[Cryptography] rare sighting of that shy beast known as steganography:

[Ian G]

http://www.trendmicro.com/vinfo/us/security/news/cyber-attacks/operation-tropic-trooper-infiltrates-secret-keepers

...
" The Trojan, TROJ_YAHOYAH, eventually downloads and decrypts a 
malicious image or decoy file. The downloaded images appear harmless and 
look similar to default wallpapers in Windows XP systems. However, 
encrypted into them via simple steganography is BKDR_YAHAMAM, a malware 
that steals data from the system, kills processes and services, deletes 
files and directories, puts systems to sleep, and performs other 
backdoor capabilities."

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