├── .gitattributes ├── .gitignore ├── LICENSE ├── README.md ├── ctf.sectalks_bne.crackme.sln └── ctf.sectalks_bne.crackme ├── App.config ├── CrikeyCon.ico ├── Crypto.cs ├── Program.cs ├── Properties └── AssemblyInfo.cs ├── bin ├── Debug │ └── cracknet.exe └── Release │ ├── cracknet.exe │ ├── cracknet.exe.config │ ├── cracknet.pdb │ ├── cracknet.vshost.exe │ ├── cracknet.vshost.exe.config │ ├── cracknet.vshost.exe.manifest │ ├── ctf.sectalks_bne.crackme.vshost.exe │ ├── ctf.sectalks_bne.crackme.vshost.exe.config │ └── ctf.sectalks_bne.crackme.vshost.exe.manifest ├── ctf.sectalks_bne.crackme.csproj └── obj ├── Debug ├── DesignTimeResolveAssemblyReferencesInput.cache ├── TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs ├── TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs ├── TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs ├── cracknet.exe ├── cracknet.pdb └── ctf.sectalks_bne.crackme.csproj.FileListAbsolute.txt └── Release ├── DesignTimeResolveAssemblyReferencesInput.cache ├── TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs ├── TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs ├── TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs ├── cracknet.exe ├── cracknet.pdb └── ctf.sectalks_bne.crackme.csproj.FileListAbsolute.txt /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). Diff markers may cause the following 21 | # file extensions to fail to load in VS. An alternative would be to treat 22 | # these files as binary and thus will always conflict and require user 23 | # intervention with every merge. To do so, just uncomment the entries below 24 | ############################################################################### 25 | #*.sln merge=binary 26 | #*.csproj merge=binary 27 | #*.vbproj merge=binary 28 | #*.vcxproj merge=binary 29 | #*.vcproj merge=binary 30 | #*.dbproj merge=binary 31 | #*.fsproj merge=binary 32 | #*.lsproj merge=binary 33 | #*.wixproj merge=binary 34 | #*.modelproj merge=binary 35 | #*.sqlproj merge=binary 36 | #*.wwaproj merge=binary 37 | 38 | ############################################################################### 39 | # behavior for image files 40 | # 41 | # image files are treated as binary by default. 42 | ############################################################################### 43 | #*.jpg binary 44 | #*.png binary 45 | #*.gif binary 46 | 47 | ############################################################################### 48 | # diff behavior for common document formats 49 | # 50 | # Convert binary document formats to text before diffing them. This feature 51 | # is only available from the command line. Turn it on by uncommenting the 52 | # entries below. 53 | ############################################################################### 54 | #*.doc diff=astextplain 55 | #*.DOC diff=astextplain 56 | #*.docx diff=astextplain 57 | #*.DOCX diff=astextplain 58 | #*.dot diff=astextplain 59 | #*.DOT diff=astextplain 60 | #*.pdf diff=astextplain 61 | #*.PDF diff=astextplain 62 | #*.rtf diff=astextplain 63 | #*.RTF diff=astextplain 64 | -------------------------------------------------------------------------------- /.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 | *.userosscache 8 | *.sln.docstates 9 | 10 | # User-specific files (MonoDevelop/Xamarin Studio) 11 | *.userprefs 12 | 13 | # Build results 14 | [Dd]ebug/ 15 | [Dd]ebugPublic/ 16 | [Rr]elease/ 17 | [Rr]eleases/ 18 | [Xx]64/ 19 | [Xx]86/ 20 | [Bb]uild/ 21 | bld/ 22 | [Bb]in/ 23 | [Oo]bj/ 24 | 25 | # Visual Studio 2015 cache/options directory 26 | .vs/ 27 | # Uncomment if you have tasks that create the project's static files in wwwroot 28 | #wwwroot/ 29 | 30 | # MSTest test Results 31 | [Tt]est[Rr]esult*/ 32 | [Bb]uild[Ll]og.