Bithumb Users Face Phishing Risks After Reported Data Leak

Some customer personal data at South Korea’s second-largest crypto exchange, Bithumb, was reportedly leaked on October 28 after an external unauthorized party accessed one of its internal workplace tools. This is the latest in a string of similar incidents that have cut across crypto companies and traditional financial firms. According to the Yonhap News Agency, the exchange detected abnormal access by an outsider without authority on October 27, inside its in-house mobile groupware system. While the exchange is said to still be working out the exact scope of the breach, another firm, Daishin Securities, which was also hit, reported that information on more than 38,000 of its customers, including names, emails, and phone numbers, was leaked. Mirae Asset Global Investment was also a victim, and Korea’s Financial Supervisory Service (FSS) is said to be investigating all three incidents and has already sent an on-site team to Daishin. At a meeting with the chairmen of eight bank holding companies, FSS Director Lee Chan-jin pressed the financial sector on IT security, saying: “As artificial intelligence is used as a means of hacking, security vulnerabilities will be easily detected and simultaneous attacks will become a regular occurrence.” He added that boards must now take the lead in improving the security capabilities of their companies. Binance co-founder Changpeng Zhao (CZ) also reacted to the news, telling his 12.9 million followers on X that while they may not be able to prevent leaks, they could take measures to protect themselves, including reducing the information they share and locking down their accounts. Leaked exchange data, he pointed out, mostly feeds phishing and SIM-swapping attacks, and he recommended using a unique email alias for each exchange and hardware keys or passkeys instead of SMS codes. “Assume anyone who contacts you about your account, ‘security issues,’ or ‘refund recovery’ is a scammer, even if they know your name, balance, or recent trades,” CZ cautioned. The Bithumb case has come right in the middle of other security disclosures involving crypto businesses, with hardware wallet maker Foundation saying yesterday that its customers had been hit with more than 23,000 phishing emails sent from its official domain after hackers compromised its API keys on Cloudflare. Recall that in August, a Trezor provider named ShipMonk had the names, locations, and emails of more than 67,000 users stolen, while