How a little known Delhi-based cyber firm became top spy for hire

While the private investigators pleaded guilty to conspiring to hack into computers, Gupta and two others continued to face charges of conspiracy as of July 2015

Until earlier this month, chances are you would've never heard of Sumit Gupta and his firm BellTrox InfoTech Services. This little-known firm based in the Shakurpur area of New Delhi has been accused of being one of the largest “spy-for-hire” operations ever exposed.

However, the cybersecurity community in India was not surprised. “It’s just a matter of who gets caught. A lot of people do this kind of work, but it's a matter of covering your tracks well,” says a Mumbai-based hacker.

According to revelations made by Canada-based Citizen Lab, and first reported by Reuters, the underlying technology BellTrox used