* 33 | 34 | # NUNIT 35 | *.VisualState.xml 36 | TestResult.xml 37 | 38 | # Build Results of an ATL Project 39 | [Dd]ebugPS/ 40 | [Rr]eleasePS/ 41 | dlldata.c 42 | 43 | # DNX 44 | project.lock.json 45 | artifacts/ 46 | 47 | *_i.c 48 | *_p.c 49 | *_i.h 50 | *.ilk 51 | *.meta 52 | *.obj 53 | *.pch 54 | *.pdb 55 | *.pgc 56 | *.pgd 57 | *.rsp 58 | *.sbr 59 | *.tlb 60 | *.tli 61 | *.tlh 62 | *.tmp 63 | *.tmp_proj 64 | *.log 65 | *.vspscc 66 | *.vssscc 67 | .builds 68 | *.pidb 69 | *.svclog 70 | *.scc 71 | 72 | # Chutzpah Test files 73 | _Chutzpah* 74 | 75 | # Visual C++ cache files 76 | ipch/ 77 | *.aps 78 | *.ncb 79 | *.opendb 80 | *.opensdf 81 | *.sdf 82 | *.cachefile 83 | *.VC.db 84 | 85 | # Visual Studio profiler 86 | *.psess 87 | *.vsp 88 | *.vspx 89 | *.sap 90 | 91 | # TFS 2012 Local Workspace 92 | $tf/ 93 | 94 | # Guidance Automation Toolkit 95 | *.gpState 96 | 97 | # ReSharper is a .NET coding add-in 98 | _ReSharper*/ 99 | *.[Rr]e[Ss]harper 100 | *.DotSettings.user 101 | 102 | # JustCode is a .NET coding add-in 103 | .JustCode 104 | 105 | # TeamCity is a build add-in 106 | _TeamCity* 107 | 108 | # DotCover is a Code Coverage Tool 109 | *.dotCover 110 | 111 | # NCrunch 112 | _NCrunch_* 113 | .*crunch*.local.xml 114 | nCrunchTemp_* 115 | 116 | # MightyMoose 117 | *.mm.* 118 | AutoTest.Net/ 119 | 120 | # Web workbench (sass) 121 | .sass-cache/ 122 | 123 | # Installshield output folder 124 | [Ee]xpress/ 125 | 126 | # DocProject is a documentation generator add-in 127 | DocProject/buildhelp/ 128 | DocProject/Help/*.HxT 129 | DocProject/Help/*.HxC 130 | DocProject/Help/*.hhc 131 | DocProject/Help/*.hhk 132 | DocProject/Help/*.hhp 133 | DocProject/Help/Html2 134 | DocProject/Help/html 135 | 136 | # Click-Once directory 137 | publish/ 138 | 139 | # Publish Web Output 140 | *.[Pp]ublish.xml 141 | *.azurePubxml 142 | 143 | # TODO: Un-comment the next line if you do not want to checkin 144 | # your web deploy settings because they may include unencrypted 145 | # passwords 146 | #*.pubxml 147 | *.publishproj 148 | 149 | # NuGet Packages 150 | *.nupkg 151 | # The packages folder can be ignored because of Package Restore 152 | **/packages/* 153 | # except build/, which is used as an MSBuild target. 154 | !**/packages/build/ 155 | # Uncomment if necessary however generally it will be regenerated when needed 156 | #!**/packages/repositories.config 157 | # NuGet v3's project.json files produces more ignoreable files 158 | *.nuget.props 159 | *.nuget.targets 160 | 161 | # Microsoft Azure Build Output 162 | csx/ 163 | *.build.csdef 164 | 165 | # Microsoft Azure Emulator 166 | ecf/ 167 | rcf/ 168 | 169 | # Microsoft Azure ApplicationInsights config file 170 | ApplicationInsights.config 171 | 172 | # Windows Store app package directory 173 | AppPackages/ 174 | BundleArtifacts/ 175 | 176 | # Visual Studio cache files 177 | # files ending in .cache can be ignored 178 | *.[Cc]ache 179 | # but keep track of directories ending in .cache 180 | !*.[Cc]ache/ 181 | 182 | # Others 183 | ClientBin/ 184 | [Ss]tyle[Cc]op.* 185 | ~$* 186 | *~ 187 | *.dbmdl 188 | *.dbproj.schemaview 189 | *.pfx 190 | *.publishsettings 191 | node_modules/ 192 | orleans.codegen.cs 193 | 194 | # RIA/Silverlight projects 195 | Generated_Code/ 196 | 197 | # Backup & report files from converting an old project file 198 | # to a newer Visual Studio version. Backup files are not needed, 199 | # because we have git ;-) 200 | _UpgradeReport_Files/ 201 | Backup*/ 202 | UpgradeLog*.XML 203 | UpgradeLog*.htm 204 | 205 | # SQL Server files 206 | *.mdf 207 | *.ldf 208 | 209 | # Business Intelligence projects 210 | *.rdl.data 211 | *.bim.layout 212 | *.bim_*.settings 213 | 214 | # Microsoft Fakes 215 | FakesAssemblies/ 216 | 217 | # GhostDoc