Ramsomware, a kind of malicious software, is designed to block access to a computer until a certain sum of money is paid. Generally, it targets individuals.

F-Secure India country head Amit Nath said there is a rise in botnet cases in India.

"India is also a center for botnets — as bot infecting viruses like Ramnit and Sality are rampant. PC's in a botnet are used mainly by hackers for distributed denial-of-service (DDoS), spamming and possibly bitcoin mining," he added.

Bot is short for robot. Cybercriminals distribute malicious software that can turn a computer into a bot. These bots can be networked together as 'botnet' that can perform automated tasks over the internet, without owners knowledge.

In mobile malwares, Chandigarh, Bangalore, Hyderabad, Chennai and New Delhi are thre top 5 infected cities, while tier II cities are becoming a favourite destination for mobile malwares.

"Many incidents as highlighted in our Threat report shows that cybercriminals constantly adapt to new trends whether by utilising new malware or targeted attacks techniques to continue with their attacks," Nath said.

In PC threats, of the top 10 detections, the largest share (31 percent) were of six-year-old Downadup/Conficker worm. The worm has infected millions of computers in over 200 countries, the report said.

This worm's long life is mostly due to computers that run old software — illustrating the importance of keeping a computer's software up to date, it added.

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