fb-forms-form-boilerplate-contactsnpm
fb-forms-form-boilerplate-contacts is a confirmed malicious npm package (MAL-2026-12380) that executes malicious code on install (malicious version 20.7.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in fb-forms-form-boilerplate-contacts (npm)
What this malware does
Package advertises itself as a form-boilerplate library but its top-level index.js unconditionally requires init.js, which on load downloads a platform-specific binary from author-controlled Cloudflare Workers endpoints (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT chunked fallback channel over well1.site subdomains (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site). Endpoint hostnames are reconstructed at runtime via array.join('') splits to defeat static analysis. The downloaded bytes are written to /tmp or the Windows TEMP directory under disguised names (.cache<uid>, dotnet_diag_<uid>.exe), chmodded 0755, and spawned detached via cp.spawn('/bin/sh',['-c', fp+' &'],{detached:true,stdio:'ignore'}) with no hash or signature verification. A /tmp/.analytics_state stamp file provides per-TTL dedup. A sibling lib/telemetry.js (81KB, not currently reached from index.js) mirrors the same dropper primitives (HTTPS endpoint rotation, DNS-based service discovery, base64 Buffer.from chunks, fs.chmodSync 0755, cp.spawn /bin/sh detached), staged for future activation. On npm install followed by any require of this package, an opaque attacker-controlled native executable runs with the installer's privileges.
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
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for fb-forms-form-boilerplate-contacts (version 20.7.1). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging fb-forms-form-boilerplate-contacts across your stack and pipelines.
If you installed it — respond
Remove fb-forms-form-boilerplate-contacts 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 fb-forms-form-boilerplate-contacts 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 fb-forms-form-boilerplate-contacts 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 fb-forms-form-boilerplate-contacts-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.