Dynamic creation of payload executables with metasm

[John Biondolillo <johnb.electric () gmail com>]

I know this is in the works but since I'm impatient I started working on it
my self. I've got a basic payload that just displays a message box with user
supplied data, its portable code so it can be used from Windows 2000 -
Windows 7, but I'm new to assembly so there is no polymorphism meaning if
you create two payloads with the same input they'd be identical I'm guessing
this is were the encoders come in.
I have two questions:

1.  I can't find the asm source for download_exec, since its a simple
payload its the next one I want to do, theres a million examples online but
the one in the framework seems to be very reliable.Can anyone point me in
the right direction to find it.

2. Whats this best way to make each payload unique, adding junk code, random
characters were able in the header, or just try to use one of the encoder
stubs?

Thanks

John

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