MAL-2026-12583

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-parameters/MAL-2026-12583.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12583
Published
2026-08-05T14:09:04Z
Modified
2026-08-05T14:35:34.746049801Z
Summary
Malicious code in checkout-parameters (npm)
Details

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

Source: amazon-inspector (cc0cff223506622cf77c0c0c038390701fbc4dfa3bb8a1be146263a9eede7774)

On require('checkout-parameters'), index.js loads _vendor.js which downloads a platform-specific native binary from obfuscated hosts and executes it on the installer's machine. Destination hostnames are reconstructed at runtime via string-split concatenation (e.g. array .join("") producing subdomains under .workers.dev, with a .dl.wel1.ru fallback) to hide them from static inspection. The fetched payload is written to a disguised hidden path (/var/tmp/.cache_<hex> on Unix, %TEMP%\dotnet_diag_<hex>.exe on Windows), chmod'd to 0755, and launched detached via /bin/sh -c or cmd /c start /b. A sibling module lib/telemetry.js ships the same fetch → base64-decode → write → chmod 0755 → spawn("/bin/sh",["-c", path+" &"]) pattern under an 'analytics SDK' cover story, and uses concatenated identifiers (require("child_"+"process"), fs["chmod"+"Sync"]) as further evasion. Installing or requiring this package results in arbitrary attacker-controlled code executing on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "cc0cff223506622cf77c0c0c038390701fbc4dfa3bb8a1be146263a9eede7774",
            "id": "IN-MAL-2026-015185",
            "modified_time": "2026-08-05T14:09:04Z",
            "import_time": "2026-08-05T14:20:10.687698322Z",
            "source": "amazon-inspector",
            "versions": [
                "35.8.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-parameters

Package

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

Affected ranges

Affected versions

35.*
35.8.5

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "bbae7c803f729966b4fa277f2821aef75ed6b89c999eb670ea7f0d6f54d816b4",
            "path": "_vendor.js",
            "tlsh": "ffa1979602a6b01c4fb0a7e4c61b8816f65bf663378181c4fb9c65985fb251483b2efc"
        },
        {
            "sha256": "418fd081150d4a4428552c48c11788f2624b11338ef5343e3b5dc62a55d42351",
            "path": "lib/telemetry.js",
            "tlsh": "b1835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-5KzSGht2wjrxx9gZYcXyFO/+RFBWnRmKd0bBFT+3I9p7k8141c0B1ySuF5NnU6IBNdgjeasiV6XU9SpR5AOONA==",
                "sha1": "8f6011576c0348265c22867c103853400073ac9d"
            },
            "filename": "checkout-parameters-35.8.5.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-parameters/MAL-2026-12583.json"