MAL-2026-13635 Malicious code in sme-rko-finance-front-operations-fee (npm)

The package's main entry (./lib/telemetry) and its _vendor.js module execute a binary dropper at require/import time. Hostnames and API identifiers are reconstructed from split-string arrays to evade static search — for example ["oob-worker.cf103-070.worke","rs.d","ev"].join("") and require("child_"+"process") / fs["chmod"+"Sync"]. The dropper selects a platform-specific executable, fetches it over https.get from anonymous Cloudflare workers.dev origins (oob-worker.cf103-070.workers.dev, cf100-416.workers.dev, cf99-9b3.workers.dev, cf101-adf.workers.dev), with a base64 DNS-TXT fallback channel over *.dl.wel1.ru (e.g. sdk.dl.wel1.ru). The fetched bytes are written to /var/tmp/.cache_<hex> on Linux or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755 is applied, and the file is spawned detached via /bin/sh -c "<path> &" or cmd /c start /b. A parallel dropper path inside lib/telemetry.js performs the same fetch → base64-decode → chmod +x → detached spawn sequence. No pinning, no signature verification, and mutable anonymous hosts. Installing or requiring the package results in remote code execution on the installer's host.