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Move common code to BabelUtils

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This commit is contained in:
de4dot 2012-01-18 07:38:35 +01:00
parent ed31063b1b
commit 6ec1222657
6 changed files with 92 additions and 97 deletions
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1
de4dot.code/de4dot.code.csproj
View File

@ -58,6 +58,7 @@
<Compile Include="AssemblyClient\SameAppDomainAssemblyServerLoader.cs" />
<Compile Include="AssemblyResolver.cs" />
<Compile Include="deobfuscators\ArrayFinder.cs" />
<Compile Include="deobfuscators\Babel_NET\BabelUtils.cs" />
<Compile Include="deobfuscators\Babel_NET\ConstantsDecrypter.cs" />
<Compile Include="deobfuscators\Babel_NET\Deobfuscator.cs" />
<Compile Include="deobfuscators\Babel_NET\ImageReader.cs" />

86
de4dot.code/deobfuscators/Babel_NET/BabelUtils.cs Normal file
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@ -0,0 +1,86 @@
/*
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 Mono.Cecil;
using Mono.Cecil.Cil;
using de4dot.blocks;
namespace de4dot.code.deobfuscators.Babel_NET {
static class BabelUtils {
public static EmbeddedResource findEmbeddedResource(ModuleDefinition module, TypeDefinition decrypterType) {
return findEmbeddedResource(module, decrypterType, (method) => { });
}
public static EmbeddedResource findEmbeddedResource(ModuleDefinition module, TypeDefinition decrypterType, ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
return findEmbeddedResource(module, decrypterType, (method) => {
simpleDeobfuscator.deobfuscate(method);
simpleDeobfuscator.decryptStrings(method, deob);
});
}
public static EmbeddedResource findEmbeddedResource(ModuleDefinition module, TypeDefinition decrypterType, Action<MethodDefinition> fixMethod) {
foreach (var method in decrypterType.Methods) {
if (!DotNetUtils.isMethod(method, "System.String", "()"))
continue;
if (!method.IsStatic)
continue;
fixMethod(method);
foreach (var s in DotNetUtils.getCodeStrings(method)) {
var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
if (resource != null)
return resource;
}
}
return null;
}
public static bool findRegisterMethod(TypeDefinition type, out MethodDefinition regMethod, out MethodDefinition handler) {
foreach (var method in type.Methods) {
if (!method.IsStatic || method.Body == null)
continue;
if (method.Body.ExceptionHandlers.Count != 1)
continue;
foreach (var instr in method.Body.Instructions) {
if (instr.OpCode.Code != Code.Ldftn)
continue;
var handlerRef = instr.Operand as MethodReference;
if (handlerRef == null)
continue;
if (!DotNetUtils.isMethod(handlerRef, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)"))
continue;
if (!MemberReferenceHelper.compareTypes(type, handlerRef.DeclaringType))
continue;
handler = DotNetUtils.getMethod(type, handlerRef);
if (handler == null)
continue;
if (handler.Body == null || handler.Body.ExceptionHandlers.Count != 1)
continue;
regMethod = method;
return true;
}
}
regMethod = null;
handler = null;
return false;
}
}
}

19
de4dot.code/deobfuscators/Babel_NET/ConstantsDecrypter.cs
View File

@ -141,7 +141,7 @@ namespace de4dot.code.deobfuscators.Babel_NET {
if (decrypterType == null)
return;
encryptedResource = findEncryptedResource(simpleDeobfuscator, deob);
encryptedResource = BabelUtils.findEmbeddedResource(module, decrypterType, simpleDeobfuscator, deob);
if (encryptedResource == null) {
Log.w("Could not find encrypted constants resource");
return;
@ -172,23 +172,6 @@ namespace de4dot.code.deobfuscators.Babel_NET {
decryptedDoubles[count] = reader.ReadDouble();
}
EmbeddedResource findEncryptedResource(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
foreach (var method in decrypterType.Methods) {
if (!DotNetUtils.isMethod(method, "System.String", "()"))
continue;
if (!method.IsStatic)
continue;
simpleDeobfuscator.deobfuscate(method);
simpleDeobfuscator.decryptStrings(method, deob);
foreach (var s in DotNetUtils.getCodeStrings(method)) {
var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
if (resource != null)
return resource;
}
}
return null;
}
public int decryptInt32(int index) {
return decryptedInts[index];
}

