MAL-2026-12610

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-claims-api-adapters/MAL-2026-12610.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12610
Published
2026-08-05T14:06:59Z
Modified
2026-08-05T14:35:48Z
Summary
Malicious code in claims-claims-api-adapters (npm)
Details

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

Source: amazon-inspector (dbf35d865ef56cd2fa5863a636bb33bf43d7afe418e9028c3bb73af13470bf63)

On require, index.js loads loader.js which selects a platform-specific temp path, downloads a binary over HTTPS from anonymous *.workers.dev hosts whose names are reconstructed at runtime by joining split string fragments (e.g. oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), writes the bytes to a stealth filename (dotnet_diag.exe on Windows,.cache_ on Linux/macOS), chmods 0755, and spawns it detached via /bin/sh -c or cmd. If HTTPS retrieval fails, the loader falls back to a covert DNS-TXT channel against sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, requesting c. for a chunk count and . for up to 2000 base64 chunks, concatenating and base64-decoding the result into the payload buffer that is then written and executed. No hash or signature verification is performed; destination hostnames are obfuscated to evade static inspection.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015170",
            "import_time": "2026-08-05T14:20:09.252257136Z",
            "modified_time": "2026-08-05T14:06:59Z",
            "sha256": "dbf35d865ef56cd2fa5863a636bb33bf43d7afe418e9028c3bb73af13470bf63",
            "source": "amazon-inspector",
            "versions": [
                "35.7.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-claims-api-adapters

Package

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

Affected ranges

Affected versions

35.*
35.7.9

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_loader.js",
            "sha256": "00f1fd8feab7d130438f016193a2648aa501283268f6255a96676bdbe48a6927",
            "tlsh": "fba1745a166970198bb0dbf4c7174415f65be6a33280c2c4f76ca9945fb3224c2b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "claims-claims-api-adapters-35.7.9.tgz",
            "hashes": {
                "sha1": "eaf62e87553e236c2ae9a9088dfd4e4eb309ecfe",
                "sha512_sri": "sha512-yg+rdQpOpjjBtYviksgZvviDelXjwbRO1KlEtfmXTmx5/Ka6SfZ8NmajYZ5K9Do42AX9Hd52PYAi2C0+GvzxVA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-claims-api-adapters/MAL-2026-12610.json"