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T-Mobile has confirmed that it was targeted in a recent wave of telecom breaches reportedly conducted by Chinese threat actors aimed at obtaining access to private communications, call records, and information regarding law enforcement requests.

In a statement to the Wall Street Journal, T-Mobile assured that although this industry-wide attack is being closely monitored, there has been no significant impact on T-Mobile's systems or data, and they have found no evidence of any compromise of customer information. The Wall Street Journal was the first to report this breach.

"We are maintaining vigilance, collaborating with industry peers, and working alongside relevant authorities to monitor the situation," a T-Mobile spokesperson shared.

BleepingComputer received a similar reassurance from T-Mobile, stating that there is no evidence of customer data being accessed or extracted. "Thanks to our robust security measures, network architecture, and proactive monitoring, T-Mobile has not experienced significant impacts," the company elaborated after the story's release.

"There is no evidence of any unauthorized access or exfiltration involving customer or sensitive information, which may have affected other companies," the spokesperson added.

The Wall Street Journal reported last month that multiple U.S. telecommunications companies, including AT&T, Verizon, and Lumen, were breached by a Chinese state-sponsored group known as Salt Typhoon.

Operating under aliases such as Earth Estries, FamousSparrow, Ghost Emperor, and UNC2286, the Salt Typhoon group is a sophisticated hacking organization supported by the Chinese state, active since at least 2019. Their primary targets are often government entities and telecommunications companies, particularly in Southeast Asia.

According to WSJ, this cyber campaign targeted the cellphone lines of senior U.S. national security and policy officials, allowing threat actors to access call logs, text messages, and some audio communications.

The U.S. government, in a recent joint statement by the FBI and CISA, confirmed these breaches, where the actors accessed call data, communications from targeted individuals, and information regarding law enforcement requests made to telecom companies.

"We have confirmed that actors affiliated with the People's Republic of China have infiltrated networks across several telecommunications companies to steal customer call record data, compromise the private communications of a select group of political or government-affiliated individuals, and copy sensitive information from U.S. law enforcement requests processed under court orders," the joint statement disclosed. "Our understanding of these breaches is expected to deepen as investigations proceed."

Reports suggest these attacks leveraged vulnerabilities in Cisco routers, which manage internet traffic routing. However, Cisco has previously stated that there is no evidence of their equipment being compromised in these attacks.

This incident marks the ninth breach T-Mobile has faced since 2019, alongside several others.

Update 11/16/24: Statement from T-Mobile included.