Project source code (written in c++) is password protected since it could potentially be used against its purpose (which is to protect intellectual property by obsuscating programs) - for instance to obfuscate malware.

You can use the provided password to unzip the source_code.zip file (if you didn't receive the password, you won't be able to see the source code). You can use the following command:

• 7za x source_code.zip -p

Implementation of the tool named VMObf that performs software obfuscation using virtualization technique.

All the details regarding algorithm, implementation and evaluation can be found in VMObf.pdf.

In short, obfuscation algorithm runs for each function in a program separately, in five main steps:

• Split basic blocks of a given function so that it contains < c (some constant) instructions.
• Divide graph of the function into connected components chosen randomly each time.
• Each connected component becomes a single instruction of the Virtual Machine (VM).
• Each instruction is provided with local variables it needs and returns the modified ones along with the next VM instruction address.
• Since each selected connected component of original graph of the function (VM instruction) may have possibly many entry points and end points, instruction input / output depends on additional argument (passed to this instruction) telling which code it should execute.

In order to run VMObf, the following tools should be installed:

• llvm-11
• clang++-11

• Clone the repository.
• VMObf can be started in two different ways (on Linux):
  • using runVMObf.sh
  • using runVMObf_optimized.sh

Each script expects a single argument: name of a file with .cpp extension. Scripts will automatically build the project.

The first script runs VMObf on an unoptimized code produced by clang. The second one runs VMObf on an optimized code.

Note that, for more complicated programs, obfuscation may take some time (even up to several minutes).