767 lines
22 KiB
C#
767 lines
22 KiB
C#
/*
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Copyright (C) 2011-2012 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
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using dot10.DotNet;
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using dot10.DotNet.Emit;
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using dot10.DotNet.Writer;
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using dot10.PE;
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using de4dot.blocks;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators {
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abstract class DeobfuscatorBase : IDeobfuscator, IModuleWriterListener {
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public const string DEFAULT_VALID_NAME_REGEX = @"^[a-zA-Z_<{$][a-zA-Z_0-9<>{}$.`-]*$";
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class RemoveInfo<T> {
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public T obj;
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public string reason;
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public RemoveInfo(T obj, string reason) {
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this.obj = obj;
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this.reason = reason;
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}
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}
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OptionsBase optionsBase;
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protected ModuleDefMD module;
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protected StaticStringInliner staticStringInliner = new StaticStringInliner();
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IList<RemoveInfo<TypeDef>> typesToRemove = new List<RemoveInfo<TypeDef>>();
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IList<RemoveInfo<MethodDef>> methodsToRemove = new List<RemoveInfo<MethodDef>>();
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IList<RemoveInfo<FieldDef>> fieldsToRemove = new List<RemoveInfo<FieldDef>>();
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IList<RemoveInfo<TypeDef>> attrsToRemove = new List<RemoveInfo<TypeDef>>();
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IList<RemoveInfo<Resource>> resourcesToRemove = new List<RemoveInfo<Resource>>();
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List<string> namesToPossiblyRemove = new List<string>();
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MethodCallRemover methodCallRemover = new MethodCallRemover();
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byte[] moduleBytes;
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protected InitializedDataCreator initializedDataCreator;
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protected byte[] ModuleBytes {
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get { return moduleBytes; }
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set { moduleBytes = value; }
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}
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internal class OptionsBase : IDeobfuscatorOptions {
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public bool RenameResourcesInCode { get; set; }
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public NameRegexes ValidNameRegex { get; set; }
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public bool DecryptStrings { get; set; }
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public OptionsBase() {
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RenameResourcesInCode = true;
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}
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}
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public IDeobfuscatorOptions TheOptions {
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get { return optionsBase; }
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}
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public IOperations Operations { get; set; }
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public IDeobfuscatedFile DeobfuscatedFile { get; set; }
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public virtual StringFeatures StringFeatures { get; set; }
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public virtual RenamingOptions RenamingOptions { get; set; }
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public DecrypterType DefaultDecrypterType { get; set; }
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public abstract string Type { get; }
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public abstract string TypeLong { get; }
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public abstract string Name { get; }
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protected virtual bool CanInlineMethods {
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get { return false; }
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}
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protected virtual bool KeepTypes {
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get { return false; }
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}
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protected bool CanRemoveStringDecrypterType {
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get { return Operations.DecryptStrings != OpDecryptString.None && staticStringInliner.InlinedAllCalls; }
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}
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public virtual IEnumerable<IBlocksDeobfuscator> BlocksDeobfuscators {
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get {
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var list = new List<IBlocksDeobfuscator>();
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if (CanInlineMethods)
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list.Add(new MethodCallInliner(false));
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return list;
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}
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}
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public DeobfuscatorBase(OptionsBase optionsBase) {
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this.optionsBase = optionsBase;
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StringFeatures = StringFeatures.AllowAll;
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DefaultDecrypterType = DecrypterType.Static;
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}
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public virtual byte[] unpackNativeFile(PEImage peImage) {
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return null;
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}
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public virtual void init(ModuleDefMD module) {
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setModule(module);
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}
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protected void setModule(ModuleDefMD module) {
