A couple of months ago, I read a blog post about malware, cryptominers and WAV file steganography: malware authors are concealing cryptominers in sound files (WAV) using steganography. Each bit of the cryptominer executable is stored as the least-significant bit of each Pulse Code Modulation value (16-bit values in this example).
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Read the complete article: Video: Stego & Cryptominers, (Sun, Feb 2nd)