clients-structure

{"modified":"2026-08-05T14:00:13Z","published":"2026-08-05T14:00:13Z","schema_version":"1.7.4","id":"MAL-2026-12649","summary":"Malicious code in clients-structure (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (5dc3674a31787baaf2d3d554336f507ecce91da7b4d527a170c50cd720024d48)\nOn require() of clients-structure, index.js loads _ext.js which selects a platform-specific endpoint, fetches a binary from a rotating list of anonymous Cloudflare Workers subdomains (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT fallback channel over sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru that reconstructs a base64 payload chunked across numbered TXT records. The fetched bytes are written to a temp path, chmod 0755, and spawned detached via /bin/sh -c or cmd.exe. Destination hostnames are assembled at runtime from split string fragments joined via Array.join, and a /tmp/.analytics_state TTL marker plus an opt-out env-var facade serve as cover story. No hash or signature verification is performed, and the destinations bear no relation to any declared publisher.\n","affected":[{"package":{"ecosystem":"npm","name":"clients-structure"},"versions":["35.9.8"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"evidence_files":[{"path":"_ext.js","sha256":"2d89112237ab104562891445319cbfb3f0f6aef81534ea1f46e0327bec343899","tlsh":"40a1a69a02a970188bb0e7e4c7179825f61af663378082c4fb5c65944fb71248371dfc"}],"package_integrity":[{"filename":"clients-structure-35.9.8.tgz","hashes":{"sha1":"1bdb00708d7b30197e0aaabc572bedceb4354aef","sha512_sri":"sha512-EMMtqevESaXvV0/uSJTgEFffR/z79HL8munzAonVcL3o36YP2Q+/fa2TMy9OOASi4D2haYkLDkta7FNMJYuZ3g=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/clients-structure/v/35.9.8"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015125","import_time":"2026-08-05T14:20:04.624307044Z","modified_time":"2026-08-05T14:00:13Z","sha256":"5dc3674a31787baaf2d3d554336f507ecce91da7b4d527a170c50cd720024d48","source":"amazon-inspector","versions":["35.9.8"]}]}}