SAP npm Packages Compromised by “Mini Shai-Hulud” Credential-Stealing Malware

Cybersecurity researchers are sounding the alarm about a new supply chain attack campaign targeting SAP-related npm Packages with credential-stealing malware.

According to reports from Aikido Security, SafeDep, Socket, StepSecurity, and Google-owned Wiz, the campaign – calling itself the mini Shai-Hulud – has affected the following packages associated with SAP’s JavaScript and cloud application development ecosystem –

• [email protected]
• @cap-js/[email protected]
• @cap-js/[email protected]
• @cap-js/[email protected]

“The affected versions introduced new installation-time behavior that was not previously part of these packages’ expected functionality,” Socket said. “The compromised releases added a preinstall script that acts as a runtime bootstrapper, downloading a platform-specific Bun ZIP from GitHub Releases, extracting it, and immediately executing the extracted Bun binary.”

✔ Approved Seller From Our Partners

Protect your privacy by Mullvad VPN. Mullvad VPN is one of the famous brands in the security and privacy world. With Mullvad VPN you will not even be asked for your email address. No log policy, no data from you will be saved. Get your license key now from the official distributor of Mullvad with discount: SerialCart® (Limited Offer).

➤ Get Mullvad VPN with 12% Discount

“The implementation also follows HTTP redirects without validating the destination and uses PowerShell with -ExecutionPolicy Bypass on Windows, increasing the risk for affected developer and CI/CD environments.”

Wiz noted that the malicious packages match several features present in previous TeamPCP operations, indicating that the same threat actor is likely behind the latest campaign.

The suspicious versions were published on April 29, 2026, between 09:55 UTC and 12:14 UTC. The poisoned packages introduce a new package.json preinstall hook that runs a file named “setup.mjs,” which acts as a loader for the Bun JavaScript runtime to execute the credential stealer and propagation framework (“execution.js”).

According to Aikido, the malware is designed to harvest local developer credentials, GitHub and npm tokens, GitHub Actions secrets, and cloud secrets from AWS, Azure, GCP, and Kubernetes. The stolen data is encrypted and exfiltrated to public GitHub repositories created on the victim’s own account with the description “A Mini Shai-Hulud has Appeared.” As of writing, there are more than 1,100 repositories with descriptions.

In addition, the 11.6 MB payload comes with capabilities to self-propagate through developer and release workflows, specifically using the GitHub and npm tokens to inject a malicious GitHub Actions workflow into the victim’s repositories to steal repository secrets and publish poisoned versions of the npm packages to the registry.

However, the latest incident bears significant differences from prior Shai-Hulud waves –

• All exfiltrated data is encrypted with AES-256-GCM and encapsulates the key using RSA-4096 with a public key embedded in the payload, effectively making it decipherable only to the attacker.
• It exists on Russian-locale systems.
• The payload commits itself into every accessible GitHub repository by injecting a “.claude/settings.json” file that abuses Claude Code’s SessionStart hook and a “.vscode/tasks.json” file with “runOn”: “folderOpen” setting so that any attempt to open the infected repository in Microsoft Visual Studio Code (VS Code) or Claude Code causes the malware to be executed.

“This is one of the first supply chain attacks to target AI coding agent configurations as a persistence and propagation vector,” StepSecurity said.

Found this article interesting? Follow us on Google News, Twitter and LinkedIn to read more exclusive content we post.