├── .gitignore ├── README.md ├── SharpCryptUnprotectData.sln ├── SharpCryptUnprotectData ├── Program.cs ├── Properties │ └── AssemblyInfo.cs └── SharpCryptUnprotectData.csproj └── example.png /.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 | [Ww][Ii][Nn]32/ 27 | [Aa][Rr][Mm]/ 28 | [Aa][Rr][Mm]64/ 29 | bld/ 30 | [Bb]in/ 31 | [Oo]bj/ 32 | [Ll]og/ 33 | [Ll]ogs/ 34 | 35 | # Visual Studio 2015/2017 cache/options directory 36 | .vs/ 37 | # Uncomment if you have tasks that create the project's static files in wwwroot 38 | #wwwroot/ 39 | 40 | # Visual Studio 2017 auto generated files 41 | Generated\ Files/ 42 | 43 | # MSTest test Results 44 | [Tt]est[Rr]esult*/ 45 | [Bb]uild[Ll]og.* 46 | 47 | # NUnit 48 | *.VisualState.xml 49 | TestResult.xml 50 | nunit-*.xml 51 | 52 | # Build Results of an ATL Project 53 | [Dd]ebugPS/ 54 | [Rr]eleasePS/ 55 | dlldata.c 56 | 57 | # Benchmark Results 58 | BenchmarkDotNet.Artifacts/ 59 | 60 | # .NET Core 61 | project.lock.json 62 | project.fragment.lock.json 63 | artifacts/ 64 | 65 | # ASP.NET Scaffolding 66 | ScaffoldingReadMe.txt 67 | 68 | # StyleCop 69 | StyleCopReport.xml 70 | 71 | # Files built by Visual Studio 72 | *_i.c 73 | *_p.c 74 | *_h.h 75 | *.ilk 76 | *.meta 77 | *.obj 78 | *.iobj 79 | *.pch 80 | *.pdb 81 | *.ipdb 82 | *.pgc 83 | *.pgd 84 | *.rsp 85 | *.sbr 86 | *.tlb 87 | *.tli 88 | *.tlh 89 | *.tmp 90 | *.tmp_proj 91 | *_wpftmp.csproj 92 | *.log 93 | *.vspscc 94 | *.vssscc 95 | .builds 96 | *.pidb 97 | *.svclog 98 | *.scc 99 | 100 | # Chutzpah Test files 101 | _Chutzpah* 102 | 103 | # Visual C++ cache files 104 | ipch/ 105 | *.aps 106 | *.ncb 107 | *.opendb 108 | *.opensdf 109 | *.sdf 110 | *.cachefile 111 | *.VC.db 112 | *.VC.VC.opendb 113 | 114 | # Visual Studio profiler 115 | *.psess 116 | *.vsp 117 | *.vspx 118 | *.sap 119 | 120 | # Visual Studio Trace Files 121 | *.e2e 122 | 123 | # TFS 2012 Local Workspace 124 | $tf/ 125 | 126 | # Guidance Automation Toolkit 127 | *.gpState 128 | 129 | # ReSharper is a .NET coding add-in 130 | _ReSharper*/ 131 | *.[Rr]e[Ss]harper 132 | *.DotSettings.user 133 | 134 | # TeamCity is a build add-in 135 | _TeamCity* 136 | 137 | # DotCover is a Code Coverage Tool 138 | *.dotCover 139 | 140 | # AxoCover is a Code Coverage Tool 141 | .axoCover/* 142 | !.axoCover/settings.json 143 | 144 | # Coverlet is a free, cross platform Code Coverage Tool 145 | coverage*.json 146 | coverage*.xml 147 | coverage*.info 148 | 149 | # Visual Studio code coverage results 150 | *.coverage 151 | *.coveragexml 152 | 153 | # NCrunch 154 | _NCrunch_* 155 | .*crunch*.local.xml 156 | nCrunchTemp_* 157 | 158 | # MightyMoose 159 | *.mm.* 160 | AutoTest.Net/ 161 | 162 | # Web workbench (sass) 163 | .sass-cache/ 164 | 165 | # Installshield output folder 166 | [Ee]xpress/ 167 | 168 | # DocProject is a documentation generator add-in 169 | DocProject/buildhelp/ 170 | DocProject/Help/*.HxT 171 | DocProject/Help/*.HxC 172 | DocProject/Help/*.hhc 173 | DocProject/Help/*.hhk 174 | DocProject/Help/*.hhp 175 | DocProject/Help/Html2 176 | DocProject/Help/html 177 | 178 | # Click-Once directory 179 | publish/ 180 | 181 | # Publish Web Output 182 | *.[Pp]ublish.xml 183 | *.azurePubxml 184 | # Note: Comment the next line if you want to checkin your web deploy settings, 185 | # but database connection strings (with potential passwords) will be unencrypted 186 | *.pubxml 187 | *.publishproj 188 | 189 | # Microsoft Azure Web App publish settings. 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Might be handy if you don't have the domain backup key or the user's password. 7 | 8 | Pass in b64 encoded + DPAPI encrypted blob, decrypt, get b64 encoded + decrypted blob, profit. 9 | 10 | Can write output to a file if you've converted this to shellcode using something like Donut and are executing it that way. -------------------------------------------------------------------------------- /SharpCryptUnprotectData.