MAL-2026-12635

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-person-api-adapters/MAL-2026-12635.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12635
Published
2026-08-05T14:03:37Z
Modified
2026-08-05T14:36:00.025523114Z
Summary
Malicious code in claims-person-api-adapters (npm)
Details

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

Source: amazon-inspector (ef5943c3dd39268851fabc25f5a2c686cf8b102954be63cb80afb04c03deddc6)

On require() of the package, index.js loads ext.js which reconstructs hardcoded network destinations via Array.join string-splitting to evade static analysis, resolving to four Cloudflare Workers hosts of the form oob-worker.cf1{00-03}-*.workers.dev with a DNS-TXT chunked fallback across sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The module selects a platform-specific payload, downloads a binary via https.get, writes it to /var/tmp or %TEMP% under cover-story names such as.cache<hex> and dotnetdiag<hex>.exe, chmods it to 0755, and spawns it detached via /bin/sh -c on POSIX or cmd.exe /c start /b on Windows. There is no hash or signature verification of the fetched bytes, the destination hosts are unrelated to any documented publisher for a claims/person API adapter, and the reconstruction of URLs from split fragments plus DNS-TXT covert-channel fallback are evasion techniques rather than delivery hygiene. The package name suggests a benign adapter library, but its only observed effect on import is retrieving and executing attacker-controlled code on the installer host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "ef5943c3dd39268851fabc25f5a2c686cf8b102954be63cb80afb04c03deddc6",
            "id": "IN-MAL-2026-015147",
            "modified_time": "2026-08-05T14:03:37Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:06.976807173Z",
            "versions": [
                "35.2.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-person-api-adapters

Package

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

Affected ranges

Affected versions

35.*
35.2.4

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "41b9fa0e90c2bb2dc1d8999bc6d345254b427b0fa2600ae2febb08eb5e4c6475",
            "path": "_ext.js",
            "tlsh": "0db1b89a12a670194fb0dbe0cb1b8825f65bf66337808284f79c95845fb311483b2dfc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-RRmJYL8CjNDML4a8PwPLN4R7kgXzj9fYI3g2OXTHHiREj5frYoAzqyFYms/WTWgHpmfjwJFG7z34K0xZKaCCcg==",
                "sha1": "042c0d7a165bb6d53dbadc135e526f07dbfb163a"
            },
            "filename": "claims-person-api-adapters-35.2.4.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-person-api-adapters/MAL-2026-12635.json"