MAL-2026-12585

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-pay-widget-logic/MAL-2026-12585.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12585
Published
2026-08-05T14:09:46Z
Modified
2026-08-05T14:35:36Z
Summary
Malicious code in checkout-pay-widget-logic (npm)
Details

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

Source: amazon-inspector (3e25e8d60e2b9eb81d9e5de2e374fbf25b352e666d163d445461be9ac837669f)

On require('checkout-pay-widget-logic'), index.js loads./vendor.js which downloads a platform-specific binary over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf*.workers.dev), with a DNS TXT fallback under *.dl.wel1.ru that reassembles base64 chunks from TXT records. C2 hostnames are assembled at runtime by joining split string fragments to evade static detection. The fetched binary is written to /tmp or %TEMP% under disguised names (.cache on Unix, dotnet_diag_.exe on Windows, mimicking a Microsoft diagnostic tool), chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe with stdio ignored. A lock file named.analytics_state and 'telemetry'-labeled functions provide a cover story; the package's stated purpose is a 'log formatter'. Environment-variable opt-outs exist but the dropper runs by default.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015190",
            "import_time": "2026-08-05T14:20:11.33773427Z",
            "modified_time": "2026-08-05T14:09:46Z",
            "sha256": "3e25e8d60e2b9eb81d9e5de2e374fbf25b352e666d163d445461be9ac837669f",
            "source": "amazon-inspector",
            "versions": [
                "35.3.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-pay-widget-logic

Package

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

Affected ranges

Affected versions

35.*
35.3.2

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_vendor.js",
            "sha256": "c0b79fa22ec08ba2eb3049697964d89fa752e6bc4c08e0b88226e941bf2dada4",
            "tlsh": "89a1859a217671094bb0d7e0cb175416f66bf6a33380c598fa5ca5944f7612883b1efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "checkout-pay-widget-logic-35.3.2.tgz",
            "hashes": {
                "sha1": "7f1c334e873fabe4fea1a537febef6e18747765b",
                "sha512_sri": "sha512-VlHYX48pS438qK1rx/aBmz2o7/MpIGj8dizYjPRQVXXM7X8o0fX3lkBS7V65PYmf9X3f5GJhtANCdMn3it6mmw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-pay-widget-logic/MAL-2026-12585.json"