bnpl-blocks-atom-bnpl-skeletonnpm
Advisory published Updated
bnpl-blocks-atom-bnpl-skeleton is a confirmed malicious npm package (MAL-2026-12893) that executes malicious code on install (malicious version 35.6.3). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bnpl-blocks-atom-bnpl-skeleton (npm)
What this malware does
On require of the package's main entry, init.js fetches a platform-specific binary from obfuscated Cloudflare Workers hostnames (assembled by joining split substrings, e.g. oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS TXT chunked-base64 fallback to sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised filenames (dotnet_diag<token>.exe on Windows,.cache_<token> on Unix), chmod'd to 0755, and spawned detached via /bin/sh -c or cmd.exe. No source, hash, or signature is verified. A parallel dropper bundle in lib/telemetry.js replicates the same write-chmod-spawn primitive behind an analytics/telemetry cover story, with additional string-splitting obfuscation of sensitive APIs (require("child_"+"process"), fs["chmod"+"Sync"]). Any consumer importing this package executes arbitrary attacker-controlled native code on the host.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for bnpl-blocks-atom-bnpl-skeleton (version 35.6.3).
If you installed it — respond
Remove bnpl-blocks-atom-bnpl-skeleton 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-atom-bnpl-skeleton 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-atom-bnpl-skeleton-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.