South Korea’s largest cryptocurrency exchange, Upbit, is currently under scrutiny by regulators following a significant hack that led to the unauthorized withdrawal of approximately $36.9 million in assets on the Solana (SOL) network. The breach impacted over 20 different tokens and has prompted Upbit to freeze assets on its platform while an investigation unfolds.

Lazarus Group Tied To Upbit Hack

Authorities are now investigating the possibility of North Korean involvement in the cyber attack. Reports suggest that a group affiliated with North Korea’s intelligence agency, the notorious Lazarus Group, may have orchestrated the hack, which Upbit has described as an “abnormal withdrawal.” 

This group has been consistently linked to several high-profile crypto heists in recent years, and the US Federal Bureau of Investigation (FBI) has identified North Korean cyber operations as one of the most sophisticated and persistent threats.

The recent attack coincidentally occurred just days before the sixth anniversary of a previous major breach, in which Upbit lost 342,000 Ethereum (ETH) to North Korean hackers. 

According to an unnamed government official, this latest hack bears similarities to a 2019 incident in which approximately 58 billion won in cryptocurrencies was stolen, also attributed to the Lazarus Group.

In response to the attack, the South Korean National Police Agency has launched an investigation into the matter, although officials have not provided further comments on the case. Upbit’s operator, Dunamu, confirmed that an in-depth investigation into the cause and extent of the asset outflow is currently underway.

Crypto Exchange Moves Funds To Cold Storage

The cryptocurrency exchange’s CEO Oh Kyung-seok stated that as soon as abnormal withdrawal activity was detected, Upbit promptly suspended all deposit and withdrawal services. 

“We are conducting a comprehensive inspection, prioritizing the protection of member assets,” he said in a notice to users. Following the discovery of the unauthorized transactions, Upbit has taken steps to freeze the affected funds wherever possible.

To prevent any further unauthorized transfers, the exchange has shifted all remaining assets to cold storage, ensuring “a secure environment for funds.” 

Upbit is also said to be working with relevant project teams to freeze assets on-chain, having already blocked a portion of the stolen funds related to the cryptocurrency Solayer (LAYER). The exchange has indicated that deposits and withdrawals will only resume once full security checks are completed.

Dunamu has vowed to reimburse customers for any losses with business funds as part of its commitment to its users. It remains to be seen what additional information the country’s authorities will release in the coming days, as well as potential refund deadlines for affected individuals.  

Featured image from DALL-E, chart from TradingView.com 

Upbit, South Korea’s biggest cryptocurrency exchange, said it found unusual withdrawals from one of its Solana hot wallets and moved quickly to stop trades and protect customers.

According to company statements and law enforcement sources, about 44.5 billion Korean won — roughly $32 million — vanished in the incident that surfaced late November 2025. Upbit paused deposits and withdrawals and said it would repay affected users from its own reserves.

Suspected North Korean Ties

Based on reports from investigators and industry watchers, authorities are examining links to the Lazarus Group, a cyber unit long tied to North Korea.

Security teams point to methods similar to earlier attacks attributed to the same group, including a major breach in 2019 that took 342,000 ETH from the exchange.

Officials say the pattern of rapid withdrawals, quick cross-chain transfers, and spreading funds across many wallets matches tactics used in past nation-linked operations.

today south korea blamed north korea for the upbit hack nice headline but that part came later

so what actually happened?

an unknown attacker drained a few of upbit’s hot wallets waited a bit then started moving funds across chains

at some point the hacker bridged usdc from… pic.twitter.com/swq8yjIOLR

— trix (@trixwtb) November 28, 2025

How The Funds Were Moved

Reports have disclosed that the stolen tokens were moved off Solana, converted through several bridges, and routed through multiple chains to make tracking harder.

Transfers happened fast and in many small transactions, which complicates tracing attempts on the blockchain. Blockchain analysts are combing transaction histories, but the bridge conversions and mixing steps slow down any straightforward recovery efforts.

On-Site Checks And Ongoing Forensics

Authorities have launched inspections at Upbit’s systems and are reviewing logs, admin access records, and wallet backups.

According to sources close to the probe, investigators suspect an admin credential compromise or impersonation rather than a simple software flaw in Upbit’s servers.

While evidence is still being gathered, forensic teams are looking for the entry point used to sign the withdrawal transactions and any indicators of outside control.

Investigation And Market Impact

The timing of the theft drew attention because it coincided with corporate news: Upbit’s parent, Dunamu, had public talk of a merger with Naver valued at about $10.3 billion.

Market players noted the coincidence, and some suggested the attack could aim to distract or unsettle stakeholders. For investors, exchanges, and regulators, the incident renews calls for stricter custody controls, better separation of hot and cold wallets, and clearer rules for large crypto platforms.

Yonhap News reports that South Korea’s largest crypto exchange, Upbit, suffered a hack worth about 44.5 billion KRW ($32 million). Authorities are investigating whether North Korea’s Lazarus Group was behind the attack. The group was also linked to Upbit’s 2019 theft of 58…

— Wu Blockchain (@WuBlockchain) November 28, 2025

Upbit has pledged full reimbursement to users hit by the theft and says it will share findings when the probe allows. Based on reports, tracing and recovery work is ongoing but will be slow because of how the assets were fragmented and moved across chains.

Watchers say confirmation of Lazarus involvement would mark another example of how state-linked actors continue to target major crypto firms.

Authorities have not yet publicly released a definitive attribution. The next steps to watch include any formal statements from prosecutors, whether any of the moved funds are frozen or returned, and how regulators will respond to reduce the chance of similar losses.

Featured image from Advance Innovations, chart from TradingView