bnpl-blocks-atom-bnpl-base-popupnpm
bnpl-blocks-atom-bnpl-base-popup is a confirmed malicious npm package (MAL-2026-12865) that steals credentials and exfiltrates sensitive data (malicious version 35.2.9). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bnpl-blocks-atom-bnpl-base-popup (npm)
What this malware does
On require() of the package, index.js loads polyfill.js, which assembles Cloudflare Workers hostnames (oob-worker.cf100-416.workers.dev, cf102-baf/cf99-9b3/cf101-adf.workers.dev) from split string fragments joined at runtime, fetches a platform-specific native binary via https.get, writes it to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 755s it, and spawns it detached via /bin/sh -c '<file> &' or cmd /c start. DNS-TXT-chunked base64 fallback resolution is provided via reconstructed hostnames under dl.wel1.ru. Execution is gated by a /tmp/.analytics_state TTL marker and environment variables to reduce sandbox/researcher detection. A second file, lib/telemetry.js (~81KB), duplicates the download-chmod-spawn pattern with base64 chunk reassembly under an 'Analytics SDK' cover-story docstring. The main entry unconditionally requires _polyfill.js, so import of the package triggers download-and-execute of an opaque author-controlled binary on the installer's machine.
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for bnpl-blocks-atom-bnpl-base-popup (version 35.2.9). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging bnpl-blocks-atom-bnpl-base-popup across your stack and pipelines.
If you installed it — respond
bnpl-blocks-atom-bnpl-base-popup 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.
Did it already run?
If bnpl-blocks-atom-bnpl-base-popup was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks bnpl-blocks-atom-bnpl-base-popup before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks bnpl-blocks-atom-bnpl-base-popup-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.