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this.module = module;
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initializedDataCreator = new InitializedDataCreator(module);
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}
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protected virtual bool checkValidName(string name) {
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return optionsBase.ValidNameRegex.isMatch(name);
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}
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public virtual int detect() {
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scanForObfuscator();
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return detectInternal();
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}
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protected abstract void scanForObfuscator();
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protected abstract int detectInternal();
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public virtual bool getDecryptedModule(int count, ref byte[] newFileData, ref DumpedMethods dumpedMethods) {
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return false;
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}
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public virtual IDeobfuscator moduleReloaded(ModuleDefMD module) {
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throw new ApplicationException("moduleReloaded() must be overridden by the deobfuscator");
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}
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public virtual void deobfuscateBegin() {
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ModuleBytes = null;
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}
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public virtual void deobfuscateMethodBegin(Blocks blocks) {
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}
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public virtual void deobfuscateMethodEnd(Blocks blocks) {
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removeMethodCalls(blocks);
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}
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public virtual void deobfuscateStrings(Blocks blocks) {
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staticStringInliner.decrypt(blocks);
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}
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public virtual bool deobfuscateOther(Blocks blocks) {
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return false;
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}
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public virtual void deobfuscateEnd() {
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if (!Operations.KeepObfuscatorTypes && !KeepTypes) {
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removeTypesWithInvalidBaseTypes();
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deleteEmptyCctors();
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deleteMethods();
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deleteFields();
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deleteCustomAttributes();
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deleteOtherAttributes();
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deleteTypes();
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deleteDllResources();
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}
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restoreBaseType();
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}
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static bool isTypeWithInvalidBaseType(TypeDef moduleType, TypeDef type) {
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return type.BaseType == null && !type.IsInterface && type != moduleType;
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}
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void restoreBaseType() {
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var moduleType = DotNetUtils.getModuleType(module);
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foreach (var type in module.GetTypes()) {
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if (!isTypeWithInvalidBaseType(moduleType, type))
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continue;
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Log.v("Adding System.Object as base type: {0} ({1:X8})",
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Utils.removeNewlines(type),
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type.MDToken.ToInt32());
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type.BaseType = module.CorLibTypes.Object.TypeDefOrRef;
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}
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}
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void removeTypesWithInvalidBaseTypes() {
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var moduleType = DotNetUtils.getModuleType(module);
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foreach (var type in module.GetTypes()) {
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if (!isTypeWithInvalidBaseType(moduleType, type))
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continue;
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addTypeToBeRemoved(type, "Invalid type with no base type (anti-reflection)");
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}
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}
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protected void fixEnumTypes() {
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foreach (var type in module.GetTypes()) {
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if (!type.IsEnum)
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continue;
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foreach (var field in type.Fields) {
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if (field.IsStatic)
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continue;
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field.IsRTSpecialName = true;
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field.IsSpecialName = true;
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}
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}
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}
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protected void fixInterfaces() {
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foreach (var type in module.GetTypes()) {
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if (!type.IsInterface)
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continue;
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type.IsSealed = false;
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}
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}
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public abstract IEnumerable<int> getStringDecrypterMethods();
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class MethodCallRemover {
