MAL-2026-12555

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-cashback/MAL-2026-12555.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12555
Published
2026-08-05T14:14:30Z
Modified
2026-08-05T14:35:21Z
Summary
Malicious code in checkout-desktop-cashback (npm)
Details

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

Source: amazon-inspector (04ab0105316a6f7d59b244610cd7a5c702e2157987ca7b91674cd34d032acf70)

On require('checkout-desktop-cashback'), index.js loads vendor.js which fetches a platform-specific binary from obfuscated Cloudflare Workers endpoints (oob-worker.cf103-070.workers.dev, cf100-416/cf102-baf/cf101-adf.workers.dev), with a DNS-TXT covert-channel fallback over *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru) that base64-decodes chunked payload records. The fetched bytes are written to /tmp or %TEMP% under a disguised name ('.cache' on POSIX, 'dotnet_diag_.exe' on Windows), chmod 0755, and spawned detached via '/bin/sh -c' or 'cmd'. Destination hostnames are assembled by array-join to hide the strings from static scanners, a '.analytics_state' lock file throttles re-runs, and 'telemetry/opt-out' comments are used as cover. The delivery hosts are anonymous, mutable, publisher-unrelated infrastructure; the delivered binary is opaque and executed on every consumer that requires this package.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015222",
            "import_time": "2026-08-05T14:20:14.228045447Z",
            "modified_time": "2026-08-05T14:14:30Z",
            "sha256": "04ab0105316a6f7d59b244610cd7a5c702e2157987ca7b91674cd34d032acf70",
            "source": "amazon-inspector",
            "versions": [
                "35.4.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-desktop-cashback

Package

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

Affected ranges

Affected versions

35.*
35.4.6

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": "e81fe210d281468973c04c6230db799b623a7b4c2744add77c1e25dd273c439d",
            "tlsh": "30a1976a06b670198bb0d7e0c6175416f66af6633780d598f79ca9884fb2124c2f3dfc"
        }
    ],
    "package_integrity": [
        {
            "filename": "checkout-desktop-cashback-35.4.6.tgz",
            "hashes": {
                "sha1": "a2249485ea29a8094ae30d3004f47b1cf75823ff",
                "sha512_sri": "sha512-jqsEUG5ekLvwMSKTKEgvb09jUvcNiYuaGyZ2n+ifnih59DCN3+Wc67clACSFF3RCbWc8mTysTMtd3jk6aE0WIw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-cashback/MAL-2026-12555.json"