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Malicious package

simple-date-formatter-new-2npm

Advisory published Updated

simple-date-formatter-new-2 is a confirmed malicious npm package (MAL-2026-12194) 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-2 (npm)

MAL-2026-12194
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-date-formatter-new-2

What this malware does

The package presents itself as a trivial date-formatting utility (index.js exports a one-line wrapper around toLocaleDateString), but its package.json postinstall script runs a shell pipeline that probes sandbox and host state (tmpfs mount capability, bind-mount of /home/work, /proc/self/attr/current, LSM/AppArmor info, cgroups layout, /proc/partitions, and a listing of /home/work) and POSTs the combined output via curl to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo6, an interactsh/OAST out-of-band callback domain. The tarball additionally ships postinstall.js, which reads the installer's ~/.ssh directory, packages the filenames together with the local username and platform, and POSTs the JSON over HTTPS to the hardcoded IP 124.221.154.135:443/post; Chinese-language comments in that file describe stealing SSH keys and sending them to a C2. The benign facade contradicts the install-time behavior and the shipped stealer module.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

1a752053edcc35b1de91b1eb5bb0a8b18e22ac32120f4b8871ecf84c3c4aec54

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for simple-date-formatter-new-2 (version 1.0.0).

  2. If you installed it — respond

    simple-date-formatter-new-2 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-2 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-2 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-2026-014424

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-date-formatter-new-2-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-new-2 (npm) malicious package — MAL-2026-12194 | O3 Security