krebsonsecurity.com Brian Krebs September 16, 2025

At least 187 code packages made available through the JavaScript repository NPM have been infected with a self-replicating worm that steals credentials from developers and publishes those secrets on GitHub, experts warn. The malware, which briefly infected multiple code packages from the security vendor CrowdStrike, steals and publishes even more credentials every time an infected package is installed.

The novel malware strain is being dubbed Shai-Hulud — after the name for the giant sandworms in Frank Herbert’s Dune novel series — because it publishes any stolen credentials in a new public GitHub repository that includes the name “Shai-Hulud.”

“When a developer installs a compromised package, the malware will look for a npm token in the environment,” said Charlie Eriksen, a researcher for the Belgian security firm Aikido. “If it finds it, it will modify the 20 most popular packages that the npm token has access to, copying itself into the package, and publishing a new version.”

At the center of this developing maelstrom are code libraries available on NPM (short for “Node Package Manager”), which acts as a central hub for JavaScript development and provides the latest updates to widely-used JavaScript components.

The Shai-Hulud worm emerged just days after unknown attackers launched a broad phishing campaign that spoofed NPM and asked developers to “update” their multi-factor authentication login options. That attack led to malware being inserted into at least two-dozen NPM code packages, but the outbreak was quickly contained and was narrowly focused on siphoning cryptocurrency payments.

In late August, another compromise of an NPM developer resulted in malware being added to “nx,” an open-source code development toolkit with as many as six million weekly downloads. In the nx compromise, the attackers introduced code that scoured the user’s device for authentication tokens from programmer destinations like GitHub and NPM, as well as SSH and API keys. But instead of sending those stolen credentials to a central server controlled by the attackers, the malicious nx code created a new public repository in the victim’s GitHub account, and published the stolen data there for all the world to see and download.

Last month’s attack on nx did not self-propagate like a worm, but this Shai-Hulud malware does and bundles reconnaissance tools to assist in its spread. Namely, it uses the open-source tool TruffleHog to search for exposed credentials and access tokens on the developer’s machine. It then attempts to create new GitHub actions and publish any stolen secrets.

“Once the first person got compromised, there was no stopping it,” Aikido’s Eriksen told KrebsOnSecurity. He said the first NPM package compromised by this worm appears to have been altered on Sept. 14, around 17:58 UTC.

The security-focused code development platform socket.dev reports the Shai-Halud attack briefly compromised at least 25 NPM code packages managed by CrowdStrike. Socket.dev said the affected packages were quickly removed by the NPM registry.

In a written statement shared with KrebsOnSecurity, CrowdStrike said that after detecting several malicious packages in the public NPM registry, the company swiftly removed them and rotated its keys in public registries.

“These packages are not used in the Falcon sensor, the platform is not impacted and customers remain protected,” the statement reads, referring to the company’s widely-used endpoint threat detection service. “We are working with NPM and conducting a thorough investigation.”

A writeup on the attack from StepSecurity found that for cloud-specific operations, the malware enumerates AWS, Azure and Google Cloud Platform secrets. It also found the entire attack design assumes the victim is working in a Linux or macOS environment, and that it deliberately skips Windows systems.

StepSecurity said Shai-Hulud spreads by using stolen NPM authentication tokens, adding its code to the top 20 packages in the victim’s account.

“This creates a cascading effect where an infected package leads to compromised maintainer credentials, which in turn infects all other packages maintained by that user,” StepSecurity’s Ashish Kurmi wrote.

Eriksen said Shai-Hulud is still propagating, although its spread seems to have waned in recent hours.

“I still see package versions popping up once in a while, but no new packages have been compromised in the last ~6 hours,” Eriksen said. “But that could change now as the east coast starts working. I would think of this attack as a ‘living’ thing almost, like a virus. Because it can lay dormant for a while, and if just one person is suddenly infected by accident, they could restart the spread. Especially if there’s a super-spreader attack.”

For now, it appears that the web address the attackers were using to exfiltrate collected data was disabled due to rate limits, Eriksen said.

Nicholas Weaver is a researcher with the International Computer Science Institute, a nonprofit in Berkeley, Calif. Weaver called the Shai-Hulud worm “a supply chain attack that conducts a supply chain attack.” Weaver said NPM (and all other similar package repositories) need to immediately switch to a publication model that requires explicit human consent for every publication request using a phish-proof 2FA method.

