known as reevil has compromised the computer systems of at least 1,000 businesses worldwide by targeting an american it provider, that writes and updates their software. one of those affected is sweden s co op supermarket, which has had to close some 500 outlets that s more than half its stores because tills and self service checkouts had stopped working. reevil has tailored its ransom demands to the size of each respective company, but on sunday said it would settle the lot for $70 million if someone were prepared to pay it. kieron martin is the founder of the uk s national cyber security centre he says the attack was large scale and highly sophisticated. janik yesterday, they were giving away perishable foods, it wasn t just confined giving away perishable foods, it wasn tjust confined to fruits, and also the disruption involved was significant.