87 lines
2.9 KiB
C#
87 lines
2.9 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.Babel_NET {
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static class BabelUtils {
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public static EmbeddedResource findEmbeddedResource(ModuleDefinition module, TypeDefinition decrypterType) {
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return findEmbeddedResource(module, decrypterType, (method) => { });
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}
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public static EmbeddedResource findEmbeddedResource(ModuleDefinition module, TypeDefinition decrypterType, ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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return findEmbeddedResource(module, decrypterType, (method) => {
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simpleDeobfuscator.deobfuscate(method);
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simpleDeobfuscator.decryptStrings(method, deob);
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});
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}
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public static EmbeddedResource findEmbeddedResource(ModuleDefinition module, TypeDefinition decrypterType, Action<MethodDefinition> fixMethod) {
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foreach (var method in decrypterType.Methods) {
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if (!DotNetUtils.isMethod(method, "System.String", "()"))
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continue;
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if (!method.IsStatic)
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continue;
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fixMethod(method);
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foreach (var s in DotNetUtils.getCodeStrings(method)) {
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var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
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if (resource != null)
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return resource;
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}
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}
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return null;
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}
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public static bool findRegisterMethod(TypeDefinition type, out MethodDefinition regMethod, out MethodDefinition handler) {
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foreach (var method in type.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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if (method.Body.ExceptionHandlers.Count != 1)
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continue;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Ldftn)
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continue;
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var handlerRef = instr.Operand as MethodReference;
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if (handlerRef == null)
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continue;
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if (!DotNetUtils.isMethod(handlerRef, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)"))
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continue;
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if (!MemberReferenceHelper.compareTypes(type, handlerRef.DeclaringType))
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continue;
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handler = DotNetUtils.getMethod(type, handlerRef);
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if (handler == null)
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continue;
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if (handler.Body == null || handler.Body.ExceptionHandlers.Count != 1)
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continue;
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regMethod = method;
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return true;
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}
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}
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regMethod = null;
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handler = null;
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return false;
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}
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}
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}
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