2011-11-06 19:19:26 +08:00
|
|
|
|
/*
|
2012-01-10 06:02:47 +08:00
|
|
|
|
Copyright (C) 2011-2012 de4dot@gmail.com
|
2011-11-06 19:19:26 +08:00
|
|
|
|
|
|
|
|
|
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;
|
2012-04-22 22:18:41 +08:00
|
|
|
|
using System.IO;
|
2011-11-06 19:19:26 +08:00
|
|
|
|
using Mono.Cecil;
|
2012-04-22 20:16:33 +08:00
|
|
|
|
using de4dot.blocks;
|
2012-04-22 22:18:41 +08:00
|
|
|
|
using de4dot.PE;
|
2011-11-06 19:19:26 +08:00
|
|
|
|
|
2011-12-09 16:02:06 +08:00
|
|
|
|
namespace de4dot.code.deobfuscators.CliSecure {
|
2011-11-06 19:19:26 +08:00
|
|
|
|
class CliSecureRtType {
|
|
|
|
|
ModuleDefinition module;
|
|
|
|
|
TypeDefinition cliSecureRtType;
|
|
|
|
|
MethodDefinition postInitializeMethod;
|
|
|
|
|
MethodDefinition initializeMethod;
|
|
|
|
|
MethodDefinition stringDecrypterMethod;
|
|
|
|
|
MethodDefinition loadMethod;
|
2012-04-22 22:18:41 +08:00
|
|
|
|
bool foundSig;
|
2011-11-06 19:19:26 +08:00
|
|
|
|
|
|
|
|
|
public bool Detected {
|
2012-04-22 22:18:41 +08:00
|
|
|
|
get { return foundSig || cliSecureRtType != null; }
|
2011-11-06 19:19:26 +08:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public TypeDefinition Type {
|
|
|
|
|
get { return cliSecureRtType; }
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public MethodDefinition StringDecrypterMethod {
|
|
|
|
|
get { return stringDecrypterMethod; }
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public MethodDefinition PostInitializeMethod {
|
|
|
|
|
get { return postInitializeMethod; }
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public MethodDefinition InitializeMethod {
|
|
|
|
|
get { return initializeMethod; }
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public MethodDefinition LoadMethod {
|
|
|
|
|
get { return loadMethod; }
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public CliSecureRtType(ModuleDefinition module) {
|
|
|
|
|
this.module = module;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public CliSecureRtType(ModuleDefinition module, CliSecureRtType oldOne) {
|
|
|
|
|
this.module = module;
|
|
|
|
|
cliSecureRtType = lookup(oldOne.cliSecureRtType, "Could not find CliSecureRt type");
|
|
|
|
|
postInitializeMethod = lookup(oldOne.postInitializeMethod, "Could not find postInitializeMethod method");
|
|
|
|
|
initializeMethod = lookup(oldOne.initializeMethod, "Could not find initializeMethod method");
|
|
|
|
|
stringDecrypterMethod = lookup(oldOne.stringDecrypterMethod, "Could not find stringDecrypterMethod method");
|
|
|
|
|
loadMethod = lookup(oldOne.loadMethod, "Could not find loadMethod method");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
T lookup<T>(T def, string errorMessage) where T : MemberReference {
|
|
|
|
|
return DeobUtils.lookup(module, def, errorMessage);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public void find() {
|
|
|
|
|
if (cliSecureRtType != null)
|
|
|
|
|
return;
|
2012-04-22 20:16:33 +08:00
|
|
|
|
if (find2())
|
|
|
|
|
return;
|
2012-04-22 22:18:41 +08:00
|
|
|
|
if (findOld())
|
|
|
|
|
return;
|
|
|
|
|
findNativeCode();
|
