Merge other proxy method class with the V10 one
This commit is contained in:
parent
94acbc7131
commit
a2798908b0
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@ -73,7 +73,6 @@ namespace de4dot.code.deobfuscators.Confuser {
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List<EmbeddedAssemblyInfo> embeddedAssemblyInfos = new List<EmbeddedAssemblyInfo>();
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JitMethodsDecrypter jitMethodsDecrypter;
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MemoryMethodsDecrypter memoryMethodsDecrypter;
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ProxyCallFixer proxyCallFixer;
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ProxyCallFixerV10 proxyCallFixerV10;
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AntiDebugger antiDebugger;
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AntiDumping antiDumping;
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@ -134,7 +133,6 @@ namespace de4dot.code.deobfuscators.Confuser {
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int sum = toInt32(jitMethodsDecrypter != null ? jitMethodsDecrypter.Detected : false) +
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toInt32(memoryMethodsDecrypter != null ? memoryMethodsDecrypter.Detected : false) +
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toInt32(proxyCallFixer != null ? proxyCallFixer.Detected : false) +
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toInt32(proxyCallFixerV10 != null ? proxyCallFixerV10.Detected : false) +
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toInt32(antiDebugger != null ? antiDebugger.Detected : false) +
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toInt32(antiDumping != null ? antiDumping.Detected : false) +
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@ -191,12 +189,8 @@ namespace de4dot.code.deobfuscators.Confuser {
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}
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} while (false);
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proxyCallFixer = new ProxyCallFixer(module, getFileData(), DeobfuscatedFile);
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proxyCallFixer.findDelegateCreator();
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if (!proxyCallFixer.Detected) {
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proxyCallFixerV10 = new ProxyCallFixerV10(module, getFileData());
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proxyCallFixerV10.findDelegateCreator(DeobfuscatedFile);
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}
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antiDebugger = new AntiDebugger(module);
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antiDebugger.find();
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antiDumping = new AntiDumping(module);
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@ -346,8 +340,6 @@ namespace de4dot.code.deobfuscators.Confuser {
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addTypeToBeRemoved(antiDumping.Type, "Anti dumping type");
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}
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if (proxyCallFixer != null)
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proxyCallFixer.find();
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if (proxyCallFixerV10 != null)
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proxyCallFixerV10.find();
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@ -503,8 +495,6 @@ namespace de4dot.code.deobfuscators.Confuser {
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}
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public override void deobfuscateMethodEnd(Blocks blocks) {
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if (proxyCallFixer != null)
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proxyCallFixer.deobfuscate(blocks);
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if (proxyCallFixerV10 != null)
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proxyCallFixerV10.deobfuscate(blocks);
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resourceDecrypter.deobfuscate(blocks);
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@ -519,8 +509,6 @@ namespace de4dot.code.deobfuscators.Confuser {
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}
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public override void deobfuscateEnd() {
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if (proxyCallFixer != null)
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removeProxyDelegates(proxyCallFixer);
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if (proxyCallFixerV10 != null) {
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if (removeProxyDelegates(proxyCallFixerV10))
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addFieldsToBeRemoved(proxyCallFixerV10.Fields, "Proxy delegate instance field");
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@ -1,274 +0,0 @@
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/*
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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;
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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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using de4dot.PE;
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namespace de4dot.code.deobfuscators.Confuser {
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// Since 1.8 r75367
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class ProxyCallFixer : ProxyCallFixer2 {
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byte[] fileData;
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ISimpleDeobfuscator simpleDeobfuscator;
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MethodDefinitionAndDeclaringTypeDict<ProxyCreatorInfo> methodToInfo = new MethodDefinitionAndDeclaringTypeDict<ProxyCreatorInfo>();
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FieldDefinitionAndDeclaringTypeDict<MethodDefinition> fieldToMethod = new FieldDefinitionAndDeclaringTypeDict<MethodDefinition>();
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x86Emulator x86emu;
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enum ProxyCreatorType {
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None,
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CallOrCallvirt,
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Newobj,
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}
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class ProxyCreatorInfo {
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public readonly MethodDefinition creatorMethod;
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public readonly ProxyCreatorType proxyCreatorType;
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public uint? key;
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public MethodDefinition nativeMethod;
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public ushort callvirtChar;
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public ProxyCreatorInfo(MethodDefinition creatorMethod, ProxyCreatorType proxyCreatorType) {
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this.creatorMethod = creatorMethod;
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this.proxyCreatorType = proxyCreatorType;
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}
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}
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protected override bool ProxyCallIsObfuscated {
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get { return true; }
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}
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public override IEnumerable<Tuple<MethodDefinition, string>> OtherMethods {
