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What is ADVobfuscator?

ADVobfuscator demonstates how to use C++11/14 language to generate, at compile time, obfuscated code without using any external tool and without modifying the compiler. The technics presented rely only on C++11/14, as standardized by ISO. It shows also how to introduce some form of randomness to generate polymorphic code and it gives some concrete examples like the encryption of strings literals and the obfuscation of calls using finite state machines.

ADVobfuscator is delivered as a set of source file (source code library). You have to include them into your project and call the appropriate functions or macro. This is not a magic black box or some kind of code pre-processor or post-processor. It has to be integrated manually into your source code.

If you are looking for a more transparent obfuscator, look at Obfuscator-LLVM or strong.codes (commercial version of Obfuscator-LLVM). Note: I have no affiliation with Obfuscator-LLVM and strong.codes. I just know some of those swiss folks.

News

August 2017

  • Enhance the compatibility with compiler's optimizer (such as GCC with O3). Previously, the code was sometimes overoptimized by the compiler and as a consequence, non-obfuscated strings remains in the binary code. This was more or less due to a bug in ADVobfuscator (I was not using volatile).
  • Fix a stupid mistake in algorithm #2 (shift). Sometimes, the encryption key is 0.
  • Clearly seperate the library code (under Lib) from the examples (under Examples and DocCode).
  • Check the compatibility with C++14. In the future, I will probably drop the support of C++11 and keep only C++14 and C++17 compatibility.

August 2016

Several enhancement (suppress warnings, fix some errors, enhance portability). In more details:

  • Increase the warning level for Visual Studio and GCC
  • Remove several (all) compilation warnings
  • Replace int by size_t when it is appropriate (sizeof, position)
  • Remove unused parameters
  • Keys are now of type char (were of type int, it was wrong)
  • Replace the non-portable ##__VA_ARGS__ by the portable __VA_ARGS__. As a consequence, new macros (ending with 0) are defined when there are no parameters
  • Remove some (stupid) syntax errors (; at the end of some functions). C/C++ is odd: you have to put a ; when you define a struct, but none when you define a function
  • A integral type is computed at compile time to store pointers to functions

August 2015

ADVobfuscator code has been updated for Visual Studio 2015. ADVobfuscator is now compatible with the RTM release of Visual Studio 2015 (previous versions or CTP releases are not). The whitepaper is not yet updated. The code has also been modified in order to avoid problems with O3 optimization and GCC. GCC with O3 defeats obfuscation (because it optimizes too much) and sometimes generates wrong code (not clear yet if it is a bug in GCC or in ADVobfuscator).

How to use it?

First you have to follow the requirements below. Then, you just have to include ADVobfuscator header files and use macros such as OBFUSCATED to protect your strings or function calls.

Look at the examples in the Examples folder.

Prerequisites

  • A C++11 or C++14 compatible compiler (i.e. a compiler that is not too old)
  • Obfuscated strings: no other prerequisite
  • Obfuscated calls and predicates: You have to install the Boost library. See below

Boost Library

You have to install the Boost library in order to use some features of ADVdetector (it is used by FSM). To install Boost:

  • Debian / Ubuntu: sudo apt-get install libboost-all-dev
  • Mac OS X: brew install boost
  • Windows: Download Boost and install it. Then you have to change the Visual Studio project to point to Boost

Examples

Linux

cd Examples
make

Each example is in its subdirectory.

macOS

Open ADVobfuscator.xcworkspace and build each example.

Windows

Open ADVobfuscator.sln. Be sure to change the path to Boost library for each project (Properties | C/C++ | General | Additional Include Directories).

Debug Builds

Debug builds are very special: Compiler do not have (and do not most of the time) respect statement such as inline or constexpr. All optimizations are also, by default, disabled. Compilers are doing this for a good reason: let you debug, single step, etc.

As a consequence, ADVobfuscator is not compatible with Debug builds. It works only for Release builds.

Compatibility

ADVobfuscator has been tested with:

  • Xcode (LLVM) 8.1.0 under Mac OS X 10.12
  • GCC 7.2.0 under Debian 10 (buster - testing)
  • Visual Studio 2017 (15.3.3) under Windows 10
  • Boost 1.65.0

Other compilers are probably compatible if they are C++11/14 compliant.

Future Directions

These are ideas for the next few months:

  • Create version 5 of MetaString: instead of choosing one algorithm, it will combine several. This way, tools such as XOR breakers will not work.
  • Switch to C++14 and C++17. It will simplify some parts of the code and C++ is now well supported by compilers such as GCC and CLANG
  • Try to better support Visual Studio 2015, but only if it does not implies a restructuring of the code
  • Introduce White Box Cryptography (AES in particular). Still in my mind but I am not very active for the moment
  • Is my code compatible with ASLR? In fact, I don't konw and I have to solve this (I need it for another project)
  • Apply the techniques used in MetaString4.h into ObfuscatedCall.h
  • )ntroduce Unit Testing

Files and Folders

Files and Folders Description
README.md This file
Lib ADVobfuscator library
Examples Examples of using ADVobfuscator
Examples/Makefile Make file that build all the examples
Examples/ObfuscatedString Example of using ADVobfuscator to obfuscate strings
Examples/ObfuscatedCalls Example of using ADVobfuscator to obfuscate function calls
Examples/DetectDebugger Example of using ADVobfuscator to obfuscate function calls triggered by a predicate
Docs My talks and white papers
DocCode Code memtionned in the documents

Lib

Files Description
Indexes.h Generate list of indexes at compile time (0, 1, 2, ... N)
MetaFSM.h Template to generate Finite State Machines at compile time
MetaRandom.h Generate a pseudo-random number at compile time
MetaString.h Obfuscated string - version 4 - Random encryption algorithm
ObfuscatedCall.h Obfuscate function call
ObfuscatedCallWithPredicate.h Obfuscate function call, execute a FSM based on a predicate
ADVobfuscator.xcodeproj Project for Apple Xcode
ADVobfuscator.sln Visual Studio 2015 Solution

DocCode

Files Description
MetaFactorial.h Compute factorial at compile time
MetaFibonacci.h Compute fibonacci sequence at compile time
MetaString1.h Obfuscated string - version 1
MetaString2.h Obfuscated string - version 2 - Remove truncation
MetaString3.h Obfuscated string - version 3 - Random key
MetaString4.h Obfuscated string - version 4 - Random encryption algorithm

Examples

Files Description
DetectDebugger.cpp Debugger detection, implemented for Mac OS X and iOS. It is used by ObfuscatedCallWithPredicate (FSM)
DetectDebugger.h Debugger detection, declaration
main.cpp Samples
Makefile Simple makefile for GCC
ADVobfuscator.sln Visual Studio 2017 Solution
ADVobfuscator.xcworkspace Xcode workspace

Copyright and license

Written by Sebastien Andrivet - Copyright © 2010-2017 Sebastien Andrivet.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.