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The Battle for Crypto Security: South Korea’s Ongoing Struggle Against North Korean Cyberattacks on Upbit and Beyond

By: crypto insight|2025/11/27 09:30:04

Key Takeaways

  • North Korean hackers have repeatedly targeted South Korean cryptocurrency exchanges, with Upbit suffering significant thefts.
  • The attacks are part of a broader geopolitical struggle, where North Korea uses stolen crypto to fund its missile programs.
  • South Korean exchanges face significant challenges in securing digital assets against state-sponsored hacking groups like Lazarus Group.
  • Despite increased regulation, the persistent threat from cyber adversaries necessitates ongoing vigilance and innovation in security measures.

WEEX Crypto News, 2025-11-27 09:13:21

Introduction

In recent years, the South Korean cryptocurrency market has emerged as one of the key arenas for geopolitical cyber warfare, primarily involving North Korean hackers. Known for its high retail investor activity and liquidity premiums, aptly termed “kimchi premium,” South Korea’s crypto industry has become both a lucrative target and a vulnerable hotspot for state-backed cyber adversaries. This article delves into the historical and ongoing cyberattacks, primarily focusing on the largest exchange, Upbit, which has been victimized multiple times by what is believed to be North Korean hacking efforts.

A Brief Chronicle of Breaches

The journey of exchanges in South Korea, particularly Upbit, resembles a cycle of attacks and adaptations. The most recent incident, on November 27, 2025, marked another chapter in this saga. Upbit reported a significant breach where attackers exploited their Solana hot wallet, resulting in a loss of approximately 540 billion Korean won, equivalent to 36.8 million USD. This wasn’t an isolated incident but part of a broader pattern of sophisticated cyber intrusions, leading to cumulative losses well over 2 billion USD at historical prices.

The 2017 Inception

The year 2017 marked the beginning of a relentless series of cyber thefts. Bithumb, a major South Korean exchange, was among the first major targets. Hackers infiltrated employee computers, extracting personal data from approximately 31,000 users. Such information was used to conduct phishing attacks, resulting in losses of around 32 million USD. The failures highlighted inadequate security measures and a lack of basic cyber hygiene, which paved the way for subsequent targeted attacks.

The Mid-2018 Wallet Raids

Fast forward to 2018, Korean exchanges continued to be cybercrime magnets. Coinrail experienced a breach resulting in a 40 million USD loss, with hackers targeting the then-popular ICO tokens instead of the more stable cryptocurrencies like Bitcoin or Ethereum. This incident was a testament to diversifying hacking strategies, moving beyond traditional assets to exploit market dynamics. Contrast this with Bithumb’s loss of about 31 million USD in XRP tokens the same month, which shook market confidence and led to broader regulatory scrutiny.

The 2019 Upbit Heist

A defining moment was the 2019 Upbit hack, considered the largest single heist of that time within South Korea. Around 342,000 ETH was stolen in a strategic maneuver as criminals took advantage of the exchange’s internal wallet reorganization. Investigations revealed intricate laundering techniques involving peel chains, skillfully dispersing the stolen ether across numerous transactions and nations, complicating recovery efforts.

Continuous Threats and Losses

The attacks on medium-sized exchanges like GDAC in 2023, which saw a 13 million USD theft, further underscored the persistent threats facing the industry. For Upbit, history repeated on the exact date in 2025, with losses echoing their past trauma. This pattern of breaches has driven home the fact that compliance and security frameworks like the Financial Information Act, implemented post-2019, while necessary, are insufficient given the evolving tactics of state-backed hackers.

The Primacy of Lazarus Group

At the center of many of these attacks is Lazarus Group, a notorious hacking faction linked to North Korea’s Reconnaissance General Bureau. Lazarus first gained notoriety through high-profile attacks outside the crypto domain, such as the Sony Pictures hack in 2014 and the Bangladesh Bank heist in 2016. Since pivoting to cryptocurrencies, their operations have exploited the lower regulatory oversight and varying security standards of exchanges like Upbit.

