Support Eazfuscator.NET 3.5 string encrypter
This commit is contained in:
parent
b8430ea2e3
commit
245d875d5f
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@ -153,6 +153,7 @@
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<Compile Include="deobfuscators\DeobUtils.cs" />
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<Compile Include="deobfuscators\DeobUtils.cs" />
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<Compile Include="deobfuscators\Dotfuscator\Deobfuscator.cs" />
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<Compile Include="deobfuscators\Dotfuscator\Deobfuscator.cs" />
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<Compile Include="deobfuscators\Dotfuscator\StringDecrypter.cs" />
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<Compile Include="deobfuscators\Dotfuscator\StringDecrypter.cs" />
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<Compile Include="deobfuscators\Eazfuscator_NET\Dynocode.cs" />
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<Compile Include="deobfuscators\MyPEImage.cs" />
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<Compile Include="deobfuscators\MyPEImage.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\v3\AntiStrongName.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\v3\AntiStrongName.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeDecrypter.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeDecrypter.cs" />
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@ -156,6 +156,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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if (CanRemoveStringDecrypterType) {
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if (CanRemoveStringDecrypterType) {
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addTypesToBeRemoved(stringDecrypter.Types, "String decrypter type");
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addTypesToBeRemoved(stringDecrypter.Types, "String decrypter type");
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addTypeToBeRemoved(decrypterType.Type, "Decrypter type");
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addTypeToBeRemoved(decrypterType.Type, "Decrypter type");
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addTypesToBeRemoved(stringDecrypter.DynocodeTypes, "Dynocode type");
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addResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
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addResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
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}
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}
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addTypeToBeRemoved(assemblyResolver.Type, "Assembly resolver type");
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addTypeToBeRemoved(assemblyResolver.Type, "Assembly resolver type");
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286
de4dot.code/deobfuscators/Eazfuscator_NET/Dynocode.cs
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286
de4dot.code/deobfuscators/Eazfuscator_NET/Dynocode.cs
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@ -0,0 +1,286 @@
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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.Collections.Generic;
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using dot10.DotNet;
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using dot10.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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interface IDynocodeGenerator {
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IEnumerable<int> getValues(int input);
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}
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// Something added in EF 3.5 which they call Dynocode. The string decrypter can now
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// call some iterator classes that will return some integers that it will use to
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// XOR some key.
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class Dynocode {
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ISimpleDeobfuscator simpleDeobfuscator;
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Dictionary<TypeDef, IDynocodeGenerator> typeToDCGen = new Dictionary<TypeDef, IDynocodeGenerator>();
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class DCGen1 : IDynocodeGenerator {
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public int magic1;
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public int magic2;
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public int magic3;
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public int magic4;
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public int magic5;
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public int magic6;
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public int magic7;
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public IEnumerable<int> getValues(int input) {
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yield return magic1;
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yield return magic2;
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yield return input ^ magic3;
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yield return magic4;
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yield return magic5;
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yield return magic6;
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yield return input ^ magic7;
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}
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}
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class DCGen2 : IDynocodeGenerator {
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public int magic1;
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public IEnumerable<int> getValues(int input) {
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int x = 0;
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int y = 1;
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while (true) {
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yield return y;
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if (--input == 0)
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break;
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int tmp = y;
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y = (x + y + input) ^ magic1;
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x = tmp;
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}
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}
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}
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class DCGen3 : IDynocodeGenerator {
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public int magic1;
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public int magic2;
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public DCGen2 dc2;
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public IEnumerable<int> getValues(int input) {
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int i = 7;
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foreach (var val in dc2.getValues(input)) {
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int x = val ^ input;
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if ((x % 4) == 0)
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x ^= magic1;
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if ((x % 16) == 0)
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x ^= magic2;
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yield return x;
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if (--i == 0)
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break;
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}
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}
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}
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public IEnumerable<TypeDef> Types {
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get { return typeToDCGen.Keys; }
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}
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public Dynocode(ISimpleDeobfuscator simpleDeobfuscator) {
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this.simpleDeobfuscator = simpleDeobfuscator;
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}
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public IDynocodeGenerator getDynocodeGenerator(TypeDef type) {
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if (type == null)
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return null;
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var dt = type.DeclaringType;
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if (dt == null)
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return null;
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IDynocodeGenerator dcGen;
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if (typeToDCGen.TryGetValue(type, out dcGen))
