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A major reason for the increase is the growing practice among cybercriminals to use legitimate TLS-protected cloud and Web services such as Google cloud services, Pastebin, Discord, and Github for hosting malware or storing stolen data, and for their command and communication operations. Also contributing to the growth is the increased use by attackers of Tor and other TLS-based network proxies to encrypt communications between malware and the threat actors behind them, Sophos said. The main takeaways are that there is no such thing as a safe domain or service when screening for malware, and that more traditional firewall defenses based on reputation scanning without deep packet inspection cannot protect systems, says Sean Gallagher, senior threat researcher at Sophos.