plugin setting file 218 | *.GhostDoc.xml 219 | 220 | # Node.js Tools for Visual Studio 221 | .ntvs_analysis.dat 222 | 223 | # Visual Studio 6 build log 224 | *.plg 225 | 226 | # Visual Studio 6 workspace options file 227 | *.opt 228 | 229 | # Visual Studio LightSwitch build output 230 | **/*.HTMLClient/GeneratedArtifacts 231 | **/*.DesktopClient/GeneratedArtifacts 232 | **/*.DesktopClient/ModelManifest.xml 233 | **/*.Server/GeneratedArtifacts 234 | **/*.Server/ModelManifest.xml 235 | _Pvt_Extensions 236 | 237 | # LightSwitch generated files 238 | GeneratedArtifacts/ 239 | ModelManifest.xml 240 | 241 | # Paket dependency manager 242 | .paket/paket.exe 243 | 244 | # FAKE - F# Make 245 | .fake/ -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2017 Michael 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # cracknet 2 | A .net Crackme Challenge made for the SecTalks Brisbane 2017 CTF Event. 3 | 4 | [![Twitter](https://img.shields.io/badge/twitter-@codingo__-blue.svg)](https://twitter.com/codingo_) 5 | 6 | ***Intended binary for challenge***: https://github.com/codingo/cracknet/blob/master/ctf.sectalks_bne.crackme/bin/Debug/cracknet.exe 7 | 8 | Note that this is a debug build and not a release build, due to compiler instructions. Only the executable needs to be included for the challenge. 9 | 10 | ## Source Code Notes 11 | 12 | Built with v4.5.2 of .Net (https://www.microsoft.com/en-au/download/details.aspx?id=42642) 13 | 14 | ## Writeup / Solution 15 | 16 | A writeup explaining one solution path for this binary can be found here: https://codingo.github.io/reverse-engineering/ctf/2017/07/25/Decompiling-CSharp-By-Example-with-Cracknet.html 17 | 18 | Further solution notes (including alternative ways to solve this) can be found as code comments within __Program.cs__. 19 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 14 4 | VisualStudioVersion = 14.0.25123.0 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ctf.sectalks_bne.crackme", "ctf.sectalks_bne.crackme\ctf.sectalks_bne.crackme.csproj", "{607604AA-7858-4EC4-A1BF-70EDDDF92459}" 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 | {607604AA-7858-4EC4-A1BF-70EDDDF92459}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {607604AA-7858-4EC4-A1BF-70EDDDF92459}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {607604AA-7858-4EC4-A1BF-70EDDDF92459}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {607604AA-7858-4EC4-A1BF-70EDDDF92459}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | EndGlobal 23 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/App.config: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/CrikeyCon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/codingo/cracknet/68f8104b63055532e1fa6c4cea5c89e97d43058d/ctf.sectalks_bne.crackme/CrikeyCon.ico -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/Crypto.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.IO; 4 | using System.Linq; 5 | using System.Security.Cryptography; 6 | using System.Text; 7 | using System.Threading.Tasks; 8 | 9 | namespace ctf.sectalks_bne.crackme 10 | { 11 | public class Crypto 12 | { 13 | private static byte[] _salt = Encoding.ASCII.GetBytes("o6806642kbM7c5"); 14 | 15 | /// 16 | /// Encrypt the given string using AES. The string can be decrypted using 17 | /// DecryptStringAES(). The sharedSecret parameters must match. 18 | /// 19 | /// The text to encrypt. 20 | /// A password used to generate a key for encryption. 