760 lines
22 KiB
C#
760 lines
22 KiB
C#
/*
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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
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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.Collections.Generic;
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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 {
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// Restore the type of all fields / parameters that have had their type turned into object.
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// This thing requires a lot more code than I have time to do now (similar to symbol renaming)
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// so it will be a basic implementation only.
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class TypesRestorer {
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ModuleDefinition module;
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List<MethodDefinition> allMethods;
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Dictionary<ParameterDefinition, TypeInfo<ParameterDefinition>> argInfos = new Dictionary<ParameterDefinition, TypeInfo<ParameterDefinition>>();
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TypeInfo<ParameterDefinition> methodReturnInfo;
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Dictionary<FieldReferenceAndDeclaringTypeKey, TypeInfo<FieldDefinition>> fieldWrites = new Dictionary<FieldReferenceAndDeclaringTypeKey, TypeInfo<FieldDefinition>>();
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Dictionary<int, UpdatedMethod> updatedMethods = new Dictionary<int, UpdatedMethod>();
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Dictionary<int, UpdatedField> updatedFields = new Dictionary<int, UpdatedField>();
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class UpdatedMethod {
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public int token;
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public TypeReference[] newArgTypes;
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public TypeReference newReturnType;
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public UpdatedMethod(MethodDefinition method) {
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token = method.MetadataToken.ToInt32();
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newArgTypes = new TypeReference[DotNetUtils.getArgsCount(method)];
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}
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}
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class UpdatedField {
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public int token;
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public TypeReference newFieldType;
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public UpdatedField(FieldDefinition field) {
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token = field.MetadataToken.ToInt32();
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}
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}
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class TypeInfo<T> {
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Dictionary<TypeReferenceKey, bool> types = new Dictionary<TypeReferenceKey, bool>();
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public TypeReference newType = null;
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public T arg;
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bool newobjTypes;
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public Dictionary<TypeReferenceKey, bool> Types {
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get { return types; }
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}
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public TypeInfo(T arg) {
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this.arg = arg;
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}
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public void add(TypeReference type, bool wasNewobj = false) {
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if (wasNewobj) {
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if (!newobjTypes)
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clear();
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newobjTypes = true;
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}
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else if (newobjTypes)
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return;
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types[new TypeReferenceKey(type)] = true;
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}
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public void clear() {
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types.Clear();
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}
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public bool updateNewType(ModuleDefinition module) {
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if (types.Count == 0)
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return false;
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TypeReference theNewType = null;
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foreach (var key in types.Keys) {
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if (theNewType == null) {
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theNewType = key.TypeReference;
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continue;
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}
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theNewType = getCommonBaseClass(module, theNewType, key.TypeReference);
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if (theNewType == null)
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break;
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}
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if (theNewType == null)
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return false;
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if (MemberReferenceHelper.compareTypes(theNewType, newType))
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return false;
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newType = theNewType;
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return true;
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}
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}
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public TypesRestorer(ModuleDefinition module) {
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this.module = module;
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}
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UpdatedMethod getUpdatedMethod(MethodDefinition method) {
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int token = method.MetadataToken.ToInt32();
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UpdatedMethod updatedMethod;
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if (updatedMethods.TryGetValue(token, out updatedMethod))
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return updatedMethod;
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return updatedMethods[token] = new UpdatedMethod(method);
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}
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UpdatedField getUpdatedField(FieldDefinition field) {
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int token = field.MetadataToken.ToInt32();
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UpdatedField updatedField;
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if (updatedFields.TryGetValue(token, out updatedField))
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return updatedField;
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return updatedFields[token] = new UpdatedField(field);
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}
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public void deobfuscate() {
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allMethods = new List<MethodDefinition>();
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foreach (var type in module.GetTypes())
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allMethods.AddRange(type.Methods);
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foreach (var type in module.GetTypes()) {
