MAL-2026-12640

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-policy-details-domain/MAL-2026-12640.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12640
Published
2026-08-05T14:01:35Z
Modified
2026-08-05T14:36:03.017250945Z
Summary
Malicious code in claims-policy-details-domain (npm)
Details

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

Source: amazon-inspector (ddd2a9e4dd34aac1232648e9e5f459331bd73d0f3779ed68ac559d8f4692c9bb)

On require() of claims-policy-details-domain, index.js loads vendor.js which downloads a platform-specific binary from anonymous Cloudflare workers.dev subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS TXT covert-channel fallback under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru) that retrieves base64-chunked payload bytes via resolveTxt of c.<domain> and <N>.<domain>. The fetched bytes are written to disguised paths in /var/tmp or %TEMP% (e.g..cache<hex>, dotnetdiag<hex>.exe), chmod 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start /b (_vendor.js line 119, 121, 125). C2 hostnames are assembled from split string fragments to evade static analysis, and generic opt-out env vars plus a TTL cache reduce re-execution and observability. The package presents as an internal-namespace SDK at an unusually high version (35.9.3) with a trivial declared surface and an 81KB stub lib/telemetry.js, consistent with a dependency-confusion lure whose only material behavior is the dropper.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "ddd2a9e4dd34aac1232648e9e5f459331bd73d0f3779ed68ac559d8f4692c9bb",
            "id": "IN-MAL-2026-015134",
            "modified_time": "2026-08-05T14:01:35Z",
            "import_time": "2026-08-05T14:20:05.493459294Z",
            "source": "amazon-inspector",
            "versions": [
                "35.9.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-policy-details-domain

Package

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

Affected ranges

Affected versions

35.*
35.9.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "a76afbcb995e6c4a9ff47c0145885f8856d18a45e53e1d4fdbd834b621ae5936",
            "path": "_vendor.js",
            "tlsh": "75a1a69616a670088bb0dbf48717581af55bf6633380c294fb5c69885f7256483b2efc"
        },
        {
            "sha256": "cae1205bd3d3e1308d3069c2afd3e9875875e4beb6096fe5269b2eb6b94125c9",
            "path": "package.json",
            "tlsh": "dcd0a9624652a97b00f4e7cc68b5eb0bbe823f1f30788d063933622840e037518b831a"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-R7LOxjNuPuOn1BCO8uq1qqZ7RNnRFBa73vtNILjAMK18w+XqXIPNhqaXGYRZYJ5cG9GV3ctvEAcJ3WS6jdbG4Q==",
                "sha1": "d1dd4a490429ccb7d3fa718ac060973865dc6192"
            },
            "filename": "claims-policy-details-domain-35.9.3.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/claims-policy-details-domain/MAL-2026-12640.json"