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return dcGen;
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if (dt.NestedTypes.Count == 1)
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dcGen = getDCGen1(type);
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else if (dt.NestedTypes.Count == 2)
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dcGen = getDCGen3(type);
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typeToDCGen[type] = dcGen;
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return dcGen;
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}
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DCGen1 getDCGen1(TypeDef type) {
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var method = getMoveNext(type);
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if (method == null)
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return null;
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simpleDeobfuscator.deobfuscate(method);
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var swLabels = getSwitchLabels(method);
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if (swLabels == null || swLabels.Count < 7)
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return null;
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var dcGen = new DCGen1();
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if (!getMagicDC1(method, swLabels[0], out dcGen.magic1))
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return null;
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if (!getMagicDC1(method, swLabels[1], out dcGen.magic2))
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return null;
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if (!getMagicXorDC1(method, swLabels[2], out dcGen.magic3))
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return null;
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if (!getMagicDC1(method, swLabels[3], out dcGen.magic4))
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return null;
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if (!getMagicDC1(method, swLabels[4], out dcGen.magic5))
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return null;
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if (!getMagicDC1(method, swLabels[5], out dcGen.magic6))
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return null;
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if (!getMagicXorDC1(method, swLabels[6], out dcGen.magic7))
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return null;
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return dcGen;
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}
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static IList<Instruction> getSwitchLabels(MethodDef method) {
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Switch)
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continue;
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return instr.Operand as IList<Instruction>;
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}
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return null;
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}
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static bool getMagicDC1(MethodDef method, Instruction target, out int magic) {
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magic = 0;
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var instrs = method.Body.Instructions;
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int index = instrs.IndexOf(target);
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if (index < 0)
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return false;
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for (int i = index; i < instrs.Count - 3; i++) {
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var instr = instrs[i];
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if (instr.OpCode.FlowControl != FlowControl.Next)
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return false;
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if (instr.OpCode.Code != Code.Stfld)
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continue;
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if (instrs[i + 1].OpCode.Code != Code.Ldarg_0)
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continue;
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var ldci4 = instrs[i + 2];
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if (!ldci4.IsLdcI4())
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continue;
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if (instrs[i + 3].OpCode.Code != Code.Stfld)
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continue;
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magic = ldci4.GetLdcI4Value();
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return true;
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}
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return false;
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}
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static bool getMagicXorDC1(MethodDef method, Instruction target, out int magic) {
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magic = 0;
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var instrs = method.Body.Instructions;
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int index = instrs.IndexOf(target);
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if (index < 0)
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return false;
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for (int i = index; i < instrs.Count - 2; i++) {
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var instr = instrs[i];
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if (instr.OpCode.FlowControl != FlowControl.Next)
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return false;
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if (!instr.IsLdcI4())
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continue;
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if (instrs[i + 1].OpCode.Code != Code.Xor)
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continue;
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if (instrs[i + 2].OpCode.Code != Code.Stfld)
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continue;
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magic = instr.GetLdcI4Value();
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return true;
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}
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return false;
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}
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DCGen3 getDCGen3(TypeDef type) {
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var method = getMoveNext(type);
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if (method == null)
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return null;
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simpleDeobfuscator.deobfuscate(method);
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var dcGen = new DCGen3();
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int index = 0;
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if (!getMagicDC3(method, ref index, out dcGen.magic1))
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return null;
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if (!getMagicDC3(method, ref index, out dcGen.magic2))
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return null;
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var dt = type.DeclaringType;
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dcGen.dc2 = getDCGen2(dt.NestedTypes[0] == type ? dt.NestedTypes[1] : dt.NestedTypes[0]);
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return dcGen;
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}
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static bool getMagicDC3(MethodDef method, ref int index, out int magic) {
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var instrs = method.Body.Instructions;
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for (int i = index; i < instrs.Count - 2; i++) {
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var ldci4 = instrs[i];
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if (!ldci4.IsLdcI4())
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continue;
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if (instrs[i + 1].OpCode.Code != Code.Xor)
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continue;
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if (instrs[i + 2].OpCode.Code != Code.Stfld)
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continue;
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index = i + 3;
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magic = ldci4.GetLdcI4Value();
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return true;
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}
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magic = 0;
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return false;