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foreach (var field in type.Fields) {
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if (!MemberReferenceHelper.isSystemObject(field.FieldType))
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continue;
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var key = new FieldReferenceAndDeclaringTypeKey(field);
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fieldWrites[key] = new TypeInfo<FieldDefinition>(field);
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}
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}
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for (int i = 0; i < 10; i++) {
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bool changed = false;
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changed |= deobfuscateFields();
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changed |= deobfuscateMethods();
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if (!changed)
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break;
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}
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var fields = new List<UpdatedField>(updatedFields.Values);
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if (fields.Count > 0) {
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Log.v("Changing field types from object -> real type");
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fields.Sort((a, b) => Utils.compareInt32(a.token, b.token));
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Log.indent();
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foreach (var updatedField in fields)
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Log.v("Field {0:X8}: type {1} ({2:X8})", updatedField.token, updatedField.newFieldType.FullName, updatedField.newFieldType.MetadataToken.ToInt32());
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Log.deIndent();
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}
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var methods = new List<UpdatedMethod>(updatedMethods.Values);
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if (methods.Count > 0) {
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Log.v("Changing method args and return types from object -> real type");
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methods.Sort((a, b) => Utils.compareInt32(a.token, b.token));
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Log.indent();
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foreach (var updatedMethod in methods) {
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Log.v("Method {0:X8}", updatedMethod.token);
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Log.indent();
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if (updatedMethod.newReturnType != null)
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Log.v("ret: {0} ({1:X8})", updatedMethod.newReturnType.FullName, updatedMethod.newReturnType.MetadataToken.ToInt32());
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for (int i = 0; i < updatedMethod.newArgTypes.Length; i++) {
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var updatedArg = updatedMethod.newArgTypes[i];
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if (updatedArg == null)
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continue;
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Log.v("arg {0}: {1} ({2:X8})", i, updatedArg.FullName, updatedArg.MetadataToken.ToInt32());
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}
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Log.deIndent();
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}
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Log.deIndent();
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}
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}
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bool deobfuscateMethods() {
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bool changed = false;
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foreach (var method in allMethods) {
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methodReturnInfo = new TypeInfo<ParameterDefinition>(method.MethodReturnType.Parameter2);
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deobfuscateMethod(method);
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if (methodReturnInfo.updateNewType(module)) {
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getUpdatedMethod(method).newReturnType = methodReturnInfo.newType;
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method.MethodReturnType.ReturnType = methodReturnInfo.newType;
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changed = true;
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}
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foreach (var info in argInfos.Values) {
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if (info.updateNewType(module)) {
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getUpdatedMethod(method).newArgTypes[DotNetUtils.getArgIndex(method, info.arg)] = info.newType;
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info.arg.ParameterType = info.newType;
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changed = true;
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}
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}
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}
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return changed;
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}
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static int sortTypeInfos(TypeInfo<ParameterDefinition> a, TypeInfo<ParameterDefinition> b) {
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if (a.arg.Method.MetadataToken.ToInt32() < b.arg.Method.MetadataToken.ToInt32()) return -1;
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if (a.arg.Method.MetadataToken.ToInt32() > b.arg.Method.MetadataToken.ToInt32()) return 1;
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return Utils.compareInt32(a.arg.Index, b.arg.Index);
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}
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class PushedArgs {
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List<Instruction> args;
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int nextIndex;
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public bool CanAddMore {
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get { return nextIndex >= 0; }
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}
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public int NumValidArgs {
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get { return args.Count - (nextIndex + 1); }
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}
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public PushedArgs(int numArgs) {
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nextIndex = numArgs - 1;
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args = new List<Instruction>(numArgs);
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for (int i = 0; i < numArgs; i++)
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args.Add(null);
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}
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public void add(Instruction instr) {
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args[nextIndex--] = instr;
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}
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public void set(int i, Instruction instr) {
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args[i] = instr;
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}
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public Instruction get(int i) {
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if (0 <= i && i < args.Count)
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return args[i];
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return null;
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}
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public Instruction getEnd(int i) {
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return get(args.Count - 1 - i);
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}
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public void fixDups() {
