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Malicious package

simple-date-formatter-new-3npm

Advisory published Updated

simple-date-formatter-new-3 is a confirmed malicious npm package (MAL-2026-12195) 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-3 (npm)

MAL-2026-12195
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-date-formatter-new-3

What this malware does

The package's postinstall script in package.json runs a shell pipeline that collects host and container-runtime information (kernel version via uname -r, /proc/1/cmdline, /proc/1/ns, root filesystem listing, block device listing) and POSTs the output via curl to the hardcoded interact.sh-style callback http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo7. The same pipeline attempts container-escape actions: creating a cgroup subtree under /sys/fs/cgroup/esc7, moving PID 0 into it, mknoding a block device at /tmp/x17, and mounting the host root filesystem at /tmp/hostroot, with results reported back to the same external endpoint. The tarball also ships a postinstall.js that enumerates the installer's ~/.ssh directory and POSTs the listing plus username/platform to the hardcoded IP 124.221.154.135:443/post, with in-source comments describing the behavior as SSH-key C2 exfiltration. All of this runs automatically on npm install with no user consent. The package name and stated purpose ("date formatter") do not match any of the observed behavior.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

eaef04a98dce874de04a92b580f4f919067a0e492d38dff69a57fc09db1cfe14

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for simple-date-formatter-new-3 (version 1.0.0).

  2. If you installed it — respond

    simple-date-formatter-new-3 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-3 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-3 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-2026-014421

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-date-formatter-new-3-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-3 (npm) malicious package — MAL-2026-12195 | O3 Security