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Malicious package

simple-date-formatter-new-5npm

Advisory published Updated

simple-date-formatter-new-5 is a confirmed malicious npm package (MAL-2026-11543) 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-new-5 (npm)

MAL-2026-11543
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-date-formatter-new-5

What this malware does

Package advertised as a date-formatting utility performs supply-chain attack behavior. package.json declares a postinstall shell one-liner that, on npm install, collects kernel version, IP addresses, Kubernetes API probes, cloud instance metadata (AWS 169.254.169.254 and Alibaba 100.100.100.200), an internal /24 TCP scan, ARP/DNS data, and a listing of /var/run/secrets/kubernetes.io/serviceaccount/, then POSTs the aggregated output via curl to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo9. The main module (index.js) additionally enumerates ~/.ssh for key files on require() and issues an HTTPS POST containing the directory listing plus username and platform to hardcoded IP 124.221.154.135:443/post. The advertised formatDate export is a trivial cover for the exfiltration code paths.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

204253c08cc90b592f9c086ada633879141aee2bdf27e7286007c709f3b866ab

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for simple-date-formatter-new-5 (version 1.0.0).

  2. If you installed it — respond

    simple-date-formatter-new-5 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-new-5 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-new-5 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-2026-011326

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-date-formatter-new-5-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
simple-date-formatter-new-5 (npm) malicious package — MAL-2026-11543 | O3 Security