Bojan,

have you asked Google first?

From my understanding you will need to modify an existing application to execute your 'hidden' code, therefore I'd be surprised if there are any tools that can automate the process (at least I haven't come across anything).

yes dean,I am looking for a good binder!!I was using upx for some time but it was not that good!So can you please tell me is there any good binder available?but at the same time I want to know that what actually a binder does?Is binder will help me to change the look of my programme??

Reading back to the original post, he wanted to hide it within a picture or video.  That changes the deal a little bit.  It is easier to hide an executable within another executable than it is to hide an executable in a picture or video.  The idea is that the .exe is already making system calls and such that you can abuse, while a video or picture is generally read from and interpreted by some other application.  There are ways to include nasty code into a video or picture so that the application reading the file gets "hacked", but this isn't the same as having a hidden program kick off in the background.  There are some ways to do this, but they are not as clean or consistent as you'd probably like.

dean,
    Agree with your post, I just noticed that he seemed to be stressing the "image,video" issue.  As you mentioned, it can be straightforward to hide a file in an image, but getting to execute and run when viewed isn't trivial. 

I think the purpose of his question was to find a way to hid a program so that it was not directly observable to the user.  To do that the program would have to be hidden in the data and file structure of the trojaned data (or an alternate date stream), and the resources necessary to run the program would have to be shared in such a way that they are not directly attributable to the hidden executable.  (or hidden with a rootkit?) 

Well there's your problem... it looks like your blinker fluid is low and you need to rotate your muffler bearings.  If you have a VAX system sitting around you could put together a banyan bomb and push it through the intergoogletubes to your target.

Hey bojan,

You've been given a few things to go on, and if it ends up being that difficult to compromise the target, maybe we can deduce that the security is good. Now we can move on to other machines in the network that you have permission to test. You know the theme of this site, so I'm assuming this is either a client for which you have permission to do this or it's your own lab.

Either way, I think this thread has run its course.

Don