SK Telecom reported on the 22nd that signs of customer SIM card-related information being leaked due to malware were discovered on the 19th. SK Telecom noted that it will actively cooperate with the government investigation and strengthen its security system moving forward.
According to SK Telecom, the company discovered signs of some customer SIM card-related information being leaked due to malware around 11 p.m. on the 19th.
SK Telecom stated, "We are currently continuously identifying the exact cause, scale, and items of the leak."
SK Telecom reported that it notified the Korea Internet & Security Agency (KISA) of the incident on the 20th, the day after the accident, in accordance with related laws. It also explained that it reported the signs of the data leak to the Personal Information Protection Commission at 10 a.m. that day.
After recognizing the possibility of the leak, SK Telecom immediately deleted the malware and isolated the suspected hacking devices. It also reported that, so far, there have been no confirmed cases of the leaked information being misused.
SK Telecom announced that it will conduct a thorough investigation of the entire system and strengthen measures to block illegal SIM cloning and abnormal authentication attempts. It noted that it will promptly notify users if signs of potential harm are discovered.
The company will post this information on its website and offer free SIM protection services through its website and T World to customers who wish to take additional safety measures.
SK Telecom stated, "We will do our best to reinforce the security system further to prevent such incidents from occurring again and to establish measures for protecting customer information."