MAL-2026-12551

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-create-draft-agreement-am/MAL-2026-12551.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12551
Published
2026-08-05T14:15:56Z
Modified
2026-08-05T14:35:19.439939706Z
Summary
Malicious code in checkout-create-draft-agreement-am (npm)
Details

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

Source: amazon-inspector (10d5b346e136a72594ca30d1e1d508bb152b82d20d8beb1d14bf126dd78b9977)

On require of checkout-create-draft-agreement-am, index.js loads polyfill.js which downloads a platform-specific native binary from Cloudflare Workers hosts whose names are assembled by joining split character arrays (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT covert fallback channel on *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru) that retrieves base64-chunked payloads via c.<domain> and i.<domain> TXT queries. The fetched bytes are written to /var/tmp/.cache<uid> (or Temp\dotnetdiag<uid>.exe on Windows), chmod 0755, and spawned detached via childprocess.spawn("/bin/sh" or "cmd"). No hash or signature verification is performed, hosts are unrelated to the package's declared 'checkout draft agreement' purpose, and the TTL marker is disguised as 'analyticsstate' with a self-labeled telemetry opt-out as cover.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "10d5b346e136a72594ca30d1e1d508bb152b82d20d8beb1d14bf126dd78b9977",
            "id": "IN-MAL-2026-015231",
            "modified_time": "2026-08-05T14:15:56Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:15.046589511Z",
            "versions": [
                "35.1.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-create-draft-agreement-am

Package

Name
checkout-create-draft-agreement-am
View open source insights on deps.dev
Purl
pkg:npm/checkout-create-draft-agreement-am

Affected ranges

Affected versions

35.*
35.1.1

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "45f9b40c9ce92c6ceb8ea5d302ed8a277fba505d83a9b5aa8b770a749f8807d8",
            "path": "_polyfill.js",
            "tlsh": "c0b1655a0666b0084af0e7e487178825f65ff6533781c284fb9c69945f7352483b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-Ot4qsmXOvVCkFjN6SVYTx6bnXUbVcyvXbUXJaMrl6aMQ7YGEITH8hPe7Fsj1RTfm1gCn0f2t2Ri9YWT2QUYUJQ==",
                "sha1": "2a91a820f541fba77f57469e54f4ac46f6e2e701"
            },
            "filename": "checkout-create-draft-agreement-am-35.1.1.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-create-draft-agreement-am/MAL-2026-12551.json"