A new malware variant monitors a public Twitter feed that is used to post Command and Control commands via steganographic messaging in meme photos.
“When activated on an infected machine the Trojan began monitoring the Twitter feed for updates. The images contained hidden ‘print’ commands which told the Trojan to take a screen capture and send it back to its criminal controllers. That’s a trick malware creators will employ when they want to steal usernames, passwords, and credit card details from their victims.
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Source: Cybercriminals Are Controlling Malware Through Twitter Memes