How to Defend Against Credential-Stealing Supply Chain Attacks on SAP npm Packages

Introduction

Recent security reports from Aikido Security, Onapsis, OX Security, SafeDep, Socket, StepSecurity, and Wiz have uncovered a dangerous supply chain attack campaign dubbed Mini Shai-Hulud. This campaign specifically targets SAP-related npm packages, injecting credential-stealing malware to compromise development pipelines and production environments. For any organization using npm packages alongside SAP systems, understanding how to detect and prevent such attacks is critical. This guide provides a step-by-step approach to secure your npm dependencies and protect your SAP infrastructure from these evolving threats.

What You Need

• npm CLI (version 6+ for audit features)
• Access to package registries (public npm or private mirrors)
• Security scanning tools (e.g., Socket, StepSecurity, or open-source alternatives)
• Dependency management files (package.json, package-lock.json)
• CI/CD pipeline access to integrate checks
• Incident response plan template

Step-by-Step Guide

Step 1: Understand the Threat Landscape

Before taking action, familiarize yourself with the Mini Shai-Hulud campaign. Attackers compromise legitimate npm packages by injecting malicious code that steals credentials—particularly tokens, API keys, and database passwords. The campaign focuses on packages related to SAP modules (e.g., @sap/* or sap-*). Knowing the attack pattern helps you prioritize scanning efforts.

Step 2: Audit All Existing Dependencies

Run a full audit of your project's npm dependencies. Execute npm audit in your project directory to identify known vulnerabilities. However, note that npm audit may not catch zero-day supply chain attacks. Supplement with:

• Review of package-lock.json for unexpected packages
• Cross-reference package names against threat intelligence feeds from the security vendors mentioned above
• Check for packages that are no longer maintained but still in use

Step 3: Verify Package Integrity

For each critical SAP-related npm package, verify its integrity:

1. Compare the package's checksum (SHA-1 or SHA-512) against the official source
2. Use npm view dist.tarball to download and hash it manually
3. If the package provides a PGP signature, verify it
4. Check the package's recent releases on the npm registry for any suspicious changes in version history

Step 4: Monitor for Suspicious Behavior

Implement runtime monitoring to detect credential exfiltration. Set up alerts for:

• Unexpected outbound network connections from npm processes
• File modifications outside the expected install directory
• Access to credential stores (e.g., environment variables, .npmrc files)

Use tools like Socket or StepSecurity that analyze package behavior statically and at runtime.

Step 5: Apply Least Privilege to npm Tokens

Limit npm authentication tokens to the minimum necessary scope. Avoid using tokens with publish or delete permissions in CI/CD environments. Regenerate tokens periodically and store them using a secrets manager. This reduces the blast radius if a token is stolen.

Step 6: Integrate Automated Security Scanning

Incorporate scanning into your CI/CD pipeline:

• Add a job that runs npm audit and fails on high-severity issues
• Use tools like Wiz or SafeDep to scan container images that include npm packages
• Set up dependency freshness checks to alert when a package version is outdated by more than a few days
• Consider using a private npm registry (like Verdaccio or JFrog Artifactory) with proxy caching and security policies

Step 7: Prepare an Incident Response Plan

Assume a compromise may occur. Document steps to:

1. Isolate affected systems (network segmentation)
2. Rotate all credentials stored in the compromised environment
3. Remove malicious packages with npm uninstall and revert to known-good versions
4. Notify stakeholders and relevant security teams
5. Conduct a post-mortem to improve defenses

Tips for Ongoing Protection

• Regularly update dependencies to patched versions, but always verify the update's source.
• Use a dependency lockfile (package-lock.json) to freeze versions and prevent surprise updates.
• Limit upfront trust in new packages—wait for community validation before adopting.
• Educate your team on social engineering tactics that attackers use to push malicious updates.
• Consider alternative package sources like npm with provenance attestations enabled (npm 9+).
• Subscribe to threat feeds from the security vendors that originally reported the Mini Shai-Hulud campaign.

By following these steps, you can significantly reduce the risk of credential theft from compromised SAP-related npm packages. Stay vigilant—supply chain attacks will only grow in sophistication.