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Malicious package

bnpl-blocks-mobile-bnpl-button-setnpm

Advisory published Updated

bnpl-blocks-mobile-bnpl-button-set is a confirmed malicious npm package (MAL-2026-12981) that steals credentials and exfiltrates sensitive data (malicious version 35.6.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bnpl-blocks-mobile-bnpl-button-set (npm)

MAL-2026-12981
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall bnpl-blocks-mobile-bnpl-button-set

What this malware does

On require() of the package, init.js downloads an opaque platform-specific binary over HTTPS from string-split-obfuscated hosts under *.workers.dev (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT covert-channel fallback that reads chunked base64 payload from c./0../N. subdomains of sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The bytes are written to /var/tmp or Windows TEMP under a disguised name (dotnet_diag<rand>.exe,.cache_<rand>), chmodded 0755, and detached-spawned via /bin/sh -c or cmd.exe. Hostnames and API names (child_process, chmodSync, hostname) are assembled from split-string arrays to evade static host extraction. A cooldown stampfile and opt-out env vars gate re-execution. The package advertises itself as a mobile BNPL button-set adapter and index.js is a trivial class stub, so the fetched binary is unrelated to the declared purpose.

Malicious versions

1 flagged
35.6.5

Indicators of compromise (SHA-256)

d860ca2d011c1e76bfee65b763f4a2d612dfad059ebbde41bb8cb79bc5680808

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for bnpl-blocks-mobile-bnpl-button-set (version 35.6.5).

  2. If you installed it — respond

    bnpl-blocks-mobile-bnpl-button-set is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If bnpl-blocks-mobile-bnpl-button-set 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-mobile-bnpl-button-set on npm has been identified as a malicious package (version 35.6.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015394

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks bnpl-blocks-mobile-bnpl-button-set-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

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bnpl-blocks-mobile-bnpl-button-set (npm) malicious package — MAL-2026-12981 | O3 Security