ELF inject code https://www.matteomalvica.com/blog/2019/05/18/injecting-shellcode-into-x64-elf-binaries/
https://groups.google.com/forum/#!topic/shlug/LfscvsguT64
ELF shell anti-debug https://bbs.pediy.com/thread-225798.htm
obfuscator https://bbs.pediy.com/thread-257224.htm