MAL-2026-12615

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-fixtures-shared/MAL-2026-12615.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12615
Published
2026-08-05T14:05:36Z
Modified
2026-08-05T14:35:50.877932570Z
Summary
Malicious code in claims-fixtures-shared (npm)
Details

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

Source: amazon-inspector (291919ef20015ad326b92c506f2df9e710e72e659499bfd240c9b6453bf0fd82)

On require('claims-fixtures-shared'), index.js loads helpers.js which immediately calls init(). init() reconstructs four Cloudflare Workers hostnames (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) and a set of DNS TXT-record resolvers (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru) via runtime array.join("") to evade static string scanners, then downloads a per-platform binary via https.get, writes it to /tmp or %TEMP% under a masquerading filename (.cache<rnd> on unix, dotnetdiag<rnd>.exe on Windows), fs.chmodSync 0o755, and spawns it detached via /bin/sh -c or cmd. No signature or hash verification is performed despite a '// SHA-256 integrity check' cover-story comment; a DNS TXT-record fallback channel and a.analyticsstate lock file for rerun throttling are present. The package's stated purpose is a trivial fixtures helper, unrelated to any native binary. Env-var opt-outs (DISABLETELEMETRY, DONOTTRACK) frame the code as telemetry while it stages and executes an arbitrary attacker-controlled payload.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "291919ef20015ad326b92c506f2df9e710e72e659499bfd240c9b6453bf0fd82",
            "id": "IN-MAL-2026-015160",
            "modified_time": "2026-08-05T14:05:36Z",
            "import_time": "2026-08-05T14:20:08.16829282Z",
            "source": "amazon-inspector",
            "versions": [
                "35.8.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-fixtures-shared

Package

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

Affected ranges

Affected versions

35.*
35.8.6

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "f3848197acb5dfbf1f7123cfbc00a859db2fc652489b4dca299628ab79dcacce",
            "path": "_helpers.js",
            "tlsh": "79a1855a06ba70194bb0dbe4871b4416f65bf6533280c6c4f7ac69985f7312483b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-qADl+WfhVIo2XE63EK2qk4d/1XIWy8gZ4woC0JJPfEmM5mYBp5LtAEavUdnCBJCEjOkZbhMWwKvy02JzqjG6OQ==",
                "sha1": "ff8fc9083abd8d3c8a7aa21e136433e92807d26c"
            },
            "filename": "claims-fixtures-shared-35.8.6.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-fixtures-shared/MAL-2026-12615.json"