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Malicious package

jobber-app-template-reactnpm

Advisory published Updated

jobber-app-template-react is a confirmed malicious npm package (MAL-2026-11137) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.1, 1.1.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in jobber-app-template-react (npm)

MAL-2026-11137
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall jobber-app-template-react

What this malware does

The package's preinstall hook runs index.js which fires automatically on npm install. The script collects host reconnaissance (os.hostname(), os.userInfo().username, home directory, DNS servers, __dirname) and reads the contents of /etc/passwd and /etc/hosts from the installer's machine, then HTTPS-POSTs a JSON payload to the hardcoded Burp Collaborator subdomain 5tzh3l2e1cetr1chf6osh4tg57b0zqnf.oastify.com. The behavior is unrelated to the package's advertised purpose as a React app template and is characteristic of a dependency-confusion exfiltration payload.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

2 flagged
1.0.11.1.1

Indicators of compromise (SHA-256)

844a2ac73b588b6c0c7c370dd647685768992ff3e6b5ef492e6fc6dc6be240ce
5730446a57eddb68dce69772a61c937fdf59edbe7da88fdc2def5383aea446cf
168645cb7d79fb14fc92cbfa3644498542e9231231f0d468036c86430795c343

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for jobber-app-template-react (2 malicious versions).

  2. If you installed it — respond

    jobber-app-template-react 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 jobber-app-template-react 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. jobber-app-template-react on npm has been identified as a malicious package (versions 1.0.1, 1.1.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-010888GHSA-wvfj-f49f-7vqwIN-MAL-2026-019820

References

Credits

  • Amazon Inspector · finder

Detect & block this

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

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
jobber-app-template-react (npm) malicious package — MAL-2026-11137 | O3 Security