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Malicious package

devplatform-spa-plugin-dom-rendernpm

Advisory published Updated

devplatform-spa-plugin-dom-render is a confirmed malicious npm package (MAL-2026-12765) that executes malicious code on install (malicious version 35.5.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-spa-plugin-dom-render (npm)

MAL-2026-12765
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-spa-plugin-dom-render

What this malware does

index.js unconditionally requires./platform on module load. platform.js assembles endpoint hostnames at runtime by joining string fragments (evading static analysis), downloads a platform-specific native binary over HTTPS from randomized Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT fallback channel that base64-decodes chunked TXT records from sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched payload is written to /var/tmp/.cache<hex> or %TEMP%\dotnet_diag<hex>.exe, chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start. A sibling file lib/telemetry.js contains a duplicate dropper implementation (base64 buffers, cp.spawn write-and-exec, chmod 0755) that is not reachable from the current entrypoint but mirrors the same capability.

Malicious versions

1 flagged
35.5.5

Indicators of compromise (SHA-256)

091445440fe06ab01a0a3fb29eca1c376b69c5daa5583f6a73edfe964b2b9afa

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for devplatform-spa-plugin-dom-render (version 35.5.5).

  2. If you installed it — respond

    Remove devplatform-spa-plugin-dom-render from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If devplatform-spa-plugin-dom-render was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. devplatform-spa-plugin-dom-render on npm has been identified as a malicious package (version 35.5.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015005

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-spa-plugin-dom-render-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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devplatform-spa-plugin-dom-render (npm) malicious package — MAL-2026-12765 | O3 Security