ProtonMail has been fighting off DDoS attacks that have affected its services for the past two days. The attacks have been attributed to a hacker group called Apophis Squad. The hacker group claims to be based in Russia but denies being Russian. The group says they were testing a beta version of a DDoS booter service the group is developing and preparing to launch. The company’s CTO responded to one of the attacks calling the group “clowns”” in a private conversation with Bleeping Computer.”
Source: https://www.bleepingcomputer.com/news/security/protonmail-ddos-attacks-are-a-case-study-of-what-happens-when-you-mock-attackers/