This is one of the big reasons Rust is so exciting. ABI compatibility with C and no real runtime (no GC etc.).

Though Kapersky would have been better off even using C++/CLI and "It Just Works" to hook into code written in, say, C#. The IJW stuff is cute, as it seamlessly brings the CLR in-process and lets you transition from native to managed without noticing. (And MSVC's C++->CLI targeting is good enough to compile MS Office except producing MSIL instead of native code, fwiw.)