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get {
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var list = new List<Tuple<MethodDefinition, string>>();
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foreach (var info in methodToInfo.getValues()) {
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list.Add(new Tuple<MethodDefinition, string> {
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Item1 = info.creatorMethod,
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Item2 = "Delegate creator method",
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});
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list.Add(new Tuple<MethodDefinition, string> {
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Item1 = info.nativeMethod,
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Item2 = "Calculate RID native method",
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});
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}
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return list;
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}
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}
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public ProxyCallFixer(ModuleDefinition module, byte[] fileData, ISimpleDeobfuscator simpleDeobfuscator)
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: base(module) {
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this.fileData = fileData;
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this.simpleDeobfuscator = simpleDeobfuscator;
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}
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protected override object checkCctor(TypeDefinition type, MethodDefinition cctor) {
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var instrs = cctor.Body.Instructions;
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object retVal = null;
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for (int i = 0; i < instrs.Count - 1; i++) {
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var ldtoken = instrs[i];
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if (ldtoken.OpCode.Code != Code.Ldtoken)
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continue;
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var field = ldtoken.Operand as FieldDefinition;
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if (field == null)
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continue;
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var call = instrs[i + 1];
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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 (!isDelegateCreatorMethod(calledMethod))
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continue;
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fieldToMethod.add(field, calledMethod);
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retVal = this;
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}
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return retVal;
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}
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protected override void getCallInfo(object context, FieldDefinition field, out MethodReference calledMethod, out OpCode callOpcode) {
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var info = getProxyCreatorInfo(field);
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var sig = module.GetSignatureBlob(field);
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int len = sig.Length;
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uint magic = (uint)((sig[len - 2] << 24) | (sig[len - 3] << 16) | (sig[len - 5] << 8) | sig[len - 6]);
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uint rid = getRid(info, magic);
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int token = (sig[len - 7] << 24) | (int)rid;
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calledMethod = module.LookupToken(token) as MethodReference;
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callOpcode = getCallOpCode(info, field);
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}
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OpCode getCallOpCode(ProxyCreatorInfo info, FieldDefinition field) {
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switch (info.proxyCreatorType) {
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case ProxyCreatorType.CallOrCallvirt:
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if (field.Name.Length > 0 && field.Name[0] == info.callvirtChar)
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return OpCodes.Callvirt;
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return OpCodes.Call;
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case ProxyCreatorType.Newobj:
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return OpCodes.Newobj;
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default: throw new NotSupportedException();
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}
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}
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ProxyCreatorInfo getProxyCreatorInfo(FieldReference field) {
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return methodToInfo.find(fieldToMethod.find(field));
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}
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uint getRid(ProxyCreatorInfo info, uint magic) {
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if (info.key != null)
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return magic ^ info.key.Value;
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if (info.nativeMethod != null) {
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if (x86emu == null)
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x86emu = new x86Emulator(new PeImage(fileData));
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return x86emu.emulate((uint)info.nativeMethod.RVA, magic);
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}
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throw new NotImplementedException();
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}
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public void findDelegateCreator() {
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var type = DotNetUtils.getModuleType(module);
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if (type == null)
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return;
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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 (!DotNetUtils.isMethod(method, "System.Void", "(System.RuntimeFieldHandle)"))
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continue;
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var creatorType = getProxyCreatorType(method);
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if (creatorType == ProxyCreatorType.None)
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continue;
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if (!DotNetUtils.callsMethod(method, "System.Byte[] System.Reflection.Module::ResolveSignature(System.Int32)"))
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continue;
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if (!DotNetUtils.callsMethod(method, "System.Reflection.MethodBase System.Reflection.Module::ResolveMethod(System.Int32)"))
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continue;
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methodToInfo.add(method, createProxyCreatorInfo(method, creatorType));
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setDelegateCreatorMethod(method);
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}
