warriors. tonight, we take you inside those teams, a look at who they are, and the tools they use. tonight, moscow says the hacking allegations against russia are groundless. vladamir putin's spokesman challenging america to prove them. but u.s. officials say the russian hacks continue around the clock, fishing attempts targeting private e-mail attempts associated with hillary clinton's campaign as recently as december 6th. >> it's a continuing effort to collect intelligence. >> reporter: adam myers investigated the russian hacks for the democratic party. he and other experts have new information tonight on operations inside putin's hacking teams, which they say are as talented as they come. >> when it comes to espionage and offense, they are fantastic. they are close to the best in the world. probably right after our own here in the united states. >> reporter: they discovered a russian hacking team called cozy bear penetrated the dnc in the