21 | public static string EncryptStringAES(string plainText, string sharedSecret) 22 | { 23 | if (string.IsNullOrEmpty(plainText)) 24 | throw new ArgumentNullException("plainText"); 25 | if (string.IsNullOrEmpty(sharedSecret)) 26 | throw new ArgumentNullException("sharedSecret"); 27 | 28 | string outStr = null; // Encrypted string to return 29 | RijndaelManaged aesAlg = null; // RijndaelManaged object used to encrypt the data. 30 | 31 | try 32 | { 33 | // generate the key from the shared secret and the salt 34 | Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt); 35 | 36 | // Create a RijndaelManaged object 37 | aesAlg = new RijndaelManaged(); 38 | aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8); 39 | 40 | // Create a decryptor to perform the stream transform. 41 | ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV); 42 | 43 | // Create the streams used for encryption. 44 | using (MemoryStream msEncrypt = new MemoryStream()) 45 | { 46 | // prepend the IV 47 | msEncrypt.Write(BitConverter.GetBytes(aesAlg.IV.Length), 0, sizeof(int)); 48 | msEncrypt.Write(aesAlg.IV, 0, aesAlg.IV.Length); 49 | using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) 50 | { 51 | using (StreamWriter swEncrypt = new StreamWriter(csEncrypt)) 52 | { 53 | //Write all data to the stream. 54 | swEncrypt.Write(plainText); 55 | } 56 | } 57 | outStr = Convert.ToBase64String(msEncrypt.ToArray()); 58 | } 59 | } 60 | finally 61 | { 62 | // Clear the RijndaelManaged object. 63 | if (aesAlg != null) 64 | aesAlg.Clear(); 65 | } 66 | 67 | // Return the encrypted bytes from the memory stream. 68 | return outStr; 69 | } 70 | 71 | /// 72 | /// Decrypt the given string. Assumes the string was encrypted using 73 | /// EncryptStringAES(), using an identical sharedSecret. 74 | /// 75 | /// The text to decrypt. 76 | /// A password used to generate a key for decryption. 77 | public static string DecryptStringAES(string cipherText) 78 | { 79 | if (string.IsNullOrEmpty(cipherText)) 80 | throw new ArgumentNullException("cipherText"); 81 | 82 | // Declare the RijndaelManaged object 83 | // used to decrypt the data. 84 | RijndaelManaged aesAlg = null; 85 | 86 | // Declare the string used to hold 87 | // the decrypted text. 88 | string plaintext = null; 89 | 90 | try 91 | { 92 | // generate the key from the shared secret and the salt 93 | Rfc2898DeriveBytes key = new Rfc2898DeriveBytes("73 65 63 74 61 6c 6b 73", _salt); 94 | 95 | // Create the streams used for decryption. 96 | byte[] bytes = Convert.FromBase64String(cipherText); 97 | using (MemoryStream msDecrypt = new MemoryStream(bytes)) 98 | { 99 | // Create a RijndaelManaged object 100 | // with the specified key and IV. 101 | aesAlg = new RijndaelManaged(); 102 | aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8); 103 | // Get the initialization vector from the encrypted stream 104 | aesAlg.IV = ReadByteArray(msDecrypt); 105 | // Create a decrytor to perform the stream transform. 106 | ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV); 107 | using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) 108 | { 109 | using (StreamReader srDecrypt = new StreamReader(csDecrypt)) 110 | 111 | // Read the decrypted bytes from the decrypting stream 112 | // and place them in a string. 113 | plaintext = srDecrypt.ReadToEnd(); 114 | } 115 | } 116 | } 117 | finally 118 | { 119 | // Clear the RijndaelManaged object. 120 | if (aesAlg != null) 121 | aesAlg.Clear(); 122 | } 123 | 124 | return plaintext; 125 | } 126 | 127 | private static byte[] ReadByteArray(Stream s) 128 | { 129 | byte[] rawLength = new byte[sizeof(int)]; 130 | if (s.Read(rawLength, 0, rawLength.Length) != rawLength.Length) 131 | { 132 | throw new SystemException("Stream did not contain properly formatted byte array"); 133 | } 134 | 135 | byte[] buffer = new byte[BitConverter.ToInt32(rawLength, 0)]; 136 | if (s.Read(buffer, 0, buffer.Length) != buffer.Length) 137 | { 138 | throw new SystemException("Did not read byte array properly"); 139 | } 140 | 141 | return buffer; 142 | } 143 | } 144 | } 145 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Diagnostics; 4 | using System.Linq; 5 | using System.Text; 6 | using System.Threading; 7 | using System.Threading.Tasks; 8 | 9 | /*** 10 | * CrackMe Challenge made for the Brisbane SecTalks 2017 CTF Challenge (http://www.sectalks.org/) 11 | * Created by @codingo_ 12 | * 11-April-2017 13 | * 14 | * Please compile using the debug manifest to ensure 'string' text is included within the binary. 