MAL-2026-12255

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-cardsmobile.events.promotest/MAL-2026-12255.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12255
Aliases
  • GHSA-rr93-6qpg-mg6r
Published
2026-08-05T09:00:46Z
Modified
2026-08-06T01:21:33.488027417Z
Summary
Malicious code in tinkoff-statist-browser-typed-client-cardsmobile.events.promotest (npm)
Details

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

Source: amazon-inspector (4185505bd2dc58df4422a0293f5dff2db30a75a0002171bff425c85de1923bbb)

On require of the package, index.js loads polyfill.js, which selects a per-OS/arch asset path and downloads a binary from one of three hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT chunked-base64 fallback via tin.dl.well1.site / tina.dl.well1.site / ldr.dl.well1.site / win.dl.well1.site. Destinations are assembled at runtime by joining split string fragments to hide them from inspection. The fetched bytes are written to /var/tmp/.cache<rand> on POSIX or to the Windows temp directory as dotnetdiag<rand>.exe, chmod'd 0755, and spawned detached via /bin/sh -c '<path> &' or cmd /c start /b. Cover-story comments reference a nonexistent SHA-256 integrity check and telemetry opt-out env vars (DISABLETELEMETRY, ANALYTICSOPTOUT, DONOT_TRACK) that do not actually gate the dropper. A second copy of the dropper primitives (base64 decode, chmod 0755, detached /bin/sh spawn) is bundled in lib/telemetry.js (~81KB, framed as an 'Analytics SDK'), dormant but enabled by a one-line require change. Package name typosquats a Tinkoff-branded internal package.

Source: ghsa-malware (f702f291b4278d17fc004a321e2ff0af0a38c2a73e969a6e2ffc9b41f07ca714)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-05T09:28:20.169213761Z",
            "modified_time": "2026-08-05T09:00:46Z",
            "sha256": "4185505bd2dc58df4422a0293f5dff2db30a75a0002171bff425c85de1923bbb",
            "id": "IN-MAL-2026-014507",
            "versions": [
                "20.8.7"
            ],
            "source": "amazon-inspector"
        },
        {
            "import_time": "2026-08-06T00:58:53.451787547Z",
            "modified_time": "2026-08-05T14:59:18Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "id": "GHSA-rr93-6qpg-mg6r",
            "sha256": "f702f291b4278d17fc004a321e2ff0af0a38c2a73e969a6e2ffc9b41f07ca714",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-statist-browser-typed-client-cardsmobile.events.promotest

Package

Name
tinkoff-statist-browser-typed-client-cardsmobile.events.promotest
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-statist-browser-typed-client-cardsmobile.events.promotest

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.8.7

Database specific

cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-SenlK1xY22XpK8ZhVFQPoUAaDLSg6+Q1HFVn0YqfV9krMuIqR+GUYhDR5dM+JWsHwGLjFnj2lg9T9u30kCmWNQ==",
                "sha1": "3d3b4e85947890dd8f30200034054aebde98f2d0"
            },
            "filename": "tinkoff-statist-browser-typed-client-cardsmobile.events.promotest-20.8.7.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_polyfill.js",
            "sha256": "9a70843203b17ff1f5c8a836225e487ea32b884d78001261c7d5edafaec275cf",
            "tlsh": "38a1bb9a1665711987b0dbe4c72b8416f65be363378082d4f79ca5981fb213483b2efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "2f595b42c2f744bfb5f89f198f211a3396030fc7f55e484625c71991a2c736cd",
            "tlsh": "73835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-cardsmobile.events.promotest/MAL-2026-12255.json"