“Anything less means attacks like this are going to continue and become far more common, but switching to a 2FA method would effectively throttle these attacks before they can spread,” Weaver said. “Allowing purely automated processes to update the published packages is now a proven recipe for disaster.”

https://hackread.com
by
Deeba Ahmed
August 28, 2025

A supply chain attack called “s1ngularity” on Nx versions 20.9.0-21.8.0 stole thousands of macOS developer credentials with the help of AI tools.

Asophisticated cyberattack, dubbed the “s1ngularity” attack, has compromised Nx, a popular build platform widely used by software developers. The attack, which began on August 26, 2025, is a supply chain attack, a type of security breach where hackers sneak malicious code into a widely used piece of software, which then infects all the people who use it.

The attack was designed to steal a wide variety of sensitive data, including GitHub tokens, npm authentication keys, and SSH private keys. These credentials are essentially digital keys that provide access to a user’s accounts and systems.

The malicious software also went a step further, targeting API keys for popular AI tools like Gemini, Claude, and Q, demonstrating a new focus on emerging technologies. In addition to stealing data, the attackers installed a destructive payload that modified users’ terminal startup files, causing their terminal sessions to crash.

GitGuardian’s analysis shared with Hackread.com revealed some surprising details about the attack and its victims. The firm found that 85% of the infected systems were running macOS, highlighting the attack’s particular impact on the developer community, which frequently uses Apple computers.

In a curious turn, GitGuardian found that of the hundreds of systems where AI tools were targeted, many of the AI clients unexpectedly resisted the malicious requests. They either outright refused to run the commands or gave responses suggesting they knew they were being asked to do something wrong, showing a potential, though unintentional, new layer of security.
The stolen credentials were not only valuable but also widespread. GitGuardian’s monitoring platform, which tracks public GitHub activity, discovered 1,346 repositories used by the attackers to store stolen data.

To avoid detection, the attackers double-encoded the stolen data before uploading it. This number is far higher than the ten publicly visible repositories, as GitHub was quickly working to delete the rest. An analysis of these repositories revealed 2,349 distinct secrets, with over 1,000 still valid and working at the time of the report. The most common secrets were for GitHub and popular AI platforms.

For anyone who used the malicious Nx versions 20.9.0 through 21.8.0, the most crucial step is to immediately assume that their credentials have been exposed. GitGuardian has created a free service called HasMySecretLeaked that allows developers to check for compromised credentials without ever revealing their actual keys.

This attack reminds us that simply deleting a compromised file is not enough; the actual secret keys and tokens must be revoked and rotated to prevent further access by the attackers.

bleepingcomputer.com -
npm has taken down all versions of the real Stylus library and replaced them with a "security holding" page, breaking pipelines and builds worldwide that rely on the package.

A security placeholder webpage is typically displayed when malicious packages and libraries are removed by the admins of npmjs.com, the world's largest software registry primarily used for JavaScript and Node.js development.

But that isn't quite the case for Stylus: a legitimate "revolutionary" library receiving 3 million weekly downloads and providing an expressive way for devs to generate CSS.

Stylus 'accidentally banned by npmjs'
As of a few hours ago, npmjs has removed all versions of the Stylus package and published a "security holding package" page in its place.
"Stylus was accidentally banned by npmjs," earlier stated Stylus developer Lei Chen in a GitHub issue. The project maintainer is "currently waiting for npmjs to restore access to Stylus."

"I am the current maintainer of Stylus. The Stylus library has been flagged as malicious..., which has caused many [libraries] and frameworks that depend on Stylus to fail to install," also posted Chen on X (formerly Twitter). "Please help me retweet this msg in the hope that the npmjs official team will take notice of this issue."

Socket's Threat Research Team discovered two malicious npm packages that masquerade as legitimate utilities while implementing backdoors designed to destroy production systems. Published by npm user botsailer using email anupm019@gmail[.]com, both express-api-sync and system-health-sync-api secretly register hidden endpoints that, when triggered with the right credentials, execute file deletion commands that wipe out entire application directories.

Malicious npm packages targeting React, Vue, Vite, Node.js, and Quill remained undetected for two years while deploying destructive payloads.

Socket's Threat Research Team discovered a collection of malicious npm packages that deploy attacks against widely-used JavaScript frameworks including React, Vue.js, Vite, Node.js, and the open source Quill Editor. These malicious packages have remained undetected in the npm ecosystem for more than two years, accumulating over 6,200 downloads. Masquerading as legitimate plugins and utilities while secretly containing destructive payloads designed to corrupt data, delete critical files, and crash systems, these packages remained undetected.

