Port .NET Reactor v3.x deobfuscator

This commit is contained in:
de4dot 2012-11-17 15:46:02 +01:00
parent 7e1d16dafb
commit 413a032e0a
12 changed files with 210 additions and 76 deletions

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@ -198,7 +198,7 @@ namespace de4dot.code {
module = assemblyModule.load(unpackedData);
}
catch {
Logger.w("Could not load unpacked data. Deobfuscator: {0}", deob.TypeLong);
Logger.w("Could not load unpacked data. File: {0}, deobfuscator: {0}", peImage.FileName ?? "(unknown filename)", deob.TypeLong);
continue;
}
this.deob = deob;

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@ -153,16 +153,16 @@
<Compile Include="deobfuscators\DeobUtils.cs" />
<Compile Include="deobfuscators\Dotfuscator\Deobfuscator.cs" />
<Compile Include="deobfuscators\Dotfuscator\StringDecrypter.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\AntiStrongName.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeDecrypter.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeUnpacker.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\AssemblyResolver.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\DecrypterType.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\DecryptMethod.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\Deobfuscator.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\LibAssemblyResolver.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\MemoryPatcher.cs" />
<None Include="deobfuscators\dotNET_Reactor\v3\NativeLibSaver.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\AntiStrongName.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeDecrypter.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeUnpacker.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\AssemblyResolver.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\DecrypterType.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\DecryptMethod.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\Deobfuscator.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\LibAssemblyResolver.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\MemoryPatcher.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\v3\NativeLibSaver.cs" />
<None Include="deobfuscators\dotNET_Reactor\v4\AntiStrongName.cs" />
<None Include="deobfuscators\dotNET_Reactor\v4\AssemblyResolver.cs" />
<None Include="deobfuscators\dotNET_Reactor\v4\BooleanDecrypter.cs" />

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@ -633,6 +633,10 @@ namespace de4dot.code.deobfuscators {
if (field != null)
return field.FieldSig.GetFieldType().GetElementType() == ElementType.Object;
var sig = o as TypeSig;
if (sig != null)
return sig.ElementType == ElementType.Object;
throw new ApplicationException(string.Format("Unknown type: {0}", o.GetType()));
}
}

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@ -120,7 +120,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
static bool checkCall(Instr instr, string methodFullname) {
if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt)
return false;
var calledMethod = instr.Operand as MethodReference;
var calledMethod = instr.Operand as IMethod;
if (calledMethod == null)
return false;
return calledMethod.ToString() == methodFullname;
@ -129,13 +129,13 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
static bool checkCall(Instr instr, string returnType, string parameters) {
if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt)
return false;
var calledMethod = instr.Operand as MethodReference;
var calledMethod = instr.Operand as IMethod;
if (calledMethod == null)
return false;
return DotNetUtils.isMethod(calledMethod, returnType, parameters);
}
static bool checkLdloc(IList<VariableDefinition> locals, Instr instr, VariableDefinition local) {
static bool checkLdloc(IList<Local> locals, Instr instr, Local local) {
if (!instr.isLdloc())
return false;
if (Instr.getLocalVar(locals, instr) != local)
@ -143,7 +143,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
return true;
}
static bool checkStloc(IList<VariableDefinition> locals, Instr instr, VariableDefinition local) {
static bool checkStloc(IList<Local> locals, Instr instr, Local local) {
if (!instr.isStloc())
return false;
if (Instr.getLocalVar(locals, instr) != local)

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@ -23,7 +23,7 @@ using de4dot.blocks.cflow;
namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
class ApplicationModeDecrypter {
ModuleDefinition module;
ModuleDefMD module;
AssemblyResolver assemblyResolver;
MemoryPatcher memoryPatcher;
@ -43,7 +43,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
get { return assemblyResolver != null; }
}
public ApplicationModeDecrypter(ModuleDefinition module) {
public ApplicationModeDecrypter(ModuleDefMD module) {
this.module = module;
find();
}

