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Malicious package

bnpl-blocks-data-schema-generatornpm

Advisory published Updated

bnpl-blocks-data-schema-generator is a confirmed malicious npm package (MAL-2026-12909) that executes malicious code on install (malicious version 35.2.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bnpl-blocks-data-schema-generator (npm)

MAL-2026-12909
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall bnpl-blocks-data-schema-generator

What this malware does

index.js unconditionally requires bootstrap.js, which on module load reconstructs Cloudflare Workers subdomains (oob-worker.cf10x-xxx.workers.dev) and *.dl.wel1.ru hosts from split string fragments, fetches a platform-specific executable via https.get with a DNS-TXT fallback that reassembles base64 chunks from numbered subdomains, writes the payload to a temp path under disguised names (e.g. dotnet_diag.exe,.cache_), chmods 0755 on Unix, and spawns it detached via /bin/sh -c or cmd.exe /c start. A second file lib/telemetry.js labelled as a telemetry SDK contains the same write+chmod+spawn primitives (Buffer.from(chunks,'base64'), cp.spawn('/bin/sh',['-c', filePath+' &']), fs['chmod'+'Sync'](extensionPath, 0755)) as a redundant dropper. The behavior fires whenever any consumer require()s the package, giving arbitrary remote code execution on the installer's host.

Malicious versions

1 flagged
35.2.1

Indicators of compromise (SHA-256)

b1e39c2d94a6114333c4275444d786188f00056a96e6e6296cd3abf275e3d5bc

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for bnpl-blocks-data-schema-generator (version 35.2.1).

  2. If you installed it — respond

    Remove bnpl-blocks-data-schema-generator 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 bnpl-blocks-data-schema-generator 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. bnpl-blocks-data-schema-generator on npm has been identified as a malicious package (version 35.2.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015469

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks bnpl-blocks-data-schema-generator-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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bnpl-blocks-data-schema-generator (npm) malicious package — MAL-2026-12909 | O3 Security