US EditionSK Telecom Says Malware Breach Lasted 3 Years, Impacted 27 Million Numbers
- On April 19, 2025, SK Telecom, South Korea’s largest mobile carrier, identified a malware attack that compromised the Universal Subscriber Identity Module details of approximately 27 million users.
- The malware infection started in June 2022 and went undetected for nearly three years, impacting 23 servers containing SIM-related data.
- The breach compromised information such as subscriber identities, SIM authentication credentials, details on network activity, and stored messages or contact lists, thereby heightening the threat of SIM-swap attacks.
- SK Telecom stated that they have implemented technical measures to fully prevent unauthorized changes to USIM cards and devices, and committed to accepting complete responsibility for any resulting damages.
- SK Telecom temporarily halted accepting new subscribers, provided complimentary SIM card replacements to customers, and intends to bolster its security protocols while collaborating with authorities to prevent similar breaches in the future.
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17 Articles
(Seoul = Yonhap News) Reporter Kim Joo-hwan = A hacker group supported by the Chinese government is being pointed out as the one behind the hacking of SIM card information for SK Telecom [017670].
Reporter Kim Jeong-hyeon and Yang Sae-rom = The SK Telecom intrusion incident public-private joint investigation team held a briefing on the second investigation results on the 19th and announced, "The scale of the leaked SIM card information announced in the first investigation results was 9.82 GB, which is 26,957,749 cases based on the subscriber identification key (IMSI).
SK Telecom says the breach disclosed in April first began in 2022 and ultimately exposed the USIM data of 27M subscribers
Bill Toulas / BleepingComputer: SK Telecom says the breach disclosed in April first began in 2022 and ultimately exposed the USIM data of 27M subscribers — SK Telecom says that a recently disclosed cybersecurity incident in April, first occurred all the way back in 2022, ultimately exposing the USIM data of 27 million subscribers.
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