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Malicious package

action-slack-message-rootnpm

Advisory published Updated

action-slack-message-root is a confirmed malicious npm package (MAL-2026-16323) that steals credentials and exfiltrates sensitive data (malicious version 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in action-slack-message-root (npm)

MAL-2026-16323
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall action-slack-message-root

What this malware does

package.json declares scripts.preinstall = 'node index.js', which runs automatically on npm install. index.js collects host reconnaissance — os.hostname(), os.platform(), os.arch(), os.release(), os.uptime(), os.cpus(), memory info, and the output of shell commands whoami, id, pwd, and uname -a via child_process — and POSTs the JSON payload over plain HTTP to a hardcoded Burp Suite Collaborator subdomain at http://x86cmb7n60gbagfm4fdws0nw5nbjzanz.oastify.com. The package name resembles legitimate Slack-notification tooling, but the shipped code performs only reconnaissance exfiltration with no advertised functionality. The tarball also declares an unpinned dependency on openmct-heatmap ^1.0.1, consistent with a dependency-confusion / research-probe shape.

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

1 flagged
1.0.1

Indicators of compromise (SHA-256)

6d5f3deb6623e5340770d4e8866adc3d7239938e5adefc4b699c897287d84eba
3ee3ee5a7d3b1f3cc29a7439cd940b7821e5735ae2f7f873b8cd540115315b8b

Detection & response playbook

Credential / info stealer
  1. Find it

    Search your lockfiles and build artifacts for action-slack-message-root (version 1.0.1).

  2. If you installed it — respond

    action-slack-message-root 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 action-slack-message-root 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. action-slack-message-root on npm has been identified as a malicious package (version 1.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020226GHSA-mrmw-mqq6-fp9w

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks action-slack-message-root-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

action-slack-message-root (npm) malicious package — MAL-2026-16323 | O3 Security