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Pierluigi Paganini@Data Breach
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SK Telecom, South Korea’s largest mobile carrier, has suffered a significant cyberattack resulting in a USIM data breach affecting approximately 23 to 25 million subscribers. The breach was triggered by a malware infection that exposed sensitive information tied to users’ Universal Subscriber Identity Modules (USIMs), including mobile phone numbers and IMEI numbers. This incident has raised alarms across the telecommunications industry, prompting a reassessment of cybersecurity practices and highlighting vulnerabilities within SK Telecom's network.
To address the fallout from the breach, SK Telecom is offering free SIM card replacements to its affected customers. While the company serves roughly half of the domestic mobile phone market, only 6 million replacement SIM cards are initially available through May. This initiative aims to mitigate the risks of identity theft and SIM swap attacks, which could exploit the compromised USIM data. Additionally, SK Telecom is working to restore customer trust by increasing checks on SIM card replacement activities and monitoring authentication processes for suspicious behavior.
The cyberattack has had a substantial impact on SK Telecom’s market position and financial standing. An estimated $643 million in market capitalization has been lost, accompanied by a potential exodus of subscribers seeking more secure alternatives. The South Korean Ministry of Science and ICT and the Korea Internet & Security Agency (KISA) have launched an on-site investigation at SK Telecom’s headquarters, adding further pressure on the company to effectively manage the breach's consequences.
ImgSrc: securityaffairs
References :
To address the fallout from the breach, SK Telecom is offering free SIM card replacements to its affected customers. While the company serves roughly half of the domestic mobile phone market, only 6 million replacement SIM cards are initially available through May. This initiative aims to mitigate the risks of identity theft and SIM swap attacks, which could exploit the compromised USIM data. Additionally, SK Telecom is working to restore customer trust by increasing checks on SIM card replacement activities and monitoring authentication processes for suspicious behavior.
The cyberattack has had a substantial impact on SK Telecom’s market position and financial standing. An estimated $643 million in market capitalization has been lost, accompanied by a potential exodus of subscribers seeking more secure alternatives. The South Korean Ministry of Science and ICT and the Korea Internet & Security Agency (KISA) have launched an on-site investigation at SK Telecom’s headquarters, adding further pressure on the company to effectively manage the breach's consequences.
ImgSrc: securityaffairs
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References :
- BleepingComputer: South Korean mobile provider SK Telecom has announced free SIM card replacements to its 25 million mobile customers following a recent USIM data breach, but only 6 million cards are available through May.
- The DefendOps Diaries: SK Telecom's cyberattack exposes telecom vulnerabilities, affecting 23M subscribers and prompting industry-wide security reevaluations.
- www.bleepingcomputer.com: South Korean mobile provider SK Telecom has announced free SIM card replacements to its 25 million mobile customers following a recent USIM data breach, but only 6 million cards are available through May.
- www.cysecurity.news: SK Telecom, South Korea’s top mobile carrier, has disclosed a security incident involving a malware infection that exposed sensitive information tied to users’ Universal Subscriber Identity Modules (USIMs).
- bsky.app: South Korean mobile provider SK Telecom has announced free SIM card replacements to its 25 million mobile customers following a recent USIM data breach, but only 6 million cards are available through May
- PrivacyDigest: Free replacements for 25 million customers mobile provider SK Telecom has announced free SIM card replacements to its 25 million mobile customers following a recent data breach
- bsky.app: South Korean mobile provider SK Telecom has announced free SIM card replacements to its 25 million mobile customers following a recent USIM data breach, but only 6 million cards are available through May.
Classification:
- HashTags: #Cyberattack #DataBreach #SKTelecom
- Company: SK Telecom
- Target: SK Telecom subscribers
- Product: USIM
- Feature: USIM data breach
- Type: DataBreach
- Severity: Major