The Malaysian authorities investigating a massive online breach of data involving 46 million mobile phone users have traced the leak to an Internet Protocol address in Oman, the New Straits Times quoted the police chief as saying on Saturday. Vijandren Ramadass, the founder of tech portal Lowyat.net, uncovered the data leak – which is likely to have affected almost every Malaysian and possibly millions of tourists – when a user tried to sell the data on the portal’s forum last month. A cyber security services company warned that leaked data could be used by hackers to carry out social engineering attacks to trick users into divulging their details.