27 mil. user records leaked in SK Telecom data breach
Approximately 27 million user information records were confirmed to have been compromised in a major cyberattack on SK Telecom last month, the government-private sector investigation team announced, Monday. The figure surpasses SK Telecom’s total customer base of 25 million, with new findings showing that malware was also detected on servers that stored users’ device identifiers, likely making the incident one of the worst telecom security breaches in the country’s history. According to the investigation team, a forensic analysis of around 30,000 of SK Telecom's Linux-based servers revealed that 23 had been infected. Investigators identified 25 different types of malware during the probe. The leaked data amounts to 9.82 gigabytes and includes 26.95 million records, primarily containing International Mobile Subscriber Identity (IMSI) data — a critical identifier used to authenticate users on mobile networks. Along with IMSI, the team also reported that approximately 290,000 International Mobile Equipment Identity (IMEI) data records were stored in two compromised servers, raising
