Associate Professor of Computer Science John Aycock and student Nathan Friess at the University of Calgary (Canada) discovered that cyber criminals can fool almost all spam filtering tools after gathering all personal information. on computers such as e-mail writing style, length of messages, habits of using uppercase, abbreviations, signatures .
Aycock and Friess stated the main reason that the system filtered and users recognized spam: "Spam usually comes from unidentified sources and looks unreliable. However, the new 'high-end' spam This will change the appearance of spam thanks to the data they have. "
Aycock also emphasized: " The zombie system is not only a springboard for denial of service or spam. They also contain huge amounts of information ."