MAL-2026-12562

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-dolyame-logic/MAL-2026-12562.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-12562

Published

2026-08-05T14:12:13Z

Modified

2026-08-05T14:35:25Z

Summary

Malicious code in checkout-dolyame-logic (npm)

Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (bf1762450e49c2a25e6765179edb585ba02fbc9375b72098fa0804ffae847ac2)

On 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 or dotnet_diag_.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.

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

https://www.npmjs.com/package/checkout-dolyame-logic/v/35.7.5

Credits

- Amazon Inspector - FINDER
- - inspector-research@amazon.com

Affected packages

npm / checkout-dolyame-logic

Package

Name: checkout-dolyame-logic; View open source insights on deps.dev
Purl: pkg:npm/checkout-dolyame-logic

Affected ranges

Affected versions

35.*

35.7.5

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": "_runtime.js",
            "sha256": "22a8821c2f35ee21e06d82dee89392352fefd01335750d8415fe16b1251781b2",
            "tlsh": "27a1b75616aa70198bb09bf48b174416f65bf9633780c2c4fb9cb5945f7212483b2efc"
        },
        {
            "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"