MAL-2026-12608

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-auth-domain/MAL-2026-12608.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12608
Published
2026-08-05T14:06:34Z
Modified
2026-08-05T14:35:46.966753691Z
Summary
Malicious code in claims-auth-domain (npm)
Details

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

Source: amazon-inspector (689620689df62b0e31d3caeb29327b88da40bae2bb66da3075dde6ee311ea6c3)

On require('claims-auth-domain'), index.js loads vendor.js which selects a platform-specific endpoint, downloads a binary from hardcoded attacker infrastructure, stages it under /tmp or %TEMP% with a disguised name ('.cache<hex>' on Unix, 'dotnetdiag<hex>.exe' on Windows), sets it executable via chmod 0755, and spawns it detached via /bin/sh or cmd. Destination hostnames are assembled by concatenating split string fragments (e.g. ['oob-worker.cf101-ad','f.work','ers','.d','ev'].join('')) to hide the C2 domains from static inspection. If HTTPS delivery from *.workers.dev fails, vendor.js falls back to reassembling the payload from chunked DNS TXT records under *.dl.wel1.ru: a count is fetched from c.<domain>, then N.<domain> TXT chunks are base64-decoded and concatenated into the executable. Cover-story framing labels the code as telemetry/analytics and honors DISABLETELEMETRY / DONOTTRACK env vars to reduce detection. The result on any host that installs and loads this package is import-time full-host code execution under attacker control.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "689620689df62b0e31d3caeb29327b88da40bae2bb66da3075dde6ee311ea6c3",
            "source": "amazon-inspector",
            "versions": [
                "35.5.4"
            ],
            "modified_time": "2026-08-05T14:06:34Z",
            "id": "IN-MAL-2026-015167",
            "import_time": "2026-08-05T14:20:08.838432283Z"
        }
    ]
}
References
Credits

Affected packages

npm / claims-auth-domain

Package

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

Affected ranges

Affected versions

35.*
35.5.4

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-auth-domain/MAL-2026-12608.json"
indicators 
{
    "evidence_files": [
        {
            "path": "_vendor.js",
            "sha256": "98aa24637f499852f29c9f5063675422878305a615c9efc0e6e065fb65749fba",
            "tlsh": "efb1746a166971188b70d7e486175016f66af6633690c5d8f69c68881fb3228c3b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "b33c20a018484b46fe042fb878cbabeb40ea2c52",
                "sha512_sri": "sha512-guSw9tN5dW7bRGdCUMMA6KrEYDI1SHe6oFxFsunimIMs8dZ4hjJSW6rkWNkS/y+0Pi6Y3UXLaSg81UUxDjUatg=="
            },
            "filename": "claims-auth-domain-35.5.4.tgz"
        }
    ]
}