How to write and execute PURE machine code manually without containers like EXE or ELF?

Question

I just need a hello world demo to see how machine code actually works.

Though windows\' EXE and linux\' ELF is near machine code,bu

Answer 1

On Windows--at least 32bit Windows--you can execute RAW INSTRUCTIONS using a .com file.

For instance, if you take this string and save it in notepad with a .com extension:

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

It will print a string and set off your antivirus software.