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.30011.22 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharpCryptUnprotectData", "SharpCryptUnprotectData\SharpCryptUnprotectData.csproj", "{FB427D9E-C759-432B-9533-8023F45618D3}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Debug|x64 = Debug|x64 12 | Release|Any CPU = Release|Any CPU 13 | Release|x64 = Release|x64 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {FB427D9E-C759-432B-9533-8023F45618D3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 17 | {FB427D9E-C759-432B-9533-8023F45618D3}.Debug|Any CPU.Build.0 = Debug|Any CPU 18 | {FB427D9E-C759-432B-9533-8023F45618D3}.Debug|x64.ActiveCfg = Debug|x64 19 | {FB427D9E-C759-432B-9533-8023F45618D3}.Debug|x64.Build.0 = Debug|x64 20 | {FB427D9E-C759-432B-9533-8023F45618D3}.Release|Any CPU.ActiveCfg = Release|Any CPU 21 | {FB427D9E-C759-432B-9533-8023F45618D3}.Release|Any CPU.Build.0 = Release|Any CPU 22 | {FB427D9E-C759-432B-9533-8023F45618D3}.Release|x64.ActiveCfg = Release|x64 23 | {FB427D9E-C759-432B-9533-8023F45618D3}.Release|x64.Build.0 = Release|x64 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {82A980D1-D486-4205-9518-FCB18BD56727} 30 | EndGlobalSection 31 | EndGlobal 32 | -------------------------------------------------------------------------------- /SharpCryptUnprotectData/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Runtime.InteropServices; 3 | using System.Linq; 4 | using System.IO; 5 | 6 | namespace SharpCryptUnprotectData 7 | { 8 | class Program 9 | { 10 | // Source for structures and P/Invoke: https://github.com/vincepare/DPAPIbridge/blob/master/src/DPAPI.cs 11 | // Wrapper for DPAPI CryptUnprotectData function. 12 | [DllImport("crypt32.dll", 13 | SetLastError = true, 14 | CharSet = System.Runtime.InteropServices.CharSet.Auto)] 15 | private static extern 16 | bool CryptUnprotectData(ref DATA_BLOB pCipherText, 17 | string pszDescription, 18 | DATA_BLOB pEntropy, 19 | IntPtr pReserved, 20 | CRYPTPROTECT_PROMPTSTRUCT pPrompt, 21 | int dwFlags, 22 | ref DATA_BLOB pPlainText); 23 | 24 | // BLOB structure used to pass data to DPAPI functions. 25 | [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] 26 | internal struct DATA_BLOB 27 | { 28 | public int cbData; 29 | public IntPtr pbData; 30 | } 31 | 32 | // Prompt structure to be used for required parameters. 33 | [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] 34 | internal struct CRYPTPROTECT_PROMPTSTRUCT 35 | { 36 | public int cbSize; 37 | public int dwPromptFlags; 38 | public IntPtr hwndApp; 39 | public string szPrompt; 40 | } 41 | 42 | static void Help() 43 | { 44 | Console.WriteLine("Help: SharpCryptUnprotectData.exe -h/-help"); 45 | Console.WriteLine("Usage: SharpCryptUnprotectData.exe -data "); 46 | Console.WriteLine(" SharpCryptUnprotectData.exe -outfile slyd0g.txt -data "); 47 | } 48 | 49 | static void Main(string[] args) 50 | { 51 | // Print help if no args 52 | if (args == null || args.Length == 0 || (args[0] == "-h") || (args[0] == "-help")) 53 | { 54 | Help(); 55 | System.Environment.Exit(0); 56 | } 57 | 58 | // Check for -outfile 59 | if (args.Contains("-outfile")) { 60 | int outfileIndex = Array.IndexOf(args, "-outfile") + 1; 61 | string outfileName = args[outfileIndex]; 62 | 63 | // https://stackoverflow.com/questions/4470700/how-to-save-console-writeline-output-to-text-file/4470751 64 | FileStream filestream = new FileStream(outfileName, FileMode.Create); 65 | var streamwriter = new StreamWriter(filestream); 66 | streamwriter.AutoFlush = true; 67 | Console.SetOut(streamwriter); 68 | Console.SetError(streamwriter); 69 | } 70 | 71 | // Read b64 string from commandline 72 | byte[] b64Input = null; 73 | if (args.Contains("-data")) 74 | { 75 | int dataIndex = Array.IndexOf(args, "-data") + 1; 76 | b64Input = Convert.FromBase64String(args[dataIndex]); 77 | } 78 | else 79 | { 80 | Help(); 81 | System.Environment.Exit(0); 82 | } 83 | 84 | // Convert b64 string into DATA_BLOB struct 85 | DATA_BLOB dataIn; 86 | GCHandle pinnedArray = GCHandle.Alloc(b64Input, GCHandleType.Pinned); 87 | dataIn.pbData = pinnedArray.AddrOfPinnedObject(); 88 | dataIn.cbData = b64Input.Length; 