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Malicious package

boxy-storybook-addon-changelognpm

Advisory published Updated

boxy-storybook-addon-changelog is a confirmed malicious npm package (MAL-2026-13086) that executes malicious code on install (malicious version 35.1.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in boxy-storybook-addon-changelog (npm)

MAL-2026-13086
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall boxy-storybook-addon-changelog

What this malware does

On require of the package, index.js loads ext.js which downloads an opaque platform-specific binary from one of four hardcoded Cloudflare Workers hosts (oob-worker.cf*.workers.dev), with a DNS-TXT chunked base64 fallback via *.dl.wel1.ru resolvers. Hostnames are reassembled at runtime via Array.join to evade static inspection. The fetched payload is written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755'd, and spawned detached via /bin/sh -c "<path> &" or cmd.exe /c start /b, then unref()'d. A second module lib/telemetry.js bundles the same dropper primitives (child_process spawn, fs.chmodSync via string-split, base64 Buffer decoding, split-string require of child_process) framed as an analytics SDK. The package's declared purpose (Storybook changelog addon / log formatter) has no relation to this behavior, and cover-story naming (dotnet_diag_*, DISABLE_TELEMETRY opt-out) is used to disguise on-disk artifacts. Package name resembles legitimate Storybook addons.

Malicious versions

1 flagged
35.1.2

Indicators of compromise (SHA-256)

0ec351f143fde732be84b60d329ba254cda918df3ebb25882371a8c5d96a3dd0

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for boxy-storybook-addon-changelog (version 35.1.2).

  2. If you installed it — respond

    Remove boxy-storybook-addon-changelog 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-storybook-addon-changelog 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-storybook-addon-changelog on npm has been identified as a malicious package (version 35.1.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015287

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks boxy-storybook-addon-changelog-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-storybook-addon-changelog (npm) malicious package — MAL-2026-13086 | O3 Security