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Instruction prev = null, instr;
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for (int i = 0; i < NumValidArgs; i++, prev = instr) {
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instr = args[i];
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if (instr == null || prev == null)
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continue;
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if (instr.OpCode.Code != Code.Dup)
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continue;
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args[i] = prev;
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instr = prev;
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}
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}
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}
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void deobfuscateMethod(MethodDefinition method) {
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if (!method.IsStatic || method.Body == null)
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return;
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bool fixReturnType = MemberReferenceHelper.isSystemObject(method.MethodReturnType.ReturnType);
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argInfos.Clear();
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foreach (var arg in method.Parameters) {
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if (arg.ParameterType == null || arg.ParameterType.IsValueType)
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continue;
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if (!MemberReferenceHelper.isSystemObject(arg.ParameterType))
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continue;
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argInfos[arg] = new TypeInfo<ParameterDefinition>(arg);
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}
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if (argInfos.Count == 0 && !fixReturnType)
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return;
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var methodParams = DotNetUtils.getParameters(method);
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PushedArgs pushedArgs;
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var instructions = method.Body.Instructions;
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for (int i = 0; i < instructions.Count; i++) {
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var instr = instructions[i];
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switch (instr.OpCode.Code) {
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case Code.Ret:
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if (!fixReturnType)
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break;
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bool wasNewobj;
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var type = getLoadedType(method, instructions, i, out wasNewobj);
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if (type == null)
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break;
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methodReturnInfo.add(type);
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break;
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case Code.Call:
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case Code.Calli:
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case Code.Callvirt:
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case Code.Newobj:
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pushedArgs = getPushedArgInstructions(instructions, i);
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var calledMethod = instr.Operand as MethodReference;
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if (calledMethod == null)
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break;
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var calledMethodParams = DotNetUtils.getParameters(calledMethod);
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for (int j = 0; j < pushedArgs.NumValidArgs; j++) {
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int calledMethodParamIndex = calledMethodParams.Count - j - 1;
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var ldInstr = pushedArgs.getEnd(j);
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switch (ldInstr.OpCode.Code) {
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case Code.Ldarg:
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case Code.Ldarg_S:
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case Code.Ldarg_0:
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case Code.Ldarg_1:
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case Code.Ldarg_2:
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case Code.Ldarg_3:
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addMethodArgType(getParameter(methodParams, method, ldInstr), DotNetUtils.getParameter(calledMethodParams, calledMethodParamIndex));
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break;
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default:
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break;
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}
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}
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break;
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case Code.Castclass:
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pushedArgs = getPushedArgInstructions(instructions, i);
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if (pushedArgs.NumValidArgs < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, pushedArgs.getEnd(0)), instr.Operand as TypeReference);
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break;
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case Code.Stloc:
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case Code.Stloc_S:
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case Code.Stloc_0:
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case Code.Stloc_1:
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case Code.Stloc_2:
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case Code.Stloc_3:
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pushedArgs = getPushedArgInstructions(instructions, i);
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if (pushedArgs.NumValidArgs < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, pushedArgs.getEnd(0)), DotNetUtils.getLocalVar(method.Body.Variables, instr));
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break;
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case Code.Stsfld:
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pushedArgs = getPushedArgInstructions(instructions, i);
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if (pushedArgs.NumValidArgs < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, pushedArgs.getEnd(0)), instr.Operand as FieldReference);
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break;
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case Code.Stfld:
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pushedArgs = getPushedArgInstructions(instructions, i);
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if (pushedArgs.NumValidArgs >= 1) {
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var field = instr.Operand as FieldReference;
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addMethodArgType(getParameter(methodParams, method, pushedArgs.getEnd(0)), field);
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if (pushedArgs.NumValidArgs >= 2 && field != null)
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addMethodArgType(getParameter(methodParams, method, pushedArgs.getEnd(1)), field.DeclaringType);
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}
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break;
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case Code.Ldfld:
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case Code.Ldflda:
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pushedArgs = getPushedArgInstructions(instructions, i);
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if (pushedArgs.NumValidArgs < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, pushedArgs.getEnd(0)), instr.Operand as FieldReference);
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break;