89 | Console.WriteLine("[+] Encrypted Blob Length: {0}", dataIn.cbData); 90 | 91 | // Prepare other paramters for CryptUnprotectData() call 92 | DATA_BLOB dataOut = new DATA_BLOB(); 93 | DATA_BLOB optionalEntropy = new DATA_BLOB(); 94 | CRYPTPROTECT_PROMPTSTRUCT promptStruct = new CRYPTPROTECT_PROMPTSTRUCT(); 95 | 96 | // Call CryptUnprotectData() 97 | bool success = CryptUnprotectData(ref dataIn, null, optionalEntropy, IntPtr.Zero, promptStruct, 0, ref dataOut); 98 | if (success) 99 | { 100 | byte[] decryptedBytes = new byte[dataOut.cbData]; 101 | Marshal.Copy(dataOut.pbData, decryptedBytes, 0, dataOut.cbData); 102 | var b64Output = Convert.ToBase64String(decryptedBytes); 103 | 104 | Console.WriteLine("[+] CryptUnprotectData() success!"); 105 | Console.WriteLine(" |-> Decrypted Blob Length: {0}", dataOut.cbData); 106 | Console.WriteLine(" |-> Base64 Encoded Blob: {0}", b64Output); 107 | } 108 | else 109 | { 110 | Console.WriteLine("[-] CryptUnprotectData() failed with error: {0}", Marshal.GetLastWin32Error()); 111 | } 112 | pinnedArray.Free(); 113 | } 114 | } 115 | } -------------------------------------------------------------------------------- /SharpCryptUnprotectData/Properties/AssemblyInfo.cs: -------------------------------------------------------------------------------- 1 | using System.Reflection; 2 | using System.Runtime.CompilerServices; 3 | using System.Runtime.InteropServices; 4 | 5 | // General Information about an assembly is controlled through the following 6 | // set of attributes. Change these attribute values to modify the information 7 | // associated with an assembly. 8 | [assembly: AssemblyTitle("SharpCryptUnprotectData")] 9 | [assembly: AssemblyDescription("")] 10 | [assembly: AssemblyConfiguration("")] 11 | [assembly: AssemblyCompany("")] 12 | [assembly: AssemblyProduct("SharpCryptUnprotectData")] 13 | [assembly: AssemblyCopyright("Copyright © 2022")] 14 | [assembly: AssemblyTrademark("")] 15 | [assembly: AssemblyCulture("")] 16 | 17 | // Setting ComVisible to false makes the types in this assembly not visible 18 | // to COM components. If you need to access a type in this assembly from 19 | // COM, set the ComVisible attribute to true on that type. 20 | [assembly: ComVisible(false)] 21 | 22 | // The following GUID is for the ID of the typelib if this project is exposed to COM 23 | [assembly: Guid("fb427d9e-c759-432b-9533-8023f45618d3")] 24 | 25 | // Version information for an assembly consists of the following four values: 26 | // 27 | // Major Version 28 | // Minor Version 29 | // Build Number 30 | // Revision 31 | // 32 | // You can specify all the values or you can default the Build and Revision Numbers 33 | // by using the '*' as shown below: 34 | // [assembly: AssemblyVersion("1.0.*")] 35 | [assembly: AssemblyVersion("1.0.0.0")] 36 | [assembly: AssemblyFileVersion("1.0.0.0")] 37 | -------------------------------------------------------------------------------- /SharpCryptUnprotectData/SharpCryptUnprotectData.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Debug 6 | AnyCPU 7 | {FB427D9E-C759-432B-9533-8023F45618D3} 8 | Exe 9 | SharpCryptUnprotectData 10 | SharpCryptUnprotectData 11 | v4.0 12 | 512 13 | true 14 | 15 | 16 | AnyCPU 17 | true 18 | full 19 | false 20 | bin\Debug\ 21 | DEBUG;TRACE 22 | prompt 23 | 4 24 | 25 | 26 | AnyCPU 27 | pdbonly 28 | true 29 | bin\Release\ 30 | TRACE 31 | prompt 32 | 4 33 | 34 | 35 | true 36 | bin\x64\Debug\ 37 | DEBUG;TRACE 38 | full 39 | x64 40 | 7.3 41 | prompt 42 | MinimumRecommendedRules.ruleset 43 | 44 | 45 | bin\x64\Release\ 46 | TRACE 47 | true 48 | pdbonly 49 | x64 50 | 7.3 51 | prompt 52 | MinimumRecommendedRules.ruleset 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | -------------------------------------------------------------------------------- /example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/slyd0g/SharpCryptUnprotectData/d2c88cf95ca5ac9c5c84505be6844fb0ab1bdbf8/example.png --------------------------------------------------------------------------------