https://www.vice.com/en_us/article/dyv87z/cockli-admin-russian-intelligence-svr-fbi-dhs-cisa-report

On Monday the FBI, DHS, and CISA—the U.S. government agency focused on defensive cybersecurity—published a report laying out the tools, techniques, and capabilities of the SVR, the Russian foreign intelligence service that the U.S. has blamed for the wide-spanning Solarwinds supply chain hack. That report said that the SVR makes use of a specific anonymous email service called cock.li.

The administrator of cock.li has now told Motherboard that this is the first time he has heard of the SVR using his service, but that "it's hard to surprise me nowadays."