Nearly a quarter of malware now communicates using TLS

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Encryption is one of the strongest weapons malware authors can leverage: They can use it to obfuscate their code, to prevent users (in the case of ransomware) from being able to access their files, and for securing their malicious network communication.
As websites and apps more widely adopt TLS (Transport Layer Security) and communicate over HTTPS connections, unencrypted traffic may draw even more attention, since it’s easier for analysts and security tools to identify malicious communication patterns in those plain HTTP sessions. Malware authors know this, and they’ve made it a priority to adopt TLS and thereby obfuscate the contents of malicious communication.

Source(full read)- https://news.sophos.com/en-us/2020/02/18...using-tls/