Can you see the code?

Question

Programming

Good afternoon! I'm not strong in programming, but I'm interested in the following questions:
1. Is it possible to see and get acquainted with the program code?
2. What programs are there for analyzing program code?
3. What are the ways to hide this code so that no one will ever see it?
4. How can the code of a virus program be analyzed?

Answer 1

1) Yes, if it is open source, well, or disassemble
2) These are called debuggers (windbg, x64dbg, softice) and disassemblers (ida, radare probably still exist, I'm not special in this topic)
3) A lot of techniques, but "no one ever achieves did not see it" is impossible, only if this program is stored on your disks and does not get on the Internet. Otherwise, knowledgeable people, armed with the tools from paragraph 2, will be able to see the code of your program.
4) Just like a regular program, armed with the tools from paragraph 2 and knowledge about the OS device, processor, C language (optional) and assembler (required). Although a virus program can be written in a scripting language in general, which is in mach. the code does not compile (well, directly), then you can just sit down and read the code of the malicious program exactly in the form in which it is written.