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//TODO: For better results, these should be checked:
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case Code.Starg:
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case Code.Starg_S:
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case Code.Ldelema:
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case Code.Ldelem_Any:
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case Code.Ldelem_I:
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case Code.Ldelem_I1:
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case Code.Ldelem_I2:
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case Code.Ldelem_I4:
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case Code.Ldelem_I8:
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case Code.Ldelem_R4:
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case Code.Ldelem_R8:
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case Code.Ldelem_Ref:
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case Code.Ldelem_U1:
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case Code.Ldelem_U2:
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case Code.Ldelem_U4:
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case Code.Ldind_I:
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case Code.Ldind_I1:
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case Code.Ldind_I2:
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case Code.Ldind_I4:
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case Code.Ldind_I8:
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case Code.Ldind_R4:
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case Code.Ldind_R8:
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case Code.Ldind_Ref:
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case Code.Ldind_U1:
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case Code.Ldind_U2:
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case Code.Ldind_U4:
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case Code.Ldobj:
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case Code.Stelem_Any:
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case Code.Stelem_I:
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case Code.Stelem_I1:
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case Code.Stelem_I2:
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case Code.Stelem_I4:
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case Code.Stelem_I8:
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case Code.Stelem_R4:
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case Code.Stelem_R8:
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case Code.Stelem_Ref:
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case Code.Stind_I:
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case Code.Stind_I1:
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case Code.Stind_I2:
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case Code.Stind_I4:
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case Code.Stind_I8:
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case Code.Stind_R4:
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case Code.Stind_R8:
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case Code.Stind_Ref:
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case Code.Stobj:
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default:
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break;
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}
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}
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}
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static ParameterDefinition getParameter(IList<ParameterDefinition> parameters, MethodReference method, Instruction instr) {
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switch (instr.OpCode.Code) {
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case Code.Ldarg:
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case Code.Ldarg_S:
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case Code.Ldarg_0:
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case Code.Ldarg_1:
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case Code.Ldarg_2:
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case Code.Ldarg_3:
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return DotNetUtils.getParameter(parameters, method, instr);
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default:
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return null;
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}
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}
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bool addMethodArgType(ParameterDefinition methodParam, FieldReference field) {
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if (field == null)
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return false;
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return addMethodArgType(methodParam, field.FieldType);
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}
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bool addMethodArgType(ParameterDefinition methodParam, VariableDefinition otherLocal) {
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if (otherLocal == null)
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return false;
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return addMethodArgType(methodParam, otherLocal.VariableType);
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}
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bool addMethodArgType(ParameterDefinition methodParam, ParameterDefinition otherParam) {
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if (otherParam == null)
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return false;
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return addMethodArgType(methodParam, otherParam.ParameterType);
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}
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bool addMethodArgType(ParameterDefinition methodParam, TypeReference type) {
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if (methodParam == null || type == null)
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return false;
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if (!isValidType(type))
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return false;
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TypeInfo<ParameterDefinition> info;
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if (!argInfos.TryGetValue(methodParam, out info))
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return false;
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if (info.Types.ContainsKey(new TypeReferenceKey(type)))
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return false;
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info.add(type);
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return true;
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}
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// May not return all args. The args are returned in reverse order.
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PushedArgs getPushedArgInstructions(IList<Instruction> instructions, int index) {
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try {
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int pushes, pops;
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DotNetUtils.calculateStackUsage(instructions[index], false, out pushes, out pops);
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if (pops != -1)
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return getPushedArgInstructions(instructions, index, pops);
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}
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catch (System.NullReferenceException) {
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// Here if eg. invalid metadata token in a call instruction (operand is null)
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}
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return new PushedArgs(0);
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}
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// May not return all args. The args are returned in reverse order.
