | Pretty much every other tool I've seen relies on reflection and uses the original runtime component to construct a DynamicMethod which is then converted to raw CIL. Since invoking methods via reflection may lead to unwanted code executing when misused I decided to create a tool which doesn't use reflection at all. Moreover, I've been hearing a lot that the exisitng versions have bugs/don't work very well so I hope this project will :) 8 | 9 | ### Usage 10 | Pass a file path as an argument and let the magic happen. 11 | 12 | ###### Help, I got an error! 13 | You can use the `-d` argument to specify the name of resource containing method data so the tool doesn't have to go hunting in the forest for it. 14 | 15 | ### License 16 | [GPL-v3.0](https://github.com/ElektroKill/CawkVM-Unpacker/blob/master/LICENSE) 17 | --------------------------------------------------------------------------------