2012-04-22 20:16:33 +08:00
|
|
|
|
}
|
2011-11-06 19:19:26 +08:00
|
|
|
|
|
2012-04-22 20:16:33 +08:00
|
|
|
|
bool find2() {
|
2011-11-06 19:19:26 +08:00
|
|
|
|
foreach (var type in module.Types) {
|
|
|
|
|
if (type.Namespace != "")
|
|
|
|
|
continue;
|
|
|
|
|
var typeName = type.FullName;
|
|
|
|
|
|
|
|
|
|
MethodDefinition cs = null;
|
|
|
|
|
MethodDefinition initialize = null;
|
|
|
|
|
MethodDefinition postInitialize = null;
|
|
|
|
|
MethodDefinition load = null;
|
|
|
|
|
|
|
|
|
|
int methods = 0;
|
|
|
|
|
foreach (var method in type.Methods) {
|
|
|
|
|
if (method.FullName == "System.String " + typeName + "::cs(System.String)") {
|
|
|
|
|
cs = method;
|
|
|
|
|
methods++;
|
|
|
|
|
}
|
|
|
|
|
else if (method.FullName == "System.Void " + typeName + "::Initialize()") {
|
|
|
|
|
initialize = method;
|
|
|
|
|
methods++;
|
|
|
|
|
}
|
|
|
|
|
else if (method.FullName == "System.Void " + typeName + "::PostInitialize()") {
|
|
|
|
|
postInitialize = method;
|
|
|
|
|
methods++;
|
|
|
|
|
}
|
|
|
|
|
else if (method.FullName == "System.IntPtr " + typeName + "::Load()") {
|
|
|
|
|
load = method;
|
|
|
|
|
methods++;
|
|
|
|
|
}
|
|
|
|
|
}
|
2011-12-21 13:40:10 +08:00
|
|
|
|
if (methods == 0 || (methods == 1 && initialize != null))
|
2011-11-06 19:19:26 +08:00
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
stringDecrypterMethod = cs;
|
|
|
|
|
initializeMethod = initialize;
|
|
|
|
|
postInitializeMethod = postInitialize;
|
|
|
|
|
loadMethod = load;
|
|
|
|
|
cliSecureRtType = type;
|
2012-04-22 20:16:33 +08:00
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool findOld() {
|
|
|
|
|
var methodToCheck = DotNetUtils.getModuleTypeCctor(module);
|
|
|
|
|
if (methodToCheck == null)
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
foreach (var calledMethod in DotNetUtils.getCalledMethods(module, methodToCheck)) {
|
|
|
|
|
var type = calledMethod.DeclaringType;
|
|
|
|
|
if (!hasPinvokeMethod(type, "_Initialize"))
|
|
|
|
|
continue;
|
|
|
|
|
if (!hasPinvokeMethod(type, "_Initialize64"))
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
initializeMethod = calledMethod;
|
|
|
|
|
cliSecureRtType = type;
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
2012-04-22 22:18:41 +08:00
|
|
|
|
bool findNativeCode() {
|
|
|
|
|
if ((module.Attributes & ModuleAttributes.ILOnly) != 0)
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
var peImage = new PeImage(new FileStream(module.FullyQualifiedName, FileMode.Open, FileAccess.Read, FileShare.Read));
|
|
|
|
|
foundSig = MethodsDecrypter.detect(peImage);
|
|
|
|
|
return foundSig;
|
|
|
|
|
}
|
|
|
|
|
|
2012-04-22 20:16:33 +08:00
|
|
|
|
static bool hasPinvokeMethod(TypeDefinition type, string methodName) {
|
|
|
|
|
foreach (var method in type.Methods) {
|
|
|
|
|
if (method.PInvokeInfo == null)
|
|
|
|
|
continue;
|
|
|
|
|
if (method.PInvokeInfo.EntryPoint == methodName)
|
|
|
|
|
return true;
|
2011-11-06 19:19:26 +08:00
|
|
|
|
}
|
2012-04-22 20:16:33 +08:00
|
|
|
|
return false;
|
2011-11-06 19:19:26 +08:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|