>> so, the suspicions are that this is a criminal motive. why? because they're asking for money. >> reporter: $300, to be exact. here's what an infected computer 30lls the user to do-- pay up in the cryptocurrency bitcoin to get your files back. cyberattacks, say the experts, are here to stay, especially ransomware, and they could get much more sinister. >> you can imagine a future where maybe, conceptually, they are able to infect a defibrilator or insulin pacemaker or automobile, or something like this, which is the ultimate ransom. >> reporter: that's a terrifying prospect. >> and i think it's-- it's a not-unforecastable future. >> reporter: the experts also say that there was a software fix available to protect against petya, but not everybody has heen keeping their cyber- atcurity up to date. today's attack, anthony, should e- a wake-up call.