Overview

• SK Telecom reported a hacking incident involving the partial leakage of customer SIM/USIM data caused by malicious code inserted by unidentified hackers.
• The breach was detected on Saturday, prompting the company to delete the malicious code, isolate affected systems, and notify regulatory authorities including the Korea Internet & Security Agency.
• No evidence of misuse of the leaked data has been identified so far, according to SK Telecom's latest statement.
• The company has strengthened security protocols, including blocking illegal SIM changes and abnormal authentication attempts, and is offering free SIM protection services to customers.
• A comprehensive investigation into the breach is underway as SK Telecom works to prevent similar incidents in the future.