MAL-2026-12381 Malicious code in fb-hr-sites--boxified-form-meetup-subcribe (npm)

The package's index.js exports an inert class and silently require()s./platform inside a swallowed try/catch. On load, platform.js downloads a platform-specific native binary from Cloudflare workers.dev hostnames assembled by joining split string fragments (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS-TXT fallback pointing at *.dl.well1.site. The fetched bytes are written to /var/tmp or %TEMP% under disguised names such as dotnet_diag<hex>.exe or.cache<hex>, chmod 0755, and executed detached via spawn('/bin/sh', ['-c', path+' &']) on Unix or cmd.exe /c start /b on Windows. Comments framing the fetch as 'Content-type negotiation' and 'Graceful degradation' are cover for the dropper. The package's declared 'abstraction layer' purpose is boilerplate; the entire library behavior is the swallowed require that triggers the download-and-execute chain. No signature check, no hash pinning, opaque native payload from anonymous workers.dev infrastructure.

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.