The US, Japan, Germany and Australia have published a joint report detailing the scope of North Korea’s WaterPlum campaign.

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It’s unclear if the attacks are part of previous campaigns against Rust, but the techniques used by the attackers match those used by North Korea.

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North Korean hackers are infiltrating tens of thousands of job seekers’ computer networks by posing as prospective employers, such as artificial intelligence firms, to steal sensitive information and millions of dollars worth of cryptocurrency, U.S. and allied governments warned Friday.

The security agencies behind the alert, attributed the group, known as WaterPlum or Contagious Interview, as operating under the 313 General Bureau of the Munitions Industry Department subordinate to the Central Committee of the Workers Party of Korea. The efforts dovetail with those of North Korean IT workers.

“WaterPlum actors pose as prospective employers to target software developers and IT professionals worldwide under the pretext of attractive job opportunities,” the agencies wrote. “They often impersonate legitimate Artificial Intelligence (AI), cryptocurrency, or Non-Fungible Token (NFT) companies and have also used recruiting services.”

Additionally, “Some WaterPlum actors also operate as North Korean IT workers performing web system design and development tasks on corporate web systems for clients,” read the alert from agencies in Japan, Australia and Germany, alongside the FBI and the Department of Defense’s Cyber Crime Center.

They’ve used the stolen information to fuel other operations, and the overlap between WaterPlum and North Korean IT workers is substantial, the agencies said.

“WaterPlum actors and North Korean IT Workers used the same IP addresses when accessing laptop farms, using cloud-sourcing services, and applying for positions at the Japanese cryptocurrency exchange,” they wrote.

Collectively, WaterPlum has infected more than 30,000 devices in more than 100 countries, targeting IT professionals in Japan, the United States, Europe and other nations. Its operations have transferred the equivalent of nearly $11 million of cryptocurrency from over 7,000 crypto wallets to North Korea, according to the alert.

The law enforcement agencies said they have had some success tackling the group, but are seeking further cooperation and released details in the alert about WaterPlum’s tactics, techniques and procedures.

“For the first time in Japan, authorities successfully identified, investigated, and dismantled a ‘laptop farm’ operated by an enabler in Japan,” the alert reads. “Japanese authorities obtained evidence this cyber actor group transferred several hundred million Japanese yen in cryptocurrency to foreign locations outside of Japan. The FBI continues to identify and prosecute US-based actors providing illicit facilitation services to North Korean IT workers.”

The warning comes as the Multilateral Sanctions Monitoring Team, an international panel overseeing UN sanctions against North Korea, released a report exposing thousands of North Korean nationals employed in industries around the world.

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The stealthy toolkit embeds a backdoor in HAProxy and targets automotive and media organizations in South Korea for long-term surveillance.

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Hackers pushed a poisoned arrayref version that added a dependency to fetch a malicious payload from a remote server.

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U.S. and South Korean cyber agencies warned Monday about a ransomware-as-a-service outfit, Gunra, that reportedly recruits ethical hackers and penetration testers and benefits from North Korean government-linked hackers’ tools to target government and critical infrastructure organizations.

Gunra has gone after sectors such as academia, financial services and insurance, government services and facilities, healthcare, manufacturing and construction, media, retail, transportation and utilities. Its global scope is far-ranging, according to Monday’s alert: Africa, the Americas, the Asia-Pacific, Europe and the Middle East.

“Gunra is another variant in the ongoing trend of ransomware attacks causing disruption and harm to U.S. and international organizations,” said Chris Butera, acting assistant director for cybersecurity at the Cybersecurity and Infrastructure Security Agency, which produced the advisory with the Department of Defense’s Cyber Crime Center, FBI, National Security Agency, Secret Service and Republic of Korea’s National Police Agency.

The alert is part of the #StopRansomware series, a joint FBI-CISA project aimed at network defenders.

The FBI first took notice of Gunra in April of last year. The double-extortion group established a data leak site on Tor to list victims and publish purloined data. By January of this year, Gunra had launched a formal ransomware-as-a-service affiliate and was growing in its ambition, Monday’s alert states.

“The FBI observed the group adopting new branding aliases (notably operating under the name Golden Community) to support this expansion,” it reads. “Gunra has further commercialized its platform by actively recruiting penetration testers and ethical hackers to serve as initial access brokers, offering a share of the ransom profits in exchange for enterprise network access.”

Gunra seeks initial access with known vulnerabilities in internet-facing devices like firewalls or virtual private networks, and is based on or influenced by the Conti ransomware code leaked in 2022, according to the agencies.

Research published in July by a South Korean cybersecurity firm took note of Gunra overlap with Lazarus Group, although it doesn’t explicitly mention the latter group’s name.

“These commonalities suggest that although the state-sponsored threat group and the Gunra ransomware group appear to be separate threat actors with different ultimate objectives, they may have shared certain techniques, tools, and infrastructure or collaborated to a limited extent during the attacks,” AhnLab wrote in its report.

That kind of North Korean government-ransomware gang collaboration dates back to at least 2024. Nor is Gunra alone among ransomware-as-a-service outfits recruiting penetration testers.

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Amazon’s security researchers say a hacking group tied to North Korea targeted small, little-noticed software packages more than a year before it struck one of the internet’s most widely used programming tools.

The company’s threat intelligence team said Wednesday at a media roundtable at its Arlington, Va., offices that the same group linked to the recent compromise of the open-source axios software library also planted malicious code in a package called typo-crypto in March 2025, a full year before the axios breach. Researchers found the connection while tracing domain records tied to the axios attack back to earlier activity.

