300 lines
9.7 KiB
C#
300 lines
9.7 KiB
C#
/*
|
|
Copyright (C) 2011-2012 de4dot@gmail.com
|
|
|
|
This file is part of de4dot.
|
|
|
|
de4dot is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
de4dot is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using System.Collections.Generic;
|
|
using Mono.Cecil;
|
|
using de4dot.blocks;
|
|
using de4dot.blocks.cflow;
|
|
|
|
namespace de4dot.code.deobfuscators.DeepSea {
|
|
public class DeobfuscatorInfo : DeobfuscatorInfoBase {
|
|
public const string THE_NAME = "DeepSea";
|
|
public const string THE_TYPE = "ds";
|
|
BoolOption inlineMethods;
|
|
BoolOption removeInlinedMethods;
|
|
BoolOption decryptResources;
|
|
BoolOption dumpEmbeddedAssemblies;
|
|
BoolOption restoreFields;
|
|
BoolOption renameResourceKeys;
|
|
BoolOption castDeobfuscation;
|
|
|
|
public DeobfuscatorInfo()
|
|
: base() {
|
|
inlineMethods = new BoolOption(null, makeArgName("inline"), "Inline short methods", true);
|
|
removeInlinedMethods = new BoolOption(null, makeArgName("remove-inlined"), "Remove inlined methods", true);
|
|
decryptResources = new BoolOption(null, makeArgName("rsrc"), "Decrypt resources", true);
|
|
dumpEmbeddedAssemblies = new BoolOption(null, makeArgName("embedded"), "Dump embedded assemblies", true);
|
|
restoreFields = new BoolOption(null, makeArgName("fields"), "Restore fields", true);
|
|
renameResourceKeys = new BoolOption(null, makeArgName("keys"), "Rename resource keys", true);
|
|
castDeobfuscation = new BoolOption(null, makeArgName("cast"), "Deobfuscate casts", true);
|
|
}
|
|
|
|
public override string Name {
|
|
get { return THE_NAME; }
|
|
}
|
|
|
|
public override string Type {
|
|
get { return THE_TYPE; }
|
|
}
|
|
|
|
public override IDeobfuscator createDeobfuscator() {
|
|
return new Deobfuscator(new Deobfuscator.Options {
|
|
ValidNameRegex = validNameRegex.get(),
|
|
InlineMethods = inlineMethods.get(),
|
|
RemoveInlinedMethods = removeInlinedMethods.get(),
|
|
DecryptResources = decryptResources.get(),
|
|
DumpEmbeddedAssemblies = dumpEmbeddedAssemblies.get(),
|
|
RestoreFields = restoreFields.get(),
|
|
RenameResourceKeys = renameResourceKeys.get(),
|
|
CastDeobfuscation = castDeobfuscation.get(),
|
|
});
|
|
}
|
|
|
|
protected override IEnumerable<Option> getOptionsInternal() {
|
|
return new List<Option>() {
|
|
inlineMethods,
|
|
removeInlinedMethods,
|
|
decryptResources,
|
|
dumpEmbeddedAssemblies,
|
|
restoreFields,
|
|
renameResourceKeys,
|
|
castDeobfuscation,
|
|
};
|
|
}
|
|
}
|
|
|
|
class Deobfuscator : DeobfuscatorBase {
|
|
Options options;
|
|
string obfuscatorName = DeobfuscatorInfo.THE_NAME;
|
|
bool startedDeobfuscating = false;
|
|
|
|
StringDecrypter stringDecrypter;
|
|
ResourceResolver resourceResolver;
|
|
AssemblyResolver assemblyResolver;
|
|
FieldsRestorer fieldsRestorer;
|
|
ArrayBlockDeobfuscator arrayBlockDeobfuscator;
|
|
|
|
internal class Options : OptionsBase {
|
|
public bool InlineMethods { get; set; }
|
|
public bool RemoveInlinedMethods { get; set; }
|
|
public bool DecryptResources { get; set; }
|
|
public bool DumpEmbeddedAssemblies { get; set; }
|
|
public bool RestoreFields { get; set; }
|
|
public bool RenameResourceKeys { get; set; }
|
|
public bool CastDeobfuscation { get; set; }
|
|
}
|
|
|
|