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PushedArgs getPushedArgInstructions(IList<Instruction> instructions, int index, int numArgs) {
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var pushedArgs = new PushedArgs(numArgs);
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Instruction instr;
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int skipPushes = 0;
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while (index >= 0 && pushedArgs.CanAddMore) {
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instr = getPreviousInstruction(instructions, ref index);
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if (instr == null)
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break;
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int pushes, pops;
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DotNetUtils.calculateStackUsage(instr, false, out pushes, out pops);
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if (pops == -1)
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break;
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if (instr.OpCode.Code == Code.Dup) {
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pushes = 1;
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pops = 0;
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}
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if (pushes > 1)
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break;
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if (skipPushes > 0) {
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skipPushes -= pushes;
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if (skipPushes < 0)
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break;
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skipPushes += pops;
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}
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else {
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if (pushes == 1)
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pushedArgs.add(instr);
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skipPushes += pops;
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}
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}
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instr = pushedArgs.get(0);
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if (instr != null && instr.OpCode.Code == Code.Dup) {
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instr = getPreviousInstruction(instructions, ref index);
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|
if (instr != null) {
|
|
int pushes, pops;
|
|
DotNetUtils.calculateStackUsage(instr, false, out pushes, out pops);
|
|
if (pushes == 1 && pops == 0)
|
|
pushedArgs.set(0, instr);
|
|
}
|
|
}
|
|
pushedArgs.fixDups();
|
|
|
|
return pushedArgs;
|
|
}
|
|
|
|
bool deobfuscateFields() {
|
|
foreach (var info in fieldWrites.Values)
|
|
info.clear();
|
|
|
|
foreach (var method in allMethods) {
|
|
if (method.Body == null)
|
|
continue;
|
|
var instructions = method.Body.Instructions;
|
|
for (int i = 0; i < instructions.Count; i++) {
|
|
var instr = instructions[i];
|
|
TypeReference fieldType = null;
|
|
TypeInfo<FieldDefinition> info = null;
|
|
FieldReference field;
|
|
switch (instr.OpCode.Code) {
|
|
case Code.Stfld:
|
|
case Code.Stsfld:
|
|
field = instr.Operand as FieldReference;
|
|
if (field == null)
|
|
continue;
|
|
if (!fieldWrites.TryGetValue(new FieldReferenceAndDeclaringTypeKey(field), out info))
|
|
continue;
|
|
bool wasNewobj;
|
|
fieldType = getLoadedType(method, instructions, i, out wasNewobj);
|
|
if (fieldType == null)
|
|
continue;
|
|
info.add(fieldType, wasNewobj);
|
|
break;
|
|
|
|
case Code.Call:
|
|
case Code.Calli:
|
|
case Code.Callvirt:
|
|
case Code.Newobj:
|
|
var pushedArgs = getPushedArgInstructions(instructions, i);
|
|
var calledMethod = instr.Operand as MethodReference;
|
|
if (calledMethod == null)
|
|
continue;
|
|
IList<TypeReference> calledMethodArgs = DotNetUtils.getArgs(calledMethod);
|
|
calledMethodArgs = DotNetUtils.replaceGenericParameters(calledMethod.DeclaringType as GenericInstanceType, calledMethod as GenericInstanceMethod, calledMethodArgs);
|
|
for (int j = 0; j < pushedArgs.NumValidArgs; j++) {
|
|
var pushInstr = pushedArgs.getEnd(j);
|
|
if (pushInstr.OpCode.Code != Code.Ldfld && pushInstr.OpCode.Code != Code.Ldsfld)
|
|
continue;
|
|
|
|
field = pushInstr.Operand as FieldReference;
|
|
if (field == null)
|
|
continue;
|
|
