Share this article

North Korea Suspected Again in Crypto Exchange Attacks

South Korea's spy agency beileves a recent run of hacking attacks on domestic cryptocurrency exchanges is linked to North Korea.

Updated Sep 13, 2021, 7:17 a.m. Published Dec 18, 2017, 2:00 p.m.
North Korea flag

South Korea's chief intelligence agency suspects that North Korean hackers are behind attacks on the country's most-trafficked bitcoin exchange.

According to a report this week by the BBC, the National Intelligence Service (NIS) has officially passed evidence of the allegations to prosecutors that would affirm attacks on a Bithumb employee's home computer dating back to February amount to a kind of espionage.

STORY CONTINUES BELOW
Don't miss another story.Subscribe to the Crypto Daybook Americas Newsletter today. See all newsletters

Around 7.6 billion won ($6.99 million) worth of cryptocurrencies was stolen at the time, along with the personal information of some 30,000 people. First reported in July, the data leak is believed to have led to the draining of funds from an unknown number of accounts.

The BBC report goes on to state that the hackers demanded a ransom of 6 billion won ($5.5 million) in exchange for the destruction of leaked information.

Still, while investigations are ongoing, it's far from an isolated incident. In October, officials from South Korea's National Police Agency confirmed 25 employees at four different exchanges were targeted in 10 separate "spear phishing" attempts this year.

The NIS also suspects North Korea was involved in an attack on another South Korean cryptocurrency exchange, Coinis, in September, and believes both incidents may be part of a coordinated effort to avoid sanctions.

North Korean flag image via Shutterstock

More For You

KuCoin Hits Record Market Share as 2025 Volumes Outpace Crypto Market

16:9 Image

KuCoin captured a record share of centralised exchange volume in 2025, with more than $1.25tn traded as its volumes grew faster than the wider crypto market.

What to know:

  • KuCoin recorded over $1.25 trillion in total trading volume in 2025, equivalent to an average of roughly $114 billion per month, marking its strongest year on record.
  • This performance translated into an all-time high share of centralised exchange volume, as KuCoin’s activity expanded faster than aggregate CEX volumes, which slowed during periods of lower market volatility.
  • Spot and derivatives volumes were evenly split, each exceeding $500 billion for the year, signalling broad-based usage rather than reliance on a single product line.
  • Altcoins accounted for the majority of trading activity, reinforcing KuCoin’s role as a primary liquidity venue beyond BTC and ETH at a time when majors saw more muted turnover.
  • Even as overall crypto volumes softened mid-year, KuCoin maintained elevated baseline activity, indicating structurally higher user engagement rather than short-lived volume spikes.

More For You

Bitcoin hash rate slides during U.S. winter storm while markets shrug off mining disruption

(Zac Durant/Unsplash)

The temporary loss of mining power underscores academic concerns that geographic and pool concentration can magnify infrastructure failures, though markets showed little immediate reaction.

What to know:

  • Bitcoin’s hashrate fell about 10 percent during a U.S. winter storm, underscoring how local power disruptions can strain the network’s capacity to process transactions.
  • Researchers have shown that concentrated mining, as seen in a 2021 regional outage in China, can lead to slower block times, higher fees and broader market disruptions.
  • With a few large pools now controlling most of Bitcoin’s hashrate, the network is increasingly vulnerable to localized infrastructure failures, even as the price of BTC remains largely unaffected in the short term.