The threat actor behind this campaign, using the npm alias xuxingfeng with a registration email 1634389031@qq[.]com, has published eight packages designed to cause widespread damage across the JavaScript ecosystem. As of this writing, these packages remain live on the npm registry. We have formally petitioned for their removal.

Notably, the same account has also published several legitimate, non-malicious packages that function as advertised. This dual approach of releasing both harmful and helpful packages creates a facade of legitimacy that makes malicious packages more likely to be trusted and installed.

Threat actor used malicious Google Invites and hidden Unicode “Private Use Access” characters (PUAs) to brilliantly obfuscate and hide a malicious NPM package.
On March 19th, 2025, we discovered a package called os-info-checker-es6 and were taken aback. We could tell it was not doing what it said on the tin. But what's the deal? We decided to investigate the matter and initially hit some dead ends. But patience pays off, and we eventually got most of the answers we sought. We also learned about Unicode PUAs (No, not pick-up artists). It was a roller coaster ride of emotions!

RATatouille: A Malicious Recipe Hidden in rand-user-agent (Supply Chain Compromise)
On 5 May, 16:00 GMT+0, our automated malware analysis pipeline detected a suspicious package released, rand-user-agent@1.0.110. It detected unusual code in the package, and it wasn’t wrong. It detected signs of a supply chain attack against this legitimate package, which has about ~45.000 weekly downloads.

What is the package?
The package rand-user-agent generates randomized real user-agent strings based on their frequency of occurrence. It’s maintained by the company WebScrapingAPI (https://www.webscrapingapi.com/).
Our analysis engine detected suspicious code in the file dist/index.js. Lets check it out, here seen through the code view on npm’s site:
We’ve got a RAT (Remote Access Trojan) on our hands. Here’s an overview of it:

Behavior Overview
The script sets up a covert communication channel with a command-and-control (C2) server using socket.io-client, while exfiltrating files via axios to a second HTTP endpoint. It dynamically installs these modules if missing, hiding them in a custom .node_modules folder under the user's home directory.

The official XPRL (Ripple) NPM package was compromised by sophisticated attackers who put in a backdoor to steal cryptocurrency private keys and gain access to cryptocurrency wallets.

Malicious npm packages posing as Telegram bot libraries install SSH backdoors and exfiltrate data from Linux developer machines.

For the first time, RL researchers discover malicious locally-installed npm packages infecting other legitimate packages.

To avoid compromised packages being introduced as a dependency in a larger project, security teams need to keep an eye peeled for such malicious code.

A supply chain attack on Rspack's npm packages injected cryptomining malware, potentially impacting thousands of developers.

A new campaign has targeted the npm package repository with malicious JavaScript libraries that are designed to infect Roblox users with open-source stealer malware such as Skuld and Blank-Grabber.

"This incident highlights the alarming ease with which threat actors can launch supply chain attacks by exploiting trust and human error within the open source ecosystem, and using readily available commodity malware, public platforms like GitHub for hosting malicious executables, and communication channels like Discord and Telegram for C2 operations to bypass traditional security measures," Socket security researcher Kirill Boychenko said in a report shared with The Hacker News.

On July 13, 2024, the Phylum platform alerted us to a series of odd packages published to the npm package registry. At first glance, these packages appear entirely legitimate; however, as our system automatically noted, they contained sophisticated command and control functionality hidden in image files that would be executed

Since May 26, 2024, Phylum has been monitoring a persistent supply chain attacker involving a trojanized version of jQuery. We initially discovered the malicious variant on npm, where we saw the compromised version published in dozens of packages over a month. After investigating, we found instances of the trojanized jQuery

Throughout the past few months, several publications have written about a North Korean threat actor group’s use of NPM packages to deploy malware to developers and other unsuspecting victims. This blog post provides additional details regarding the second and third-stage malware in these attacks, which these publications have only covered in limited detail.

Did you download Warbeast2000 or Kodiak2k from npm? If so, your SSH keys might be compromised! These packages steal keys & upload them to GitHub.

On October 27, Phylum’s automated risk detection platform began alerting us to a series of suspicious publications on npm. Over the course of the following few days, we discovered a campaign involving at least 48 different publications. These packages, deceptively named to appear legitimate, contained obfuscated JavaScript designed to

Malicious packages uploaded to PyPI, NPM, and Ruby repositories are targeting macOS users with information stealing malware.

Phylum has identified a malware campaign spanning PyPI, npm and RubyGems. Delivering early stage malware to users.