Turn the previous custom dropper into a stealthy version:
Encrypt all strings
Obfuscate all function calls
Change XOR to AES

Real life applications
 Think about how you could hide your encrypted payload behind an image. Hint: file concatenation. Implement a new dropper.
 Build a dropper, which hosts its payload in a separate AES-encrypted file (on disk or on a file share). Hint: use CreateFile() (https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea) and ReadFile() (https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile); example code (https://docs.microsoft.com/en-us/windows/win32/fileio/opening-a-file-for-reading-or-writing).

Good luck!

 - HackingAssets