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A timeline of South Korean telco giant SKT’s data breach
- In April, SK Telecom in South Korea experienced a cyberattack resulting in the theft of data of approximately 23 million customers.
- SKT's CEO mentioned that around 250,000 users switched providers post-breach, a number expected to rise to 2.5 million if cancellation fees are waived.
- The potential financial impact could reach $5 billion over three years if cancellation fees are not enforced.
- SKT is actively investigating and considering this incident as its most severe security breach.
- Investigations by public and private entities are ongoing to determine the cause of the breach.
- Sensitive personal data like phone numbers and unique identifiers were compromised, presenting risks of SIM swapping and surveillance.
- SKT offered SIM card protection and replacements to prevent further damage following the breach.
- No secondary damage has been reported, and there are no verified cases of customer data misuse on the dark web.
- SKT detected abnormal activities on April 18, identified a breach on April 19, and reported it to authorities on April 20.
- A cybersecurity notice instructed SKT to replace Ivanti VPN equipment suspected to be linked to the breach, possibly related to China-backed hackers.
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