{"id":"MAL-2026-15604","summary":"Malicious code in @worrisome/reutil (npm)","details":"Published as part of a ClickFix-style fake-CAPTCHA phishing campaign documented by OX Security (see reference). The package's only file is index.html, declared as the npm \"main\" entry; package.json defines no preinstall/install/postinstall/prepare lifecycle script, so the payload does not execute at `npm install` time. index.html renders a fake Cloudflare Turnstile verification widget. An obfuscator.io-obfuscated inline script POSTs a hardcoded per-package \"hostKey\" to https://api.keyval.org/get, receives a base64-encoded IV:ciphertext pair, decrypts it client-side via the Web Crypto API (AES-CTR) using an embedded key to obtain a redirect URL, appends the visitor's original query-string parameters, and navigates the browser there via window.location.replace(). This \"dead drop\" design lets the operator change the phishing destination for every package sharing a hostKey without republishing to npm; OX Security observed keyval.org-served destinations including a typosquatted Microsoft login page and, at time of writing, a ChatGPT redirect. The package therefore does not attack the installing machine directly; it is used as a static file host on the npm CDN (e.g. unpkg/jsDelivr) so the index.html can be linked to and opened directly in a victim's browser as a phishing/ClickFix landing page. Published by npm user \"cattishly\" as part of a burst of near-identical single-purpose packages published between 2026-08-04 and 2026-08-24 that share this same fake-Turnstile-redirect page structure.","modified":"2026-08-31T07:15:14.130970972Z","published":"2026-08-26T14:55:09Z","references":[{"type":"WEB","url":"https://www.ox.security/blog/research-clickfix-phishing-npm-packages/"},{"type":"PACKAGE","url":"https://www.npmjs.com/package/@worrisome/reutil/v/1.0.3"}],"affected":[{"package":{"name":"@worrisome/reutil","ecosystem":"npm","purl":"pkg:npm/%40worrisome/reutil"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"versions":["1.0.0","1.0.1","1.0.2","1.0.3"],"database_specific":{"iocs":{"domains":["api.keyval.org"],"files":[{"digests":{"sha256":"f30a70e86f5aaf756b804cfbd337be56c785398e8b2bd1829bbbd680edae3f85"},"note":"Fake Cloudflare Turnstile page bundled as the package's main entry (from v1.0.3, the latest published version)","paths":["index.html"],"source":"PACKAGE_ARCHIVE"}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@worrisome/reutil/MAL-2026-15604.json"}}],"schema_version":"1.9.0","credits":[{"name":"OX Security","contact":["https://www.ox.security/"],"type":"FINDER"}]}