The 'notafollower1226' npm package versions 1.0.0 through 1.0.5 include a postinstall script that automatically runs on npm install. This script queries the ECS container metadata endpoint to gather the Task ARN, container image list, and logging configuration. It also enumerates environment variables for keys matching patterns related to ownership and authorship. The collected data is sent via a curl POST request to a hardcoded anonymous ngrok-free.dev subdomain, which is an ephemeral tunnel commonly used for supply-chain reconnaissance against CI/build infrastructure. The package lacks any other functionality consistent with its declared purpose, indicating its sole intent is to act as an exfiltration beacon.

Sensitive metadata and environment variables from ECS container environments are exfiltrated to an anonymous external endpoint. This can lead to exposure of internal infrastructure details, potentially aiding attackers in further reconnaissance or targeted attacks against CI/build systems. There is no indication of active exploitation in the wild at this time.

No official patch or remediation is currently documented. Users should avoid installing or using the 'notafollower1226' package versions 1.0.0 through 1.0.5. Review and remove the package from any build or deployment pipelines. Monitor for any unauthorized network traffic to suspicious external endpoints such as ngrok tunnels. Check vendor advisories or trusted security sources for updates or official fixes.