MAL-2026-12577

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-mobile-legal/MAL-2026-12577.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12577
Published
2026-08-05T14:10:44Z
Modified
2026-08-05T14:35:32.095885060Z
Summary
Malicious code in checkout-mobile-legal (npm)
Details

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

Source: amazon-inspector (5c9d5aebe1a3868e44878f382e7dfd21bcbebf8767f3ff0890b2d6330726f945)

On any require/import of this package, index.js loads init.js, which selects a platform-specific endpoint and downloads an opaque binary from author-controlled Cloudflare Workers subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev). The hostnames are assembled at runtime by joining string fragments (e.g., ["oob-worker.cf100-416",".work","ers.","dev"].join("")) to evade static inspection. The fetched bytes are written to /var/tmp (or %TEMP%) under disguised names (dotnetdiag<uid>.exe on Windows,.cache<uid> on POSIX), chmodded 0755, and executed detached via cp.spawn("/bin/sh", ["-c",...]) or cmd.exe with no hash, signature, or publisher verification. A DNS-TXT fallback under *.dl.wel1.ru subdomains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru) reassembles a base64-encoded payload from TXT records and executes it when HTTPS retrieval fails, a covert channel intended to bypass egress HTTP filtering. A marker file.analyticsstate and cover-story naming ("analytics SDK", dotnetdiag) present the code as telemetry, but the behavior is an unverified remote-code-execution dropper. Installing or importing this package hands arbitrary code execution to the package author on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "5c9d5aebe1a3868e44878f382e7dfd21bcbebf8767f3ff0890b2d6330726f945",
            "id": "IN-MAL-2026-015196",
            "modified_time": "2026-08-05T14:10:44Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:11.896860178Z",
            "versions": [
                "35.8.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-mobile-legal

Package

Name
checkout-mobile-legal
View open source insights on deps.dev
Purl
pkg:npm/checkout-mobile-legal

Affected ranges

Affected versions

35.*
35.8.8

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "f8b36e20e92f20ea493ebcb77682aa2516ac133ef7544f65d0ef1a40cc0d55dd",
            "path": "_init.js",
            "tlsh": "b9a1965a16a570188bb09be487275416f66bf6633380c2d8fb5ca5981f771288372efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-8gvYps/QQ5RRapS9SmUKlToHKAq0eXM+7G3EoB9Gvy8dx0tXNtiJ1Ct3oPFDmW3Kec1gG2kCuoknxp87/RuCPw==",
                "sha1": "fe3f793fca8b84c0e37d0340b041fad3a62ab7c2"
            },
            "filename": "checkout-mobile-legal-35.8.8.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-mobile-legal/MAL-2026-12577.json"