Hackers have targeted the U.S. government and private corporations around the world. In a recent incident hackers attached malware to a server pushed software update from Texas company SolarWinds. Cybersecurity firm FireEye says it believes the breaches were carefully targeted. Members of congress have started briefing members of congress about the hack. Russia has denied involvement in the attack; President Trump has not commented on the details of the hack, but officials say it is ongoing and has the "hallmarks of a Russian intelligence operation" The attack is the latest in what has become a long list of suspected Russian electronic incursions into other nations.