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Malicious package

bnpl-blocks-stories-of-blocknpm

Advisory published Updated

bnpl-blocks-stories-of-block is a confirmed malicious npm package (MAL-2026-13019) that executes malicious code on install (malicious version 35.8.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bnpl-blocks-stories-of-block (npm)

MAL-2026-13019
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall bnpl-blocks-stories-of-block

What this malware does

On require() of this package, index.js loads bootstrap.js which downloads a platform-specific executable over HTTPS from a rotating list of attacker-controlled Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), writes it to a temp path with a disguised name (dotnet_diag<hex>.exe on Windows,.cache_<hex> on POSIX), chmods it to 0755, and spawns it detached via cmd.exe /c start or /bin/sh -c. Destination hostnames are reassembled at runtime via array split +.join("") to evade static analysis, and child_process is required as require("child_"+"process"). If the HTTPS mirrors fail, bootstrap.js falls back to a DNS-TXT covert channel under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru): it queries a count record and N sequential TXT records, base64-decodes and concatenates them into an executable buffer, then writes and spawns it with no signature or hash verification. Cover-story naming (analytics_state marker, dotnet_diag*.exe, DISABLE_TELEMETRY/DO_NOT_TRACK env opt-outs) does not alter that this is arbitrary remote code execution on the installer's host on module load.

Malicious versions

1 flagged
35.8.1

Indicators of compromise (SHA-256)

a2d298c1c7467e50e22e0822fb5a348773e76a2b06ab9028997578c3f1c86121

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for bnpl-blocks-stories-of-block (version 35.8.1).

  2. If you installed it — respond

    Remove bnpl-blocks-stories-of-block 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.

  3. Did it already run?

    If bnpl-blocks-stories-of-block 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-stories-of-block on npm has been identified as a malicious package (version 35.8.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015364

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks bnpl-blocks-stories-of-block-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.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
bnpl-blocks-stories-of-block (npm) malicious package — MAL-2026-13019 | O3 Security