Malaysian internet regulators are investigating a reported attempt to sell the data of over 46m mobile users online in the Southeast Asian country.

The breach was first reported by Malaysian tech publication Lowyat.net after it received a tipoff that someone was trying to sell the information on its forums.

Following the news, the Malaysian Communications and Multimedia Commission (MCMC) has said it is looking into the matter with the police.

“We have identified several potential sources of the leak and we should be able to complete the probe soon,” said Salleh Said Keruak, Malaysia’s communications and multimedia minister.

The leaked data, which was last updated between May and July 2014, includes postpaid and prepaid mobile phone numbers, customer details, addresses, and SIM card information – such as unique IMEI and IMSI numbers.

The Malaysian breach shares similarities with the data breach suffered by Equifax. The credit rating firm was hit by a cybersecurity incident earlier this year that saw around 143m US customers, and nearly 700,000 UK customers, have their data compromised. Amongst the data stolen was phone numbers, membership details, email addresses, and driving license numbers.

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