SK Telecom confirmed to like a malware -infection on a Saturday night The attackers tried to steal usim -data Law enforcement and government have been notified
SK Telecom, South Korea’s largest telecommunications provider, recently suffered a malware infection through which threat players tried to get the USIM information.
The attack happened in mid -April 2025 at night between Saturday and Sunday when most employees were gone this weekend.
The company’s IT team discovered penetration and moved quickly to isolate the affected final points and prevent more data from being stolen. In the morning, SK Telecom informed relevant authorities and started an investigation to determine exactly what happened and what was stolen.
Github not affected
So far, no data appeared on the dark web and no one took responsibility for the attack.
An Universal Subscriber Identity Module is the sequel to the old SIM card. It is used in 3G, 4G and 5G mobile networks and is found in most devices with cellular connection.
In its core authenticate an USIM device’s identity on a network, stores subscriber data (international mobile subscriber identity, approval keys, contacts and sometimes text messages), encrypts the information passing through, and provides secure access to mobile services such as calls, data or texts.
A cyber criminal could use the data to close SIM, track People’s location, Bypass App Security or Eavesdrop on communications.
In other words, this was a rather dangerous attack. Therefore, the company strengthened blocks of USIM swaps and abnormal approval attempts. Furthermore, it said it would immediately suspend the service of accounts associated with suspicious activity.
SK Telecom is the largest telecommunications provider in South Korea serving about 34 million subscribers (about 49% of the market). The rest is mostly divided between KT and LG U+.
It offers mobile services, internet and IPTV, AI and Cloud Services, IoT Solutions, Smart Factory and Connected Car Technology, Quantum Cryptography Communication and more. It was one of the world’s first companies that launched commercial 5G back in 2019.
Via Bleeping computer
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