WannaCry virus: Businesses brace for Monday as ransomware threat lingers

New versions of worm were expected, and extent of damage from Friday's attack was still unclear

Technical staff scrambled on Sunday to patch computers and restore infected ones, amid fears that the ransomware worm that stopped car factories, hospitals, shops and schools could wreak fresh havoc on Monday when employees log back on. 

The spread of the virus dubbed WannaCry — "ransomware" which locked up more than 100,000 computers — had slowed, cybersecurity experts said, but they warned that the respite may be brief.

New versions of the worm were expected, and the extent of the damage from Friday's attack was still unclear.

Marin Ivezic, cyber security partner at PwC, said that some clients had been