A trick to hide your secret files in JPG files

Jul

stored in: Tips and Tricks, Tutorials and Guides

I found this when surfing on some hacking sites. But the step was a little complicated, so I’ll simplify it for you. Come on, we often have some secret files that must not revealed to anyone else. We will make a RAR (type of archive similar to that famous ZIP) files that look and act as image file (JPG in this case). No, we won’t talk about steganography or encryption or something. All we need is an access to command prompt and you should get a RAR file concealed in JPG file.

Okay, let’s go straight to the first step.

Prepare your image file with jpg extention and have your files packed in a rar files.
I’ll assume you have “image.jpg” and “secret.rar” in same folder named “c:\strife”
Open up your command prompt. If you wonder how to open it just click Start > Run, type “cmd” and press enter
Change to the folder where the files placed. Type “cd c:\strife” and press enter
Now, it’s the crucial step. Type “copy /b image.jpg + secret.rar result.jpg”
You will get the file result.jpg in the same folder. Remember not to miss the “/b” because without it you won’t get it right.
Finish!

Do you recognize that the result image has bigger filesize than the original image? Yes, you have embedded the rar archive to that image. Open it with your image viewer and you get the image exactly same as before, other than the size is a lot bigger.

But, how to open the secret hidden files? It’s a little tricky. Right-click your “result image” and select “open with…” then try to use WinRAR to open that file. Hey, I don’t need to explain you how. Right?

Now, you can mail or transfer the file more securely with the files hidden in rar files camouflaged in image files. Don’t forget to tell the recipient how to open it. Yeah, you can give password to the rar to make it more secure.

Regards,
Strife Leonhart

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12 Responses to “A trick to hide your secret files in JPG files”

XSc12pDZhe (Who am I?) Says:
July 26th, 2008 at 7:38 am

It shuldn be a secret if it has been published,,..hohoho
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Sandy-kun (Who am I?) Says:
July 27th, 2008 at 4:13 am
Huehee..Nice trick… But can i add more than one files rar behind??

and,what is the mean of /b that should be entered??
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Strife Leonhart (Who am I?) Says:
July 27th, 2008 at 10:50 am
@XSc12pDZhe
(damn.. your nick’s hard to write)
It’s ‘Secret File’, not ‘Secret Trick’

@Sandy-kun
i dunno waddya mean…
/b stands for “Binary”
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Steax (Who am I?) Says:
July 28th, 2008 at 3:00 am
Yes, you can have multiple RAR files. \b ensures the copying takes place as a binary operation and not ASCII (because that would screw the encoding, as JPEGs are hex-encoded). The technique basically just appends the RAR content to the end of the image file, which would not be read since it would lie after the EOI (end of image) 0xFFD9 marker of the image.

Be weary that some image editors might complain that the file is corrupted/damaged or that it might be virus-contaminated. (Yeah, because you could put an executable script there and have the “image” called by another, harmless-looking, script.)
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Sandykun (Who am I?) Says:
July 30th, 2008 at 3:48 am
@ Steax

Thanx for the info…^^

Hehe.. So , we can also adding a virus script ,huh?? Sounds interesting!!
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Xaliber von Reginhild (Who am I?) Says:
August 1st, 2008 at 4:12 pm
Couldn’t we just rename the .RAR extension to another? For example, renaming file.rar into file.gif or file.txt.

And open it with the same way we do it above (or rename it again). I’ve tried it once, and it seems there was no problem with this way. :P
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strife leonhart (Who am I?) Reply:
August 2nd, 2008 at 8:45 am
yes it can, but you can’t properly open .rar files with image viewer.. it should say an error… and someone might think it as corrupt file and delete it

in .txt files case, you can tell the filetype by opening a .rar files with notepad… sure, just check it out…
if you conceal it in a text… the secret will get revealed soon after they recognize the filetype
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scriptzhe (Who am I?) Says:
August 4th, 2008 at 7:39 am
just call me scriptzhe.,.,.,huehue
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command filesize Says:
August 6th, 2008 at 8:13 am
[...] [...]
AlexM (Who am I?) Says:
August 12th, 2008 at 7:48 pm
I found your site on technorati and read a few of your other posts. Keep up the good work. I just added your RSS feed to my Google News Reader. Looking forward to reading more from you down the road!
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Alex (Who am I?) Says:
August 14th, 2008 at 12:50 pm
Your blog is interesting!

Keep up the good work!
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??????? (Who am I?) Says:
August 24th, 2008 at 11:14 pm
4cThank’s.3z I compleatly agree with last post. zpg
??????? ?????? 0a
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