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@ -22,10 +22,137 @@ using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using dot10.IO;
using dot10.PE;
using dot10.DotNet;
using de4dot.PE;
using dot10.DotNet.MD;
namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
sealed class MyPEImage : IDisposable {
IPEImage peImage;
byte[] peImageData;
IImageStream peStream;
DotNetFile dnFile;
ImageSectionHeader dotNetSection;
bool ownPeImage;
public IPEImage PEImage {
get { return peImage; }
}
public uint Length {
get { return (uint)peStream.Length; }
}
public MyPEImage(IPEImage peImage) {
initialize(peImage);
}
public MyPEImage(byte[] peImageData) {
this.ownPeImage = true;
this.peImageData = peImageData;
initialize(new PEImage(peImageData));
}
void initialize(IPEImage peImage) {
this.peImage = peImage;
this.peStream = peImage.CreateFullStream();
//TODO: Only init this if they use the .NET MD
var dotNetDir = peImage.ImageNTHeaders.OptionalHeader.DataDirectories[14];
if (dotNetDir.VirtualAddress != 0 && dotNetDir.Size >= 0x48) {
dnFile = DotNetFile.Load(peImage, false);
dotNetSection = findSection(dotNetDir.VirtualAddress);
}
}
ImageSectionHeader findSection(RVA rva) {
foreach (var section in peImage.ImageSectionHeaders) {
if (section.VirtualAddress <= rva && rva < section.VirtualAddress + Math.Max(section.VirtualSize, section.SizeOfRawData))
return section;
}
return null;
}
static bool isInside(ImageSectionHeader section, uint offset, uint length) {
return offset >= section.PointerToRawData && offset + length <= section.PointerToRawData + section.SizeOfRawData;
}
public void offsetWriteUInt32(uint offset, uint val) {
peImageData[offset + 0] = (byte)val;
peImageData[offset + 1] = (byte)(val >> 8);
peImageData[offset + 2] = (byte)(val >> 16);
peImageData[offset + 3] = (byte)(val >> 24);
}
public void offsetWriteUInt16(uint offset, ushort val) {
peImageData[offset + 0] = (byte)val;
peImageData[offset + 1] = (byte)(val >> 8);
}
public uint offsetReadUInt32(uint offset) {
peStream.Position = offset;
return peStream.ReadUInt32();
}
public ushort offsetReadUInt16(uint offset) {
peStream.Position = offset;
return peStream.ReadUInt16();
}
public byte[] offsetReadBytes(uint offset, int size) {
peStream.Position = offset;
return peStream.ReadBytes(size);
}
public void offsetWrite(uint offset, byte[] data) {
Array.Copy(data, 0, peImageData, offset, data.Length);
}
bool intersect(uint offset1, uint length1, uint offset2, uint length2) {
return !(offset1 + length1 <= offset2 || offset2 + length2 <= offset1);
}
bool intersect(uint offset, uint length, IFileSection location) {
return intersect(offset, length, (uint)location.StartOffset, (uint)(location.EndOffset - location.StartOffset));
}
public bool dotNetSafeWriteOffset(uint offset, byte[] data) {
if (dnFile != null) {
uint length = (uint)data.Length;
if (!isInside(dotNetSection, offset, length))
return false;
if (intersect(offset, length, dnFile.MetaData.ImageCor20Header))
return false;
if (intersect(offset, length, (uint)dnFile.MetaData.TablesStream.FileOffset, dnFile.MetaData.TablesStream.HeaderLength))
return false;
}
offsetWrite(offset, data);
return true;
}
public bool dotNetSafeWrite(uint rva, byte[] data) {
return dotNetSafeWriteOffset((uint)peImage.ToFileOffset((RVA)rva), data);
}
public void Dispose() {
if (ownPeImage) {
if (dnFile != null)
dnFile.Dispose();
if (peImage != null)
peImage.Dispose();
}
if (peStream != null)
peStream.Dispose();
dnFile = null;
peImage = null;
peStream = null;
}
}
class IniFile {
Dictionary<string, string> nameToValue = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
@ -77,7 +204,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
0x73, 0x33, 0x6E, 0x6D, 0x34, 0x32, 0x64, 0x35,
};
PeImage peImage;
IPEImage peImage;
List<UnpackedFile> satelliteAssemblies = new List<UnpackedFile>();
uint[] sizes;
string[] filenames;
@ -87,29 +214,35 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
get { return satelliteAssemblies; }
}
public ApplicationModeUnpacker(PeImage peImage) {
public ApplicationModeUnpacker(IPEImage peImage) {
this.peImage = peImage;
}
public byte[] unpack() {
byte[] data = null;
MyPEImage myPeImage = null;
try {
data = unpack2();
myPeImage = new MyPEImage(peImage);
data = unpack2(myPeImage);
}
catch {
}
finally {
if (myPeImage != null)
myPeImage.Dispose();
}
if (data != null)
return data;
if (shouldUnpack)
Logger.w("Could not unpack the file");
Logger.w("Could not unpack file: {0}", peImage.FileName ?? "(unknown filename)");
return null;
}
byte[] unpack2() {
byte[] unpack2(MyPEImage peImage) {
shouldUnpack = false;
uint headerOffset = peImage.ImageLength - 12;
uint offsetEncryptedAssembly = checkOffset(peImage.offsetReadUInt32(headerOffset));
uint headerOffset = (uint)peImage.Length - 12;
uint offsetEncryptedAssembly = checkOffset(peImage, peImage.offsetReadUInt32(headerOffset));
uint ezencryptionLibLength = peImage.offsetReadUInt32(headerOffset + 4);
uint iniFileLength = peImage.offsetReadUInt32(headerOffset + 8);
@ -135,30 +268,31 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
return null;
byte[] ezencryptionLibData = decompress1(peImage.offsetReadBytes(ezencryptionLibOffset, (int)ezencryptionLibLength));
var ezencryptionLibModule = ModuleDefinition.ReadModule(new MemoryStream(ezencryptionLibData));
var ezencryptionLibModule = ModuleDefMD.Load(ezencryptionLibData);
var decrypter = new ApplicationModeDecrypter(ezencryptionLibModule);
if (!decrypter.Detected)
return null;
var mainAssembly = unpackEmbeddedFile(0, decrypter);
var mainAssembly = unpackEmbeddedFile(peImage, 0, decrypter);
decrypter.MemoryPatcher.patch(mainAssembly.data);
for (int i = 1; i < filenames.Length; i++)
satelliteAssemblies.Add(unpackEmbeddedFile(i, decrypter));
satelliteAssemblies.Add(unpackEmbeddedFile(peImage, i, decrypter));
clearDllBit(mainAssembly.data);
return mainAssembly.data;
}
static void clearDllBit(byte[] peImageData) {
var mainPeImage = new PeImage(peImageData);
uint characteristicsOffset = mainPeImage.FileHeaderOffset + 18;
ushort characteristics = mainPeImage.offsetReadUInt16(characteristicsOffset);
characteristics &= 0xDFFF;
characteristics |= 2;
mainPeImage.offsetWriteUInt16(characteristicsOffset, characteristics);
using (var mainPeImage = new MyPEImage(peImageData)) {
uint characteristicsOffset = (uint)mainPeImage.PEImage.ImageNTHeaders.FileHeader.StartOffset + 18;
ushort characteristics = mainPeImage.offsetReadUInt16(characteristicsOffset);
characteristics &= 0xDFFF;
characteristics |= 2;
mainPeImage.offsetWriteUInt16(characteristicsOffset, characteristics);
}
}
UnpackedFile unpackEmbeddedFile(int index, ApplicationModeDecrypter decrypter) {
UnpackedFile unpackEmbeddedFile(MyPEImage peImage, int index, ApplicationModeDecrypter decrypter) {
uint offset = 0;
for (int i = 0; i < index + 1; i++)
offset += sizes[i];
@ -178,8 +312,8 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
return list.ToArray();
}
uint checkOffset(uint offset) {
if (offset >= peImage.ImageLength)
uint checkOffset(MyPEImage peImage, uint offset) {
if (offset >= peImage.Length)
throw new Exception();
return offset;
}

