Add code to restore ldtoken instructions
This commit is contained in:
parent
4d5c625c78
commit
c354ded987
|
@ -75,6 +75,7 @@
|
|||
<Compile Include="deobfuscators\dotNET_Reactor\Deobfuscator.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\EncryptedResource.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\LocalTypes.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\MetadataTokenObfuscator.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\MethodsDecrypter.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\StringDecrypter.cs" />
|
||||
<Compile Include="deobfuscators\Eazfuscator\Deobfuscator.cs" />
|
||||
|
|
|
@ -81,6 +81,7 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
|
|||
StringDecrypter stringDecrypter;
|
||||
BooleanDecrypter booleanDecrypter;
|
||||
BoolValueInliner boolValueInliner;
|
||||
MetadataTokenObfuscator metadataTokenObfuscator;
|
||||
|
||||
bool canRemoveDecrypterType = true;
|
||||
bool startedDeobfuscating = false;
|
||||
|
@ -313,6 +314,8 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
|
|||
}
|
||||
DeobfuscatedFile.stringDecryptersAdded();
|
||||
|
||||
metadataTokenObfuscator = new MetadataTokenObfuscator(module);
|
||||
|
||||
if (Operations.DecryptStrings != OpDecryptString.None)
|
||||
addResourceToBeRemoved(stringDecrypter.StringsResource, "Encrypted strings");
|
||||
if (options.DecryptMethods) {
|
||||
|
@ -341,6 +344,7 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
|
|||
}
|
||||
|
||||
public override void deobfuscateMethodEnd(Blocks blocks) {
|
||||
metadataTokenObfuscator.deobfuscate(blocks);
|
||||
base.deobfuscateMethodEnd(blocks);
|
||||
}
|
||||
|
||||
|
@ -348,8 +352,10 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
|
|||
removeInlinedMethods();
|
||||
if (options.RestoreTypes)
|
||||
new TypesRestorer(module).deobfuscate();
|
||||
if (canRemoveDecrypterType && methodsDecrypter.MethodsDecrypterMethod != null)
|
||||
if (canRemoveDecrypterType && methodsDecrypter.MethodsDecrypterMethod != null) {
|
||||
addTypeToBeRemoved(methodsDecrypter.MethodsDecrypterMethod.DeclaringType, "Decrypter type");
|
||||
addTypeToBeRemoved(metadataTokenObfuscator.Type, "Metadata token obfuscator");
|
||||
}
|
||||
base.deobfuscateEnd();
|
||||
}
|
||||
|
||||
|
|
|
@ -0,0 +1,99 @@
|
|||
/*
|
||||
Copyright (C) 2011 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.deobfuscators.dotNET_Reactor {
|
||||
// Find the class that returns a RuntimeTypeHandle/RuntimeFieldHandle. The value passed to
|
||||
// its methods is the original metadata token, which will be different when we save the file.
|
||||
class MetadataTokenObfuscator {
|
||||
ModuleDefinition module;
|
||||
TypeDefinition type;
|
||||
MethodDefinition typeMethod;
|
||||
MethodDefinition fieldMethod;
|
||||
|
||||
public TypeDefinition Type {
|
||||
get { return type; }
|
||||
}
|
||||
|
||||
public MetadataTokenObfuscator(ModuleDefinition module) {
|
||||
this.module = module;
|
||||
find();
|
||||
}
|
||||
|
||||
void find() {
|
||||
foreach (var type in module.Types) {
|
||||
var fields = type.Fields;
|
||||
if (fields.Count != 1)
|
||||
continue;
|
||||
if (fields[0].FieldType.FullName != "System.ModuleHandle")
|
||||
continue;
|
||||
if (type.HasProperties || type.HasEvents)
|
||||
continue;
|
||||
|
||||
MethodDefinition fieldMethod = null, typeMethod = null;
|
||||
foreach (var method in type.Methods) {
|
||||
if (DotNetUtils.isMethod(method, "System.RuntimeTypeHandle", "(System.Int32)"))
|
||||
typeMethod = method;
|
||||
else if (DotNetUtils.isMethod(method, "System.RuntimeFieldHandle", "(System.Int32)"))
|
||||
fieldMethod = method;
|
||||
}
|
||||
|
||||
if (typeMethod == null || fieldMethod == null)
|
||||
continue;
|
||||
|
||||
this.type = type;
|
||||
this.typeMethod = typeMethod;
|
||||
this.fieldMethod = fieldMethod;
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
public void deobfuscate(Blocks blocks) {
|
||||
if (type == null)
|
||||
return;
|
||||
|
||||
foreach (var block in blocks.MethodBlocks.getAllBlocks()) {
|
||||
var instrs = block.Instructions;
|
||||
for (int i = 0; i < instrs.Count - 1; i++) {
|
||||
var instr = instrs[i];
|
||||
if (instr.OpCode.Code != Code.Ldc_I4)
|
||||
continue;
|
||||
var call = instrs[i + 1];
|
||||
if (call.OpCode.Code != Code.Call)
|
||||
continue;
|
||||
var method = call.Operand as MethodReference;
|
||||
if (!MemberReferenceHelper.compareTypes(type, method.DeclaringType))
|
||||
continue;
|
||||
var methodDef = DotNetUtils.getMethod(module, method);
|
||||
if (methodDef == null)
|
||||
continue;
|
||||
if (methodDef != typeMethod && methodDef != fieldMethod)
|
||||
continue;
|
||||
|
||||
int token = (int)instrs[i].Operand;
|
||||
instrs[i] = new Instr(Instruction.Create(OpCodes.Nop));
|
||||
instrs[i + 1] = new Instr(new Instruction(OpCodes.Ldtoken, module.LookupToken(token) as MemberReference));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue
Block a user