MAL-2026-12454 Malicious code in statist-browser-typed-client-social.shorts.editor (npm)

On require/import of this package, index.js unconditionally loads runtime.js, which fetches a platform-selected binary from rotating Cloudflare Workers subdomains (oob-worker.cf*.workers.dev) with a DNS-TXT chunked fallback via *.dl.well1.site, writes it to /var/tmp or %TEMP% under a disguised name (.cache<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), chmods it to 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Hostnames and sensitive identifiers (child_process, chmodSync) are reconstructed at runtime via string-split join and dynamic property assembly to evade static analysis. A secondary module lib/telemetry.js is framed as an analytics SDK but ships the same base64-decode + chmod-0755 + /bin/sh -c spawn dropper capability. The delivery infrastructure is anonymous, mutable, and unrelated to any legitimate publisher; the executed bytes are opaque and attacker-controlled. Installing or loading this package results in arbitrary code execution on the installer's host as a detached background process.

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.