Why South Korea?

Several factors make South Korea an irresistible target for such attacks:

  • Geopolitical Tension: Attacks on South Korean exchanges serve a dual purpose for North Korea—raising funds and creating instability in an enemy state.
  • Kimchi Premium: This phenomenon, driven by local crypto enthusiasm, leads to significant liquidity pools in hot wallets, presenting a tempting target rich environment for hackers.
  • Cultural and Linguistic Advantage: Sharing linguistic and cultural ties, North Korean operatives can more effectively conduct social engineering attacks, increasing their chances of success.

Crypto’s Dark Funding Channel

The ramifications of these cyber heists extend beyond financial loss. According to international reports, including those from the United Nations, stolen cryptocurrencies have been integral in funding North Korea’s missile developments. Estimates suggest that nearly 50% of the funding for these programs comes from these illicit cyber operations, a stark increase from prior estimates of a third.

Laundering the Loot

Post-theft, the laundering processes are meticulous and protracted. Techniques such as peel chains and mixers like Tornado Cash aid in obfuscating the source of funds. Alleged North Korean-operated exchanges then transform the assets, selling them at a discount to convert them into less traceable currencies, often moving through underground networks in China and Russia.

A Global Issue

While the spotlight has been on Korea due to repeated incidents, this is a mere subset of a global problem. State-sponsored cyberattacks on crypto platforms aren’t limited to North Korea. Entities linked to Russia have been accused of similar deeds, and Iranian groups have targeted Israeli crypto firms. Cases such as the 2025 Bybit breach underscore the expansive reach of these threats.

Systemic Vulnerabilities

Centralized nodes, such as exchanges and cross-chain bridges, underscore the systemic vulnerabilities within the crypto ecosystem. While blockchains themselves may be secure, assets must invariably transit centralized gateways, which are prone to sophisticated cyberattacks.

Conclusion

The narrative of South Korean exchanges like Upbit reflects the intricate dance between burgeoning crypto markets and determined state-backed adversaries. The story is one of cat-and-mouse, where exchanges strive to shore up defenses against hackers who only need to succeed once. The battle is symbolic of broader challenges facing the digital asset realm, where innovation must constantly pace itself against sophisticated threats.

Enhancing Defense Strategies

For crypto exchanges worldwide, this ongoing struggle necessitates adopting advanced security measures. This includes leveraging multi-signature wallet structures, improving employee training to mitigate phishing risks, and fostering cross-border collaborations for more robust threat intelligence sharing.

FAQ

What is the “kimchi premium”?

The “kimchi premium” refers to the price difference for cryptocurrencies between South Korean and global exchanges. It often arises due to higher local demand and obstacles in accessing international markets, creating liquidity pools that attract hackers.

Who is the Lazarus Group?

Lazarus Group is a state-sponsored hacking organization linked to North Korea’s Reconnaissance General Bureau. They are known for their cyber heists, which target both traditional finance and cryptocurrencies to fund national projects.

How do crypto exchanges attempt to prevent hacks?

Exchanges employ multiple layers of security such as cold wallets for the majority of funds, two-factor authentication for user accounts, regular security audits, and advanced encryption protocols to safeguard against unauthorized access.

How does North Korea use stolen crypto funds?

Stolen cryptocurrencies funnel into North Korea’s high-priority projects, including missile and nuclear programs, as they offer a semi-anonymous source of funding that bypasses international sanctions and banking oversight.

What can individual crypto investors do to protect themselves?

Individuals should use secure wallets, enable two-factor authentication, avoid storing large amounts on exchanges, carefully manage their passwords, and stay informed about potential phishing threats to protect their crypto assets.

By understanding and navigating these complex dynamics, stakeholders can contribute to a safer crypto ecosystem, notwithstanding the persistent and evolving threats.

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