MAL-2026-12413 Malicious code in pfp-forms-mobile-sme-group-tiles (npm)

On require(), polyfill.js selects a platform-specific path, retrieves an opaque binary over HTTPS from one of several *.workers.dev hosts whose names are assembled at runtime by joining split string fragments, writes it to /tmp or %TEMP% under a decoy name such as dotnet_diag<rand>.exe or.cache_<rand>, sets mode 0755 on POSIX, and spawns it detached via /bin/sh -c or cmd. A DNS-over-TXT fallback channel reassembles a base64 payload from numbered TXT records under *.dl.well1.site. Hostnames are constructed from arrays of fragments to evade string search, and a cooldown state file gates re-execution. The package advertises a 'merchant service layer' role and ships no legitimate need for a hidden native payload dropper.

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.