public override string Type {
|
|
get { return DeobfuscatorInfo.THE_TYPE; }
|
|
}
|
|
|
|
public override string TypeLong {
|
|
get { return DeobfuscatorInfo.THE_NAME; }
|
|
}
|
|
|
|
public override string Name {
|
|
get { return obfuscatorName; }
|
|
}
|
|
|
|
protected override bool CanInlineMethods {
|
|
get { return startedDeobfuscating ? options.InlineMethods : true; }
|
|
}
|
|
|
|
public override IEnumerable<IBlocksDeobfuscator> BlocksDeobfuscators {
|
|
get {
|
|
var list = new List<IBlocksDeobfuscator>(getBlocksDeobfuscators());
|
|
if (CanInlineMethods)
|
|
list.Add(new DsMethodCallInliner(new CachedCflowDeobfuscator(getBlocksDeobfuscators())));
|
|
return list;
|
|
}
|
|
}
|
|
|
|
List<IBlocksDeobfuscator> getBlocksDeobfuscators() {
|
|
var list = new List<IBlocksDeobfuscator>();
|
|
if (arrayBlockDeobfuscator.Detected)
|
|
list.Add(arrayBlockDeobfuscator);
|
|
if (!startedDeobfuscating || options.CastDeobfuscation)
|
|
list.Add(new CastDeobfuscator());
|
|
return list;
|
|
}
|
|
|
|
public Deobfuscator(Options options)
|
|
: base(options) {
|
|
this.options = options;
|
|
|
|
if (options.RenameResourceKeys)
|
|
this.RenamingOptions |= RenamingOptions.RenameResourceKeys;
|
|
else
|
|
this.RenamingOptions &= ~RenamingOptions.RenameResourceKeys;
|
|
}
|
|
|
|
protected override int detectInternal() {
|
|
int val = 0;
|
|
|
|
int sum = toInt32(stringDecrypter.Detected) +
|
|
toInt32(resourceResolver.Detected) +
|
|
toInt32(assemblyResolver.Detected);
|
|
if (sum > 0)
|
|
val += 100 + 10 * (sum - 1);
|
|
|
|
return val;
|
|
}
|
|
|
|
protected override void scanForObfuscator() {
|
|
staticStringInliner.UseUnknownArgs = true;
|
|
arrayBlockDeobfuscator = new ArrayBlockDeobfuscator(module);
|
|
arrayBlockDeobfuscator.init();
|
|
stringDecrypter = new StringDecrypter(module);
|
|
stringDecrypter.find(DeobfuscatedFile);
|
|
resourceResolver = new ResourceResolver(module, DeobfuscatedFile, this);
|
|
resourceResolver.find();
|
|
assemblyResolver = new AssemblyResolver(module, DeobfuscatedFile, this);
|
|
assemblyResolver.find();
|
|
obfuscatorName = detectVersion();
|
|
}
|
|
|
|
string detectVersion() {
|
|
switch (stringDecrypter.Version) {
|
|
case StringDecrypter.DecrypterVersion.V1_3:
|
|
if (detectMethodProxyObfuscation())
|
|
return DeobfuscatorInfo.THE_NAME + " 3.5";
|
|
return DeobfuscatorInfo.THE_NAME + " 1.x-3.x";
|
|
case StringDecrypter.DecrypterVersion.V4_0:
|
|
return DeobfuscatorInfo.THE_NAME + " 4.0";
|
|
case StringDecrypter.DecrypterVersion.V4_1:
|
|
return DeobfuscatorInfo.THE_NAME + " 4.1";
|
|
}
|
|
|
|
return DeobfuscatorInfo.THE_NAME;
|
|
}
|
|
|
|
bool detectMethodProxyObfuscation() {
|
|
const int MIN_FOUND_PROXIES = 10;
|
|
|
|
int foundProxies = 0, checkedMethods = 0;
|
|
foreach (var type in module.GetTypes()) {
|
|
foreach (var method in type.Methods) {
|
|
if (foundProxies >= MIN_FOUND_PROXIES)
|
|
goto done;
|
|
if (!method.IsStatic || method.Body == null)
|
|
continue;
|
|
if (checkedMethods++ >= 1000)
|
|
goto done;
|
|
if (!DsMethodCallInliner.canInline(method))
|
|
continue;
|
|
foundProxies++;
|
|
}
|
|
}
|
|
done:
|
|
return foundProxies >= MIN_FOUND_PROXIES;
|
|
}
|
|
|
|
public override void deobfuscateBegin() {
|
|
base.deobfuscateBegin();
|
|
|
|
if (options.RestoreFields) {
