MAL-2026-12051

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-ui-action/MAL-2026-12051.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12051
Published
2026-08-05T01:21:03Z
Modified
2026-08-05T01:49:56.340406675Z
Summary
Malicious code in tinkoff-ui-action (npm)
Details

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

Source: amazon-inspector (c00c178eed539f0535846617d7201e635f073f5f6477d7c9e2d1a6ce53f68d36)

On require of the package's main entry, compat.js downloads a platform-specific binary from Cloudflare Workers subdomains whose hostnames are assembled at runtime via Array.join to evade static analysis (e.g. oob-worker.cf*.workers.dev), with a DNS-TXT chunked-base64 fallback across tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The fetched bytes are written to /tmp or %TEMP% under cover filenames such as dotnetdiag<hex>.exe and.cache<hex>, chmodded 0755 on POSIX, and detached-spawned via /bin/sh -c '<path> &' or cmd.exe /c start /b <path>. lib/telemetry.js contains the same download-write-chmod-spawn pattern with obfuscated require("child_"+"process") and fs["chmod"+"Sync"] under an 'Analytics SDK' cover, providing a secondary payload runner. There is no hash or signature verification, no user consent, and the package is advertised as a React UI component library — a purpose unrelated to fetching and executing native binaries. Runtime string-splitting of both hostnames and dangerous API names is deliberate anti-analysis.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-05T01:39:31.47555814Z",
            "modified_time": "2026-08-05T01:21:03Z",
            "sha256": "c00c178eed539f0535846617d7201e635f073f5f6477d7c9e2d1a6ce53f68d36",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-011493",
            "versions": [
                "20.5.7"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-ui-action

Package

Name
tinkoff-ui-action
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-ui-action

Affected ranges

Affected versions

20.*
20.5.7

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-ui-action/MAL-2026-12051.json"
indicators 
{
    "package_integrity": [
        {
            "filename": "tinkoff-ui-action-20.5.7.tgz",
            "hashes": {
                "sha512_sri": "sha512-KXRMnPBlRa+ynzLDm5IuGPz7JLrpVfujLeEEhdUsQxrNtBa/hSn9fu1TuS2WC0RU58kw1+A3UqCjm9TFO0Airg==",
                "sha1": "41ce223754ea3e45f11daa5125f3bb98ed83f2c6"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "3eb1b8aa056670188bb0dbe587075416f65bf2637381c194fb5ca5885fb6224c3b2ffc",
            "sha256": "1a3ceaed24ab568fef3ea7348b71fd30160afc28a800a50cc2ba195ee839773e",
            "path": "_compat.js"
        },
        {
            "tlsh": "9d835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "0511599c0901e7e58289f5d0a6afb1dacc35c6b2376b29a39a1de863ce7f53f9",
            "path": "lib/telemetry.js"
        }
    ]
}
cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]