Rudd said the government did not know if the attack was directed by a foreign government.
Several of the Scotland's newspapers lead with the cyber-attack that affected services run by most of Scotland's health boards.
She stressed there was no evidence that patient data had been accessed. Patients were asked not to come to hospitals unless it was an emergency.
The NHS has not been affected in Wales and Northern Ireland.
IT experts are rushing to fix the computer systems of around 40 NHS trusts and several GP practices in England and Scotland that were hit by a cyber attack yesterday.
A spokesman for Nissan in the United Kingdom confirmed the vehicle manufacturer had been affected by the cyber attack, saying it was first hit at around 9pm on Friday and the incident is "ongoing".
"I would expect NHS trusts to learn from this and to make sure that they do upgrade".
She added that lessons may need to be learned in the wake of the breach, which has affected NHS services across England and Scotland.
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The NHS was working on Saturday to bring its systems back online after it became the highest-profile victim of the so-called WanaCrypt0r attack and faced renewed concern about the strength of its infrastructure.
NHS Western Isles, NHS Fife and NHS Borders also said they had, to some degree, been disrupted.
"I hope the answer is yes, that is the instructions that everybody has received in the past".
"This is not targeted at the NHS, it's an global attack and a number of countries and organisations have been affected", she added.
Ciaran Martin, who leads the National Cyber Security Centre - part of GCHQ - said it was doing "everything in our power" to get "vital services" back up and running.
Finance chiefs from the Group of Seven rich countries will commit on Saturday to join forces to fight the growing threat of worldwide cyber attacks, according to a draft statement of a meeting they are holding in Italy.
Those responsible have not been identified yet.
"But our commitment is we will be as open as we can be, as soon as we can be, as our investigation continues".
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Because of this, the Italian government has declared 2017 as the Year of the Village to boost tourism in these areas. Life in Bormida is "simple and natural", according to the Oddone Giuseppe manager of the town's four restaurants.
The hackers used a technique that locks users' files unless they pay money in bitcoins.
The spread of the ransomware capped a week of cyber turmoil in Europe that began the previous week when hackers posted a trove of campaign documents tied to French candidate Emmanuel Macron just before a run-off vote in which he was elected president of France.
With the cyber attack, the software of NHS was blocked and doctors were blocked from patient files.
Convicted hacker Jake Davis also told the programme: "The most terrifying thing about this is how simple it is".
"If large numbers of NHS organisations failed to act on a critical notice from Microsoft two months ago, then whose fault is that?"
Russia's interior ministry said that some of its computers had been hit by a "virus attack" and that efforts were underway to destroy it.
However, computers already affected can not avail this solution.
A number of Spanish firms - including telecoms giant Telefonica, power firm Iberdrola and utility provider Gas Natural - suffered from the outbreak.
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