MAL-2026-12619

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-get-base-url/MAL-2026-12619.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12619
Published
2026-08-05T14:05:09Z
Modified
2026-08-05T14:35:52.362684177Z
Summary
Malicious code in claims-get-base-url (npm)
Details

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

Source: amazon-inspector (7e7b7dbbb58284ead0ecb4d93490e9683b4f58b31955d817de52495fb7399106)

index.js requires./setup on load, so any require() of this package triggers a dropper chain. setup.js selects a platform-specific payload path (linux/darwin/win32), downloads a binary over HTTPS from string-split-obfuscated hosts of the form oob-worker.cf10X-*.workers.dev with a DNS TXT-record fallback channel under sdk.dl.wel1.ru (hostnames are assembled at runtime via array joins such as ["oob-worker.cf102-baf.workers.de","v"].join("") to hide the.dev TLD from static scanners), writes it to a hidden path under /var/tmp or %TEMP% (.cache<hex> / dotnetdiag<hex>.exe), chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe with stdio ignored and unref()'d. lib/telemetry.js contains a second, dormant copy of the same dropper shape (base64 chunk assembly, chmod 0755, detached /bin/sh spawn), referencing childprocess as 'child_'+'process'. The package's advertised purpose ("claims get base url interface") has no legitimate need for cross-platform binary fetch-and-execute; the obfuscation, DNS fallback channel, and hidden dotfile staging are canonical import-time dropper tradecraft. Installing and loading this package runs attacker-controlled native code on the installer's machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "7e7b7dbbb58284ead0ecb4d93490e9683b4f58b31955d817de52495fb7399106",
            "id": "IN-MAL-2026-015157",
            "modified_time": "2026-08-05T14:05:09Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:07.900023887Z",
            "versions": [
                "35.4.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-get-base-url

Package

Name
claims-get-base-url
View open source insights on deps.dev
Purl
pkg:npm/claims-get-base-url

Affected ranges

Affected versions

35.*
35.4.5

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "384db83dcadb00c4c56739ce740aa8e093ef2a6519205c3ec6ededba89dba57e",
            "path": "setup.js",
            "tlsh": "14b1965a16aa70198bf0d7e0cb175815f65af6633380c2d4fb5ca4884f7612883b2dfc"
        },
        {
            "sha256": "f267201ef479a29acd2e40a222c6f1fd709fa19a04696bb70c96bafc36d2b31b",
            "path": "lib/telemetry.js",
            "tlsh": "99835055566a242186b2b378df234107ff3685272643429dbaec82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-nE+qkub7I2CtpKgdyRxFlNN2tUDsYtisH6/deN6NOSaIt35jx2KCcLj00cNsQFOZ0WaxjYOOHFuW5ScDi9norA==",
                "sha1": "5e85e6da95a66afc4b230ca34f1532c54a2e46da"
            },
            "filename": "claims-get-base-url-35.4.5.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-get-base-url/MAL-2026-12619.json"