Hacker Stole Data of Over 70% Bulgarian Citizens from Tax Agency Servers

Eastern European country Bulgaria has suffered the biggest data breach in its history that compromised personal and financial information of 5 million adult citizens out of its total population of 7 million people.

According to multiple sources in local Bulgarian media, an unknown hacker earlier this week emailed them download links to 11GB of stolen data which included taxpayer's personal identifiable numbers, addresses, and financial data.

In a brief statement released Monday, the National Revenue Agency (NRA) of Bulgaria said the stolen data originates from the country's tax reporting service.

The NRA also indicated that the Ministry of the Interior and the State Agency for National Security (SANS) have started taking an assessment of the potential vulnerability in NRA's systems that attackers might have exploited to breach into its databases.

It appears that until now, the hacker, who claimed to be a Russian man, has only released 57 out of a total of 110 compromised databases, which is about 21GB in total.

In a follow-up announcement, the NRA said almost 20 days ago, the attacker unauthorizedly accessed about 3 percent of the information contained in their databases.

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