iFrame attack injects code via PNGs

Posted on Posted in Hacker News

Security vendor Sucuri is warning that it’s spotted an attack in the wild that embeds malicious code in PNG files.

The iFrame injection attack loaded a valid jquery.js file with very little to alert even the researcher that something else was going on. As the company writes in this blog post, the only red flag in the code was a loadFile() function downloading dron.png into the iFrame.

 securus_iframe_png_payload

 

 

 

As Sucuri’s Peter Gramantik writes, the loading of the PNG is followed by a decoding loop, and this is where life gets more interesting. The decoding loop, he writes, is “taking the normal behaviour of an iFrame injection, embedding it within the meta of the PNG file, and just like that we have a new distribution mechanism.”

So the user doesn’t notice anything happening, the iFrame is loaded at -1000px – meaning it’s placed off-screen.

Quelle: the Register

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