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@ -27,12 +27,12 @@ using de4dot.PE;
namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
// Find the type that decrypts strings and calls the native lib
class DecrypterType {
ModuleDefinition module;
ModuleDefMD module;
TypeDef decrypterType;
MethodDef stringDecrypter1;
MethodDef stringDecrypter2;
List<MethodDef> initMethods = new List<MethodDef>();
List<ModuleReference> moduleReferences = new List<ModuleReference>();
List<ModuleRef> moduleReferences = new List<ModuleRef>();
Resource linkedResource;
public bool Detected {
@ -59,10 +59,6 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
get { return initMethods; }
}
public List<ModuleReference> ModuleReferences {
get { return moduleReferences; }
}
public IEnumerable<MethodDef> StringDecrypters {
get {
return new List<MethodDef> {
@ -72,11 +68,11 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
}
}
public DecrypterType(ModuleDefinition module) {
public DecrypterType(ModuleDefMD module) {
this.module = module;
}
public DecrypterType(ModuleDefinition module, DecrypterType oldOne) {
public DecrypterType(ModuleDefMD module, DecrypterType oldOne) {
this.module = module;
this.decrypterType = lookup(oldOne.decrypterType, "Could not find decrypterType");
this.stringDecrypter1 = lookup(oldOne.stringDecrypter1, "Could not find stringDecrypter1");
@ -109,11 +105,11 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
void updateModuleReferences() {
foreach (var method in decrypterType.Methods) {
if (method.PInvokeInfo != null) {
switch (method.PInvokeInfo.EntryPoint) {
if (method.ImplMap != null) {
switch (method.ImplMap.Name.String) {
case "nr_nli":
case "nr_startup":
moduleReferences.Add(method.PInvokeInfo.Module);
moduleReferences.Add(method.ImplMap.Module);
break;
}
}
@ -123,7 +119,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
void updateLinkedResource() {
foreach (var modref in moduleReferences) {
var resource = DotNetUtils.getResource(module, modref.Name) as LinkedResource;
var resource = DotNetUtils.getResource(module, modref.Name.String) as LinkedResource;
if (resource == null)
continue;
@ -133,7 +129,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
}
MethodDef getStringDecrypter(TypeDef type, string name) {
var method = DotNetUtils.getMethod(type, name);
var method = type.FindMethod(name);
if (method == null)
return null;
if (!DotNetUtils.isMethod(method, "System.String", "(System.String)"))
@ -152,9 +148,10 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
return Encoding.Unicode.GetString(Convert.FromBase64String(s));
}
public bool patch(PeImage peImage) {
public bool patch(byte[] peData) {
try {
return patch2(peImage);
using (var peImage = new MyPEImage(peData))
return patch2(peImage);
}
catch {
Logger.w("Could not patch the file");
@ -162,9 +159,9 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
}
}
bool patch2(PeImage peImage) {
uint numPatches = peImage.offsetReadUInt32(peImage.ImageLength - 4);
uint offset = checked(peImage.ImageLength - 4 - numPatches * 8);
bool patch2(MyPEImage peImage) {
uint numPatches = peImage.offsetReadUInt32(peImage.Length - 4);
uint offset = checked(peImage.Length - 4 - numPatches * 8);
bool startedPatchingBadData = false;
for (uint i = 0; i < numPatches; i++, offset += 8) {

