North Korean state actors have been using fake or stolen identities to secure IT jobs in various companies, particularly in the blockchain and technology sectors. These actors have stolen virtual currency and funneled money to North Korea's weapons program. The practice has escalated with the rise of remote work and AI, enabling fraudsters to impersonate employees and gain privileged access to company networks.
Labyrinth Chollima, a prolific North Korean-linked cyber threat group, has recently evolved into three distinct hacking groups: Labyrinth Chollima, Golden Chollima, and Pressure Chollima. Labyrinth Chollima continues to focus on cyber espionage, targeting industrial, logistics, and defense companies, while Golden Chollima and Pressure Chollima have shifted towards targeting cryptocurrency entities. Each group uses distinct toolsets in their malware campaigns, all evolutions of the same malware framework used by Labyrinth Chollima in the 2000s and 2010s.
A joint investigation led by Mauro Eldritch, founder of BCA LTD, conducted together with threat-intel initiative NorthScan and ANY.RUN, uncovered a network of remote IT workers tied to Lazarus Group's Famous Chollima division. Researchers captured live activity of Lazarus operators on what they believed were real developer laptops, which were actually fully controlled, long-running sandbox environments created by ANY.RUN.
Thousands of North Korean IT workers have infiltrated the job market over the past two years, exploiting vulnerabilities in hiring processes and remote work environments. Over 320 cases of North Korean operatives infiltrating companies by posing as remote IT workers were identified in August 2025. The Justice Department has shut down several laptop farms used by these actors, but the problem persists, with security experts warning of significant security risks and financial losses for affected companies.
The U.S. Treasury's Office of Foreign Assets Control (OFAC) has recently sanctioned two individuals and two entities for their role in these schemes, identifying financial transfers worth nearly $600,000 and over $1 million in profits generated since 2021.
Japan, South Korea, and the United States are collaborating to combat North Korean IT worker schemes. The three countries held a joint forum on August 26, 2025, in Tokyo to improve collaboration, with both Japan and South Korea issuing updated advisories on the threat. The United States sanctioned four entities for their roles in the IT worker fraud schemes, accusing them of working to help the Democratic People's Republic of Korea (DPRK) to generate revenue.
Recently, five U.S. citizens pleaded guilty to assisting North Korea's illicit revenue generation schemes by enabling IT worker fraud. The scheme impacted more than 136 U.S. victim companies, generated more than $2.2 million in revenue for the DPRK regime, and compromised the identities of more than 18 U.S. persons. The US government has seized $15m worth of gains in Tether (USDT) from APT38 actors, seeking to return the funds to their rightful owners.
North Korean IT recruiters target and lure developers into renting their identities for illicit fundraising. Famous Chollima, part of North Korea’s state-sponsored Lazarus group, uses deep fake videos and avoids appearing on camera during interviews. Legitimate engineers are recruited to act as figureheads in DPRK agents’ operations to secure remote jobs at targeted companies. Compromised engineers receive a percentage of the salary, between 20% and 35%, for the duration of the contract. DPRK agents use compromised engineers' computers as proxies for malicious activities to hide their location and traces. North Korean recruiters use AI-powered tools like AIApply, Simplify Copilot, Final Round AI, and Saved Prompts to autofill job applications and create resumes. The threat actor used Astrill VPN, a popular service among North Korean fake IT workers, for remote connections. The Famous Chollima team involved in this operation consisted of six members, who used the names Mateo, Julián, Aaron, Jesús, Sebastián, and Alfredo.
The DPRK IT worker scheme is also tracked as Jasper Sleet, PurpleDelta, and Wagemole. The scheme aims to generate revenue, conduct espionage, and in some cases, demand ransoms. DPRK IT workers transfer cryptocurrency through various money laundering techniques, including chain-hopping and token swapping. Norwegian businesses have been impacted by IT worker schemes, with salaries likely funding North Korea's weapons and nuclear programs. A campaign dubbed Contagious Interview uses fake hiring flows to lure targets into executing malicious code. The campaign employs EtherHiding, a technique using blockchain smart contracts to host and retrieve command-and-control infrastructure. New variants of the Contagious Interview campaign use malicious Microsoft VS Code task files to execute JavaScript malware. The Koalemos RAT campaign involves malicious npm packages to deploy a modular JavaScript remote access trojan (RAT) framework.