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124 lines
4.8 KiB
124 lines
4.8 KiB
<div align="center">
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<div>
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<img src="https://githacks.org/uploads/-/system/project/avatar/374/icon-5.png"/>
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</div>
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<p>Download: git clone --recursive https://githacks.org/vmp2/vmprofiler.git</p>
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</div>
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### VMProfiler - Library To Profile VMProtect 2 Virtual Machines
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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.
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# [Doxygen Documentation](https://docs.back.engineering/vmprofiler/index.html)
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### Credit & Contributors
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* [VTIL](https://github.com/vtil-project/VTIL-Core) - Virtual-machine Translation Intermediate Language
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* [Zydis](https://github.com/zyantific/zydis) - Fast and lightweight x86/x86-64 disassembler library
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* [irql0](https://github.com/irql0) - helped with the first version of vm handler pattern matching
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### Basic Usage - Creating a vm::ctx_t Object
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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:
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* all vm handlers for a given vm entry
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* the linear virtual address of the module base in memory
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* the image base address
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* the image size in virtual memory
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* which way VIP advances (exec_type)
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* vm entry relative virtual address
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* vm entry deobfuscated and flattened
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* calc jmp deobfuscated and flattened
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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.
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```cpp
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const auto module_base = reinterpret_cast< std::uintptr_t >(
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LoadLibraryExA( parser.get< std::string >( "bin" ).c_str(),
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NULL, DONT_RESOLVE_DLL_REFERENCES ) );
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const auto vm_entry_rva = std::strtoull( parser.get< std::string >( "vmentry" ).c_str(), nullptr, 16 );
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const auto image_base = umtils->image_base( parser.get< std::string >( "bin" ).c_str() );
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const auto image_size = NT_HEADER( module_base )->OptionalHeader.SizeOfImage;
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vm::ctx_t vmctx( module_base, image_base, image_size, vm_entry_rva );
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if ( !vmctx.init() )
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{
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std::printf( "[!] failed to init vm::ctx_t... make sure all cli arguments are correct!\n" );
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return -1;
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}
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```
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### Using vm::ctx_t Object
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Once you have instantiated `vm::ctx_t` and called `vm::ctx_t::init` with success, you now can directly access the data members of `vm::ctx_t`. Most importantly, `vm::ctx_t::calc_jmp`, `vm::ctx_t::vm_entry`, and `vm::ctx_t::vm_handlers`. An example usage of this data could be dumping the native x86_64 instructions which make up `vm::ctx_t::vm_entry`. Example c++ code for this is displayed below.
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```cpp
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std::puts( "======================== [vm entry] ========================\n" );
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vm::util::print( vmctx.vm_entry );
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```
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***Output***
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```
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======================== [vm entry] ========================
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> 0x00007FF7911A822C push 0xFFFFFFFF890001FA
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> 0x00007FF7911A7FC9 push 0x45D3BF1F
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> 0x00007FF7911A48E4 push r13
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> 0x00007FF7911A4690 push rsi
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> 0x00007FF7911A4E53 push r14
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> 0x00007FF7911A74FB push rcx
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> 0x00007FF7911A607C push rsp
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> 0x00007FF7911A4926 pushfq
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> 0x00007FF7911A4DC2 push rbp
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> 0x00007FF7911A5C8C push r12
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> 0x00007FF7911A52AC push r10
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> 0x00007FF7911A51A5 push r9
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> 0x00007FF7911A5189 push rdx
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> 0x00007FF7911A7D5F push r8
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> 0x00007FF7911A4505 push rdi
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> 0x00007FF7911A4745 push r11
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> 0x00007FF7911A478B push rax
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> 0x00007FF7911A7A53 push rbx
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> 0x00007FF7911A500D push r15
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> 0x00007FF7911A6030 push [0x00007FF7911A7912]
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> 0x00007FF7911A593A mov rax, 0x7FF6511A0000
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> 0x00007FF7911A5955 mov r13, rax
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> 0x00007FF7911A595F test dl, al
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> 0x00007FF7911A5965 push rax
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> 0x00007FF7911A5969 btr si, bx
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> 0x00007FF7911A596F mov esi, [rsp+0xA0]
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> 0x00007FF7911A5979 not esi
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> 0x00007FF7911A5985 neg esi
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> 0x00007FF7911A598D ror esi, 0x1A
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> 0x00007FF7911A599E mov rbp, rsp
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> 0x00007FF7911A59A8 sub rsp, 0x140
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> 0x00007FF7911A59B5 and rsp, 0xFFFFFFFFFFFFFFF0
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> 0x00007FF7911A59BE inc ax
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> 0x00007FF7911A59C1 mov rdi, rsp
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> 0x00007FF7911A59C7 bsr r12, rax
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> 0x00007FF7911A59CB lea r12, [0x00007FF7911A6473]
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> 0x00007FF7911A59DF mov rax, 0x100000000
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> 0x00007FF7911A59EC add rsi, rax
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> 0x00007FF7911A59F3 mov rbx, rsi
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> 0x00007FF7911A59FA add rsi, [rbp]
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> 0x00007FF7911A5A03 rcr dl, cl
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> 0x00007FF7911A5A05 mov al, [rsi]
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> 0x00007FF7911A5A0A xor al, bl
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> 0x00007FF7911A5A11 neg al
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> 0x00007FF7911A5A19 rol al, 0x05
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> 0x00007FF7911A5A26 inc al
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> 0x00007FF7911A5A2F xor bl, al
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> 0x00007FF7911A5A34 movzx rax, al
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> 0x00007FF7911A5A41 mov rdx, [r12+rax*8]
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> 0x00007FF7911A5A49 xor rdx, 0x7F3D2149
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> 0x00007FF7911A5507 inc rsi
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> 0x00007FF7911A7951 add rdx, r13
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> 0x00007FF7911A7954 jmp rdx
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```
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### License & Copyright
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Copyright (c) 2021 _xeroxz, Independent Researcher @back.engineering
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Licensed under the MIT License |