Barring sporadic incidents in a few states, most institutions and industries across India continue to remain insulated from the effects of the ‘WannaCry’ ransomware cyberattack that has affected computers in approximately 100 countries worldwide.

Banks, government departments and corporate houses have issued messages of caution and reinforced online security. However, business was unaffected as markets and offices opened on Monday after a weekend during which ripple effects of the malware were witnessed across the globe.

For now, the RBI has asked banks to operationalise their ATM networks only after software updates are installed+ .

The social network was abuzz with talk on Monday that ATMs in many places were not functional. However, bankers said this was likely because the machines had run out of cash.

Corporate houses urged employees to back up their data and refrain from opening unfamiliar file attachments. “We are also urging all Windows users to install software upgrades and firewalls,” said the IT head of a media group.

The broking and mutual fund industries were not affected by the malware attack, said top officials. “All exchange operations went on normally,” said Ashishkumar Chauhan, MD & CEO, BSE.

In Kerala, computers in panchayat offices in Wayanad and Pathanamthitta districts were affected. “The staff found Microsoft Word and MS Office files inaccessible,” said Thariyode panchayat president Reena Sunil.

Computers in at least three locations in West Bengal, including those of a power discom, also came under attack.

“The disruption caused was local. It did not affect power distribution, customer data or commercial operations,” said West Bengal State Electricity Distribution Co Ltd MD Rajesh Pandey.