claims-payout-offer-api

{"modified":"2026-08-05T14:02:14Z","published":"2026-08-05T14:02:14Z","schema_version":"1.7.4","id":"MAL-2026-12632","summary":"Malicious code in claims-payout-offer-api (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (249e26d075d4551f9259568bb4029db870432feca831cb4cf7d26ffb7318605b)\nOn require() of the package, index.js loads _polyfill.js which reconstructs C2 hostnames from split string fragments (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT base64 code-channel fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The code selects a platform-specific payload, downloads it via https.get, writes it under a disguised name (e.g. dotnet_diag_*.exe on Windows,.cache_* under /var/tmp on Unix), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start. A sibling lib/telemetry.js duplicates the same dropper logic. Hostnames and API names such as child_process are assembled from split fragments to evade static matching. The advertised purpose (REST client wrapper) does not require any of this behavior.\n","affected":[{"package":{"ecosystem":"npm","name":"claims-payout-offer-api"},"versions":["35.7.6"],"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":"_polyfill.js","sha256":"9c9502da8bf5aebc28f1d506d3c0ef66a5d3096d990d947506150f80c657d8f5","tlsh":"a0a1a79a06a67019cbb0d7e48727581af65bf6633380c294fb5ca5985f770248372dfc"}],"package_integrity":[{"filename":"claims-payout-offer-api-35.7.6.tgz","hashes":{"sha1":"907874ad5988867f4f57534041441c8cc582eb18","sha512_sri":"sha512-Y6Mip5Jq+hVcbrSMkQfJeyIABZ01ND5tBwKFGWhqwzjJc+Dh0Gh9s2R6J48nj60jmOHlqRzq4C72T8xxnchbPQ=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/claims-payout-offer-api/v/35.7.6"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015138","import_time":"2026-08-05T14:20:05.933018441Z","modified_time":"2026-08-05T14:02:14Z","sha256":"249e26d075d4551f9259568bb4029db870432feca831cb4cf7d26ffb7318605b","source":"amazon-inspector","versions":["35.7.6"]}]}}