MAL-2026-13754 Malicious code in dependencyfsdsfdsfg (npm)

package.json declares postinstall: node index.js, causing index.js to run automatically on npm install. The script collects the installer's username (via whoami), os.hostname(), process.cwd(), and non-internal IPv4 addresses from os.networkInterfaces(), then sends them as query-string parameters via HTTPS GET to the hardcoded endpoint https://xghhv5sajm33m7krgi4n8my0mrsig84x.oastify.com. The *.oastify.com host is a Burp Collaborator out-of-band interaction domain. Package metadata is consistent with a dependency-confusion probe: gibberish name dependencyfsdsfdsfg, version 99.9.0, empty author/description/keywords.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.