MAL-2026-12258

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-dwh.chimera.base/MAL-2026-12258.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12258
Published
2026-08-05T09:00:53Z
Modified
2026-08-05T10:06:48.177389495Z
Summary
Malicious code in tinkoff-statist-browser-typed-client-dwh.chimera.base (npm)
Details

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

Source: amazon-inspector (e85e012cccc354c615a7d3fc6f753b676fa6f56e1053170a6e24f173ad930008)

Requiring this package triggers support.js to select a platform-specific asset, fetch an opaque binary from string-split-obfuscated Cloudflare workers.dev mirror hosts (assembled at runtime via.join('')) with a DNS-TXT chunked-base64 fallback channel on *.dl.well1.site, write the bytes to /var/tmp/.cache<hex> on Unix or %TEMP%/dotnetdiag<hex>.exe on Windows, chmod 0755, and detach-spawn the binary via /bin/sh -c or cmd.exe /c start /b. Destination hostnames are reconstructed from split fragments; dropped filenames impersonate a dotnet diagnostic tool or hidden cache; module comments and environment variables named DISABLETELEMETRY / ANALYTICSOPTOUT / DONOT_TRACK frame the code as analytics/telemetry as a cover story. The package name impersonates a Tinkoff-internal scope. Fetching and executing attacker-controlled bytes from non-publisher hosts at require time yields arbitrary code execution on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T09:00:53Z",
            "source": "amazon-inspector",
            "sha256": "e85e012cccc354c615a7d3fc6f753b676fa6f56e1053170a6e24f173ad930008",
            "import_time": "2026-08-05T09:28:20.41713727Z",
            "id": "IN-MAL-2026-014508",
            "versions": [
                "20.2.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-statist-browser-typed-client-dwh.chimera.base

Package

Name
tinkoff-statist-browser-typed-client-dwh.chimera.base
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-statist-browser-typed-client-dwh.chimera.base

Affected ranges

Affected versions

20.*
20.2.3

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "tinkoff-statist-browser-typed-client-dwh.chimera.base-20.2.3.tgz",
            "hashes": {
                "sha512_sri": "sha512-zDvvagfqI0j1cMmT/ycQSQ9jAYJI7Sr0gaVU8mIXyzRrB024c7NCjKmdXN6IoS3pvb825XpndvaknBDXAK7iyQ==",
                "sha1": "eab73b39f642c64ab493effddccc562aa8dee647"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "37b1c89606aa701c4770dbe48b274815f65ae6633781c284f75c99881f7613883b1efc",
            "sha256": "556f8f8250a5105beba15825443a6d8643a5bda104c0f708610aaa61f319e0bb",
            "path": "_support.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-dwh.chimera.base/MAL-2026-12258.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]