Decrypt strings
This commit is contained in:
parent
03a8372319
commit
f37a46a02b
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@ -73,6 +73,7 @@
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<Compile Include="deobfuscators\dotNET_Reactor\EncryptedResource.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\EncryptedResource.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\LocalTypes.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\LocalTypes.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\MethodsDecrypter.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\MethodsDecrypter.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\StringDecrypter.cs" />
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<Compile Include="deobfuscators\Eazfuscator\Deobfuscator.cs" />
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<Compile Include="deobfuscators\Eazfuscator\Deobfuscator.cs" />
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<Compile Include="deobfuscators\ExceptionLoggerRemover.cs" />
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<Compile Include="deobfuscators\ExceptionLoggerRemover.cs" />
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<Compile Include="deobfuscators\IDeobfuscatedFile.cs" />
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<Compile Include="deobfuscators\IDeobfuscatedFile.cs" />
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@ -17,6 +17,7 @@
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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*/
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using System.IO;
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using System.Collections.Generic;
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using System.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil;
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using de4dot.blocks;
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using de4dot.blocks;
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@ -50,7 +51,10 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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class Deobfuscator : DeobfuscatorBase {
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class Deobfuscator : DeobfuscatorBase {
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Options options;
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Options options;
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PE.PeImage peImage;
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byte[] fileData;
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MethodsDecrypter methodsDecrypter;
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MethodsDecrypter methodsDecrypter;
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StringDecrypter stringDecrypter;
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internal class Options : OptionsBase {
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internal class Options : OptionsBase {
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}
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}
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@ -76,7 +80,11 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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int val = 0;
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int val = 0;
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if (methodsDecrypter.Detected)
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if (methodsDecrypter.Detected)
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val = 100;
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val += 100;
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else if (stringDecrypter.Detected)
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val += 100;
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if (methodsDecrypter.Detected && stringDecrypter.Detected)
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val += 10;
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return val;
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return val;
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}
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}
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@ -84,21 +92,43 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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protected override void scanForObfuscator() {
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protected override void scanForObfuscator() {
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methodsDecrypter = new MethodsDecrypter(module);
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methodsDecrypter = new MethodsDecrypter(module);
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methodsDecrypter.find();
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methodsDecrypter.find();
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find();
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}
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}
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public override byte[] getDecryptedModule() {
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public override byte[] getDecryptedModule() {
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return methodsDecrypter.decrypt(DeobfuscatedFile);
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using (var fileStream = new FileStream(module.FullyQualifiedName, FileMode.Open, FileAccess.Read, FileShare.Read)) {
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fileData = new byte[(int)fileStream.Length];
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fileStream.Read(fileData, 0, fileData.Length);
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}
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peImage = new PE.PeImage(fileData);
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if (!methodsDecrypter.decrypt(peImage, DeobfuscatedFile))
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return null;
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return fileData;
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}
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}
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public override IDeobfuscator moduleReloaded(ModuleDefinition module) {
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public override IDeobfuscator moduleReloaded(ModuleDefinition module) {
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var newOne = new Deobfuscator(options);
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var newOne = new Deobfuscator(options);
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newOne.setModule(module);
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newOne.setModule(module);
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newOne.peImage = new PE.PeImage(fileData);
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newOne.methodsDecrypter = new MethodsDecrypter(module, methodsDecrypter);
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newOne.methodsDecrypter = new MethodsDecrypter(module, methodsDecrypter);
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newOne.stringDecrypter = new StringDecrypter(module, stringDecrypter);
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return newOne;
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return newOne;
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}
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}
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public override void deobfuscateBegin() {
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public override void deobfuscateBegin() {
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base.deobfuscateBegin();
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base.deobfuscateBegin();
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stringDecrypter.init(peImage, DeobfuscatedFile);
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foreach (var info in stringDecrypter.DecrypterInfos) {
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staticStringDecrypter.add(info.method, (method2, args) => {
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return stringDecrypter.decrypt(method2, (int)args[0]);
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});
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}
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DeobfuscatedFile.stringDecryptersAdded();
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}
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}
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public override void deobfuscateMethodEnd(Blocks blocks) {
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public override void deobfuscateMethodEnd(Blocks blocks) {
