I am trying to make a loder for vmprotect application, but as you know the sections are crypted first and then they get decrypt on runtime. So is there any loader generator which can help me in the case so that it should patch the bytes when the code get decrypt. dup is not having that option. it is simple but i am searching for something good.

well, you can do it yourself in following easy way:
repeat - ReadProcessMemory(some-dword) - until some-dword decrypted