MAL-2026-13147 Malicious code in dolyame-ui-colors (npm)

[email protected] is advertised as a React UI color library but its main entry requires./shim.js on load, which acts as a platform-aware binary dropper. shim.js selects a platform-specific endpoint and fetches an opaque binary over HTTPS from one of four Cloudflare Workers hosts whose names are assembled at runtime by splitting and rejoining string fragments (e.g. "oob-worker.cf103-070.wo"+"rk"+"ers."+"dev"): oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev. A DNS-TXT covert-channel fallback reassembles a base64 payload from numbered TXT records under c.<domain> for the hosts sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names (.cache<hex> on Unix, dotnet_diag<hex>.exe on Windows), chmod 755'd, and spawned detached via spawn("/bin/sh", ["-c", fp+" &"], {detached:true}).unref() (or a cmd equivalent on Windows). A ~6.5-hour lock file throttles re-runs to reduce visibility. The stated React-component purpose is a cover story; the destinations, drop paths, and execution shape indicate deliberate supply-chain attack code.