New York: The U.S. Justice Department ?on Thursday said it ?took part in an operation with Germany and ?Canada to take down infrastructure used by four major botnets that infected more than 3 million devices worldwide, including hundreds of thousands ?in the ?U.S. The ?malicious networks – Aisuru, KimWolf, JackSkid and Mossad – were used to launch ?distributed denial-of-service (DDoS) attacks, with some Department of Defense websites among the ?targets, the Justice Department said.Also Read: Why businesses can no longer treat cybersecurity as an IT problemMost infected devices were part of the so-called Internet of Things, or web-connected appliances like…