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}
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static ProxyCreatorType getProxyCreatorType(MethodDefinition method) {
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foreach (var instr in method.Body.Instructions) {
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var field = instr.Operand as FieldReference;
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if (field == null)
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continue;
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switch (field.FullName) {
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case "System.Reflection.Emit.OpCode System.Reflection.Emit.OpCodes::Call":
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case "System.Reflection.Emit.OpCode System.Reflection.Emit.OpCodes::Callvirt":
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return ProxyCreatorType.CallOrCallvirt;
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case "System.Reflection.Emit.OpCode System.Reflection.Emit.OpCodes::Newobj":
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return ProxyCreatorType.Newobj;
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}
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}
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return ProxyCreatorType.None;
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}
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ProxyCreatorInfo createProxyCreatorInfo(MethodDefinition creatorMethod, ProxyCreatorType proxyCreatorType) {
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simpleDeobfuscator.deobfuscate(creatorMethod, true);
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var info = new ProxyCreatorInfo(creatorMethod, proxyCreatorType);
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if (!initializeKey(info))
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throw new NotSupportedException("Couldn't find decryption key");
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if (info.proxyCreatorType == ProxyCreatorType.CallOrCallvirt) {
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if (!initializeCallvirtChar(info))
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throw new ApplicationException("Couldn't find callvirt char");
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}
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return info;
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}
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bool initializeKey(ProxyCreatorInfo info) {
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var instrs = info.creatorMethod.Body.Instructions;
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for (int index = 0; index < instrs.Count; index++) {
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index = ConfuserUtils.findCallMethod(instrs, index, Code.Callvirt, "System.Reflection.Module System.Reflection.MemberInfo::get_Module()");
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if (index < 0)
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break;
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uint key;
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if (getKey(instrs, index + 1, out key)) {
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info.key = key;
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return true;
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}
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var nativeMethod = getNativeMethod(instrs, index + 1);
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if (nativeMethod != null) {
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info.nativeMethod = nativeMethod;
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return true;
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}
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}
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return false;
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}
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static bool getKey(IList<Instruction> instrs, int index, out uint key) {
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key = 0;
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if (index + 2 >= instrs.Count)
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return false;
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if (!DotNetUtils.isLdloc(instrs[index++]))
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return false;
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var ldci4 = instrs[index++];
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if (!DotNetUtils.isLdcI4(ldci4))
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return false;
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if (instrs[index++].OpCode.Code != Code.Xor)
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return false;
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key = (uint)DotNetUtils.getLdcI4Value(ldci4);
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return true;
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}
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static MethodDefinition getNativeMethod(IList<Instruction> instrs, int index) {
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if (index + 1 >= instrs.Count)
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return null;
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if (!DotNetUtils.isLdloc(instrs[index++]))
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return null;
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var call = instrs[index++];
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if (call.OpCode.Code != Code.Call)
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return null;
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var calledMethod = call.Operand as MethodDefinition;
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if (calledMethod == null || calledMethod.Body != null || !calledMethod.IsNative)
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return null;
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return calledMethod;
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}
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bool initializeCallvirtChar(ProxyCreatorInfo info) {
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var instrs = info.creatorMethod.Body.Instructions;
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for (int index = 0; index < instrs.Count; index++) {
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index = ConfuserUtils.findCallMethod(instrs, index, Code.Callvirt, "System.Char System.String::get_Chars(System.Int32)");
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if (index < 0)
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break;
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index++;
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if (index >= instrs.Count)
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break;
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var ldci4 = instrs[index];
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if (!DotNetUtils.isLdcI4(ldci4))
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continue;
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info.callvirtChar = (ushort)DotNetUtils.getLdcI4Value(ldci4);
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return true;
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}
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return false;
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}
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}
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}
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@ -34,6 +34,7 @@ namespace de4dot.code.deobfuscators.Confuser {
