From bleepingcomputer.com
Yesterday, a researcher disclosed a method of hiding up to three MB of data inside a Twitter image.
In his demonstration, the researcher showed both MP3 audio files and ZIP archives contained within the PNG images hosted on Twitter.
Although the art of hiding non-image data in images (steganography) isn’t novel, the fact that the images can be hosted on a popular website like Twitter and are not sanitized opens up a possibility for their abuse by malicious actors.