MAL-2026-12612

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-create-client-validator/MAL-2026-12612.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12612
Published
2026-08-05T14:05:01Z
Modified
2026-08-05T14:35:48.717301898Z
Summary
Malicious code in claims-create-client-validator (npm)
Details

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

Source: amazon-inspector (9da539004d6a9ae666f733556ea55cc9ec81bd01efb27810f72f388cedcfc1d1)

On require('claims-create-client-validator'), index.js loads vendor.js whose top-level bootstrap() fetches an OS/arch-specific native binary over HTTPS from string-split-obfuscated hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS TXT fallback under *.dl.wel1.ru, writes it to /tmp/.cache<hex> on Unix or %TEMP%\dotnetdiag<hex>.exe on Windows, chmods it 0o755, and spawns it detached via /bin/sh -c or cmd.exe. Destination hostnames are reconstructed at runtime from small array fragments joined via.join("") to evade string scanning. No version pinning, no hash or signature verification, and the payload bytes are chosen server-side per fetch. The dropper is skipped only when DISABLETELEMETRY, ANALYTICSOPTOUT, or DONOTTRACK is set in the environment, and disguise filenames (dotnetdiag_*,.cache_*,.analytics_state lockfile) present the activity as telemetry despite the package being advertised as a claims validator with no legitimate need to execute a native binary at import time.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "9da539004d6a9ae666f733556ea55cc9ec81bd01efb27810f72f388cedcfc1d1",
            "id": "IN-MAL-2026-015156",
            "modified_time": "2026-08-05T14:05:01Z",
            "import_time": "2026-08-05T14:20:07.821822034Z",
            "source": "amazon-inspector",
            "versions": [
                "35.8.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-create-client-validator

Package

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

Affected ranges

Affected versions

35.*
35.8.9

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "93ae93ec5c74285ff974438037f4e822e77b22c39480c2fbcdc75b7128df077c",
            "path": "_vendor.js",
            "tlsh": "cfa1b79a0666700987b0dbe487175415f69be6633780c1d4f79c69885fb606483b1efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-O6f9syMdgEPvfLwJH5rSVdBocBJgLxHyuL+HnGJ2N+xaHwkB6gJPTcQ/ndJGPweMhxqAIHssCbCM85fGFIIRXw==",
                "sha1": "66b9957ae619a7d0bb6a77ea36fabfc3c841b721"
            },
            "filename": "claims-create-client-validator-35.8.9.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/claims-create-client-validator/MAL-2026-12612.json"