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Mark acknowledged this. and i said, do you think you can get the data back? and he said, not always. i would say not at all. almost not at all. it's out there and it's never coming back. so that's the problem. these huge data sets that are so valued by marketers and so valued by the russians, everybody values them. so that's really the problem is this ocean of data that is now out there and not subject to scrutiny. >> care ra, does mark, do you think does he realize how badly some people in congress want to skewer him at a hearing? >> well, you know, it's interesting. it's a big question. he s...

In? >> cara, for a lay audience, what happened here? did facebook users get used as much as facebook, the platform, and its creator got used? >> oh, you know -- facebook released a statement saying they were outraged. was outraged by their outrage. what they did is they gave this group data which they've done for years, which they've cut back on that rather significantly the last two years. they gave this data away, then they didn't monitor it. they signed agreements with the people they gave the data to but there was no enforcement. like making laws and having no police. right now one of the ...

The ability to stop this? >> i think the interesting thing here is they may be bank robbers and they may not be. >> we don't know who either? >> i don't think we yet know. ransomware traditionally is the bank robber. give me money, you can have your data bank. in this case there are some signs that point to doing it not just for monetary reasons but for political reasons. but the targeting of ukraine, usinging a ukrainian path sugge this might have a political path as well. there's money to be sent. i can't necessarily blame companies. had they do a cost benefit analysis when they say i could ...

Of targets all received this ominous message. in english, on their screens, your files are no longer accessible. nobody can recover your files without our decryption service. send $300 worth of bitcoin. >> they might not give you your data back, but hit you again and say give me more money. >> reporter: the attack bears great similarities to a similar computer kidnap and ransom scheme last month, that hit british hospitals particularly hard. but that attack, later linked to north korea, was stopped when cyber security experts discovered a kill switch. >> and brian ross joins us now. as you men...

Countries worst hit by the hack. nina, to you first. samuel was saying it is too soon to point a finger of blame. now that we moved on, can we say for sure with any certainty who might be behind it? >> not for sure. cyber security experts say it is probably a criminal gang trying to ransom people's data to get a lot of money rather than state sponsored cyber attack which is the type of thing we heard a lot about in the last six months or a year. essentially esshe is explaininge tools which was leaked in march, 20 years of cyber charge to ransomware demand for money, encrypting people's informa...