Files disguised as images?

[Slater]

Hmm... I recently saw a .jpg file which said "open with Winrar" and there was a pic of some guy's face next to the text. Sure enough, when I saved the image file and opened it with winrar, I found it to be a valid archive with a short sound byte in it. My guess is that there's a way to do this with winrar... but does anyone know how?

[Mr. Rogers]

i heard something about embedding files in images or something a while ago. some new way to work viruses or something. maybe mith knows more about it.

[Slater]

lol, I just realized how funny the title was... "This isn't a FILE... it's an IMAGE!"

Anyhow, yeah, Mith's smart, probably knoweth

[Mithrandir]

Sorry, man. Unless it's got two extensions, I'm not sure. If you want, forward it to me and I'll try to decompile it and see what it is. I've never run across the ability to add sound to a jpeg, though. I'm pretty sure that's not part of the original rules.

Unless it's like one of these...
http://www.freedownloadscenter.com/Best/rar-sound-files.html

[Slater]

http://www.yousendit.com/transfer.php?action=download&ufid=8BF2760600902793

Here it is. As you can see, it only has a .jpg extension

[Mithrandir]

Huh. I don't know. That's pretty weird. I don't see any archive file on this end, but that may be because my system is a mac and doesn't see it.

[Authority3000]

Winrar doesn't seem to recognize it directly, I had to go to the file's properties and change the program it starts with from Windows Fax and Image Viewer to Winrar. Then, when clicked, it extracted a working WMV file.

[Mithrandir]

AH!

I bet someone just couldn't post it with it's old extension, so then changed it.

[Slater]

yeah, but at the same time it is a valid .jpg file

[Kaligraphic]

Yeah, it's valid as both types... strange. Not quite as covert as hiding all your stuff in alternate file streams in an NTFS environment, but pretty cool.

[Mithrandir]

It's possible the video stream portion of the video is just a single jpeg graphic. That might give the results you are observing.

[Bobtheduck]

I heard of something similar where pictures were being put into MP3 files... This is really weird

[Slater]

I found another one just now. The .jpg file in WinRAR has the installer to a game trial.