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ConfuserVersion version = ConfuserVersion.Unknown;
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byte[] fileData;
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x86Emulator x86emu;
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ushort callvirtChar;
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enum ConfuserVersion {
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Unknown,
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@ -45,6 +46,8 @@ namespace de4dot.code.deobfuscators.Confuser {
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v17_r73740_native,
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v17_r74708_normal,
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v17_r74708_native,
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v18_r75367_normal,
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v18_r75367_native,
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}
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enum ProxyCreatorType {
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@ -59,13 +62,15 @@ namespace de4dot.code.deobfuscators.Confuser {
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public readonly ConfuserVersion version;
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public readonly uint magic;
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public readonly MethodDefinition nativeMethod;
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public readonly ushort callvirtChar;
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public ProxyCreatorInfo(MethodDefinition creatorMethod, ProxyCreatorType proxyCreatorType, ConfuserVersion version, uint magic, MethodDefinition nativeMethod) {
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public ProxyCreatorInfo(MethodDefinition creatorMethod, ProxyCreatorType proxyCreatorType, ConfuserVersion version, uint magic, MethodDefinition nativeMethod, ushort callvirtChar) {
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this.creatorMethod = creatorMethod;
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this.proxyCreatorType = proxyCreatorType;
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this.version = version;
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this.magic = magic;
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this.nativeMethod = nativeMethod;
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this.callvirtChar = callvirtChar;
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}
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}
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@ -206,6 +211,14 @@ namespace de4dot.code.deobfuscators.Confuser {
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getCallInfo_v17_r73740_native(info, creatorInfo, out calledMethod, out callOpcode);
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break;
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case ConfuserVersion.v18_r75367_normal:
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getCallInfo_v18_r75367_normal(info, creatorInfo, out calledMethod, out callOpcode);
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break;
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case ConfuserVersion.v18_r75367_native:
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getCallInfo_v18_r75367_native(info, creatorInfo, out calledMethod, out callOpcode);
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break;
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default:
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throw new ApplicationException("Unknown version");
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}
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@ -366,6 +379,45 @@ namespace de4dot.code.deobfuscators.Confuser {
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callOpcode = getCallOpCode(creatorInfo, isCallvirt);
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}
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void getCallInfo_v18_r75367_normal(DelegateInitInfo info, ProxyCreatorInfo creatorInfo, out MethodReference calledMethod, out OpCode callOpcode) {
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getCallInfo_v18_r75367(info, creatorInfo, out calledMethod, out callOpcode, (creatorInfo2, magic) => creatorInfo2.magic ^ magic);
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}
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void getCallInfo_v18_r75367_native(DelegateInitInfo info, ProxyCreatorInfo creatorInfo, out MethodReference calledMethod, out OpCode callOpcode) {
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getCallInfo_v18_r75367(info, creatorInfo, out calledMethod, out callOpcode, (creatorInfo2, magic) => {
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if (x86emu == null)
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x86emu = new x86Emulator(new PeImage(fileData));
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return x86emu.emulate((uint)creatorInfo2.nativeMethod.RVA, magic);
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});
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}
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void getCallInfo_v18_r75367(DelegateInitInfo info, ProxyCreatorInfo creatorInfo, out MethodReference calledMethod, out OpCode callOpcode, Func<ProxyCreatorInfo, uint, uint> getRid) {
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var sig = module.GetSignatureBlob(info.field);
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int len = sig.Length;
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uint magic = (uint)((sig[len - 2] << 24) | (sig[len - 3] << 16) | (sig[len - 5] << 8) | sig[len - 6]);
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uint rid = getRid(creatorInfo, magic);
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int token = (sig[len - 7] << 24) | (int)rid;
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uint table = (uint)token >> 24;
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if (table != 6 && table != 0x0A && table != 0x2B)
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throw new ApplicationException("Invalid method token");
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calledMethod = module.LookupToken(token) as MethodReference;
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callOpcode = getCallOpCode(creatorInfo, info.field);
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}
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static OpCode getCallOpCode(ProxyCreatorInfo info, FieldDefinition field) {
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switch (info.proxyCreatorType) {
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case ProxyCreatorType.CallOrCallvirt:
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if (field.Name.Length > 0 && field.Name[0] == info.callvirtChar)
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return OpCodes.Callvirt;
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return OpCodes.Call;
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case ProxyCreatorType.Newobj:
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return OpCodes.Newobj;
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default: throw new NotSupportedException();
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}
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}
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// A method token is not a stable value so this method can fail to return the correct method!
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// There's nothing I can do about that. It's an obfuscator bug. It was fixed in 1.3 r55346.
