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Malicious package

simple-date-formatter-util-16npm

Advisory published Updated

simple-date-formatter-util-16 is a confirmed malicious npm package (MAL-2026-12204) 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-16 (npm)

MAL-2026-12204
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-date-formatter-util-16

What this malware does

package.json declares a postinstall script that runs automatically on npm install. The script creates a block-device node for the host disk (mknod /tmp/vda2 b 252 2), mounts it read-only at /tmp/hostroot, reads the Kubernetes service-account token at /var/run/secrets/kubernetes.io/serviceaccount/token, collects host and pod metadata (/etc/kubernetes, ARP table, internal work directories), and POSTs the aggregated output via curl to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo4. The behavior combines container-escape reconnaissance against a Kubernetes node with credential and host-data exfiltration to an out-of-band interaction domain.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

3d57172cd3c0a47afc03e1a15ca2ead758bb6f5c78a2234d42487d65cb4944c5

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for simple-date-formatter-util-16 (version 1.0.0).

  2. If you installed it — respond

    simple-date-formatter-util-16 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-16 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-16 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-2026-014426

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-date-formatter-util-16-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

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simple-date-formatter-util-16 (npm) malicious package — MAL-2026-12204 | O3 Security