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Government test facility in idaho falls with a team of cyber experts is busy identifying hackers and trying to stop them. >> is it difficult for some sort of a cyberattacker to take down a power grid? >> it's much more simple than we would like it to be. >> to show us just how simple it is, the cyber team recreated the ukraine attack. a hacker using a common e-mail phishing scam steals a an employees credentials, takes full control of the computer operating the power grid and shuts it down. >> in the ukraine power was knocked out to several of their substations. >> correct. >> could that happe...

Thousands of u.s. computer systems that control critical infrastructure. the code known as black energy has been linked to russia. >> there are companies across the country, this is not just with respect to electricity companies, that don't fully appreciate the nature of the threat. >> 75 to 80% of the nation's critical infrastructure is owned and operated by private sector companies, despite many warnings, dhs says some companies have failed to take even basic cybersecurity measures. >> it comes down to a business decision for the company. >> a business decision that could allow attackers to ...

Happened. a recent study found that 94% of americans fear a cyberattack second only to an attack by isis. >> so what happened is one of these large breakers, several of the large braerks, operated remotely by the attacker. >> it was the fist known cyberattack of its kind, three attacks, 30 minutes apart against three electrical substations serving ukraine's power grid. >> this is not theoretical, this has happened. we've now had a cyberattack on critical infrastructure was that destructive. >> destruct ty and a real threat to the united states, says susan spaulding. a power outage impacts ever...

Run by the underground systems. >> reporter: the malicious code identified as having played a role in ukraine's attack is the same code dhs recently admit is in hundreds if not thousands of u.s. computer systems that control critical infrastructure. the code known as black energy has been linked to russia. >> there are companies across the country and this is not just with respect to electricity companies, that don't fully appreciate the nature of the threat. >> reporter: 75% to 80% of the nation's critical infrastructure is owned and operated by private sector companies. despite many warnings...

They strike. >> reporter: russian malware is in hundreds if not thousands of computer that hold information, and americans fear cyberattack second only to an attack by isis. >> what happened is one of the large breakers or several of the large breakers were operated remotely by the attacker. >> reporter: it was the first-known cyberattack of its kind. three attacks 3 minutes apart -- 30 minutes apart, against three electrical substations serving ukraine's power grid. >> this has happened. we've had a cyberattack on critical infrastructure that was destructive. >> reporter: destructive and a re...