The name of the bio-weapon containing nanobots that infect like a virus in the 2021 film "No Time to Die" is Heracles. In this film, James Bond has left active service with MI6. He is subsequently recruited by the United States CIA to find a kidnapped MI6 scientist Valdo Obruchev. With M's approval Obruchev developed Project Heracles. It is the bio-weapon that contains nanobots that are coded to an individual's DNA, rendering it lethal to the target and their relatives but harmless to others. This weapon is used against Ernst Stavro Blofeld, his organization, and several others.

Some required actions between Bond and Blofeld (a true powerful adversary of Bond) lead to a showdown between the two men and results with Bond facing an ultimate challenge that no one wants to face but everyone will face in his/her life.

More Info: en.wikipedia.org