Security News > 2021 > December > T-Mobile says new data breach caused by SIM swap attacks
T-Mobile confirmed that recent reports of a new data breach are linked to notifications sent to a "Very small number of customers" who fell victim to SIM swap attacks.
SIM swapping makes it possible for attackers to take control of a target's mobile phone number by tricking or bribing the carrier's employees to reassign the numbers to attacker-controlled SIM cards.
T-Mobile was the victim of multiple data breaches during the last four years, including a very similar one in February 2021 when attackers used an internal T-Mobile application to target up to 400 customers in SIM swap attempts.
In February 2021, threat actors targeted hundreds of users in SIM swap attacks after gaining access to an internal T-Mobile application.
The FBI shared guidance on defending against SIM hijacking attacks following an increase in the number of SIM hijacking attacks targeting cryptocurrency investors and adopters.
T-Mobile is yet to reply to a request for more info on the total number of affected customers and the method used by the attackers to pull off the SIM swap attacks successfully.
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