Among Asian countries, Indians are the most affected in ransomware, which extorts payments for access to a computer system that it has disabled, according to the 2013 Norton Report.
About 11 per cent of Indian respondents said they had been affected by such targeted attacks which started becoming prominent over the past year, the report added.
Releasing the report on Tuesday, Ritesh Chopra, country manager of Norton, said India is among the top five victims of cybecrime and lost about $4 billion to such incidents. The estimated average cost per victim also rose from $192 to $207, he said.
The report says that while 50 per cent of online adults have fallen victim to cyber attacks, about 56 per cent have been affected by cyber bullying or stalking.
"Ransomware is very targeted and is often in the form of multiple malware put together," Chopra said, adding that many of them are in the form of fake anti-virus software that disable many functions of the computer.
With more Indians becoming connected, their susceptibility to attacks is also on the rise. For instance, while 63 per cent smartphone users have been victims of mobile cybercrime, only 29 per cent of them have mobile security software. About 53 per cent are not even aware that such solutions exist and about 40 per cent don't use basic precautions like password protection or file backup.
The only positive fact is that seven out of ten Indians don't put anything on social networks that they wouldn't want their parents or children to see.
The study was conducted over 13,022 online adults aged between 18 and 64 in 24 countries.