97 lines
3.8 KiB
C#
97 lines
3.8 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 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 GetManifestResourceStreamRestorerBase {
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protected ModuleDefinition module;
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protected MethodDefinition getManifestResourceStream1Method;
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protected MethodDefinition getManifestResourceStream2Method;
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protected MethodDefinition getManifestResourceNamesMethod;
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protected MethodReference Assembly_GetManifestResourceStream1;
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protected MethodReference Assembly_GetManifestResourceStream2;
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protected MethodReference Assembly_GetManifestResourceNames;
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public MethodDefinition GetStream1Method {
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set { getManifestResourceStream1Method = value; }
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}
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public MethodDefinition GetStream2Method {
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set { getManifestResourceStream2Method = value; }
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}
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public MethodDefinition GetNamesMethod {
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set { getManifestResourceNamesMethod = value; }
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}
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public GetManifestResourceStreamRestorerBase(ModuleDefinition module) {
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this.module = module;
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createGetManifestResourceStreamMethods();
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}
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void createGetManifestResourceStreamMethods() {
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var assemblyType = new TypeReference("System.Reflection", "Assembly", module, module.TypeSystem.Corlib);
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var typeType = new TypeReference("System", "Type", module, module.TypeSystem.Corlib);
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var streamType = new TypeReference("System.IO", "Stream", module, module.TypeSystem.Corlib);
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var stringArrayType = new ArrayType(module.TypeSystem.String);
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Assembly_GetManifestResourceStream1 = new MethodReference("GetManifestResourceStream", streamType, assemblyType);
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Assembly_GetManifestResourceStream1.HasThis = true;
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Assembly_GetManifestResourceStream1.Parameters.Add(new ParameterDefinition(module.TypeSystem.String));
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Assembly_GetManifestResourceStream2 = new MethodReference("GetManifestResourceStream", streamType, assemblyType);
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Assembly_GetManifestResourceStream2.HasThis = true;
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Assembly_GetManifestResourceStream2.Parameters.Add(new ParameterDefinition(typeType));
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Assembly_GetManifestResourceStream2.Parameters.Add(new ParameterDefinition(module.TypeSystem.String));
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Assembly_GetManifestResourceNames = new MethodReference("GetManifestResourceNames", stringArrayType, assemblyType);
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Assembly_GetManifestResourceNames.HasThis = true;
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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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MethodReference newMethod = null;
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if (calledMethod == getManifestResourceStream1Method)
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newMethod = Assembly_GetManifestResourceStream1;
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else if (calledMethod == getManifestResourceStream2Method)
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newMethod = Assembly_GetManifestResourceStream2;
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else if (calledMethod == getManifestResourceNamesMethod)
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newMethod = Assembly_GetManifestResourceNames;
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if (newMethod == null)
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continue;
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instrs[i] = new Instr(Instruction.Create(OpCodes.Callvirt, newMethod));
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}
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}
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}
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}
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}
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