MAL-2026-12267

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments/MAL-2026-12267.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12267
Published
2026-08-05T09:00:59Z
Modified
2026-08-05T10:06:52.180034389Z
Summary
Malicious code in tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments (npm)
Details

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

Source: amazon-inspector (86cb27375f9846c6aeba581e7e7ec6112eefd54f8d743638a1e803bde3d46616)

On require() of the package's main index.js, loader.js selects a platform-specific endpoint and fetches an opaque native binary over HTTPS from a rotating list of *.workers.dev hosts whose hostnames are assembled at runtime via string-split concatenation (e.g. ["oob-worker.cf1","01-adf.workers",".d","ev"].join("")). The fetched bytes are written to /var/tmp/.cache<hex> or %TEMP%\dotnetdiag<hex>.exe (a filename mimicking.NET diagnostics), chmod'd 0755, and spawned detached/unref'd via /bin/sh -c or cmd.exe /c start /b. If HTTPS fails, the loader falls back to DNS TXT queries against c.<domain> and numbered chunks under *.dl.well1.site zones (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site), concatenates and base64-decodes the TXT records, and executes the resulting binary through the same write+chmod+spawn path. The file uses variable names such as analyticsstate, telemetry, and a DISABLETELEMETRY env var, and lib/telemetry.js is a sibling with an equivalent chunked base64 write+chmod+spawn pathway. The package presents itself as an "arrestments provider" for an internal typed client and has no legitimate reason to fetch and execute anonymous binaries. No pinning, no hash verification, no publisher-controlled destination.

Database specific
{
    "malicious-packages-origins": [
        {
            "versions": [
                "20.8.3"
            ],
            "import_time": "2026-08-05T09:28:20.591752694Z",
            "sha256": "86cb27375f9846c6aeba581e7e7ec6112eefd54f8d743638a1e803bde3d46616",
            "modified_time": "2026-08-05T09:00:59Z",
            "id": "IN-MAL-2026-014509",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments

Package

Name
tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments

Affected ranges

Affected versions

20.*
20.8.3

Database specific

cwes
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-YjfMnJwcK4vCtaEkZbrVQi2jJUHqPKcdkw0KgEVZwx4F3PvgRTsHpHY2C/tmEE/msmB2xa9yqSaP2z+IVkJLdw==",
                "sha1": "e678c8f0176d0f0bd96be22291f5ff958ea678a5"
            },
            "filename": "tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments-20.8.3.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_loader.js",
            "sha256": "85b6000e52347dc2487cc72411940d10b78be1642a652bb2a7743b75f2c85447",
            "tlsh": "95a1959a156a701d4bb09be187174826f65af5633380c294fb9ca9941f72134c372efc"
        }
    ]
}
source
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments/MAL-2026-12267.json"