MAL-2026-12567

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-input-card-logic/MAL-2026-12567.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12567
Published
2026-08-05T14:11:53Z
Modified
2026-08-05T14:35:27.954984176Z
Summary
Malicious code in checkout-input-card-logic (npm)
Details

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

Source: amazon-inspector (1cc552600295f6b008943a756a1cf29218d2e6d93a40dd72ea4cd06f039f80cb)

On require() of the package, index.js loads _vendor.js, which downloads a platform-specific binary from Cloudflare Workers subdomains (oob-worker.cf*.workers.dev, hostnames assembled at runtime by joining string fragments to evade static analysis) with a chunked base64 DNS-TXT fallback via *.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under cover names (.cache_<rand>, dotnet_diag_<rand>.exe, analytics_state), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. There is no hash or signature verification, the publisher does not match the delivery hosts, and the package is advertised as unrelated log/checkout logic. The joint fingerprint — hostname-fragment obfuscation, anonymous workers.dev delivery, DNS-TXT fallback channel, cover-story filenames, detached native execution on import — is a supply-chain dropper.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "1cc552600295f6b008943a756a1cf29218d2e6d93a40dd72ea4cd06f039f80cb",
            "id": "IN-MAL-2026-015204",
            "modified_time": "2026-08-05T14:11:53Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:12.630609993Z",
            "versions": [
                "35.8.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-input-card-logic

Package

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

Affected ranges

Affected versions

35.*
35.8.8

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "1cd9fa257d04f41950b8dcadff41d5b19e5d7ec33020a83bdd32af3bdcedd195",
            "path": "_vendor.js",
            "tlsh": "5ea1759a15a670098bb0ebf4c7175826f65be76333808588fb9c59884f7612483b1efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-iK945wik0bSTzYhjGOok9EOe/Mx1dlVK3xKPCrtkrh6MX4YL26flXd++GmkZFuSbVcPnJFAnx+oBnJ55Fzq7HQ==",
                "sha1": "2e77460cf82bd038a89202a4a8391045868a07c0"
            },
            "filename": "checkout-input-card-logic-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-input-card-logic/MAL-2026-12567.json"