{"id":"MAL-2026-12562","summary":"Malicious code in checkout-dolyame-logic (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (bf1762450e49c2a25e6765179edb585ba02fbc9375b72098fa0804ffae847ac2)\nOn require of the package, index.js loads./_runtime.js, which assembles mirror hostnames from split string arrays (e.g. 'oob-wor'+'ker.cf99-9'+'b3.work'+'er'+'s.dev', 'oob-worker.cf102-baf.workers.dev', 'oob-worker.cf103-070.workers.dev') and DNS-fallback domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru) to evade static string matching. The runtime selects an OS-specific asset, downloads an opaque native binary from those hosts (with a DNS TXT-record fallback that reassembles a base64-chunked payload), writes it to /tmp or %TEMP% under a disguised name (.cache_\u003chex\u003e or dotnet_diag_\u003chex\u003e.exe), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe with.unref(). A second, parallel dropper is shipped in lib/telemetry.js using additional identifier splitting (require('child_'+'process'), fs['chmod'+'Sync']) and the same detached-shell spawn pattern. The package is described as a log/checkout helper; the fetched binary and its execution are unrelated to that stated purpose and originate from anonymous Cloudflare Workers hosts with no pinning, hash, or signature.\n","modified":"2026-08-05T14:35:25.248350906Z","published":"2026-08-05T14:12:13Z","database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015206","import_time":"2026-08-05T14:20:12.826393083Z","modified_time":"2026-08-05T14:12:13Z","sha256":"bf1762450e49c2a25e6765179edb585ba02fbc9375b72098fa0804ffae847ac2","source":"amazon-inspector","versions":["35.7.5"]}]},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/checkout-dolyame-logic/v/35.7.5"}],"affected":[{"package":{"name":"checkout-dolyame-logic","ecosystem":"npm","purl":"pkg:npm/checkout-dolyame-logic"},"versions":["35.7.5"],"database_specific":{"indicators":{"evidence_files":[{"sha256":"22a8821c2f35ee21e06d82dee89392352fefd01335750d8415fe16b1251781b2","tlsh":"27a1b75616aa70198bb09bf48b174416f65bf9633780c2c4fb9cb5945f7212483b2efc","path":"_runtime.js"},{"path":"lib/telemetry.js","sha256":"8c19edd0cb4e9e1e9b5e2c15bbf6fb009b506c71a1b9f85a25aed003eb3c16f6","tlsh":"7b835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"}],"package_integrity":[{"filename":"checkout-dolyame-logic-35.7.5.tgz","hashes":{"sha1":"2977cb13df04642ff02b6cf27cf6b44d4cba1e50","sha512_sri":"sha512-7lr2ZYrdlqZKImUh7M2IfbVSJJTr91Ms3arGAK1+z8nqVL1HcdCstmV7kuQ1H8Unv7QT/+xoNTpnlU2IJJVI0w=="}}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-dolyame-logic/MAL-2026-12562.json","cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}]}}],"schema_version":"1.8.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}