The Lazarus Group, infamous for high-profile cyberattacks, gained notoriety for hacking Sony Pictures in retaliation for the 2009 film The Interview, which mocked North Korean leader Kim Jong Un. Their recent activities, however, focus on cryptocurrency theft, leveraging advanced social engineering techniques and malicious code.
Social Engineering and the Ginco Incident
In late March 2024, a TraderTraitor operative posing as a recruiter contacted an employee of Ginco, a Japanese cryptocurrency wallet software company, via LinkedIn. Disguised as part of a pre-employment process, the operative sent a malicious Python script under the guise of a coding test. The employee unknowingly uploaded the script to their GitHub account, granting the attackers access to session cookie information and Ginco’s wallet management system.
The attackers intercepted legitimate transaction requests from DMM employees by maintaining this access. This led to the theft of over 4,500 bitcoins, valued at $308 million. The funds were traced to accounts managed by the TraderTraitor group, which utilized mixing and bridging services to obfuscate the stolen assets.
North Korea's Financial Strategy and Cryptocurrency Exploitation
With international sanctions severely restricting North Korea's access to global financial systems, the regime increasingly relies on cybercrime and cryptocurrency theft for revenue generation. Due to their decentralized and pseudonymous nature, cryptocurrency presents a lucrative target for laundering stolen funds and bypassing traditional banking systems.
Chainalysis Findings
Blockchain intelligence firm Chainalysis attributed the DMM Bitcoin hack to North Korean actors. The attackers exploited weaknesses in the platform's infrastructure to perform unauthorized withdrawals. The stolen cryptocurrency was routed through multiple intermediary addresses and processed via the Bitcoin CoinJoin mixing service to conceal its origins. Portions of the funds were further transferred through various bridge services before being channelled to HuiOne Guarantee, a website linked to the Cambodian conglomerate HuiOne Group, a known facilitator of cybercrime.
Additional Findings by AhnLab Security Intelligence Center
The AhnLab Security Intelligence Center (ASEC) has reported another North Korean threat actor, Andariel — part of the Lazarus Group — deploying a backdoor known as SmallTiger. This tool has been used in campaigns parallel to those executed by TraderTraitor, highlighting the group's continued evolution in cybercrime tactics.
The coordinated alert from international agencies underscores the urgent need for enhanced cybersecurity measures within the cryptocurrency industry to counter sophisticated threats like those posed by the Lazarus Group and its affiliates.
The cryptocurrency industry has witnessed tremendous growth, Ether and Bitcoin are game changers. The rise has led to financial instruments like ETFs (Exchange-traded funds) that allow investors access without owning them directly. But, with the increase of crypto technologies, security questions have also surfaced.
The United States FBI recently warned about a major cybersecurity threat from North Korean hackers targeting cryptocurrency and web3 sectors. Billions of dollars go into these crypto ETFs, but investors shouldn’t be hasty to think their assets are secure.
Lazarus (a North Korean state-sponsored group) is no stranger to the cryptocurrency market and is allegedly responsible for various attacks against famous exchanges and blockchain protocols. Officials are concerned about hackers attacking crypto-backed ETFs by targeting the underlying assets.
North Korean hackers are using advanced engineering methods to fool employees at decentralized finance (DeFi) and cryptocurrency firms. The hackers impersonate high-profile figures within an organization and or make specific scenarios based on the target’s position, business interests, or skills to get in their good books.
“The actors may also impersonate recruiting firms or technology companies backed by professional websites designed to make the fake entities appear legitimate. Examples of fake North Korean websites can be found in affidavits to seize 17 North Korean domains, as announced by the Department of Justice in October 2023,” the FBI warned.
The FBI has warned against storing private cryptocurrency wallet data on web-connected devices as they may be victims of hacking attacks. If these requests come from unfamiliar sources, organizations should be careful when using non-standard software or applications on their network.
North Korean hackers have already stolen sensitive data from Bitcoin companies by using fake job ads. The FBI’s warning is a wake-up call for web3 and cryptocurrency firms to advance their cybersecurity systems and be careful against these rising attacks.
“The actors usually attempt to initiate prolonged conversations with prospective victims to build rapport and deliver malware in situations that may appear natural and non-alerting. If successful in establishing bidirectional contact, the initial actor, or another member of the actor’s team, may spend considerable time engaging with the victim to increase the sense of legitimacy and engender familiarity and trust,” the FBI reports.
According to a study conducted by Elastic Security Labs, the malware, dubbed as ‘KandyKorn’ is a sophisticated backdoor that could be used to steal data, directory listing, file upload/download, secure deletion, process termination, and command execution.
At first, the attackers used Discord channels to propagate Python-based modules by pretending to be active members of the community.
Apparently, the social engineering attacks pose as an arbitrage bot intended to generate automatic profits by coercing its members into downloading a malicious ZIP archive called “Cross=platform Bridges.zip.” However, there are 13 malicious modules that are being imported by the file to work together in order to steal and alter the stolen information.
The report reads, “We observed the threat actor adopting a technique we have not previously seen them use to achieve persistence on macOS, known as execution flow hijacking.”
Users of Unibot were notified by blockchain analytics company Scopescan about an ongoing hack, which was subsequently verified by an official source:
“We experienced a token approval exploit from our new router and have paused our router to contain the issue.” Later, Unibot guaranteed that it would compensate all the victims who lost their funds in the exploit.
Lazarus Group/ Lazarus is a North Korean state-sponsored cyber threat group, linked to the Reconnaissance General Bureau that operates out of North Korea. As part of a campaign called Operation Blockbuster by Novetta, the group, which has been operating since at least 2009, is said to have been behind the devastating wiper attack against Sony Pictures Entertainment in November 2014. The malware that Lazarus Group uses is consistent with other known campaigns, such as DarkSeoul, Operation Flame, Operation 1Mission, Operation Troy, and Ten Days of Rain.
However, in certain definitions of the North Korean group, security researchers apparently report all North Korean state-sponsored cyber activities under the term Lazarus Group instead of tracking clusters or subgroups like Andariel, APT37, APT38, and Kimsuky.
The crypto industry remains a main target for Lazarus, with a primary motivation of profit rather than espionage, which is their second primary operational focus.
The fact that KandyKorn exists proves that macOS is well within Lazarus's target range and highlights the threat group's amazing ability to create subtle and sophisticated malware specifically designed for Apple devices.