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People having to click a link on a fishing e-mail. it takes over the computers and demands $300 in bit coin for access to their files again. what's most troubling, it isn't just effecting big companies and individuals, it is also effecting hospitals. in the uk, multiple hospitals had to cancel outpatient appointments because their computers have been effected. at the root is a flaw in windows which microsoft has been trying to correct since march. but it can only be fixed if you, the user, do the security update. so often you get that notification in the lower right corner, don't want to resta...

Investigati investigations on patients. >> reporter: millions of computers in more than 70 companies have been affected including the russia's interior m ministry, and chinese universities and tennessee-based fedex and although it is based in the u.s., they largely dodged bu bullet. the spam is called wannacry. and the it is vastly expands across the company, and demands 3$300 in bit coin to gain acces. they say that the virus is going to exploit holes in software security first identified by het national security agency and then leaked by hackers. the goal ist not patient files or data, but j...

Moved to an online currency bit coins. all hackers, online currency is what people use to maintain anonymity, not to being tracked heavily. the whole online currency is designed to be anonymous. you're paying not directly into somebody's bank or doing a wire transfer you're paying into this online currency area and that's extremely difficult for law enforcement to go back and track. they used to be able to track through money laundering to find these individuals but unfortunately it's very difficult to track these folks through bit coin and that's where this whole ransom ware has boomed becaus...

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...

Some of those bit coin accounts have started filling up, there's no evidence of which big organizations have paid any of these ransoms and here in the uk it's doubtful that the organization like the nhs would daso. >> i want to bring in you in moscow. what is the russian government saying about this and the scope of this hack given as nina was just saying. it's not just public data and public computers that have been access, also some personal data, as well, really at the heart of the russian government. >> that's right. russia's interior ministry said that 1,000 of its computers were compromi...