MAL-2026-13203 Malicious code in dws-frontend-dws-frontend-core (npm)

On require() of this package, index.js loads support.js which downloads a platform-specific binary over HTTPS from author-controlled hosts under oob-worker.cf1*.workers.dev (with a DNS TXT-record base64 fallback under c.*.dl.wel1.ru). Destination hostnames are assembled via.join('') on split string fragments to evade static analysis. The fetched bytes are written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows — filenames disguised as a dotfile cache or a Microsoft.NET diagnostics binary — chmod 0755, and spawned detached via /bin/sh -c or cmd. A /tmp/.analytics_state marker file throttles re-execution, and the code pretends to honor DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK as a cover story despite the observed behavior being remote-binary execution rather than telemetry. No hash or signature verification is performed on the downloaded payload; the destination is not a publisher-owned or registry-hosted artifact.