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@ -21,11 +21,11 @@ using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using dot10.IO;
using dot10.PE;
using dot10.DotNet;
using dot10.DotNet.Emit;
using Mono.MyStuff;
using de4dot.blocks;
using de4dot.PE;
namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
public class DeobfuscatorInfo : DeobfuscatorInfoBase {
@ -125,7 +125,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
this.RenamingOptions &= ~RenamingOptions.RemoveNamespaceIfOneType;
}
public override byte[] unpackNativeFile(PeImage peImage) {
public override byte[] unpackNativeFile(IPEImage peImage) {
var unpacker = new ApplicationModeUnpacker(peImage);
var data = unpacker.unpack();
if (data == null)
@ -146,15 +146,14 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
return false;
var fileData = ModuleBytes ?? DeobUtils.readModule(module);
var peImage = new PeImage(fileData);
if (!decrypterType.patch(peImage))
if (!decrypterType.patch(fileData))
return false;
newFileData = fileData;
return true;
}
public override IDeobfuscator moduleReloaded(ModuleDefinition module) {
public override IDeobfuscator moduleReloaded(ModuleDefMD module) {
var newOne = new Deobfuscator(options);
newOne.setModule(module);
newOne.decrypterType = new DecrypterType(module, decrypterType);
@ -162,7 +161,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
return newOne;
}
public override void init(ModuleDefinition module) {
public override void init(ModuleDefMD module) {
base.init(module);
}
@ -298,7 +297,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
void dumpResourceFiles() {
foreach (var resource in libAssemblyResolver.Resources) {
var mod = ModuleDefinition.ReadModule(resource.GetResourceStream());
var mod = ModuleDefMD.Load(resource.Data.ReadAllBytes());
addResourceToBeRemoved(resource, string.Format("Embedded assembly: {0}", mod.Assembly.FullName));
DeobfuscatedFile.createAssemblyFile(resource.GetResourceData(),
Utils.getAssemblySimpleName(mod.Assembly.FullName),
@ -324,7 +323,6 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
if (canRemoveDecrypterType && !isTypeCalled(decrypterType.Type)) {
addTypeToBeRemoved(decrypterType.Type, "Decrypter type");
addModuleReferencesToBeRemoved(decrypterType.ModuleReferences, "Native lib module reference");
addResourceToBeRemoved(decrypterType.LinkedResource, "Native lib linked resource");
}

