Microsoft took control of domains used by cybercriminals as part of the infrastructure needed to launch phishing attacks designed to exploit vulnerabilities and public fear resulting from the COVID-19 pandemic. Threat actors who controlled these domains were first spotted by Microsoft s Digital Crimes Unit (DCU) while attempting to compromise Microsoft customer accounts in December 2019 using phishing emails designed to help harvest contact lists, sensitive documents, and other sensitive information, later to be used in Business Email Compromise (BEC) attacks.
Source: https://www.bleepingcomputer.com/news/security/microsoft-takes-down-domains-used-in-covid-19-related-cybercrime/