112 lines
3.9 KiB
C#
112 lines
3.9 KiB
C#
/*
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Copyright (C) 2011-2015 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 dnlib.DotNet;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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class ResourceMethodsRestorer : MethodCallRestorerBase {
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TypeDef getManifestResourceStreamType;
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EmbeddedResource getManifestResourceStreamTypeResource;
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public TypeDef Type {
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get { return getManifestResourceStreamType; }
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}
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public Resource Resource {
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get { return getManifestResourceStreamTypeResource; }
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}
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public ResourceMethodsRestorer(ModuleDefMD module)
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: base(module) {
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}
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public void Find(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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foreach (var type in module.Types) {
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if (type.Fields.Count != 1)
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continue;
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if (type.HasNestedTypes || type.HasGenericParameters || type.IsValueType)
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continue;
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if (DotNetUtils.GetField(type, "System.Reflection.Assembly") == null)
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continue;
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if (type.FindStaticConstructor() == null)
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continue;
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var getStream2 = GetTheOnlyMethod(type, "System.IO.Stream", "(System.Reflection.Assembly,System.Type,System.String)");
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var getNames = GetTheOnlyMethod(type, "System.String[]", "(System.Reflection.Assembly)");
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var getRefAsms = GetTheOnlyMethod(type, "System.Reflection.AssemblyName[]", "(System.Reflection.Assembly)");
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var bitmapCtor = GetTheOnlyMethod(type, "System.Drawing.Bitmap", "(System.Type,System.String)");
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var iconCtor = GetTheOnlyMethod(type, "System.Drawing.Icon", "(System.Type,System.String)");
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if (getStream2 == null && getNames == null && getRefAsms == null &&
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bitmapCtor == null && iconCtor == null)
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continue;
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var resource = FindGetManifestResourceStreamTypeResource(type, simpleDeobfuscator, deob);
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if (resource == null && getStream2 != null)
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continue;
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getManifestResourceStreamType = type;
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CreateGetManifestResourceStream2(getStream2);
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CreateGetManifestResourceNames(getNames);
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CreateGetReferencedAssemblies(getRefAsms);
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CreateBitmapCtor(bitmapCtor);
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CreateIconCtor(iconCtor);
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getManifestResourceStreamTypeResource = resource;
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break;
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}
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}
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EmbeddedResource FindGetManifestResourceStreamTypeResource(TypeDef type, ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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foreach (var method in type.Methods) {
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if (!method.IsPrivate || !method.IsStatic || method.Body == null)
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continue;
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if (!DotNetUtils.IsMethod(method, "System.String", "(System.Reflection.Assembly,System.Type,System.String)"))
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continue;
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simpleDeobfuscator.Deobfuscate(method);
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simpleDeobfuscator.DecryptStrings(method, deob);
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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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static MethodDef GetTheOnlyMethod(TypeDef type, string returnType, string parameters) {
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MethodDef foundMethod = null;
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foreach (var method in type.Methods) {
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if (!method.IsStatic || method.Body == null || method.HasGenericParameters)
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continue;
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if (method.IsPrivate)
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continue;
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if (!DotNetUtils.IsMethod(method, returnType, parameters))
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continue;
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if (foundMethod != null)
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return null;
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foundMethod = method;
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}
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return foundMethod;
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}
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}
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}
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