MAL-2026-12621

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-get-indexed-selector/MAL-2026-12621.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12621
Published
2026-08-05T14:06:00Z
Modified
2026-08-05T14:35:53.333729776Z
Summary
Malicious code in claims-get-indexed-selector (npm)
Details

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

Source: amazon-inspector (fe924c35590524d1632020cce8e08d68b232aa0d53b0f0ecb730f3ae87e07c35)

claims-get-indexed-selector@35.8.7 executes a binary dropper on module load. index.js unconditionally requires polyfill.js, which reassembles network destinations from split string arrays (hosts on cf*.workers.dev and *.dl.wel1.ru), downloads a native binary over HTTPS, writes it to /var/tmp/.cache<hex> or TEMP\dotnetdiag<hex>.exe with cover-story filenames, chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. If HTTPS retrieval fails, a covert DNS-TXT channel is used: a chunk-count TXT record at c.<domain> and base64-encoded payload chunks at <i>.<domain> are fetched and reassembled into the executable. No hash or signature verification is performed on the fetched binary. Destination hostnames are constructed from split arrays such as ["oob-worker",".cf103-070.","workers.","de","v"].join("") to evade static string scanning. The package is presented as a benign runtime support module; the delivered binary is opaque and the destinations are attacker-controlled.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "fe924c35590524d1632020cce8e08d68b232aa0d53b0f0ecb730f3ae87e07c35",
            "id": "IN-MAL-2026-015163",
            "modified_time": "2026-08-05T14:06:00Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:08.457516187Z",
            "versions": [
                "35.8.7"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-get-indexed-selector

Package

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

Affected ranges

Affected versions

35.*
35.8.7

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "7c823ab3268fe994e0fdf7e7d0be9883b0bd75fce706abcaddd1e540ad730f1d",
            "path": "_polyfill.js",
            "tlsh": "20b1a75a116670198bb0e7e4c717581af66af6637380c6d8fb5c55880f7712883b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-Ugwqk/DCrstfk9vKlzvFlH6E/8g2JEveNyNLOlBTbli2Yr3nfXSUy4I3knsL9nfGrW9u4Vg/maSO1r8k6HhnCA==",
                "sha1": "4edcb830138a61fa4e318c8ac56cb1aa6308d0f9"
            },
            "filename": "claims-get-indexed-selector-35.8.7.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-indexed-selector/MAL-2026-12621.json"