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Data breach

SK Shieldus hack leaks 15.1GB of client security data

First reported · Last reported · 30 related reports

SK Shieldus was hacked in October 2025, leaking 15.1GB of client-related data. It was found that security monitoring system deployment materials and solution verification materials for 120 private companies and numerous public institutions were leaked through the personal email accounts of two employees that were connected to a honeypot while automatically logged in. The Personal Information Protection Commission (PIPC) launched an investigation, and SK Shieldus began a full review of 80,000 emails.

Key facts

Affected organization
SK Shieldus
Incident type
Data breach
Occurred / detected
Not confirmed
Scale of damage
15.1GB of data related to 120 private companies and numerous public institutions
Cause / method
Data leaked through the personal email accounts of two employees connected to a honeypot while automatically logged in
Location
South Korea

If your data was exposed

  1. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organization’s official website or app.
  2. If you’ve suffered harm, report it. Call 118 (no area code) for privacy violations, contact the police for financial losses, and apply for dispute mediation to seek compensation.Personal Information Infringement Report Center ↗Korean National Police Agency cybercrime report ↗Personal Information Dispute Mediation Committee ↗

Timeline

  1. Hacker group Black Shrantac claimed to have hacked SK Shieldus and obtained 24GB of internal data.
  2. It was reported that SK Shieldus, despite two hacking warnings, became aware of the incident only after the dark web leak and reported it late.
  3. The Personal Information Protection Commission (PIPC) launched an investigation into the SK Shieldus personal data leak.
  4. It was found that 15.1GB of data related to 120 private companies and numerous public institutions had been leaked through the personal email accounts of two employees, and SK Shieldus began a full review of 80,000 emails.

Also affected by this incident

30 related reports

The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organization’s official statements for accurate details.