Big firms that lose data to cyber-spies normally know whom to blame. "It's always the Chinese", says Snorre Fager-land of Norman Shark, a security firm in Oslo. Yet on May 20th it revealed that a recent attack on Telenor, a Norwegian tele-coms firm and one of the world's largest mobile operators, was probably directed from India. Though South Asia boasts plenty of troublemakers, says Mr Fager-land, no orie had yet caught Indian hackers in such a well-planned assault. The Telenor attack is one of several which security experts are pinning on a single Indian group, provisionally named HangOver. Most of the other assaults targeted computers in Pakistan. Since 2010 these hackers have hidden malware in documents that purport to contain Indian government secrets, presumably hoping to infect systems run by Pakistani military or intelligence services. Separatist groups within India are a target, too.
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