MAL-2026-12582

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-molecule-mobile-status-sheet/MAL-2026-12582.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12582
Published
2026-08-05T14:09:38Z
Modified
2026-08-05T14:35:34.502055267Z
Summary
Malicious code in checkout-molecule-mobile-status-sheet (npm)
Details

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

Source: amazon-inspector (d49254998829dd2e5809cd78290939f76e37c2c82dcb75d4331703522b95adb0)

On require() of this package, index.js unconditionally loads compat.js, which fetches a platform-specific executable from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), writes it to /var/tmp or %TEMP% under decoy names (.cache<hex> or dotnetdiag<hex>.exe), chmods it 0755, and spawns it detached via /bin/sh -c or cmd. Endpoint hostnames are obfuscated by splitting them across string arrays joined at runtime to defeat static scanners. A DNS-TXT fallback channel under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru retrieves base64-encoded payload bytes across numbered TXT records and follows the same write-and-execute path, providing redundant covert delivery when HTTP egress is filtered. A TTL stamp file provides persistence between invocations. The package's advertised name bears no relation to the actual behavior.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "d49254998829dd2e5809cd78290939f76e37c2c82dcb75d4331703522b95adb0",
            "id": "IN-MAL-2026-015189",
            "modified_time": "2026-08-05T14:09:38Z",
            "import_time": "2026-08-05T14:20:11.218326004Z",
            "source": "amazon-inspector",
            "versions": [
                "35.7.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-molecule-mobile-status-sheet

Package

Name
checkout-molecule-mobile-status-sheet
View open source insights on deps.dev
Purl
pkg:npm/checkout-molecule-mobile-status-sheet

Affected ranges

Affected versions

35.*
35.7.9

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "521ca0d54ebf6cc2ef6feff6e67730440ab8ac37ec81a9357a4276ff54a92c49",
            "path": "_compat.js",
            "tlsh": "42a1849a1166301947b0dbe48b174416f65bf6633380c284fa6ca9945f77228c2b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-2hkBPnG3lrHJnxTuXP+VzqHQOpq/HmJDpcPIZifuZIGEawdvzlRA3T2nFaBkaCE9m57KOdWVLGkY0M++gbdaVQ==",
                "sha1": "c9320122738c6479085611308e2c4895a4a9dca2"
            },
            "filename": "checkout-molecule-mobile-status-sheet-35.7.9.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-molecule-mobile-status-sheet/MAL-2026-12582.json"