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Dictionary<string, MethodDefinitionAndDeclaringTypeDict<bool>> methodNameInfos = new Dictionary<string, MethodDefinitionAndDeclaringTypeDict<bool>>();
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MethodDefinitionAndDeclaringTypeDict<MethodDefinitionAndDeclaringTypeDict<bool>> methodRefInfos = new MethodDefinitionAndDeclaringTypeDict<MethodDefinitionAndDeclaringTypeDict<bool>>();
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void checkMethod(IMethod methodToBeRemoved) {
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var sig = methodToBeRemoved.MethodSig;
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if (sig.Params.Count != 0)
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throw new ApplicationException(string.Format("Method takes params: {0}", methodToBeRemoved));
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if (sig.RetType.ElementType != ElementType.Void)
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throw new ApplicationException(string.Format("Method has a return value: {0}", methodToBeRemoved));
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}
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public void add(string method, MethodDef methodToBeRemoved) {
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if (methodToBeRemoved == null)
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return;
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checkMethod(methodToBeRemoved);
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MethodDefinitionAndDeclaringTypeDict<bool> dict;
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if (!methodNameInfos.TryGetValue(method, out dict))
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methodNameInfos[method] = dict = new MethodDefinitionAndDeclaringTypeDict<bool>();
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dict.add(methodToBeRemoved, true);
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}
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public void add(MethodDef method, MethodDef methodToBeRemoved) {
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if (method == null || methodToBeRemoved == null)
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return;
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checkMethod(methodToBeRemoved);
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var dict = methodRefInfos.find(method);
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if (dict == null)
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methodRefInfos.add(method, dict = new MethodDefinitionAndDeclaringTypeDict<bool>());
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dict.add(methodToBeRemoved, true);
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}
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public void removeAll(Blocks blocks) {
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var allBlocks = blocks.MethodBlocks.getAllBlocks();
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removeAll(allBlocks, blocks, blocks.Method.Name.String);
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removeAll(allBlocks, blocks, blocks.Method);
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}
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void removeAll(IList<Block> allBlocks, Blocks blocks, string method) {
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MethodDefinitionAndDeclaringTypeDict<bool> info;
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if (!methodNameInfos.TryGetValue(method, out info))
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return;
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removeCalls(allBlocks, blocks, info);
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}
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void removeAll(IList<Block> allBlocks, Blocks blocks, MethodDef method) {
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var info = methodRefInfos.find(method);
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if (info == null)
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return;
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removeCalls(allBlocks, blocks, info);
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}
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void removeCalls(IList<Block> allBlocks, Blocks blocks, MethodDefinitionAndDeclaringTypeDict<bool> info) {
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var instrsToDelete = new List<int>();
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foreach (var block in allBlocks) {
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instrsToDelete.Clear();
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for (int i = 0; i < block.Instructions.Count; i++) {
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var instr = block.Instructions[i];
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if (instr.OpCode != OpCodes.Call)
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continue;
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var destMethod = instr.Operand as IMethod;
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if (destMethod == null)
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continue;
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if (info.find(destMethod)) {
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Log.v("Removed call to {0}", Utils.removeNewlines(destMethod));
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instrsToDelete.Add(i);
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}
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}
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block.remove(instrsToDelete);
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}
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}
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}
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public void addCctorInitCallToBeRemoved(MethodDef methodToBeRemoved) {
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methodCallRemover.add(".cctor", methodToBeRemoved);
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}
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public void addModuleCctorInitCallToBeRemoved(MethodDef methodToBeRemoved) {
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methodCallRemover.add(DotNetUtils.getModuleTypeCctor(module), methodToBeRemoved);
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}
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public void addCtorInitCallToBeRemoved(MethodDef methodToBeRemoved) {
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methodCallRemover.add(".ctor", methodToBeRemoved);
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}
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public void addCallToBeRemoved(MethodDef method, MethodDef methodToBeRemoved) {
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methodCallRemover.add(method, methodToBeRemoved);
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}