if (!fieldWrites.TryGetValue(new FieldReferenceAndDeclaringTypeKey(field), out info))
|
|
continue;
|
|
fieldType = calledMethodArgs[calledMethodArgs.Count - 1 - j];
|
|
if (!isValidType(fieldType))
|
|
continue;
|
|
info.add(fieldType);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool changed = false;
|
|
var removeThese = new List<FieldDefinition>();
|
|
foreach (var info in fieldWrites.Values) {
|
|
if (info.updateNewType(module)) {
|
|
removeThese.Add(info.arg);
|
|
getUpdatedField(info.arg).newFieldType = info.newType;
|
|
info.arg.FieldType = info.newType;
|
|
changed = true;
|
|
}
|
|
}
|
|
foreach (var field in removeThese)
|
|
fieldWrites.Remove(new FieldReferenceAndDeclaringTypeKey(field));
|
|
return changed;
|
|
}
|
|
|
|
TypeReference getLoadedType(MethodDefinition method, IList<Instruction> instructions, int instrIndex, out bool wasNewobj) {
|
|
wasNewobj = false;
|
|
var pushedArgs = getPushedArgInstructions(instructions, instrIndex);
|
|
var pushInstr = pushedArgs.getEnd(0);
|
|
if (pushInstr == null)
|
|
return null;
|
|
|
|
TypeReference fieldType;
|
|
switch (pushInstr.OpCode.Code) {
|
|
case Code.Ldstr:
|
|
fieldType = module.TypeSystem.String;
|
|
break;
|
|
|
|
case Code.Call:
|
|
case Code.Calli:
|
|
case Code.Callvirt:
|
|
var calledMethod = pushInstr.Operand as MethodReference;
|
|
if (calledMethod == null)
|
|
return null;
|
|
fieldType = calledMethod.MethodReturnType.ReturnType;
|
|
break;
|
|
|
|
case Code.Newarr:
|
|
fieldType = pushInstr.Operand as TypeReference;
|
|
if (fieldType == null)
|
|
return null;
|
|
fieldType = new ArrayType(fieldType);
|
|
wasNewobj = true;
|
|
break;
|
|
|
|
case Code.Newobj:
|
|
var ctor = pushInstr.Operand as MethodReference;
|
|
if (ctor == null)
|
|
return null;
|
|
fieldType = ctor.DeclaringType;
|
|
wasNewobj = true;
|
|
break;
|
|
|
|
case Code.Castclass:
|
|
case Code.Isinst:
|
|
fieldType = pushInstr.Operand as TypeReference;
|
|
break;
|
|
|
|
case Code.Ldarg:
|
|
case Code.Ldarg_S:
|
|
case Code.Ldarg_0:
|
|
case Code.Ldarg_1:
|
|
case Code.Ldarg_2:
|
|
case Code.Ldarg_3:
|
|
fieldType = DotNetUtils.getArgType(method, pushInstr);
|
|
break;
|
|
|
|
case Code.Ldloc:
|
|
case Code.Ldloc_S:
|
|
case Code.Ldloc_0:
|
|
case Code.Ldloc_1:
|
|
case Code.Ldloc_2:
|
|
case Code.Ldloc_3:
|
|
var local = DotNetUtils.getLocalVar(method.Body.Variables, pushInstr);
|
|
if (local == null)
|
|
return null;
|
|
fieldType = local.VariableType;
|
|
break;
|
|
|
|
case Code.Ldfld:
|
|
case Code.Ldsfld:
|
|
var field2 = pushInstr.Operand as FieldReference;
|
|
if (field2 == null)
|
|
return null;
|
|
fieldType = field2.FieldType;
|
|
break;
|
|
|
|
default:
|
|
return null;
|
|
}
|
|
|
|
if (!isValidType(fieldType))
|
|
return null;
|
|
|
|
return fieldType;
|
|
}
|
|
|
|
static bool isValidType(TypeReference type) {
|
|
if (type == null)
|
|
return false;
|
|
if (type.IsValueType)
|
|
return false;
|
|
if (MemberReferenceHelper.isSystemObject(type))
|
|
return false;
|
|
if (MemberReferenceHelper.verifyType(type, "mscorlib", "System.Void"))
|
|
return false;
|
|
|
|
switch (MemberReferenceHelper.getMemberReferenceType(type)) {
|
|
case CecilType.ArrayType:
|
|
case CecilType.GenericInstanceType:
|
|
case CecilType.PointerType:
|
|
case CecilType.TypeDefinition:
|
|
case CecilType.TypeReference:
|
|
return true;
|
|
|
|
case CecilType.ByReferenceType:
|
|
case CecilType.FunctionPointerType:
|
|
case CecilType.GenericParameter:
|
|
case CecilType.OptionalModifierType:
|
|
case CecilType.PinnedType:
|
|
case CecilType.RequiredModifierType:
|
|
case CecilType.SentinelType:
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static TypeReference getCommonBaseClass(ModuleDefinition module, TypeReference a, TypeReference b) {
|
|
if (DotNetUtils.isDelegate(a) && DotNetUtils.derivesFromDelegate(DotNetUtils.getType(module, b)))
|
|
return b;
|
|
if (DotNetUtils.isDelegate(b) && DotNetUtils.derivesFromDelegate(DotNetUtils.getType(module, a)))
|
|
return a;
|
|
return null; //TODO:
|
|
}
|
|
|
|
static Instruction getPreviousInstruction(IList<Instruction> instructions, ref int instrIndex) {
|
|
while (true) {
|
|
instrIndex--;
|
|
if (instrIndex < 0)
|
|
return null;
|
|
var instr = instructions[instrIndex];
|
|
if (instr.OpCode.Code == Code.Nop)
|
|
continue;
|
|
if (instr.OpCode.OpCodeType == OpCodeType.Prefix)
|
|
continue;
|
|
switch (instr.OpCode.FlowControl) {
|
|
case FlowControl.Next:
|
|
case FlowControl.Call:
|
|
return instr;
|
|
default:
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|