“We believe the March 2025 typo-crypto campaign was a rehearsal,” said CJ Moses, Amazon’s chief information security officer, adding that the target’s small scale let the group test its methods “without putting that on the big stage.”

Amazon said the group also compromised two other packages, debug and chalk, in September 2025. Until now, those three incidents had not been publicly linked to the same actor. Security researchers track the group under several names, including UNC1069, Sapphire Sleet and Stardust Chollima. 

Axios, debug and chalk are code libraries used by software developers around the world to build applications. Axios alone is downloaded more than 100 million times a week. “That number represents real organizations putting real code into production systems every single week,” Moses said.

In the typo-crypto case, the malicious file was named “core.js” and was made to look like a legitimate, unrelated package called core-js. Amazon said the file activated only when it received a specific numeric input, then reached out to a server controlled by the attackers to download a second piece of code. That second stage was written differently depending on whether the infected computer ran Windows, macOS or Linux. The code combined encoded text with a cipher, a method Moses said was meant to slow down analysis, including by AI-based review tools, without relying on heavy encryption.

Amazon said the typo-crypto package had few downloads compared with axios, debug or chalk. Researchers believe that initial target served as practice, letting the group refine its approach before turning to more widely used software. “They did what a lot of people do: crawl, walk, run,” Moses said. 

In each of the four cases, Amazon said, the attackers built a relationship with a maintainer who already had access to a package, then used that access to publish an update containing hidden code. “They didn’t break through a window,” Moses said. “They basically earned the trust of an employee to hand them the keys.”

Cybersecurity firm Wiz separately found that about 1 in 10 cloud computing environments were affected by the debug and chalk incident within a two-hour span, a finding Moses cited to illustrate how fast the impact spread. “Going from there not being a vulnerability, to there being a vulnerability, to there being an exploited vulnerability … used to be days to weeks. Now it’s hours to minutes,” he said.

Rick Anthony, senior engineering manager at Amazon Web Services, said the research further shows how attackers face two basic problems in these types of incidents: getting malicious code into a package that will eventually run inside an organization, and keeping that code hidden from developers or security tools. He said groups are increasingly building reputations as legitimate contributors over time. 

“Let me get my package deployed in as many places as possible so that I can spring the trap later,” said Anthony, describing the mindset behind the approach.

Researchers said generative AI has made it easier for attackers to produce code, documentation and contribution histories that look authentic. Anthony also described a technique in which attackers register package names that AI coding tools sometimes generate by mistake, so a developer following an AI suggestion could install malicious software without making any typing error of their own.

The findings come two years after a separate incident involving a program called xz-utils, in which an attacker spent time gaining the trust of the software’s maintainers before inserting a backdoor. Moses pointed to that case as an early example of a pattern now appearing “at scale” and tied to a nation-state.

Since that incident, separate groups have been running roughshod over open-source software. Another group known as TeamPCP has compromised and injected malicious code into more than 1,000 software packages over a four-month span this year. 

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The people orchestrating North Korea’s IT worker scheme are funneling money through a web of front companies and intermediaries, including sanctioned entities, that partly fund Russia’s war effort against Ukraine, DTEX said in a report Tuesday.

The security firm’s research shows that the scheme is moving beyond funding the country’s weapons program and into a bigger pool that supports many of the regime’s objectives. This includes manufacturing weapons and supplying them to Russia’s military, according to DTEX.

“When we think IT workers, we typically think head down, get your money, support the weapons program,” Michael Barnhart, nation state investigator at DTEX and lead author of the report, told CyberScoop.

“It’s a broad cover-all statement when we say it’s supplying the weapons program,” he said. “That’s the predominant place it goes,” but many other domestic programs and entities tasked with other projects are taking cuts from that pool of money as well. 

Barnhart corroborated previously leaked data from an internal North Korean payment server, which included 390 IT worker accounts, chat logs and transaction data.

He mapped the transactions to organizations that received those funds, including multiple sanctioned entities: Sobaeksu, Saenal, and Songkwang. 

The money trail also showed $1.97 million in payments from North Korean IT workers between December 2025 and February 2026 flowing directly through Korea Ryonbong General Corp, a sanctioned defense entity that procures weapons for the regime’s military programs.

Western officials previously reported that North Korea provided ammunition and weapons to Russia in 2023, and in the fall of 2024 sent upwards of 15,000 soldiers to fight alongside Russian troops, according to the Council on Foreign Relations.

“This is a consequence that is often overlooked,” Barnhart wrote in the report. “Revenue from the IT worker stream does not stop at a resume scam or a payroll-abuse story. It can feed a larger DPRK system that supports sanctioned entities, domestic state needs, and a Russia war effort that is actively consuming all facets of North Korean weapons and military support.” 

Data from the internal North Korean payment server, which was first published by ZachXBT in April, is controlled by “PC-1234,” a single administrator that DTEX has been tracking for a while. The wallet and its cluster of activity remains active, Barnhart said. 

The three months of previous activity attributed to the wallet amounted to more than $2.84 million, which then flowed upward into dozens of organizations. 

“It’s not a top-down funded regime. It’s a bottom-up,” Barnhart said. “Everyone makes money at the bottom and then they take a tiny cut, and then the money goes upwards to what we just blanketly say is the weapons program. But really, it can go a lot more places.”

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