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void removeMethodCalls(Blocks blocks) {
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methodCallRemover.removeAll(blocks);
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}
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protected void addMethodsToBeRemoved(IEnumerable<MethodDef> methods, string reason) {
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foreach (var method in methods)
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addMethodToBeRemoved(method, reason);
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}
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protected void addMethodToBeRemoved(MethodDef method, string reason) {
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if (method != null)
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methodsToRemove.Add(new RemoveInfo<MethodDef>(method, reason));
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}
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protected void addFieldsToBeRemoved(IEnumerable<FieldDef> fields, string reason) {
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foreach (var field in fields)
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addFieldToBeRemoved(field, reason);
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}
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protected void addFieldToBeRemoved(FieldDef field, string reason) {
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if (field != null)
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fieldsToRemove.Add(new RemoveInfo<FieldDef>(field, reason));
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}
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protected void addAttributesToBeRemoved(IEnumerable<TypeDef> attrs, string reason) {
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foreach (var attr in attrs)
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addAttributeToBeRemoved(attr, reason);
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}
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protected void addAttributeToBeRemoved(TypeDef attr, string reason) {
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if (attr == null)
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return;
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addTypeToBeRemoved(attr, reason);
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attrsToRemove.Add(new RemoveInfo<TypeDef>(attr, reason));
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}
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protected void addTypesToBeRemoved(IEnumerable<TypeDef> types, string reason) {
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foreach (var type in types)
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addTypeToBeRemoved(type, reason);
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}
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protected void addTypeToBeRemoved(TypeDef type, string reason) {
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if (type != null)
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typesToRemove.Add(new RemoveInfo<TypeDef>(type, reason));
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}
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protected void addResourceToBeRemoved(Resource resource, string reason) {
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if (resource != null)
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resourcesToRemove.Add(new RemoveInfo<Resource>(resource, reason));
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}
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void deleteEmptyCctors() {
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var emptyCctorsToRemove = new List<MethodDef>();
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foreach (var type in module.GetTypes()) {
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var cctor = type.FindClassConstructor();
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if (cctor != null && DotNetUtils.isEmpty(cctor))
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emptyCctorsToRemove.Add(cctor);
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}
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if (emptyCctorsToRemove.Count == 0)
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return;
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Log.v("Removing empty .cctor methods");
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Log.indent();
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foreach (var cctor in emptyCctorsToRemove) {
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var type = cctor.DeclaringType;
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if (type == null)
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continue;
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if (type.Methods.Remove(cctor))
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Log.v("{0:X8}, type: {1} ({2:X8})",
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cctor.MDToken.ToUInt32(),
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Utils.removeNewlines(type),
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type.MDToken.ToUInt32());
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}
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Log.deIndent();
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}
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void deleteMethods() {
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if (methodsToRemove.Count == 0)
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return;
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Log.v("Removing methods");
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Log.indent();
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foreach (var info in methodsToRemove) {
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var method = info.obj;
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if (method == null)
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continue;
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var type = method.DeclaringType;
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if (type == null)
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continue;
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if (type.Methods.Remove(method))
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Log.v("Removed method {0} ({1:X8}) (Type: {2}) (reason: {3})",
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Utils.removeNewlines(method),
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method.MDToken.ToUInt32(),
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Utils.removeNewlines(type),
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info.reason);
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}
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Log.deIndent();
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}
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void deleteFields() {
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if (fieldsToRemove.Count == 0)
