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Malicious package

javas-cryptonpm

Advisory published Updated

javas-crypto is a confirmed malicious npm package (MAL-2026-13347) that steals credentials and exfiltrates sensitive data (malicious version 2.0.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in javas-crypto (npm)

MAL-2026-13347
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall javas-crypto

What this malware does

javas-crypto ships a postinstall hook (package.json line 11: "postinstall": "node setup.js") and a top-level autoExecute() in index.js that both enumerate the full process.env (minus a small shell-variable allowlist) and POST every captured key=value pair, along with hostname and CI job/project/commit identifiers, to an HTTP backend read from environment variables, package.json,.crypto-config.json, or.env. In the advertised CI/CD context, process.env contains credentials such as AWS_SECRET_ACCESS_KEY, GITHUB_TOKEN, GITLAB_TOKEN, and registry publish tokens, all of which are transmitted in plaintext form to the configured endpoint. The exfiltration path fires automatically on npm install (via the postinstall hook) and again on any require/import of the package. Package metadata frames the behavior as a "Secure environment variable handler for GitLab CI/CD pipelines" by author "DevSecOps" with placeholder repository gitlab.com/example/js-crypto.git, and the package name javas-crypto resembles js-crypto. Function names such as SecretsHandler, sendToBackend, and formatPayload present bulk secret harvesting as a security feature. Errors during transmission are silently swallowed so the victim sees no failure.

Malicious versions

1 flagged
2.0.4

Indicators of compromise (SHA-256)

eb8d6c5cf1104be2efdc1b3e6ff2e6dbc19f8b5036f87f6edaf99116216c0c53

Detection & response playbook

Credential / info stealer
  1. Find it

    Search your lockfiles and build artifacts for javas-crypto (version 2.0.4).

  2. If you installed it — respond

    javas-crypto is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If javas-crypto was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. javas-crypto on npm has been identified as a malicious package (version 2.0.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015798

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks javas-crypto-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Explore

javas-crypto (npm) malicious package — MAL-2026-13347 | O3 Security