This means that code can be hidden within the image. GIF files are special because they have multiple encoded frames. When this happens, the app parses the GIF to show a preview of the file. The hack works by taking advantage of the way that WhatsApp processes images when the user opens the Gallery view to send a media file. In October 2019, security researcher Awakened revealed a vulnerability in WhatsApp that let hackers take control of the app using a GIF image.
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