Microsoft announced Monday that it has taken legal action seeking to disrupt a major cybercrime digital network that uses more than 1 million zombie computers to loot bank accounts and spread ransomware. Experts consider the botnet a major threat to the U.S. election. The operation to knock offline command-and-control servers for the criminal infrastructure known as Trickbot was launched with a court order Microsoft obtained in Virginia federal court last week. It’s difficult to know how effective it will be. A reported attempt by U.S. military cyberwarriors to knock the network offline was ultimately unsuccessful.