While still relatively unusual, security researchers report a 600% upsurge in steganographically-based attacks in 2017. Cybersecurity attackers use steganography to inject malicious content to slip past security defenses and exfiltrate misappropriated content from compromised systems.
Article Link: https://blog.fortinet.com/2018/02/21/steganography-combatting-threats-hiding-in-plain-sight