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@ -111,6 +141,8 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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public override IEnumerable<string> getStringDecrypterMethods() {
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public override IEnumerable<string> getStringDecrypterMethods() {
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var list = new List<string>();
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var list = new List<string>();
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foreach (var info in stringDecrypter.DecrypterInfos)
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list.Add(info.method.MetadataToken.ToInt32().ToString("X8"));
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return list;
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return list;
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}
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}
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}
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}
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@ -44,16 +44,20 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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public EncryptedResource(ModuleDefinition module, EncryptedResource oldOne) {
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public EncryptedResource(ModuleDefinition module, EncryptedResource oldOne) {
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this.module = module;
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this.module = module;
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if (oldOne.resourceDecrypterMethod != null)
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resourceDecrypterMethod = module.LookupToken(oldOne.resourceDecrypterMethod.MetadataToken.ToInt32()) as MethodDefinition;
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resourceDecrypterMethod = module.LookupToken(oldOne.resourceDecrypterMethod.MetadataToken.ToInt32()) as MethodDefinition;
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if (oldOne.encryptedDataResource != null)
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encryptedDataResource = DotNetUtils.getResource(module, oldOne.encryptedDataResource.Name) as EmbeddedResource;
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encryptedDataResource = DotNetUtils.getResource(module, oldOne.encryptedDataResource.Name) as EmbeddedResource;
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key = oldOne.key;
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key = oldOne.key;
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iv = oldOne.iv;
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iv = oldOne.iv;
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if (resourceDecrypterMethod == null || encryptedDataResource == null || key == null || iv == null)
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if (resourceDecrypterMethod == null && oldOne.resourceDecrypterMethod != null)
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throw new ApplicationException("Could not initialize EncryptedResource");
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if (encryptedDataResource == null && oldOne.encryptedDataResource != null)
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throw new ApplicationException("Could not initialize EncryptedResource");
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throw new ApplicationException("Could not initialize EncryptedResource");
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}
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}
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public bool couldBeResourceDecrypter(MethodDefinition method) {
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public bool couldBeResourceDecrypter(MethodDefinition method, IList<string> additionalTypes) {
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if (!method.IsStatic)
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if (!method.IsStatic)
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return false;
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return false;
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if (method.Body == null)
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if (method.Body == null)
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@ -61,18 +65,16 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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if (method.Body.Instructions.Count < 1000)
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if (method.Body.Instructions.Count < 1000)
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return false;
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return false;
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var localTypes = new LocalTypes(method.Body.Variables);
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var localTypes = new LocalTypes(method);
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var requiredTypes = new string[] {
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var requiredTypes = new List<string> {
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"System.Byte[]",
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"System.Byte[]",
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"System.Diagnostics.StackFrame",
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"System.IntPtr",
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"System.IO.BinaryReader",
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"System.IO.BinaryReader",
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"System.IO.MemoryStream",
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"System.IO.MemoryStream",
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"System.Reflection.Assembly",
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"System.Security.Cryptography.CryptoStream",
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"System.Security.Cryptography.CryptoStream",
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"System.Security.Cryptography.ICryptoTransform",
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"System.Security.Cryptography.ICryptoTransform",
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"System.Security.Cryptography.RijndaelManaged",
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"System.Security.Cryptography.RijndaelManaged",
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};
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};
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requiredTypes.AddRange(additionalTypes);
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if (!localTypes.all(requiredTypes))
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if (!localTypes.all(requiredTypes))
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return false;
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return false;
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@ -19,12 +19,17 @@
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using System;
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using System;
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using System.Collections.Generic;
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using System.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Mono.Cecil.Cil;
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namespace de4dot.deobfuscators.dotNET_Reactor {
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namespace de4dot.deobfuscators.dotNET_Reactor {
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class LocalTypes {
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class LocalTypes {
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Dictionary<string, int> localTypes = new Dictionary<string, int>(StringComparer.Ordinal);
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Dictionary<string, int> localTypes = new Dictionary<string, int>(StringComparer.Ordinal);
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public LocalTypes(MethodDefinition method)
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: this(method.Body.Variables) {
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}
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public LocalTypes(IList<VariableDefinition> locals) {
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public LocalTypes(IList<VariableDefinition> locals) {
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foreach (var local in locals) {
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foreach (var local in locals) {
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var key = local.VariableType.FullName;
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var key = local.VariableType.FullName;
