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Malicious package

beaver-ui-multi-select-with-allnpm

Advisory published Updated

beaver-ui-multi-select-with-all is a confirmed malicious npm package (MAL-2026-12818) that executes malicious code on install (malicious version 35.6.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in beaver-ui-multi-select-with-all (npm)

MAL-2026-12818
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall beaver-ui-multi-select-with-all

What this malware does

On require() of the package's main entry, index.js loads loader.js which selects a per-platform URL, downloads an opaque native binary from one of three Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT chunked-base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The bytes are written to /tmp/.cache<rand> or %TEMP%\dotnet_diag_<rand>.exe, chmod 0755, and spawned detached via /bin/sh -c or cmd /c start /b. Hostnames are assembled from split string arrays (e.g. ["oob-worker.cf99-9b3.wor","kers.","dev"].join("")) to evade substring scans, and file names (analytics_state, dotnet_diag) masquerade as diagnostics artifacts. A telemetry-styled opt-out gate (DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK) frames the download-and-execute as consented telemetry, but the default path is unconditional remote code execution. No hash or signature verification is performed; the URL is mutable and anonymous. The package name resembles a UI select component but its only observable behavior on import is the dropper.

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.

Malicious versions

1 flagged
35.6.4

Indicators of compromise (SHA-256)

bbb4bab7b1c75e94cd3411aa312a1313e3d5a84bed77943b10f8c969b751cb23
9c3519c1c22bb4eab75836d741089a70981c2909eea8323132d4424fb338f929

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for beaver-ui-multi-select-with-all (version 35.6.4).

  2. If you installed it — respond

    Remove beaver-ui-multi-select-with-all 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 beaver-ui-multi-select-with-all 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. beaver-ui-multi-select-with-all on npm has been identified as a malicious package (version 35.6.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015561GHSA-8f6w-27v9-924g

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks beaver-ui-multi-select-with-all-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

All malware advisories How O3 detects malware Vulnerability database
beaver-ui-multi-select-with-all (npm) malicious package — MAL-2026-12818 | O3 Security