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Malicious package

devplatform-spa-plugin-module-loadernpm

Advisory published Updated

devplatform-spa-plugin-module-loader is a confirmed malicious npm package (MAL-2026-12772) that steals credentials and exfiltrates sensitive data (malicious version 35.8.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-spa-plugin-module-loader (npm)

MAL-2026-12772
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-spa-plugin-module-loader

What this malware does

On require, index.js unconditionally loads platform.js, which downloads a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev), with a DNS-TXT fallback that reassembles base64 chunks from subdomains of dl.wel1.ru. The fetched bytes are written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755, and detached-spawned via cp.spawn('/bin/sh', ['-c', fp+' &']) or the Windows equivalent. Destination hostnames and the child_process API name are assembled by joining split string fragments (e.g. ['sdk.','dl.wel1.','ru'].join('')); dropped-file names mimic legitimate cache/diagnostic paths; cover-story comments reference SHA-256 integrity checks and rate limiting with no matching code; an opt-out env var (DISABLE_TELEMETRY) frames the behavior as analytics. The workers.dev destinations are anonymous, mutable, and unrelated to any legitimate publisher of a module-loader package.

Malicious versions

1 flagged
35.8.5

Indicators of compromise (SHA-256)

902d3def6570c6efcdc3310f49ae60d22d25dce47bc8f6c8bb26292191c817a8

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for devplatform-spa-plugin-module-loader (version 35.8.5).

  2. If you installed it — respond

    devplatform-spa-plugin-module-loader is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If devplatform-spa-plugin-module-loader 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-module-loader on npm has been identified as a malicious package (version 35.8.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015003

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-spa-plugin-module-loader-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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devplatform-spa-plugin-module-loader (npm) malicious package — MAL-2026-12772 | O3 Security