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return;
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Log.v("Removing fields");
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Log.indent();
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foreach (var info in fieldsToRemove) {
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var field = info.obj;
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if (field == null)
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continue;
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var type = field.DeclaringType;
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if (type == null)
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continue;
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if (type.Fields.Remove(field))
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Log.v("Removed field {0} ({1:X8}) (Type: {2}) (reason: {3})",
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Utils.removeNewlines(field),
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field.MDToken.ToUInt32(),
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Utils.removeNewlines(type),
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info.reason);
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}
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Log.deIndent();
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}
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void deleteTypes() {
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var types = module.Types;
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if (types == null || typesToRemove.Count == 0)
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return;
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Log.v("Removing types");
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Log.indent();
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var moduleType = DotNetUtils.getModuleType(module);
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foreach (var info in typesToRemove) {
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var typeDef = info.obj;
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if (typeDef == null || typeDef == moduleType)
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continue;
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bool removed;
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if (typeDef.DeclaringType != null)
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removed = typeDef.DeclaringType.NestedTypes.Remove(typeDef);
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else
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removed = types.Remove(typeDef);
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if (removed)
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Log.v("Removed type {0} ({1:X8}) (reason: {2})",
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Utils.removeNewlines(typeDef),
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typeDef.MDToken.ToUInt32(),
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info.reason);
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}
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Log.deIndent();
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}
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void deleteCustomAttributes() {
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if (attrsToRemove.Count == 0)
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return;
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Log.v("Removing custom attributes");
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Log.indent();
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deleteCustomAttributes(module.CustomAttributes);
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if (module.Assembly != null)
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deleteCustomAttributes(module.Assembly.CustomAttributes);
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Log.deIndent();
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}
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void deleteCustomAttributes(IList<CustomAttribute> customAttrs) {
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if (customAttrs == null)
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return;
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foreach (var info in attrsToRemove) {
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var typeDef = info.obj;
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if (typeDef == null)
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continue;
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for (int i = 0; i < customAttrs.Count; i++) {
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if (new SigComparer().Equals(typeDef, customAttrs[i].AttributeType)) {
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customAttrs.RemoveAt(i);
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i--;
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Log.v("Removed custom attribute {0} ({1:X8}) (reason: {2})",
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Utils.removeNewlines(typeDef),
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typeDef.MDToken.ToUInt32(),
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info.reason);
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break;
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}
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}
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}
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}
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void deleteOtherAttributes() {
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Log.v("Removing other attributes");
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Log.indent();
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deleteOtherAttributes(module.CustomAttributes);
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if (module.Assembly != null)
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deleteOtherAttributes(module.Assembly.CustomAttributes);
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Log.deIndent();
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}
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void deleteOtherAttributes(IList<CustomAttribute> customAttributes) {
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for (int i = customAttributes.Count - 1; i >= 0; i--) {
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var attr = customAttributes[i].TypeFullName;
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if (attr == "System.Runtime.CompilerServices.SuppressIldasmAttribute") {
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Log.v("Removed attribute {0}", Utils.removeNewlines(attr));
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customAttributes.RemoveAt(i);
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}
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}
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}
