MAL-2026-12560

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-promocode/MAL-2026-12560.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12560
Published
2026-08-05T14:12:31Z
Modified
2026-08-05T14:35:24.019846961Z
Summary
Malicious code in checkout-desktop-promocode (npm)
Details

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

Source: amazon-inspector (19310e46ffcb5a99a81bab29f7260407b9fb6af5af72bdd8f3b9f7819cc6ffda)

On require() of checkout-desktop-promocode, index.js loads vendor.js which selects a per-platform endpoint, downloads a binary over HTTPS from obfuscated author-controlled hosts (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru, and oob-worker.cf*-*.workers.dev), with a DNS-TXT chunked base64 covert-channel fallback. The fetched bytes are written to /tmp or %TEMP% under an innocuous filename (.cache<rand> or dotnetdiag<rand>.exe), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. C2 hostnames are assembled at runtime by Array.join on fragment arrays (e.g. ["oob-worker.cf99-9b3.w","orker","s.d","ev"].join("")) to evade static string scanners, and log calls are stubbed to a no-op writer. The package advertises itself as a promocode SDK but ships none of that functionality; the only effect of importing it is arbitrary attacker code execution on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-05T14:12:31Z",
            "id": "IN-MAL-2026-015208",
            "import_time": "2026-08-05T14:20:13.010721638Z",
            "sha256": "19310e46ffcb5a99a81bab29f7260407b9fb6af5af72bdd8f3b9f7819cc6ffda",
            "versions": [
                "35.4.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-desktop-promocode

Package

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

Affected ranges

Affected versions

35.*
35.4.3

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "checkout-desktop-promocode-35.4.3.tgz",
            "hashes": {
                "sha512_sri": "sha512-udcDw4dSRO3LDQzSJo49PLDqKwpU+xeK3Z1J5bOdlsMBuotmVERMNuWyxshzFhgM1D3loq/YBrAHLdiU7ajk6g==",
                "sha1": "9e59095255eadaae411fdc5f6dfec0feeeee3dff"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "98a1769915aa70188bb097e487174415f65ae6a337c0c2d4fb9c99881fb61348372efc",
            "sha256": "2370ad07bdbfd5553407fd3f8d71dd30951a04a8634b2035f54797445a513b8e",
            "path": "_vendor.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-promocode/MAL-2026-12560.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]