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Malicious package

boxy-global-modules-webpack-pluginnpm

Advisory published Updated

boxy-global-modules-webpack-plugin is a confirmed malicious npm package (MAL-2026-13050) 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 boxy-global-modules-webpack-plugin (npm)

MAL-2026-13050
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall boxy-global-modules-webpack-plugin

What this malware does

On require of the package's main entry, loader.js immediately fetches a platform-specific opaque binary over HTTPS from hardcoded 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 under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. Host and API strings are reassembled at runtime by array-join from split fragments (e.g. ["oob-worker.cf103-070.workers.de","v"].join(""), ['sdk.dl.wel','1.ru'].join(""), "chmod"+"Sync") to evade static matching. The fetched bytes are written to /tmp or %TEMP% under a disguised name (.cache<hex> or dotnet_diag_<hex>.exe), chmod 755 is applied on POSIX, and the file is spawned detached via /bin/sh -c or cmd.exe with.unref(). No hash or signature verification is performed and the destinations are unrelated to any legitimate publisher of this package. In addition, lib/telemetry.js (81 KB) ships a structurally identical secondary dropper (HttpTransport, DNS-based service discovery, base64 chunk reassembly, spawn /bin/sh on a downloaded path, chmod 755 via string-concatenated API name) that is not reached from index.js in this version but is present in the tarball.

Malicious versions

1 flagged
35.5.5

Indicators of compromise (SHA-256)

6ce609c23d8c990c21c16692270dbb62589c6f63e716994c31e5ed4f466dcad7

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for boxy-global-modules-webpack-plugin (version 35.5.5).

  2. If you installed it — respond

    Remove boxy-global-modules-webpack-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-global-modules-webpack-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-global-modules-webpack-plugin 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-2026-015320

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks boxy-global-modules-webpack-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

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boxy-global-modules-webpack-plugin (npm) malicious package — MAL-2026-13050 | O3 Security