New York The Telekom subsidiary T-Mobile US has become the target of a cyber attack. On January 5, it was found that a third party was accessing data without authorization, T-Mobile US announced on Thursday after the US stock market closed. With the help of external experts, the source of the attack was found and stopped within a day of becoming known.
The investigations were still ongoing. It cannot be ruled out that high costs were incurred as a result of the attack, which began on or around November 25.
According to this, the hackers were able to access the data of around 37 million customers and see names, billing and e-mail addresses, telephone numbers, dates of birth and bank account numbers. Based on current knowledge, the attacker was not able to access any other sensitive data, it said.
The successful attack represents the second major IT security leak at T-Mobile US in two years, as reported by the Wall Street Journal. Shares fell more than 2 percent in after-hours trading.