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void deleteDllResources() {
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if (!module.HasResources || resourcesToRemove.Count == 0)
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return;
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Log.v("Removing resources");
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Log.indent();
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foreach (var info in resourcesToRemove) {
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var resource = info.obj;
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if (resource == null)
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continue;
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if (module.Resources.Remove(resource))
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Log.v("Removed resource {0} (reason: {1})", Utils.toCsharpString(resource.Name), info.reason);
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}
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Log.deIndent();
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}
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|
|
protected void setInitLocals() {
|
|
foreach (var type in module.GetTypes()) {
|
|
foreach (var method in type.Methods) {
|
|
if (isFatHeader(method))
|
|
method.Body.InitLocals = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool isFatHeader(MethodDef method) {
|
|
if (method == null || method.Body == null)
|
|
return false;
|
|
var body = method.Body;
|
|
if (body.InitLocals || body.MaxStack > 8)
|
|
return true;
|
|
if (body.LocalList.Count > 0)
|
|
return true;
|
|
if (body.ExceptionHandlers.Count > 0)
|
|
return true;
|
|
if (getCodeSize(method) > 63)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int getCodeSize(MethodDef method) {
|
|
if (method == null || method.Body == null)
|
|
return 0;
|
|
int size = 0;
|
|
foreach (var instr in method.Body.Instructions)
|
|
size += instr.GetSize();
|
|
return size;
|
|
}
|
|
|
|
public override string ToString() {
|
|
return Name;
|
|
}
|
|
|
|
protected void findPossibleNamesToRemove(MethodDef method) {
|
|
if (method == null || !method.HasBody)
|
|
return;
|
|
|
|
foreach (var instr in method.Body.Instructions) {
|
|
if (instr.OpCode == OpCodes.Ldstr)
|
|
namesToPossiblyRemove.Add((string)instr.Operand);
|
|
}
|
|
}
|
|
|
|
protected void addResources(string reason) {
|
|
if (!module.HasResources)
|
|
return;
|
|
|
|
foreach (var name in namesToPossiblyRemove) {
|
|
foreach (var resource in module.Resources) {
|
|
if (resource.Name == name) {
|
|
addResourceToBeRemoved(resource, reason);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected bool removeProxyDelegates(ProxyCallFixerBase proxyCallFixer) {
|
|
return removeProxyDelegates(proxyCallFixer, true);
|
|
}
|
|
|
|
protected bool removeProxyDelegates(ProxyCallFixerBase proxyCallFixer, bool removeCreators) {
|
|
if (proxyCallFixer.Errors != 0) {
|
|
Log.v("Not removing proxy delegates and creator type since errors were detected.");
|
|
return false;
|
|
}
|
|
addTypesToBeRemoved(proxyCallFixer.DelegateTypes, "Proxy delegate type");
|
|
if (removeCreators && proxyCallFixer.RemovedDelegateCreatorCalls > 0) {
|
|
addTypesToBeRemoved(proxyCallFixer.DelegateCreatorTypes, "Proxy delegate creator type");
|
|
foreach (var tuple in proxyCallFixer.OtherMethods)
|
|
addMethodToBeRemoved(tuple.Item1, tuple.Item2);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
protected Resource getResource(IEnumerable<string> strings) {
|
|
return DotNetUtils.getResource(module, strings);
|
|
}
|
|
|
|
protected CustomAttribute getAssemblyAttribute(IType attr) {
|
|
if (module.Assembly == null)
|
|
return null;
|
|
return module.Assembly.CustomAttributes.Find(attr);
|
|
}
|
|
|
|
protected CustomAttribute getModuleAttribute(IType attr) {
|
|
return module.CustomAttributes.Find(attr);
|
|
}
|
|
|
|
protected bool hasMetadataStream(string name) {
|
|
foreach (var stream in module.MetaData.AllStreams) {
|
|
if (stream.Name == name)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
List<T> getObjectsToRemove<T>(IList<RemoveInfo<T>> removeThese) where T : class, ICodedToken {
|
|
var list = new List<T>(removeThese.Count);
|
|
foreach (var info in removeThese) {
|
|
if (info.obj != null)
|
|
list.Add(info.obj);
|
|
}
|
|
return list;
|
|
}
|
|
|
|
protected List<TypeDef> getTypesToRemove() {
|
|
return getObjectsToRemove(typesToRemove);
|
|
}
|
|
|
|
protected List<MethodDef> getMethodsToRemove() {
|
|
return getObjectsToRemove(methodsToRemove);
|
|
}
|
|
|
|
public virtual bool isValidNamespaceName(string ns) {
|
|
if (ns == null)
|
|
return false;
|
|
foreach (var part in ns.Split(new char[] { '.' })) {
|
|
if (!checkValidName(part))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
public virtual bool isValidTypeName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidMethodName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidPropertyName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidEventName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidFieldName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidGenericParamName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidMethodArgName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidMethodReturnArgName(string name) {
|
|
return string.IsNullOrEmpty(name) || checkValidName(name);
|
|
}
|
|
|
|
public virtual bool isValidResourceKeyName(string name) {
|
|
return name != null && checkValidName(name);
|
|
}
|
|
|
|
public virtual void OnWriterEvent(ModuleWriter writer, ModuleWriterEvent evt) {
|
|
}
|
|
|
|
protected void findAndRemoveInlinedMethods() {
|
|
removeInlinedMethods(InlinedMethodsFinder.find(module));
|
|
}
|
|
|
|
protected void removeInlinedMethods(List<MethodDef> inlinedMethods) {
|
|
addMethodsToBeRemoved(new UnusedMethodsFinder(module, inlinedMethods, getRemovedMethods()).find(), "Inlined method");
|
|
}
|
|
|
|
protected MethodCollection getRemovedMethods() {
|
|
var removedMethods = new MethodCollection();
|
|
removedMethods.add(getMethodsToRemove());
|
|
removedMethods.addAndNested(getTypesToRemove());
|
|
return removedMethods;
|
|
}
|
|
|
|
protected bool isTypeCalled(TypeDef decrypterType) {
|
|
if (decrypterType == null)
|
|
return false;
|
|
|
|
var decrypterMethods = new MethodCollection();
|
|
decrypterMethods.addAndNested(decrypterType);
|
|
|
|
var removedMethods = getRemovedMethods();
|
|
|
|
foreach (var type in module.GetTypes()) {
|
|
foreach (var method in type.Methods) {
|
|
if (method.Body == null)
|
|
continue;
|
|
if (decrypterMethods.exists(method))
|
|
break; // decrypter type / nested type method
|
|
if (removedMethods.exists(method))
|
|
continue;
|
|
|
|
foreach (var instr in method.Body.Instructions) {
|
|
switch (instr.OpCode.Code) {
|
|
case Code.Call:
|
|
case Code.Callvirt:
|
|
case Code.Newobj:
|
|
var calledMethod = instr.Operand as IMethod;
|
|
if (calledMethod == null)
|
|
break;
|
|
if (decrypterMethods.exists(calledMethod))
|
|
return true;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
protected static int toInt32(bool b) {
|
|
return b ? 1 : 0;
|
|
}
|
|
}
|
|
}
|