South Korea arrests 23 in $11 million Tether laundering scheme tied to Cambodia

South Korean police have arrested 23 people accused of laundering roughly $11.1 million for a Cambodia-based phishing organization, moving the funds through Tether (USDT) purchases and dozens of domestic and overseas cryptocurrency exchanges between February 2024 and April 2025.

According to local media outlet Newsis, police have detained two alleged ringleaders while referring all 23 suspects to prosecutors on charges that include violations of South Korea’s Foreign Exchange Transactions Act and the Act on Reporting and Use of Specific Financial Transaction Information.

How investigators unraveled the USDT laundering case

Authorities said the suspects worked on behalf of a criminal organization operating from Cambodia, where scam compounds have become a growing concern for governments across Asia.

Police allege the group converted proceeds from voice phishing schemes, romance scams and fraudulent investment operations into USDT before routing the funds across multiple exchanges.

The operation relied heavily on “mule” accounts. Investigators identified approximately 11,300 accounts allegedly used to process illicit transactions linked to 265 separate fraud incidents involving roughly $17 million in stolen funds.

Officials said the complexity of the network allowed the suspects to obscure transaction trails by moving assets rapidly between wallets and exchanges in different jurisdictions.

South Korean police have already seized around 650 million won, equivalent to approximately $430,000, in criminal proceeds and are seeking to recover additional assets connected to the scheme. The alleged mastermind remains at large and is now the subject of an Interpol Red Notice.

Stablecoins face renewed scrutiny as crypto crime evolves

The arrests come as regulators worldwide increase their focus on the misuse of stablecoins in cross-border financial crime.

USDT, the dollar-pegged stablecoin issued by Tether, has become a preferred settlement tool for illicit actors because of its high liquidity, global accessibility and ability to move value quickly across borders.

Blockchain analytics firms have repeatedly warned that criminal organizations are increasingly integrating digital assets into their laundering operations, particularly in Southeast Asia, where scam compounds have expanded rapidly since the COVID-19 pandemic.

However, experts stress that blockchain transactions also create permanent records that can aid law enforcement.

“Cryptocurrency transactions are traceable, and international cooperation remains the key to disrupting these networks,” said Tom Robinson in previous comments on crypto-enabled financial crime trends.

The latest enforcement action underscores how authorities are adapting to increasingly sophisticated laundering techniques as cybercriminals blend traditional fraud methods with digital assets.

For South Korean investigators, the USDT laundering case demonstrates the growing intersection between organized cybercrime and crypto infrastructure.

International hunt intensifies in USDT laundering case

The investigation did not stop with the initial arrests.

Police said they also detained 33 additional individuals accused of operating unauthorized currency exchange services using USDT for tourists and acquaintances.

Authorities warned that facilitating cryptocurrency transactions on behalf of third parties without proper licensing could expose individuals to serious criminal liability.

South Korea has intensified cooperation with regional partners to tackle scam compounds in Cambodia and other Southeast Asian countries, where thousands of foreign nationals have reportedly been recruited or trafficked into online fraud operations. Earlier this year, Seoul repatriated dozens of suspects allegedly linked to Cambodia-based scam networks as part of broader cross-border enforcement efforts.

Law enforcement officials say dismantling financial networks is essential to disrupting online fraud syndicates.

“The police will continue tracking overseas fugitives and confiscating criminal proceeds to eliminate the economic incentives behind these crimes,” the Seoul Metropolitan Police Agency said, according to local reports.

As investigators pursue the fugitive ringleader and trace additional assets, the USDT laundering case is expected to become a benchmark for future crypto crime enforcement actions in South Korea and across the region.