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}
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DCGen2 getDCGen2(TypeDef type) {
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var method = getMoveNext(type);
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if (method == null)
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return null;
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simpleDeobfuscator.deobfuscate(method);
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var dcGen = new DCGen2();
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int index = 0;
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if (!getMagicDC3(method, ref index, out dcGen.magic1))
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return null;
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return dcGen;
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}
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static MethodDef getMoveNext(TypeDef type) {
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foreach (var m in type.Methods) {
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if (!m.IsVirtual)
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continue;
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foreach (var mo in m.Overrides) {
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if (mo.MethodDeclaration.FullName == "System.Boolean System.Collections.IEnumerator::MoveNext()")
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return m;
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}
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}
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foreach (var m in type.Methods) {
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if (!m.IsVirtual)
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continue;
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if (m.Name != "MoveNext")
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continue;
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if (!DotNetUtils.isMethod(m, "System.Boolean", "()"))
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continue;
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return m;
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}
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return null;
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|
}
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}
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}
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@ -47,6 +47,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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EfConstantsReader stringMethodConsts;
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EfConstantsReader stringMethodConsts;
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bool isV32OrLater;
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bool isV32OrLater;
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int? validStringDecrypterValue;
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int? validStringDecrypterValue;
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Dynocode dynocode;
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|
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class StreamHelperType {
|
class StreamHelperType {
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public TypeDef type;
|
public TypeDef type;
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@ -99,6 +100,10 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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}
|
}
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}
|
}
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|
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public IEnumerable<TypeDef> DynocodeTypes {
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|
get { return dynocode.Types; }
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||||||
|
}
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|
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public MethodDef Method {
|
public MethodDef Method {
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||||||
get { return stringMethod; }
|
get { return stringMethod; }
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}
|
}
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@ -223,6 +228,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
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}
|
}
|
||||||
|
|
||||||
bool findConstants(ISimpleDeobfuscator simpleDeobfuscator) {
|
bool findConstants(ISimpleDeobfuscator simpleDeobfuscator) {
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||||||
|
dynocode = new Dynocode(simpleDeobfuscator);
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||||||
simpleDeobfuscator.deobfuscate(stringMethod);
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simpleDeobfuscator.deobfuscate(stringMethod);
|
||||||
stringMethodConsts = new EfConstantsReader(stringMethod);
|
stringMethodConsts = new EfConstantsReader(stringMethod);
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||||||
|
|
||||||
|
@ -630,6 +636,11 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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emu.push(new Int64Value((long)decrypterType.getMagic()));
|
emu.push(new Int64Value((long)decrypterType.getMagic()));
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break;
|
break;
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|
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case Code.Newobj:
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|
if (!emulateDynocode(emu, ref i))
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goto default;
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||||||
|
break;
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||||||
|
|
||||||
default:
|
default:
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||||||
if (instr.OpCode.FlowControl != FlowControl.Next)
|
if (instr.OpCode.FlowControl != FlowControl.Next)
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goto done;
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goto done;
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@ -649,6 +660,72 @@ done: ;
|
||||||
return false;
|
return false;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
bool emulateDynocode(InstructionEmulator emu, ref int index) {
|
||||||
|
var instrs = stringMethod.Body.Instructions;
|
||||||
|
var instr = instrs[index];
|
||||||
|
|
||||||
|
var ctor = instr.Operand as MethodDef;
|
||||||
|
if (ctor == null || ctor.MethodSig.GetParamCount() != 1 || ctor.MethodSig.Params[0].ElementType != ElementType.I4)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
if (index + 4 >= instrs.Count)
|
||||||
|
return false;
|
||||||
|
var ldloc = instrs[index + 3];
|
||||||
|
if (!ldloc.IsLdloc() || instrs[index + 4].OpCode.Code != Code.Stfld)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
var initValue = emu.getLocal(ldloc.GetLocal(stringMethod.Body.Variables)) as Int32Value;
|
||||||
|
if (initValue == null || !initValue.allBitsValid())
|
||||||
|
return false;
|
||||||
|
|
||||||
|
int leaveIndex = findLeave(instrs, index);
|
||||||
|
if (leaveIndex < 0)
|
||||||
|
return false;
|
||||||
|
var afterLoop = instrs[leaveIndex].Operand as Instruction;
|
||||||
|
if (afterLoop == null)
|
||||||
|
return false;
|
||||||
|
int newIndex = instrs.IndexOf(afterLoop);
|
||||||
|
var loopLocal = getDCLoopLocal(index, newIndex);
|
||||||
|
if (loopLocal == null)
|
||||||
|
return false;
|
||||||
|
var initValue2 = emu.getLocal(loopLocal) as Int32Value;
|
||||||
|
if (initValue2 == null || !initValue2.allBitsValid())
|
||||||
|
return false;
|
||||||
|
|
||||||
|
var dcGen = dynocode.getDynocodeGenerator(ctor.DeclaringType);
|
||||||
|
if (dcGen == null)
|
||||||
|
return false;
|
||||||
|
int loopLocalValue = initValue2.value;
|
||||||
|
foreach (var val in dcGen.getValues(initValue.value))
|
||||||
|
loopLocalValue ^= val;
|
||||||
|
|
||||||
|
emu.setLocal(loopLocal, new Int32Value(loopLocalValue));
|
||||||
|
emu.emulate(instr);
|
||||||
|
index = newIndex - 1;
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
Local getDCLoopLocal(int start, int end) {
|
||||||
|
var instrs = stringMethod.Body.Instructions;
|
||||||
|
for (int i = start; i < end - 1; i++) {
|
||||||
|
if (instrs[i].OpCode.Code != Code.Xor)
|
||||||
|
continue;
|
||||||
|
var stloc = instrs[i + 1];
|
||||||
|
if (!stloc.IsStloc())
|
||||||
|
continue;
|
||||||
|
return stloc.GetLocal(stringMethod.Body.Variables);
|
||||||
|
}
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int findLeave(IList<Instruction> instrs, int index) {
|
||||||
|
for (int i = index; i < instrs.Count; i++) {
|
||||||
|
if (instrs[i].OpCode.Code == Code.Leave_S || instrs[i].OpCode.Code == Code.Leave)
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
static int findInitIntsIndex(MethodDef method, out bool initializedAll) {
|
static int findInitIntsIndex(MethodDef method, out bool initializedAll) {
|
||||||
initializedAll = false;
|
initializedAll = false;
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue
Block a user