124 lines
4.4 KiB
C#
124 lines
4.4 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.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.code.deobfuscators {
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class MethodCallRestorerBase {
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protected MemberReferenceBuilder builder;
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protected ModuleDefinition module;
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class NewMethodInfo {
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public OpCode opCode;
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public MethodReference method;
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public NewMethodInfo(OpCode opCode, MethodReference method) {
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this.opCode = opCode;
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this.method = method;
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}
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}
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MethodDefinitionAndDeclaringTypeDict<NewMethodInfo> oldToNewMethod = new MethodDefinitionAndDeclaringTypeDict<NewMethodInfo>();
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public MethodCallRestorerBase(ModuleDefinition module) {
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this.module = module;
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this.builder = new MemberReferenceBuilder(module);
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}
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public void createGetManifestResourceStream1(MethodDefinition oldMethod) {
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if (oldMethod == null)
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return;
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var assemblyType = builder.type("System.Reflection", "Assembly", builder.CorLib);
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var streamType = builder.type("System.IO", "Stream", builder.CorLib);
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var newMethod = builder.instanceMethod("GetManifestResourceStream", assemblyType, streamType, builder.String);
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add(oldMethod, newMethod, OpCodes.Callvirt);
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}
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public void createGetManifestResourceStream2(MethodDefinition oldMethod) {
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if (oldMethod == null)
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return;
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var assemblyType = builder.type("System.Reflection", "Assembly", builder.CorLib);
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var typeType = builder.type("System", "Type", builder.CorLib);
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var streamType = builder.type("System.IO", "Stream", builder.CorLib);
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var newMethod = builder.instanceMethod("GetManifestResourceStream", assemblyType, streamType, typeType, builder.String);
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add(oldMethod, newMethod, OpCodes.Callvirt);
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}
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public void createGetManifestResourceNames(MethodDefinition oldMethod) {
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if (oldMethod == null)
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return;
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var assemblyType = builder.type("System.Reflection", "Assembly", builder.CorLib);
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var stringArrayType = builder.array(builder.String);
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var newMethod = builder.instanceMethod("GetManifestResourceNames", assemblyType, stringArrayType);
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add(oldMethod, newMethod, OpCodes.Callvirt);
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}
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public void createBitmapCtor(MethodDefinition oldMethod) {
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if (oldMethod == null)
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return;
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var bitmapType = builder.type("System.Drawing", "Bitmap", "System.Drawing");
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var typeType = builder.type("System", "Type", builder.CorLib);
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var newMethod = builder.instanceMethod(".ctor", bitmapType, builder.Void, typeType, builder.String);
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add(oldMethod, newMethod, OpCodes.Newobj);
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}
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public void createIconCtor(MethodDefinition oldMethod) {
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if (oldMethod == null)
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return;
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var iconType = builder.type("System.Drawing", "Icon", "System.Drawing");
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var typeType = builder.type("System", "Type", builder.CorLib);
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var newMethod = builder.instanceMethod(".ctor", iconType, builder.Void, typeType, builder.String);
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add(oldMethod, newMethod, OpCodes.Newobj);
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}
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protected void add(MethodDefinition oldMethod, MethodReference newMethod) {
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add(oldMethod, newMethod, OpCodes.Callvirt);
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}
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protected void add(MethodDefinition oldMethod, MethodReference newMethod, OpCode opCode) {
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if (oldMethod == null)
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return;
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oldToNewMethod.add(oldMethod, new NewMethodInfo(opCode, newMethod));
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}
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public void deobfuscate(Blocks blocks) {
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foreach (var block in blocks.MethodBlocks.getAllBlocks()) {
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var instrs = block.Instructions;
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for (int i = 0; i < instrs.Count; i++) {
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var call = instrs[i];
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if (call.OpCode.Code != Code.Call)
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continue;
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var calledMethod = call.Operand as MethodDefinition;
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if (calledMethod == null)
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continue;
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var newMethodInfo = oldToNewMethod.find(calledMethod);
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if (newMethodInfo == null)
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continue;
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instrs[i] = new Instr(Instruction.Create(newMethodInfo.opCode, newMethodInfo.method));
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}
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}
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}
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}
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}
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