Two reports published in the last few months show that malware operators are experimenting with using WAV audio files to hide malicious code.
The technique is known as steganography — the art of hiding information in plain sight, in another data medium.
In the software field, steganography — also referred to as stego — is used to describe the process of hiding files or text in another file, of a different format. For example, hiding plain text inside an image’s binary format.
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Source: ZDNet