Saudi authorities have detected fresh attempts by hackers to disrupt government computers. A report said Security firm Symantec warned of a revival of malware used in previous cyberattacks. Arab News reported that the National Cyber Security Centre,NCSC detected destructive electronic strikes against several government agencies and vital establishments.<br/><br/>The newspaper commented that NCSC had warned on November 19 of organised threats aimed at disabling the services provided by some agencies. Hackers based outside the kingdom were trying to implant malware or a virus to disrupt users' data. Symantec said on Tuesday that the aggressive disc-wiping malware Shamoon has made a surprise comeback and was used in a fresh wave of attacks against targets in Saudi Arabia.