simple-date-formatter-util-8npm
Advisory published Updated
simple-date-formatter-util-8 is a confirmed malicious npm package (MAL-2026-12206) that executes malicious code on install (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in simple-date-formatter-util-8 (npm)
What this malware does
package.json declares a postinstall lifecycle script that runs curl against the hardcoded bare-IP endpoint http://124.221.154.135/pre, passing the installer's hostname and username as query parameters ($(hostname), $(whoami)). The package presents itself as a trivial date-formatting utility, a purpose that has no need for network I/O at install time. The behavior fires automatically on npm install and leaks installer host identity to a non-first-party attacker-controlled endpoint.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for simple-date-formatter-util-8 (version 1.0.0).
If you installed it — respond
Remove simple-date-formatter-util-8 from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If simple-date-formatter-util-8 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
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks simple-date-formatter-util-8-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.