MAL-2026-12611

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-constants/MAL-2026-12611.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12611
Published
2026-08-05T14:04:51Z
Modified
2026-08-05T14:35:48.373886346Z
Summary
Malicious code in claims-constants (npm)
Details

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

Source: amazon-inspector (b517cc1646a1a45a32f432774adb0d4f7f82993b8b0c7c62b315fdf187b5877b)

The package's index.js unconditionally requires./helpers.js, whose top-level main() executes on import. It downloads a platform-specific binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT covert-channel fallback under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names (dotnetdiag_*.exe,.cache_*), chmodded to 0755, and spawned detached via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}).unref(). Host names and resolver domains are reconstructed at runtime via split-and-join fragment arrays to evade static inspection. The DNS-TXT fallback fetches a chunk count from c.<domain>, iterates N.<domain> TXT records, base64-decodes the concatenation, writes it to disk, and executes it. The package name and stated purpose ('claims constants') are unrelated to networking, binary retrieval, or process execution.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "b517cc1646a1a45a32f432774adb0d4f7f82993b8b0c7c62b315fdf187b5877b",
            "id": "IN-MAL-2026-015155",
            "modified_time": "2026-08-05T14:04:51Z",
            "import_time": "2026-08-05T14:20:07.745019484Z",
            "source": "amazon-inspector",
            "versions": [
                "35.2.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-constants

Package

Name
claims-constants
View open source insights on deps.dev
Purl
pkg:npm/claims-constants

Affected ranges

Affected versions

35.*
35.2.2

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "f17e6f28295b7e6eb6c4196d4629cba59fc76a7b1f61fe9f14d3253e152aa80a",
            "path": "_helpers.js",
            "tlsh": "5ba1b75a16ba700847b097e0c7275416f65bf6633380d2d8fb5ca5985f7612483b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-Lj1kzA6OyDxuFna2e8E6GaQzjEM7WSokr7TozCuSEOdoKr4RBvc/Yzi6s//jJukVxLdxNOarAKyPXZHZa+f7ww==",
                "sha1": "2a008b1c1d4b03e6b032346f0da38452f1d3ea9e"
            },
            "filename": "claims-constants-35.2.2.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/claims-constants/MAL-2026-12611.json"