MAL-2026-12728 Malicious code in devplatform-nx-stylelint (npm)

The package presents itself as an Nx stylelint helper but its main entry require()s platform.js, which on load downloads a platform-specific executable from one of four Cloudflare Workers hosts whose names are assembled at runtime via array-join concatenation (oob-worker.cf{99-9b3,101-adf,102-baf,103-070}.workers.dev). If HTTPS retrieval fails, it reassembles the payload from base64 chunks served in DNS TXT records under sdk/ext/pkg/net.dl.wel1.ru (reading a chunk count from c.<domain> and concatenating parts from <i>.<domain>). The bytes are written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755, and launched detached via cp.spawn("/bin/sh", ["-c", fp+" &"], {detached:true, stdio:"ignore"}).unref(). A marker file.analytics_state suppresses re-execution. lib/telemetry.js embeds a second copy of the same dropper (base64 chunk decoding, split "chmod"+"Sync" and cp.spawn("/bin/sh",…)) under an analytics-SDK cover story. The exported DevplatformNxStylelint class is a no-op stub; the package's only functional behavior is the dropper. Package naming impersonates the Nx stylelint ecosystem.

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.