MAL-2026-12590

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-resend-pos-order-sms-am/MAL-2026-12590.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12590
Published
2026-08-05T14:08:41Z
Modified
2026-08-05T14:35:39.064971220Z
Summary
Malicious code in checkout-resend-pos-order-sms-am (npm)
Details

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

Source: amazon-inspector (67d2c64d2c4df678c1c10b1ca9d9f386e8fd6dd9afe0cb804b11b9dff736ab11)

On require() of this package, index.js loads polyfill.js which reconstructs attacker-controlled hostnames via array-join concatenation (e.g. 'oob-worker.cf10x-*.workers.dev' variants) and issues an https.get to download a platform-specific executable. The bytes are written to /var/tmp/.cache<rnd> on Unix or %TEMP%\dotnetdiag<rnd>.exe on Windows, chmodded to 0755, and spawned detached via spawn('/bin/sh', ['-c', <path> + ' &']) or the Windows equivalent. A DNS-TXT base64-chunk fallback via .dl.wel1.ru resolvers is used when direct HTTPS fetch fails. The childprocess module reference and 'chmodSync' string are also concatenated at runtime ('child'+'process', 'chmod'+'Sync') to defeat static string matching. A sibling module lib/telemetry.js contains the same fetch/chmod-0755/sh-c-spawn dropper pattern, indicating shared payload infrastructure. The package's stated purpose (an SMS/POS order helper) is unrelated to downloading and executing native binaries from Cloudflare Workers subdomains, and the disguised on-disk filenames (.cache_, dotnetdiag*.exe) further indicate concealment rather than legitimate runtime setup.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "67d2c64d2c4df678c1c10b1ca9d9f386e8fd6dd9afe0cb804b11b9dff736ab11",
            "id": "IN-MAL-2026-015183",
            "modified_time": "2026-08-05T14:08:41Z",
            "import_time": "2026-08-05T14:20:10.518889894Z",
            "source": "amazon-inspector",
            "versions": [
                "35.3.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-resend-pos-order-sms-am

Package

Name
checkout-resend-pos-order-sms-am
View open source insights on deps.dev
Purl
pkg:npm/checkout-resend-pos-order-sms-am

Affected ranges

Affected versions

35.*
35.3.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "4bece4df171118308a7394fb35e5daa2eef40455de7e356ea199784731251984",
            "path": "_polyfill.js",
            "tlsh": "62a1969a066a701d4bb0abf4c61b441af65af6633280c194fb5ca9985f73514c3b2efc"
        },
        {
            "sha256": "faafc7b0651b1fe4174843149b850f88a102ffac01831b2188830b0eaf6dc3b5",
            "path": "lib/telemetry.js",
            "tlsh": "4c835055566a142186b2b368df234107ff3685272643429dbafc82dc1fbdb2092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-ZefcnBsHpxXOrAtskbkKcP6HMzoQUx6CvplDBTvy3xDVB4RWeu/smKsDHuCc7CZwx+8TZ/Hh5haTzXjdbhMnpA==",
                "sha1": "b1bce72ff4be9448db5a68e105dce2ee913492d9"
            },
            "filename": "checkout-resend-pos-order-sms-am-35.3.3.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-resend-pos-order-sms-am/MAL-2026-12590.json"