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Malicious package

simple-date-formatter-util-12npm

Advisory published Updated

simple-date-formatter-util-12 is a confirmed malicious npm package (MAL-2026-12201) 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-12 (npm)

MAL-2026-12201
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-date-formatter-util-12

What this malware does

package.json declares a postinstall script that, on npm install, collects installer reconnaissance (id, hostname, uname, cgroups, docker.sock, Linux capabilities, the Kubernetes service-account token at /var/run/secrets/kubernetes.io/serviceaccount/token, mounts, network config, ARP, PID1 cmdline, and environment variables filtered for kube/aws/token/secret/key/pass/role/region/cluster) and POSTs the collected data over plain HTTP to a Project Discovery interact.sh subdomain (http://ycrqyyjhwepdmhjifyccxss1hrks8lcd2.oast.fun/escinfo). The tarball also ships postinstall.js which enumerates the user's ~/.ssh directory and POSTs the contents plus username/platform to a hardcoded IP (https://124.221.154.135/post). The advertised functionality is a one-line formatDate wrapper around toLocaleDateString in index.js, which serves only as a cover for the malicious install-time payload.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

cdd747d615be16a4af8508b6151d829c49f8ba2e1d045b8c1cbc9d8f2f219de9

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for simple-date-formatter-util-12 (version 1.0.0).

  2. If you installed it — respond

    simple-date-formatter-util-12 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-12 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-12 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-2026-014430

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-date-formatter-util-12-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-12 (npm) malicious package — MAL-2026-12201 | O3 Security