2011-11-06 19:19:26 +08:00
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/*
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2012-01-10 06:02:47 +08:00
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Copyright (C) 2011-2012 de4dot@gmail.com
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2011-11-06 19:19:26 +08:00
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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;
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2012-04-22 22:18:41 +08:00
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using System.IO;
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2011-11-06 19:19:26 +08:00
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using Mono.Cecil;
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2012-04-22 20:16:33 +08:00
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using de4dot.blocks;
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2012-04-22 22:18:41 +08:00
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using de4dot.PE;
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2011-11-06 19:19:26 +08:00
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2011-12-09 16:02:06 +08:00
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namespace de4dot.code.deobfuscators.CliSecure {
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2011-11-06 19:19:26 +08:00
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class CliSecureRtType {
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ModuleDefinition module;
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TypeDefinition cliSecureRtType;
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MethodDefinition postInitializeMethod;
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MethodDefinition initializeMethod;
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MethodDefinition stringDecrypterMethod;
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MethodDefinition loadMethod;
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2012-04-22 22:18:41 +08:00
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bool foundSig;
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2011-11-06 19:19:26 +08:00
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public bool Detected {
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get { return foundSig || cliSecureRtType != null; }
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2011-11-06 19:19:26 +08:00
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}
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public TypeDefinition Type {
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get { return cliSecureRtType; }
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}
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public MethodDefinition StringDecrypterMethod {
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get { return stringDecrypterMethod; }
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}
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public MethodDefinition PostInitializeMethod {
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get { return postInitializeMethod; }
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}
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public MethodDefinition InitializeMethod {
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get { return initializeMethod; }
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}
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public MethodDefinition LoadMethod {
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get { return loadMethod; }
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}
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public CliSecureRtType(ModuleDefinition module) {
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this.module = module;
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}
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public CliSecureRtType(ModuleDefinition module, CliSecureRtType oldOne) {
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this.module = module;
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cliSecureRtType = lookup(oldOne.cliSecureRtType, "Could not find CliSecureRt type");
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postInitializeMethod = lookup(oldOne.postInitializeMethod, "Could not find postInitializeMethod method");
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initializeMethod = lookup(oldOne.initializeMethod, "Could not find initializeMethod method");
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stringDecrypterMethod = lookup(oldOne.stringDecrypterMethod, "Could not find stringDecrypterMethod method");
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loadMethod = lookup(oldOne.loadMethod, "Could not find loadMethod method");
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2012-04-23 20:40:46 +08:00
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foundSig = oldOne.foundSig;
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2011-11-06 19:19:26 +08:00
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}
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T lookup<T>(T def, string errorMessage) where T : MemberReference {
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return DeobUtils.lookup(module, def, errorMessage);
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}
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public void find() {
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if (cliSecureRtType != null)
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return;
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2012-04-22 20:16:33 +08:00
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if (find2())
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return;
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2012-04-22 22:18:41 +08:00
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if (findOld())
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return;
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findNativeCode();
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2012-04-22 20:16:33 +08:00
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}
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2011-11-06 19:19:26 +08:00
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2012-04-22 20:16:33 +08:00
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bool find2() {
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2011-11-06 19:19:26 +08:00
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foreach (var type in module.Types) {
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if (type.Namespace != "")
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continue;
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var typeName = type.FullName;
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MethodDefinition cs = null;
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MethodDefinition initialize = null;
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MethodDefinition postInitialize = null;
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MethodDefinition load = null;
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int methods = 0;
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foreach (var method in type.Methods) {
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if (method.FullName == "System.String " + typeName + "::cs(System.String)") {
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cs = method;
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methods++;
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}
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else if (method.FullName == "System.Void " + typeName + "::Initialize()") {
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initialize = method;
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methods++;
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}
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else if (method.FullName == "System.Void " + typeName + "::PostInitialize()") {
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postInitialize = method;
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methods++;
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}
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else if (method.FullName == "System.IntPtr " + typeName + "::Load()") {
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load = method;
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methods++;
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}
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}
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2011-12-21 13:40:10 +08:00
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if (methods == 0 || (methods == 1 && initialize != null))
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2011-11-06 19:19:26 +08:00
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continue;
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stringDecrypterMethod = cs;
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initializeMethod = initialize;
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postInitializeMethod = postInitialize;
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loadMethod = load;
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cliSecureRtType = type;
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2012-04-22 20:16:33 +08:00
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return true;
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}
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return false;
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}
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bool findOld() {
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var methodToCheck = DotNetUtils.getModuleTypeCctor(module);
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if (methodToCheck == null)
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return false;
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foreach (var calledMethod in DotNetUtils.getCalledMethods(module, methodToCheck)) {
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var type = calledMethod.DeclaringType;
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if (!hasPinvokeMethod(type, "_Initialize"))
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continue;
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if (!hasPinvokeMethod(type, "_Initialize64"))
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continue;
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initializeMethod = calledMethod;
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cliSecureRtType = type;
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return true;
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}
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return false;
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}
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2012-04-22 22:18:41 +08:00
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bool findNativeCode() {
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if ((module.Attributes & ModuleAttributes.ILOnly) != 0)
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return false;
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2012-04-23 20:25:12 +08:00
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using (var file = new FileStream(module.FullyQualifiedName, FileMode.Open, FileAccess.Read, FileShare.Read)) {
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var peImage = new PeImage(file);
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return foundSig = MethodsDecrypter.detect(peImage);
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}
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2012-04-22 22:18:41 +08:00
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}
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2012-04-22 20:16:33 +08:00
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static bool hasPinvokeMethod(TypeDefinition type, string methodName) {
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2012-04-23 03:03:06 +08:00
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if (type == null)
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return false;
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2012-04-22 20:16:33 +08:00
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foreach (var method in type.Methods) {
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if (method.PInvokeInfo == null)
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continue;
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if (method.PInvokeInfo.EntryPoint == methodName)
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return true;
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2011-11-06 19:19:26 +08:00
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}
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2012-04-22 20:16:33 +08:00
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return false;
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2011-11-06 19:19:26 +08:00
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}
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2012-04-23 03:03:06 +08:00
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public bool isAtLeastVersion50() {
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return hasPinvokeMethod(cliSecureRtType, "LoadLibraryA");
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}
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2011-11-06 19:19:26 +08:00
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}
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}
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