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Malicious package

simple-date-formatter-util-15npm

Advisory published Updated

simple-date-formatter-util-15 is a confirmed malicious npm package (MAL-2026-11545) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in simple-date-formatter-util-15 (npm)

MAL-2026-11545
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-date-formatter-util-15

What this malware does

package.json declares a postinstall shell pipeline that attempts to mknod and mount the host block device at /tmp/hostroot, enumerates /etc/kubernetes and kubelet pods, reads the Kubernetes service-account token at /var/run/secrets/kubernetes.io/serviceaccount/token, lists /home/work/skills/canvas-agent/, dumps /proc/net/arp, and POSTs the collected output via curl to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo4 (an interactsh OAST subdomain). A companion postinstall.js in the tarball enumerates the installer's ~/.ssh directory, collects filenames alongside os.userInfo(), and POSTs the result over HTTPS to the hardcoded IP 124.221.154.135:443/post. The package's declared purpose ("simple date formatter") has no relationship to reading Kubernetes secrets, host block devices, or SSH keys. Install-time execution of this script harvests container-escape and credential material and ships it to attacker-controlled destinations.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

4f79e44f447b3ebd6b246845f4c31bff0a0fe2e3bc45b220e1a952bf1ddc66bb

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for simple-date-formatter-util-15 (version 1.0.0).

  2. If you installed it — respond

    simple-date-formatter-util-15 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 simple-date-formatter-util-15 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. simple-date-formatter-util-15 on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-011324

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-date-formatter-util-15-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

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simple-date-formatter-util-15 (npm) malicious package — MAL-2026-11545 | O3 Security