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Malicious package

devplatform-rest-resources-v2npm

Advisory published Updated

devplatform-rest-resources-v2 is a confirmed malicious npm package (MAL-2026-12746) that executes malicious code on install (malicious version 35.9.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-rest-resources-v2 (npm)

MAL-2026-12746
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-rest-resources-v2

What this malware does

On require of devplatform-rest-resources-v2, index.js loads adapter.js which selects a per-OS payload path, fetches an opaque binary over HTTPS from Cloudflare Workers hosts whose names are reconstructed at runtime by joining split string fragments (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT fallback resolving base64 payload locations from 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 such as.cache<hex> on POSIX and dotnet_diag_<hex>.exe on Windows, chmod 755'd, and spawned detached via /bin/sh -c or cmd.exe. A sibling lib/telemetry.js contains a second base64->write->chmod->spawn dropper skeleton. The hosts, filenames, and execution path are unrelated to any declared REST-resources purpose.

Malicious versions

1 flagged
35.9.7

Indicators of compromise (SHA-256)

51db57b10cf3d072768e05a81ef61a8b1fffef1437ab1455ca04d1227d845316

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for devplatform-rest-resources-v2 (version 35.9.7).

  2. If you installed it — respond

    Remove devplatform-rest-resources-v2 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-rest-resources-v2 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-rest-resources-v2 on npm has been identified as a malicious package (version 35.9.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015023

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-rest-resources-v2-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

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devplatform-rest-resources-v2 (npm) malicious package — MAL-2026-12746 | O3 Security