15 | * No dependancies besides .net installed need to be present. Just the cracknet.exe can be included in the 16 | * ctf release. Name is intended to be a hint. 17 | * **/ 18 | 19 | namespace ctf.sectalks_bne.crackme 20 | { 21 | class Program 22 | { 23 | private static void Main(string[] args) 24 | { 25 | // Use this to produce a new flag. Make sure the outputted result is added to the flag output 26 | //var encryptedString = Crypto.EncryptStringAES("flag{7h3_f0rc3_15_w17h_y0u}", "73 65 63 74 61 6c 6b 73"); 27 | //Console.WriteLine($"New flag string: {encryptedString}"); 28 | //Console.ReadKey(); 29 | 30 | // use to produce a new passphrase. Ensure in lower case as input is lowered in routine. 31 | //var passphrase = Crypto.EncryptStringAES("the high ground", "73 65 63 74 61 6c 6b 73"); 32 | //Console.WriteLine($"New passphrase: {passphrase}"); 33 | //Console.ReadKey(); 34 | 35 | // pointless string inclusion to show up if strings is used to reverse binary or when loaded in immunity 36 | const string pointless = "flag{Not a real flag. Strings would be too easy"; 37 | Debug.WriteLine(pointless); 38 | 39 | Program.PrintBanner(); 40 | 41 | var guesses = 5; 42 | 43 | while (true) 44 | { 45 | if (guesses < 1) PrintGameOver(); 46 | 47 | PrintTimer(3); 48 | PrintGuesses(guesses); 49 | 50 | Console.Write("Enter password: "); 51 | var input = Console.ReadLine(); 52 | 53 | var password = 54 | Crypto.DecryptStringAES("EAAAAOkz8XiBpPhe0j3CnxGt4D5Qb0H2vh9/IeXrt1w4r313"); 55 | 56 | if (input != null && input.ToLower().Equals(password)) 57 | { 58 | Console.WriteLine($"Success! Flag: {Crypto.DecryptStringAES("EAAAAB+ljfnegBraKanx/SJLBfrGhIDfffz8MOc922hrm0aK44KwgXmu9GHrIU+LjyBwmQ==")}!"); 59 | 60 | StarWars(); 61 | Environment.Exit(0); 62 | } 63 | 64 | guesses--; 65 | 66 | Console.WriteLine($"Incorrect! Please wait to try again."); 67 | 68 | Console.Beep(350, 250); 69 | Console.Beep(300, 500); 70 | } 71 | } 72 | 73 | public static void PrintBanner() 74 | { 75 | Console.WriteLine("\n __ __ "); 76 | Console.WriteLine(" ________________ ____ | | __ ____ _____/ |_ "); 77 | Console.WriteLine("_/ ___\\_ __ \\__ \\ _/ ___\\| |/ // \\_/ __ \\ __\\"); 78 | Console.WriteLine("\\ \\___| | \\// __ \\ \\___| <| | \\ ___/| | "); 79 | Console.WriteLine(" \\___ >__| (____ /\\___ >__|_ \\___| /\\___ >__| "); 80 | Console.WriteLine(" \\/ \\/ \\/ \\/ \\/ \\/ "); 81 | } 82 | 83 | private static void PrintGameOver() 84 | { 85 | Console.WriteLine(" _____ __ __ ______ ______ ________ _____ _ "); 86 | Console.WriteLine(" / ____| /\\ | \\/ | ____| / __ \\ \\ / / ____| __ \\| |"); 87 | Console.WriteLine(" | | __ / \\ | \\ / | |__ | | | \\ \\ / /| |__ | |__) | |"); 88 | Console.WriteLine(" | | |_ | / /\\ \\ | |\\/| | __| | | | |\\ \\/ / | __| | _ /| |"); 89 | Console.WriteLine(" | |__| |/ ____ \\| | | | |____ | |__| | \\ / | |____| | \\ \\|_|"); 90 | Console.WriteLine(" \\_____/_/ \\_\\_| |_|______| \\____/ \\/ |______|_| \\_(_)"); 91 | Console.WriteLine(" ________________________________________________________________________ "); 92 | Console.WriteLine("|________________________________________________________________________|"); 93 | 94 | Mario(); 95 | 96 | Environment.Exit(0); 97 | } 98 | 99 | public static void PrintTimer(int seconds) 