bnpl-blocks-desktop-bnpl-link-groupnpm
Advisory published Updated
bnpl-blocks-desktop-bnpl-link-group is a confirmed malicious npm package (MAL-2026-12931) that executes malicious code on install (malicious version 35.4.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bnpl-blocks-desktop-bnpl-link-group (npm)
What this malware does
On require of the package's main entry, index.js loads./vendor, which reconstructs Cloudflare Workers hostnames (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev) via runtime string concatenation, downloads platform-specific binary bytes, writes them to a disguised temp filename (.cache<hex> or dotnet_diag_<hex>.exe), chmods the file to 0755, and spawns it detached via /bin/sh -c '<path> &' on Unix or cmd.exe /c start /b on Windows. A DNS-based fallback discovery mechanism reassembles the domains sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru from split fragments. No hash or signature verification is performed on the downloaded payload, and the destinations are unrelated to any legitimate publisher of this package. A second copy of the dropper primitives (base64 chunk assembly, chmodSync to 0755, detached /bin/sh spawn, string-split require("child_"+"process")) is bundled in lib/telemetry.js. Cover-story comments frame the behavior as analytics/telemetry and cache validation.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for bnpl-blocks-desktop-bnpl-link-group (version 35.4.1).
If you installed it — respond
Remove bnpl-blocks-desktop-bnpl-link-group 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-link-group 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-link-group-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.