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@ -38,7 +43,7 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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return localTypes.ContainsKey(typeFullName);
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return localTypes.ContainsKey(typeFullName);
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}
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}
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public bool all(string[] types) {
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public bool all(IList<string> types) {
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foreach (var typeName in types) {
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foreach (var typeName in types) {
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if (!exists(typeName))
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if (!exists(typeName))
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return false;
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return false;
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@ -46,6 +46,11 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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}
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}
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public void find() {
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public void find() {
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var additionalTypes = new string[] {
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"System.Diagnostics.StackFrame",
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"System.IntPtr",
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"System.Reflection.Assembly",
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};
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var checkedMethods = new Dictionary<MethodReferenceAndDeclaringTypeKey, bool>();
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var checkedMethods = new Dictionary<MethodReferenceAndDeclaringTypeKey, bool>();
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var callCounter = new CallCounter();
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var callCounter = new CallCounter();
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int typesLeft = 30;
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int typesLeft = 30;
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checkedMethods[key] = true;
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checkedMethods[key] = true;
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if (!DotNetUtils.isMethod(method, "System.Void", "()"))
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if (!DotNetUtils.isMethod(method, "System.Void", "()"))
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continue;
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continue;
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if (!encryptedResource.couldBeResourceDecrypter(method))
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if (!encryptedResource.couldBeResourceDecrypter(method, additionalTypes))
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continue;
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continue;
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}
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}
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callCounter.add(method);
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callCounter.add(method);
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@ -73,9 +78,9 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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encryptedResource.ResourceDecrypterMethod = (MethodDefinition)callCounter.most();
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encryptedResource.ResourceDecrypterMethod = (MethodDefinition)callCounter.most();
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}
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}
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public byte[] decrypt(ISimpleDeobfuscator simpleDeobfuscator) {
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public bool decrypt(PE.PeImage peImage, ISimpleDeobfuscator simpleDeobfuscator) {
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if (encryptedResource.ResourceDecrypterMethod == null)
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if (encryptedResource.ResourceDecrypterMethod == null)
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return null;
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return false;
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encryptedResource.init(simpleDeobfuscator);
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encryptedResource.init(simpleDeobfuscator);
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initXorKey();
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initXorKey();
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@ -94,11 +99,6 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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}
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}
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}
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}
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using (var fileStream = new FileStream(module.FullyQualifiedName, FileMode.Open, FileAccess.Read, FileShare.Read)) {
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byte[] fileData = new byte[(int)fileStream.Length];
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fileStream.Read(fileData, 0, fileData.Length);
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var peImage = new PE.PeImage(fileData);
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var methodsDataReader = new BinaryReader(new MemoryStream(methodsData));
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var methodsDataReader = new BinaryReader(new MemoryStream(methodsData));
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int patchCount = methodsDataReader.ReadInt32();
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int patchCount = methodsDataReader.ReadInt32();
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int mode = methodsDataReader.ReadInt32();
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int mode = methodsDataReader.ReadInt32();
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@ -132,8 +132,7 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
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}
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}
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}
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}
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return fileData;
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return true;
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}
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}
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}
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void initXorKey() {
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void initXorKey() {
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186
de4dot.code/deobfuscators/dotNET_Reactor/StringDecrypter.cs
Normal file
186
de4dot.code/deobfuscators/dotNET_Reactor/StringDecrypter.cs
Normal file
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@ -0,0 +1,186 @@
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/*
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Copyright (C) 2011 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
|
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the Free Software Foundation, either version 3 of the License, or
|
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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|
GNU General Public License for more details.
|
||||||
|
|
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You should have received a copy of the GNU General Public License
|
||||||
|
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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|
*/
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|
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using System;
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using System.Text;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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namespace de4dot.deobfuscators.dotNET_Reactor {
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class StringDecrypter {
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ModuleDefinition module;
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EncryptedResource encryptedResource;
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List<DecrypterInfo> decrypterInfos = new List<DecrypterInfo>();