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@ -25,7 +25,7 @@ using de4dot.blocks;
namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
// Find the assembly resolver that's used in lib mode (3.8+)
class LibAssemblyResolver {
ModuleDefinition module;
ModuleDefMD module;
MethodDef initMethod;
List<EmbeddedResource> resources = new List<EmbeddedResource>();
@ -41,7 +41,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
get { return resources; }
}
public LibAssemblyResolver(ModuleDefinition module) {
public LibAssemblyResolver(ModuleDefMD module) {
this.module = module;
}
@ -69,7 +69,7 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
var type = method.DeclaringType;
if (!new FieldTypes(type).exactly(requiredFields))
continue;
var ctor = DotNetUtils.getMethod(type, ".ctor");
var ctor = type.FindMethod(".ctor");
if (ctor == null)
continue;
var handler = DeobUtils.getResolveMethod(ctor);

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@ -135,10 +135,11 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
}
public void patch(byte[] peImageData) {
var peImage = new PeImage(peImageData);
foreach (var info in patchInfos) {
for (int i = 0; i < info.offsets.Length; i++)
peImage.dotNetSafeWriteOffset((uint)info.offsets[i], BitConverter.GetBytes(info.values[i]));
using (var peImage = new MyPEImage(peImageData)) {
foreach (var info in patchInfos) {
for (int i = 0; i < info.offsets.Length; i++)
peImage.dotNetSafeWriteOffset((uint)info.offsets[i], BitConverter.GetBytes(info.values[i]));
}
}
}
}

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@ -24,7 +24,7 @@ using de4dot.blocks;
namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
// Finds the type that saves the native lib (if in resources) to disk
class NativeLibSaver {
ModuleDefinition module;
ModuleDefMD module;
TypeDef nativeLibCallerType;
MethodDef initMethod;
Resource nativeFileResource;
@ -45,16 +45,16 @@ namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
get { return nativeLibCallerType != null; }
}
public NativeLibSaver(ModuleDefinition module) {
public NativeLibSaver(ModuleDefMD module) {
this.module = module;
}
public NativeLibSaver(ModuleDefinition module, NativeLibSaver oldOne) {
public NativeLibSaver(ModuleDefMD module, NativeLibSaver oldOne) {
this.module = module;
this.nativeLibCallerType = lookup(oldOne.nativeLibCallerType, "Could not find nativeLibCallerType");
this.initMethod = lookup(oldOne.initMethod, "Could not find initMethod");
if (oldOne.nativeFileResource != null) {
this.nativeFileResource = DotNetUtils.getResource(module, oldOne.nativeFileResource.Name);
this.nativeFileResource = DotNetUtils.getResource(module, oldOne.nativeFileResource.Name.String);
if (this.nativeFileResource == null)
throw new ApplicationException("Could not find nativeFileResource");
}

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@ -46,8 +46,8 @@ namespace de4dot.cui {
new de4dot.code.deobfuscators.CryptoObfuscator.DeobfuscatorInfo(),
new de4dot.code.deobfuscators.DeepSea.DeobfuscatorInfo(),
new de4dot.code.deobfuscators.Dotfuscator.DeobfuscatorInfo(),
#if PORT
new de4dot.code.deobfuscators.dotNET_Reactor.v3.DeobfuscatorInfo(),
#if PORT
new de4dot.code.deobfuscators.dotNET_Reactor.v4.DeobfuscatorInfo(),
new de4dot.code.deobfuscators.Eazfuscator_NET.DeobfuscatorInfo(),
new de4dot.code.deobfuscators.Goliath_NET.DeobfuscatorInfo(),