MAL-2026-10931

The org-twilio-phone-numbers-utils package is a dependency-confusion squat of Twilio's npm namespace published by user 'yuva2210' (maintainer email charankumarj2004@gmail.com) at sentinel versions 99.99.99 and 99.99.100, chosen to outrank any internal/private version and win resolution against a private registry. The npm description is empty and the package provides no legitimate functionality; the name mimics a plausible internal Twilio package so that a misconfigured resolver installs this public lookalike instead of the intended private dependency. It belongs to the same campaign as the actor's twilio-serverless/twilio-assets/twilio-deploy/twilio-internal squats and beacons to the same webhook.site collector.

The package declares a postinstall hook ("node index.js") that executes automatically on a bare npm install with no consent gate. The index.js payload performs environment reconnaissance: it collects the npm package name (npm_package_name), os.hostname(), the OS username (os.userInfo().username), and the current working directory, serializes them to JSON, and exfiltrates the bundle via HTTPS POST to a hardcoded anonymous dead-drop at https://webhook.site/42ce0f0e-a0a0-41b5-b157-1c0f918e064f. Request errors are swallowed so the install appears to succeed.

Two iterations were published: version 99.99.99 (payload 494 bytes, sha256 prefix 0ec56ada88db35b6) beacons only to the webhook.site collector, while version 99.99.100 (payload 688 bytes, sha256 prefix cebf45a0feba28b3) additionally beacons to a redundant out-of-band callback at 8060h91v8p1bvvr24e3r8s3z4qahy7mw.oastify.com, ensuring the reconnaissance lands even where HTTPS egress to webhook.site is blocked. Both payloads are byte-identical across all four packages in this sub-cluster (twiliointernal-messaging-toolbox, org-twilio-phone-numbers-utils, twilio-platform-request, twilio-platform-async-data-fetch).

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## Source: amazon-inspector (5e4fc6b0b947254720bbf5062747df2f6ad0b971c623ad42db5af303317957b4) org-twilio-phone-numbers-utils@99.99.100 is a dependency-confusion beacon package. Its package.json registers a postinstall hook that runs index.js, which collects the installer's package name, hostname (os.hostname()), username (os.userInfo()), and current working directory, then POSTs them via https to two hardcoded external destinations: webhook.site/42ce0f0e-a0a0-41b5-b157-1c0f918e064f and 8060h91v8p1bvvr24e3r8s3z4qahy7mw.oastify.com (a Burp Collaborator subdomain used for out-of-band reconnaissance). The name mimics an internal org-scoped Twilio helper and the inflated 99.99.100 version is chosen to win registry resolution against a private package of the same name. Execution is automatic on npm install; the installer has no opt-in and the collected identifiers reveal internal host and user names to the attacker.