19
de4dot.code/deobfuscators/Babel_NET/MethodsDecrypter.cs
View File

@ -94,7 +94,7 @@ namespace de4dot.code.deobfuscators.Babel_NET {
if (methodsDecrypter == null)
return;
encryptedResource = findEncryptedResource(simpleDeobfuscator, deob);
encryptedResource = BabelUtils.findEmbeddedResource(module, methodsDecrypter, simpleDeobfuscator, deob);
if (encryptedResource == null) {
Log.w("Could not find encrypted methods resource");
return;
@ -114,23 +114,6 @@ namespace de4dot.code.deobfuscators.Babel_NET {
imageReaders[name] = imageReader;
}
EmbeddedResource findEncryptedResource(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
foreach (var method in methodsDecrypter.Methods) {
if (!DotNetUtils.isMethod(method, "System.String", "()"))
continue;
if (!method.IsStatic)
continue;
simpleDeobfuscator.deobfuscate(method);
simpleDeobfuscator.decryptStrings(method, deob);
foreach (var s in DotNetUtils.getCodeStrings(method)) {
var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
if (resource != null)
return resource;
}
}
return null;
}
class EncryptInfo {
public string encryptedMethodName;
public string feature;

51
de4dot.code/deobfuscators/Babel_NET/ResourceResolver.cs
View File

@ -19,7 +19,6 @@
using System.IO;
using Mono.Cecil;
using Mono.Cecil.Cil;
using de4dot.blocks;
namespace de4dot.code.deobfuscators.Babel_NET {
@ -59,10 +58,10 @@ namespace de4dot.code.deobfuscators.Babel_NET {
continue;
MethodDefinition regMethod, handler;
if (!findRegisterMethod(type, out regMethod, out handler))
if (!BabelUtils.findRegisterMethod(type, out regMethod, out handler))
continue;
var resource = findEmbeddedResource(type);
var resource = BabelUtils.findEmbeddedResource(module, type);
if (resource == null)
continue;
@ -73,52 +72,6 @@ namespace de4dot.code.deobfuscators.Babel_NET {
}
}
bool findRegisterMethod(TypeDefinition type, out MethodDefinition regMethod, out MethodDefinition handler) {
foreach (var method in type.Methods) {
if (!method.IsStatic || method.Body == null)
continue;
if (method.Body.ExceptionHandlers.Count != 1)
continue;
foreach (var instr in method.Body.Instructions) {
if (instr.OpCode.Code != Code.Ldftn)
continue;
var handlerRef = instr.Operand as MethodReference;
if (handlerRef == null)
continue;
if (!DotNetUtils.isMethod(handlerRef, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)"))
continue;
if (!MemberReferenceHelper.compareTypes(type, handlerRef.DeclaringType))
continue;
handler = DotNetUtils.getMethod(type, handlerRef);
if (handler == null)
continue;
if (handler.Body == null || handler.Body.ExceptionHandlers.Count != 1)
continue;
regMethod = method;
return true;
}
}
regMethod = null;
handler = null;
return false;
}
EmbeddedResource findEmbeddedResource(TypeDefinition type) {
foreach (var method in type.Methods) {
if (!DotNetUtils.isMethod(method, "System.String", "()"))
continue;
foreach (var s in DotNetUtils.getCodeStrings(method)) {
var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
if (resource != null)
return resource;
}
}
return null;
}
public EmbeddedResource mergeResources() {
if (encryptedResource == null)
return null;

13
de4dot.code/deobfuscators/Babel_NET/StringDecrypter.cs
View File

@ -213,7 +213,7 @@ namespace de4dot.code.deobfuscators.Babel_NET {
return;
if (decrypterInfo.NeedsResource) {
encryptedResource = findResource();
encryptedResource = BabelUtils.findEmbeddedResource(module, decrypterType);
if (encryptedResource == null)
return;
}
@ -221,17 +221,6 @@ namespace de4dot.code.deobfuscators.Babel_NET {
decrypterInfo.initialize(module, encryptedResource);
}
EmbeddedResource findResource() {
foreach (var method in decrypterType.Methods) {
foreach (var s in DotNetUtils.getCodeStrings(method)) {
var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
if (resource != null)
return resource;
}
}
return null;
}
public string decrypt(object[] args) {
return decrypterInfo.decrypt(args);
}