|
|
fieldsRestorer = new FieldsRestorer(module);
|
|
fieldsRestorer.initialize();
|
|
}
|
|
|
|
foreach (var method in stringDecrypter.DecrypterMethods) {
|
|
staticStringInliner.add(method, (method2, args) => {
|
|
return stringDecrypter.decrypt(method2, args);
|
|
});
|
|
}
|
|
DeobfuscatedFile.stringDecryptersAdded();
|
|
|
|
resourceResolver.initialize();
|
|
decryptResources();
|
|
|
|
dumpEmbeddedAssemblies();
|
|
|
|
startedDeobfuscating = true;
|
|
}
|
|
|
|
void decryptResources() {
|
|
if (!options.DecryptResources)
|
|
return;
|
|
EmbeddedResource rsrc;
|
|
if (!resourceResolver.mergeResources(out rsrc))
|
|
return;
|
|
addResourceToBeRemoved(rsrc, "Encrypted resources");
|
|
addCctorInitCallToBeRemoved(resourceResolver.InitMethod);
|
|
addCallToBeRemoved(module.EntryPoint, resourceResolver.InitMethod);
|
|
addMethodToBeRemoved(resourceResolver.InitMethod, "Resource resolver init method");
|
|
addMethodToBeRemoved(resourceResolver.InitMethod2, "Resource resolver init method #2");
|
|
addMethodToBeRemoved(resourceResolver.HandlerMethod, "Resource resolver handler method");
|
|
addMethodToBeRemoved(resourceResolver.GetDataMethod, "Resource resolver 'get resource data' method");
|
|
}
|
|
|
|
void dumpEmbeddedAssemblies() {
|
|
if (!options.DumpEmbeddedAssemblies)
|
|
return;
|
|
foreach (var info in assemblyResolver.getAssemblyInfos()) {
|
|
if (info.resource != null && info.resource == resourceResolver.Resource)
|
|
continue;
|
|
DeobfuscatedFile.createAssemblyFile(info.data, info.simpleName, info.extension);
|
|
addResourceToBeRemoved(info.resource, string.Format("Embedded assembly: {0}", info.fullName));
|
|
}
|
|
addCctorInitCallToBeRemoved(assemblyResolver.InitMethod);
|
|
addCallToBeRemoved(module.EntryPoint, assemblyResolver.InitMethod);
|
|
addMethodToBeRemoved(assemblyResolver.InitMethod, "Assembly resolver init method");
|
|
addMethodToBeRemoved(assemblyResolver.HandlerMethod, "Assembly resolver handler method");
|
|
addMethodToBeRemoved(assemblyResolver.DecryptMethod, "Assembly resolver decrypt method");
|
|
}
|
|
|
|
public override void deobfuscateMethodEnd(Blocks blocks) {
|
|
if (options.RestoreFields)
|
|
fieldsRestorer.deobfuscate(blocks);
|
|
base.deobfuscateMethodEnd(blocks);
|
|
}
|
|
|
|
public override void deobfuscateEnd() {
|
|
if (options.RestoreFields)
|
|
fieldsRestorer.cleanUp();
|
|
removeInlinedMethods();
|
|
|
|
if (options.RestoreFields)
|
|
addTypesToBeRemoved(fieldsRestorer.FieldStructs, "Type with moved fields");
|
|
|
|
if (CanRemoveStringDecrypterType) {
|
|
addMethodsToBeRemoved(stringDecrypter.DecrypterMethods, "String decrypter method");
|
|
stringDecrypter.cleanup();
|
|
}
|
|
|
|
addFieldsToBeRemoved(arrayBlockDeobfuscator.cleanUp(), "Control flow obfuscation array");
|
|
|
|
base.deobfuscateEnd();
|
|
}
|
|
|
|
void removeInlinedMethods() {
|
|
if (!options.InlineMethods || !options.RemoveInlinedMethods)
|
|
return;
|
|
removeInlinedMethods(DsInlinedMethodsFinder.find(module, staticStringInliner.Methods));
|
|
}
|
|
|
|
public override IEnumerable<int> getStringDecrypterMethods() {
|
|
var list = new List<int>();
|
|
foreach (var method in stringDecrypter.DecrypterMethods)
|
|
list.Add(method.MetadataToken.ToInt32());
|
|
return list;
|
|
}
|
|
}
|
|
}
|