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Malicious package

boxy-wrapper-rspack-pluginnpm

Advisory published Updated

boxy-wrapper-rspack-plugin is a confirmed malicious npm package (MAL-2026-13098) that executes malicious code on install (malicious version 35.8.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in boxy-wrapper-rspack-plugin (npm)

MAL-2026-13098
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall boxy-wrapper-rspack-plugin

What this malware does

The package advertises itself as an rspack plugin but ships a stub index.js that silently require()s adapter.js, which runs at module load time. adapter.js constructs Cloudflare Workers hostnames via string-array joins (e.g. 'oob-worker.cf100-416.workers.dev', 'oob-worker.cf101-adf.workers.dev', 'oob-worker.cf99-9b3.workers.dev', 'oob-worker.cf102-baf.workers.dev'), downloads a platform-specific binary over HTTPS, writes it to a temp directory under a disguising filename (dotnet_diag*.exe /.cache*), chmods it 0o755, and spawns it detached via child_process. If the HTTPS fetch fails, loadViaDns() queries TXT records under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, base64-reassembles the chunked TXT payload into an executable buffer, and executes it the same way. Environment flags such as DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK and a /tmp/.analytics_state cache file provide a telemetry-style cover story. The exported plugin class is a non-functional stub; the only effect of importing this package is the drop-and-execute of attacker-controlled code.

Malicious versions

1 flagged
35.8.3

Indicators of compromise (SHA-256)

67161249eb0f14af2a3a30486a10b1a4a26cd7ea74a652b8783178b1db661b8c

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for boxy-wrapper-rspack-plugin (version 35.8.3).

  2. If you installed it — respond

    Remove boxy-wrapper-rspack-plugin 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 boxy-wrapper-rspack-plugin 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. boxy-wrapper-rspack-plugin on npm has been identified as a malicious package (version 35.8.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015278

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks boxy-wrapper-rspack-plugin-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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boxy-wrapper-rspack-plugin (npm) malicious package — MAL-2026-13098 | O3 Security