100 | { 101 | for (var i = seconds; i >= 0; --i) 102 | { 103 | var originalLeft = Console.CursorLeft; 104 | var originalTop = Console.CursorTop; 105 | 106 | Console.ForegroundColor = ConsoleColor.Yellow; 107 | Console.CursorLeft = 0; 108 | Console.CursorTop = 0; 109 | 110 | Console.Write("You can make another guess in: {0}", i); 111 | 112 | Console.CursorLeft = originalLeft; 113 | Console.CursorTop = originalTop; 114 | 115 | Thread.Sleep(1000); 116 | } 117 | } 118 | 119 | public static void PrintGuesses(int remainingGuesses) 120 | { 121 | var originalLeft = Console.CursorLeft; 122 | var originalTop = Console.CursorTop; 123 | 124 | Console.CursorLeft = 0; 125 | Console.CursorTop = 0; 126 | Console.ForegroundColor = ConsoleColor.White; 127 | 128 | if (remainingGuesses == 1) 129 | { 130 | var originalColour = Console.BackgroundColor; 131 | Console.BackgroundColor = ConsoleColor.Red; 132 | Console.Write($"You only have one guess remaining!"); 133 | Console.BackgroundColor = originalColour; 134 | } 135 | else 136 | { 137 | Console.Write($"You have {remainingGuesses}/5 guesses remaining!!"); 138 | } 139 | 140 | Console.CursorLeft = originalLeft; 141 | Console.CursorTop = originalTop; 142 | } 143 | 144 | private static void StarWars() 145 | { 146 | Console.Beep(300, 500); 147 | Thread.Sleep(50); 148 | Console.Beep(300, 500); 149 | Thread.Sleep(50); 150 | Console.Beep(300, 500); 151 | Thread.Sleep(50); 152 | Console.Beep(250, 500); 153 | Thread.Sleep(50); 154 | Console.Beep(350, 250); 155 | Console.Beep(300, 500); 156 | Thread.Sleep(50); 157 | Console.Beep(250, 500); 158 | Thread.Sleep(50); 159 | Console.Beep(350, 250); 160 | Console.Beep(300, 500); 161 | Thread.Sleep(50); 162 | } 163 | 164 | private static void Mario() 165 | { 166 | Console.Beep(659, 125); 167 | Console.Beep(659, 125); 168 | Thread.Sleep(125); 169 | Console.Beep(659, 125); 170 | Thread.Sleep(167); 171 | Console.Beep(523, 125); 172 | Console.Beep(659, 125); 173 | Thread.Sleep(125); 174 | Console.Beep(784, 125); 175 | Thread.Sleep(375); 176 | Console.Beep(392, 125); 177 | } 178 | } 179 | } 180 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/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("cracknet")] 9 | [assembly: AssemblyDescription(".Net Crackme made for the Brisbane SecTalks 2017 CTF")] 10 | [assembly: AssemblyConfiguration("")] 11 | [assembly: AssemblyCompany("Michael 'codingo' Skelton")] 12 | [assembly: AssemblyProduct("ctf.sectalks_bne.crackme")] 13 | [assembly: AssemblyCopyright("Copyright © 2017")] 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("607604aa-7858-4ec4-a1bf-70edddf92459")] 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 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/bin/Debug/cracknet.exe: -------------------------------------------------------------------------------- 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10 | 11 | 12 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/ctf.sectalks_bne.crackme.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Debug 6 | AnyCPU 7 | {607604AA-7858-4EC4-A1BF-70EDDDF92459} 8 | Exe 9 | Properties 10 | ctf.sectalks_bne.crackme 11 | cracknet 12 | v4.5.2 13 | 512 14 | true 15 | 16 | 17 | AnyCPU 18 | true 19 | full 20 | false 21 | bin\Debug\ 22 | DEBUG;TRACE 23 | prompt 24 | 4 25 | 26 | 27 | AnyCPU 28 | pdbonly 29 | true 30 | bin\Release\ 31 | TRACE 32 | prompt 33 | 4 34 | 35 | 36 | CrikeyCon.ico 37 | 38 | 39 | ctf.sectalks_bne.crackme.Program 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 70 | -------------------------------------------------------------------------------- /ctf.sectalks_bne.crackme/obj/Debug/DesignTimeResolveAssemblyReferencesInput.cache: 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