MAL-2026-12639

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-policy-details-api-adapters/MAL-2026-12639.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12639
Published
2026-08-05T14:02:06Z
Modified
2026-08-05T14:36:02.754584162Z
Summary
Malicious code in claims-policy-details-api-adapters (npm)
Details

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

Source: amazon-inspector (e2500b36f91161fd5530acaf1ddc9c5af050b9d874dae9924f686f45f2dbe721)

On require of the package, index.js loads loader.js which downloads a platform-specific binary from string-split-obfuscated hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT chunked-base64 fallback channel across sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under cover names such as.cache<hex> or dotnetdiag<hex>.exe, chmodded to 0755, and spawned detached via spawn("/bin/sh", ["-c", <path> + " &"], {detached:true, stdio:"ignore"}). Hostnames are assembled from split arrays (e.g. ["oob-worker.cf103-070.wo","rke","rs.dev"].join("")) and no hash or signature verification is performed despite comments referencing SHA-256 integrity. The DNS-TXT retrieval path queries c.<domain> for a chunk count and N.<domain> for base64 chunks that are concatenated and decoded to a Buffer, providing a covert channel that bypasses URL/domain egress controls.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "e2500b36f91161fd5530acaf1ddc9c5af050b9d874dae9924f686f45f2dbe721",
            "id": "IN-MAL-2026-015137",
            "modified_time": "2026-08-05T14:02:06Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:05.843913463Z",
            "versions": [
                "35.3.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-policy-details-api-adapters

Package

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

Affected ranges

Affected versions

35.*
35.3.1

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "5971ac06f917e4b3aa669a4de5558b306197ef78ae532269f6060d3e4c84efd5",
            "path": "_loader.js",
            "tlsh": "d1a1b75b066671198bb0dbe4c71b8816f65ee6633380c198fb9c69985f73124c2b2dfc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-xZtSjHeDlMmNT2Q9A1S77qluTVwmw3ukexT3hbuhg3lhcLD5kPFyZyCxiXXCINMqgHWZQeOtgDtPSGPgHUvB3A==",
                "sha1": "a5e203cf68700ab1bf9ad53b14d13f681ffc0436"
            },
            "filename": "claims-policy-details-api-adapters-35.3.1.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-api-adapters/MAL-2026-12639.json"