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byte[] decryptedData;
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PE.PeImage peImage;
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|
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public class DecrypterInfo {
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public MethodDefinition method;
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public byte[] key;
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public byte[] iv;
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public DecrypterInfo(MethodDefinition method, byte[] key, byte[] iv) {
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this.method = method;
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this.key = key;
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this.iv = iv;
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}
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}
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public bool Detected {
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get { return encryptedResource.ResourceDecrypterMethod != null; }
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}
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public IEnumerable<DecrypterInfo> DecrypterInfos {
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get { return decrypterInfos; }
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}
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||||||
|
|
||||||
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public StringDecrypter(ModuleDefinition module) {
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this.module = module;
|
||||||
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this.encryptedResource = new EncryptedResource(module);
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}
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|
|
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public StringDecrypter(ModuleDefinition module, StringDecrypter oldOne) {
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this.module = module;
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this.encryptedResource = new EncryptedResource(module, oldOne.encryptedResource);
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foreach (var oldInfo in oldOne.decrypterInfos) {
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var method = module.LookupToken(oldInfo.method.MetadataToken.ToInt32()) as MethodDefinition;
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if (method == null)
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throw new ApplicationException("Could not find string decrypter method");
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decrypterInfos.Add(new DecrypterInfo(method, oldInfo.key, oldInfo.iv));
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}
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}
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|
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public void find() {
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var additionalTypes = new string[] {
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"System.String",
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};
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EmbeddedResource stringsResource = null;
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||||||
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foreach (var type in module.Types) {
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if (type.BaseType == null || type.BaseType.FullName != "System.Object")
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continue;
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foreach (var method in type.Methods) {
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if (!method.IsStatic || !method.HasBody)
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continue;
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if (!DotNetUtils.isMethod(method, "System.String", "(System.Int32)"))
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continue;
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if (!encryptedResource.couldBeResourceDecrypter(method, additionalTypes))
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continue;
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|
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var resource = DotNetUtils.getResource(module, DotNetUtils.getCodeStrings(method)) as EmbeddedResource;
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if (resource == null)
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throw new ApplicationException("Could not find strings resource");
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||||||
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if (stringsResource != null && stringsResource != resource)
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throw new ApplicationException("Two different string resources found");
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|
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stringsResource = resource;
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encryptedResource.ResourceDecrypterMethod = method;
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decrypterInfos.Add(new DecrypterInfo(method, null, null));
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|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public void init(PE.PeImage peImage, ISimpleDeobfuscator simpleDeobfuscator) {
|
||||||
|
if (encryptedResource.ResourceDecrypterMethod == null)
|
||||||
|
return;
|
||||||
|
this.peImage = peImage;
|
||||||
|
|
||||||
|
foreach (var info in decrypterInfos)
|
||||||
|
findKeyIv(info.method, out info.key, out info.iv);
|
||||||
|
|
||||||
|
encryptedResource.init(simpleDeobfuscator);
|
||||||
|
decryptedData = encryptedResource.decrypt();
|
||||||
|
}
|
||||||
|
|
||||||
|
void findKeyIv(MethodDefinition method, out byte[] key, out byte[] iv) {
|
||||||
|
key = null;
|
||||||
|
iv = null;
|
||||||
|
|
||||||
|
var requiredTypes = new string[] {
|
||||||
|
"System.Byte[]",
|
||||||
|
"System.IO.MemoryStream",
|
||||||
|
"System.Security.Cryptography.CryptoStream",
|
||||||
|
"System.Security.Cryptography.Rijndael",
|
||||||
|
};
|
||||||
|
foreach (var info in DotNetUtils.getCalledMethods(module, method)) {
|
||||||
|
var calledMethod = info.Item2;
|
||||||
|
if (calledMethod.DeclaringType != method.DeclaringType)
|
||||||
|
continue;
|
||||||
|
var localTypes = new LocalTypes(calledMethod);
|
||||||
|
if (!localTypes.all(requiredTypes))
|
||||||
|
continue;
|
||||||
|
|
||||||
|
var instructions = calledMethod.Body.Instructions;
|
||||||
|
byte[] newKey = null, newIv = null;
|
||||||
|
for (int i = 0; i < instructions.Count && (newKey == null || newIv == null); i++) {
|
||||||
|
var instr = instructions[i];
|
||||||
|
if (instr.OpCode.Code != Code.Ldtoken)
|
||||||
|
continue;
|
||||||
|
var field = instr.Operand as FieldDefinition;
|
||||||
|
if (field == null)
|
||||||
|
continue;
|
||||||
|
if (field.InitialValue == null)
|
||||||
|
continue;
|
||||||
|
if (field.InitialValue.Length == 32)
|
||||||
|
newKey = field.InitialValue;
|
||||||
|
else if (field.InitialValue.Length == 16)
|
||||||
|
newIv = field.InitialValue;
|
||||||
|
}
|
||||||
|
if (newKey == null || newIv == null)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
key = newKey;
|
||||||
|
iv = newIv;
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
DecrypterInfo getDecrypterInfo(MethodDefinition method) {
|
||||||
|
foreach (var info in decrypterInfos) {
|
||||||
|
if (info.method == method)
|
||||||
|
return info;
|
||||||
|
}
|
||||||
|
throw new ApplicationException("Invalid string decrypter method");
|
||||||
|
}
|
||||||
|
|
||||||
|
public string decrypt(MethodDefinition method, int offset) {
|
||||||
|
var info = getDecrypterInfo(method);
|
||||||
|
|
||||||
|
if (info.key == null) {
|
||||||
|
int length = BitConverter.ToInt32(decryptedData, offset);
|
||||||
|
return Encoding.Unicode.GetString(decryptedData, offset + 4, length);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
uint rva = BitConverter.ToUInt32(decryptedData, offset);
|
||||||
|
int length = peImage.readInt32(rva);
|
||||||
|
var encryptedStringData = peImage.readBytes(rva + 4, length);
|
||||||
|
byte[] decryptedStringData;
|
||||||
|
using (var aes = new RijndaelManaged()) {
|
||||||
|
aes.Mode = CipherMode.CBC;
|
||||||
|
using (var transform = aes.CreateDecryptor(info.key, info.iv)) {
|
||||||
|
decryptedStringData = transform.TransformFinalBlock(encryptedStringData, 0, encryptedStringData.Length);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return Encoding.Unicode.GetString(decryptedStringData, 0, decryptedStringData.Length);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in New Issue
Block a user