No major incident yet in the country, but central bank, stock exchanges, other vital institutions told to bolster defences; companies rush to protect computer systems.The government’s cybersecurity arm has asked the central bank, stock exchanges, the National Payments Corp. of India (NPCI) and other vital institutions to safeguard their systems against the latest cyberattack that has infected thousands of systems globally and may escalate further. The Indian Computer Emergency Response Team (CERT-In), the central agency coordinating efforts on cyber security issues, has issued a “critical alert” and has advised the installation of relevant “patches” to protect against any data breaches. The virus dubbed Wanna Cry, a so-called ransomware, has locked up more than 100,000 computers and sent cybersecurity experts scrambling on Sunday to patch computers and restore infected ones. Experts fear that the ransomware worm that stopped car factories, hospitals, shops and schools in more than