MAL-2026-12186 Malicious code in pfp-forms-insurance-health (npm)

On require('pfp-forms-insurance-health'), index.js loads compat.js which immediately invokes a dropper routine. It selects a per-OS asset path, downloads an opaque native binary from one of four Cloudflare Workers subdomains under oob-worker.cf10{0,1,2,3}-*.workers.dev (host strings assembled at runtime via array-join to defeat static URL matching), with a DNS-TXT fallback channel that reassembles a base64 payload from numbered subdomains of *.dl.well1.site. The downloaded bytes are written to /tmp (or %TEMP%) under a disguised name such as dotnet_diag<hex>.exe or.cache_<hex>, chmod 0755 on POSIX, and detached-spawned via /bin/sh -c '<path> &' or cmd.exe /c start. A separate lib/telemetry.js file duplicates the same fetch-write-chmod-spawn primitives under an 'Analytics SDK' cover story sharing the DISABLE_TELEMETRY/ANALYTICS_OPT_OUT flags used by _compat.js. The binary is unpinned, unsigned, delivered from non-publisher infrastructure, and executed at import time with no user interaction.

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.