{"id":"MAL-2026-12555","summary":"Malicious code in checkout-desktop-cashback (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (04ab0105316a6f7d59b244610cd7a5c702e2157987ca7b91674cd34d032acf70)\nOn require('checkout-desktop-cashback'), index.js loads _vendor.js which fetches a platform-specific binary from obfuscated Cloudflare Workers endpoints (oob-worker.cf103-070.workers.dev, cf100-416/cf102-baf/cf101-adf.workers.dev), with a DNS-TXT covert-channel fallback over *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru) that base64-decodes chunked payload records. The fetched bytes are written to /tmp or %TEMP% under a disguised name ('.cache_\u003chex\u003e' on POSIX, 'dotnet_diag_\u003chex\u003e.exe' on Windows), chmod 0755, and spawned detached via '/bin/sh -c' or 'cmd'. Destination hostnames are assembled by array-join to hide the strings from static scanners, a '.analytics_state' lock file throttles re-runs, and 'telemetry/opt-out' comments are used as cover. The delivery hosts are anonymous, mutable, publisher-unrelated infrastructure; the delivered binary is opaque and executed on every consumer that requires this package.\n","modified":"2026-08-05T14:35:21.750053118Z","published":"2026-08-05T14:14:30Z","database_specific":{"malicious-packages-origins":[{"versions":["35.4.6"],"id":"IN-MAL-2026-015222","import_time":"2026-08-05T14:20:14.228045447Z","modified_time":"2026-08-05T14:14:30Z","sha256":"04ab0105316a6f7d59b244610cd7a5c702e2157987ca7b91674cd34d032acf70","source":"amazon-inspector"}]},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/checkout-desktop-cashback/v/35.4.6"}],"affected":[{"package":{"name":"checkout-desktop-cashback","ecosystem":"npm","purl":"pkg:npm/checkout-desktop-cashback"},"versions":["35.4.6"],"database_specific":{"indicators":{"package_integrity":[{"filename":"checkout-desktop-cashback-35.4.6.tgz","hashes":{"sha1":"a2249485ea29a8094ae30d3004f47b1cf75823ff","sha512_sri":"sha512-jqsEUG5ekLvwMSKTKEgvb09jUvcNiYuaGyZ2n+ifnih59DCN3+Wc67clACSFF3RCbWc8mTysTMtd3jk6aE0WIw=="}}],"evidence_files":[{"path":"_vendor.js","sha256":"e81fe210d281468973c04c6230db799b623a7b4c2744add77c1e25dd273c439d","tlsh":"30a1976a06b670198bb0d7e0c6175416f66af6633780d598f79ca9884fb2124c2f3dfc"}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-cashback/MAL-2026-12555.json","cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}]}}],"schema_version":"1.8.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}