MAL-2026-12564

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-get-installment-client-agreement-am/MAL-2026-12564.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12564
Published
2026-08-05T14:13:26Z
Modified
2026-08-05T14:35:26.456526067Z
Summary
Malicious code in checkout-get-installment-client-agreement-am (npm)
Details

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

Source: amazon-inspector (b6c89ae5bb381502715feea1642012fc1c9b388a46746b357a6d8f1348e876c9)

On require() of the package, init.js detects the host OS and architecture, assembles Cloudflare Workers hostnames from split string fragments (e.g. oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT fallback via *.dl.wel1.ru, downloads a platform-specific binary payload, writes it to /var/tmp or %TEMP% under disguised names (dotnetdiag<hex>.exe on Windows,.cache<hex> on Unix), chmods 0755, and spawns it detached via /bin/sh or cmd.exe. No signature or hash verification is performed. Comments describing the code as telemetry/analytics and referencing opt-out env vars are inconsistent with the disguised filenames, string-split host obfuscation, and DNS-TXT loader fallback. The dropper fires unconditionally on module load.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "b6c89ae5bb381502715feea1642012fc1c9b388a46746b357a6d8f1348e876c9",
            "id": "IN-MAL-2026-015215",
            "modified_time": "2026-08-05T14:13:26Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:13.571532573Z",
            "versions": [
                "35.1.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-get-installment-client-agreement-am

Package

Name
checkout-get-installment-client-agreement-am
View open source insights on deps.dev
Purl
pkg:npm/checkout-get-installment-client-agreement-am

Affected ranges

Affected versions

35.*
35.1.4

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "573e4c6c888391401b329c629352c72596e7dbb33a90c78303335340fcdde4d6",
            "path": "_init.js",
            "tlsh": "0db1a79616a6701c4bb09be4ca1b4429f65bf6633380c1c4f79c79885f7612483b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-vQxF0hMZBf6pqs7sZJ8BoNsffmyoM9BC9jqQgiwH4hxEvltJjmVC12aPZ4aztv7oQ90bMC8mh1xLM7VM1CuW5Q==",
                "sha1": "689093b3e700546ded8d67b65b3be410e6b558a7"
            },
            "filename": "checkout-get-installment-client-agreement-am-35.1.4.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-get-installment-client-agreement-am/MAL-2026-12564.json"