bnpl-blocks-desktop-bnpl-floating-buttonnpm
Advisory published Updated
bnpl-blocks-desktop-bnpl-floating-button is a confirmed malicious npm package (MAL-2026-12922) that executes malicious code on install (malicious version 35.7.6). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bnpl-blocks-desktop-bnpl-floating-button (npm)
What this malware does
On require() of the package, index.js loads helpers.js which downloads a platform-specific binary from Cloudflare Workers hosts whose domain strings are reassembled at runtime via Array.join (e.g. oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS-TXT fallback channel to *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched bytes are written to /tmp or %TEMP% under deceptive names (.cache<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c "<path> &" or cmd.exe /c start /b. A '.analytics_state' marker file and 'telemetry'/'dotnet_diag' naming are used as cover. There is no hash or signature verification, the payload URL is unpinned and mutable, and the harm fires automatically on module load.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for bnpl-blocks-desktop-bnpl-floating-button (version 35.7.6).
If you installed it — respond
Remove bnpl-blocks-desktop-bnpl-floating-button 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.
Did it already run?
If bnpl-blocks-desktop-bnpl-floating-button 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
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks bnpl-blocks-desktop-bnpl-floating-button-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.