VMProfiler - Library To Profile VMProtect 2 Virtual Machines

vmprofiler is a c++ library which is used to statically analyze VMProtect 2 polymorphic virtual machines. This project is inherited in vmprofiler-qt, vmprofiler-cli, and vmemu. This is the base project for all other VMProtect 2 projects inside of this group on githacks.

Credit & Contributors

• VTIL - Virtual-machine Translation Intermediate Language
• Zydis - Fast and lightweight x86/x86-64 disassembler library
• irql0 - helped with the first version of vm handler pattern matching

Basic Usage - Creating a vm::ctx_t Object

The vm::ctx_t class is a small container-like class which is simply used to contain all information for a given vm entry. This class contains the following useful information:

• all vm handlers for a given vm entry
• the linear virtual address of the module base in memory
• the image base address
• the image size in virtual memory
• which way VIP advances (exec_type)
• vm entry relative virtual address
• vm entry deobfuscated and flattened
• calc jmp deobfuscated and flattened

All of the above information is generated by executing the vm::ctx_t::init member function. Below is a C++ example of how to create a vm::ctx_t object.

const auto module_base = reinterpret_cast< std::uintptr_t >(
    LoadLibraryExA( parser.get< std::string >( "bin" ).c_str(),
        NULL, DONT_RESOLVE_DLL_REFERENCES ) );

const auto vm_entry_rva = std::strtoull( parser.get< std::string >( "vmentry" ).c_str(), nullptr, 16 );
const auto image_base = umtils->image_base( parser.get< std::string >( "bin" ).c_str() );
const auto image_size = NT_HEADER( module_base )->OptionalHeader.SizeOfImage;
vm::ctx_t vmctx( module_base, image_base, image_size, vm_entry_rva );

if ( !vmctx.init() )
{
    std::printf( "[!] failed to init vm::ctx_t... make sure all cli arguments are correct!\n" );
    return -1;
}

Figure 1. Taken from VMProfiler CLI Project