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MethodReference createMethodReference(AssemblyNameReference asmRef, uint methodToken) {
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@ -413,6 +465,8 @@ namespace de4dot.code.deobfuscators.Confuser {
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public void findDelegateCreator(ISimpleDeobfuscator simpleDeobfuscator) {
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var type = DotNetUtils.getModuleType(module);
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if (type == null)
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return;
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foreach (var method in type.Methods) {
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if (method.Body == null || !method.IsStatic || !method.IsAssembly)
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continue;
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@ -438,6 +492,17 @@ namespace de4dot.code.deobfuscators.Confuser {
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else
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theVersion = ConfuserVersion.v14_r58857;
|
||||
}
|
||||
else if (!DotNetUtils.callsMethod(method, "System.Byte[] System.Convert::FromBase64String(System.String)") &&
|
||||
DotNetUtils.callsMethod(method, "System.Reflection.MethodBase System.Reflection.Module::ResolveMethod(System.Int32)")) {
|
||||
if (proxyType == ProxyCreatorType.CallOrCallvirt && !findCallvirtChar(method, out callvirtChar))
|
||||
continue;
|
||||
if ((nativeMethod = findNativeMethod_v18_r75367(method)) != null)
|
||||
theVersion = ConfuserVersion.v18_r75367_native;
|
||||
else if (findMagic_v18_r75367(method, out magic))
|
||||
theVersion = ConfuserVersion.v18_r75367_normal;
|
||||
else
|
||||
continue;
|
||||
}
|
||||
else if (is_v17_r73740(method)) {
|
||||
if (DotNetUtils.callsMethod(method, "System.Boolean System.Type::get_IsArray()")) {
|
||||
if ((nativeMethod = findNativeMethod_v17_r73740(method)) != null)
|
||||
|
@ -458,11 +523,55 @@ namespace de4dot.code.deobfuscators.Confuser {
|
|||
}
|
||||
|
||||
setDelegateCreatorMethod(method);
|
||||
methodToInfo.add(method, new ProxyCreatorInfo(method, proxyType, theVersion, magic, nativeMethod));
|
||||
methodToInfo.add(method, new ProxyCreatorInfo(method, proxyType, theVersion, magic, nativeMethod, callvirtChar));
|
||||
version = theVersion;
|
||||
}
|
||||
}
|
||||
|
||||
static bool findMagic_v18_r75367(MethodDefinition method, out uint magic) {
|
||||
var instrs = method.Body.Instructions;
|
||||
for (int i = 0; i < instrs.Count; i++) {
|
||||
i = ConfuserUtils.findCallMethod(instrs, i, Code.Callvirt, "System.Reflection.Module System.Reflection.MemberInfo::get_Module()");
|
||||
if (i < 0 || i + 3 >= instrs.Count)
|
||||
break;
|
||||
|
||||
if (!DotNetUtils.isLdloc(instrs[i + 1]))
|
||||
continue;
|
||||
var ldci4 = instrs[i + 2];
|
||||
if (!DotNetUtils.isLdcI4(ldci4))
|
||||
continue;
|
||||
if (instrs[i+3].OpCode.Code != Code.Xor)
|
||||
continue;
|
||||
|
||||
magic = (uint)DotNetUtils.getLdcI4Value(ldci4);
|
||||
return true;
|
||||
}
|
||||
magic = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
static MethodDefinition findNativeMethod_v18_r75367(MethodDefinition method) {
|
||||
var instrs = method.Body.Instructions;
|
||||
for (int i = 0; i < instrs.Count; i++) {
|
||||
i = ConfuserUtils.findCallMethod(instrs, i, Code.Callvirt, "System.Reflection.Module System.Reflection.MemberInfo::get_Module()");
|
||||
if (i < 0 || i + 2 >= instrs.Count)
|
||||
break;
|
||||
|
||||
if (!DotNetUtils.isLdloc(instrs[i + 1]))
|
||||
continue;
|
||||
|
||||
var call = instrs[i + 2];
|
||||
if (call.OpCode.Code != Code.Call)
|
||||
continue;
|
||||
var calledMethod = call.Operand as MethodDefinition;
|
||||
if (calledMethod == null || calledMethod.Body != null || !calledMethod.IsNative)
|
||||
continue;
|
||||
|
||||
return calledMethod;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
static bool findMagic_v17_r73740(MethodDefinition method, out uint magic) {
|
||||
var instrs = method.Body.Instructions;
|
||||
for (int i = 0; i < instrs.Count; i++) {
|
||||
|
@ -743,6 +852,27 @@ namespace de4dot.code.deobfuscators.Confuser {
|
|||
return foundInvoke ? field : null;
|
||||
}
|
||||
|
||||
static bool findCallvirtChar(MethodDefinition method, out ushort callvirtChar) {
|
||||
var instrs = method.Body.Instructions;
|
||||
for (int index = 0; index < instrs.Count; index++) {
|
||||
index = ConfuserUtils.findCallMethod(instrs, index, Code.Callvirt, "System.Char System.String::get_Chars(System.Int32)");
|
||||
if (index < 0)
|
||||
break;
|
||||
|
||||
index++;
|
||||
if (index >= instrs.Count)
|
||||
break;
|
||||
|
||||
var ldci4 = instrs[index];
|
||||
if (!DotNetUtils.isLdcI4(ldci4))
|
||||
continue;
|
||||
callvirtChar = (ushort)DotNetUtils.getLdcI4Value(ldci4);
|
||||
return true;
|
||||
}
|
||||
callvirtChar = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
public void cleanUp() {
|
||||
if (!Detected)
|
||||
return;
|
||||
|
|
Loading…
Reference in New Issue
Block a user