The dramatic data-scrambling attack that hit computers around the world appears to be contained. But with the damage and disruption still coming into focus, security experts worry the sudden explosion of malicious software may have been more sinister than a criminally minded shakedown of computer users. <br/><br/>The rogue programme initially appeared to be ransomware, a fast-growing and lucrative breed of malicious software that encrypts its victims' data and holds it hostage until a payment is made.Problems have been reported across the shippers' global business, from Mobile, Alabama, to Mumbai in India.