Virus programming (not so basic) #2

Infecting an .EXE is not much more difficult than infecting a
.COM. To do so, you must learn about a structure known as the EXE
header. Once you've picked this up, it's not so difficult and it
offers many more options than just a simple jump at the beginning
of the code.

Let's begin:

% The Header structure %
The information on EXE header structure is available from any
good DOS book, and even from some other H/P/V mags. Anyhow, I'll
include that information here for those who don't have those
sources to understand what I'm talking about...

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