A wave of cyberattacks targets South Korean financial institutions, including Daishin Securities, Mirae Asset Global Investments, and Bithumb.
Daishin confirmed the exposure of customer data for 38,490 users, while investigations continue into broader regional trends connected to recent financial sector incidents.
Daishin said the data exposed included names, email addresses and mobile phone numbers. The company has notified affected customers and is cooperating with authorities in the investigation. It also said it will compensate for any damages, as required by law.
Mirae Asset Global Investments and Bithumb reported their incidents on Wednesday, October 28, 2026. The new incidents came about a month after a previous wave of attacks on financial institutions in the country. Authorities are still investigating what triggered the latest attacks.
Researchers have linked the September wave to a suspected hacker reportedly based in China. According to the researchers, he used Artex, an artificial intelligence tool for security testing.
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South Korea's financial regulator has called for stronger protections after a series of attacks on financial firms and government agencies. The country is also planning audits of dozens of private sector IT systems.
On October 27, 2026, Japanese company GMO Internet reported a cybersecurity incident following a series of attacks on financial institutions in Japan. Investigators have not found a connection between the incidents in Japan and South Korea.
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