MAL-2026-12242

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-fb-rf-add-application/MAL-2026-12242.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12242
Published
2026-08-05T09:00:35Z
Modified
2026-08-05T10:06:40.708355540Z
Summary
Malicious code in tinkoff-fb-rf-add-application (npm)
Details

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

Source: amazon-inspector (788686e9aacdc59ec40f42563a7d9ba5020c75d6c724c8bf59623213b51df780)

The package's main entry loads bootstrap.js on require(), which downloads a platform-specific executable from string-fragment-obfuscated Cloudflare-workers mirrors (assembled at runtime via array-join, e.g. oob-worker.cf*.workers.dev) with a DNS-TXT chunked base64 fallback under *.dl.well1.site (tin/tina/ldr/win subdomains). The fetched bytes are written to /tmp or %TEMP% under a disguised filename impersonating system binaries (dotnetdiag<tag>.exe on Windows,.cache<tag> on Unix), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. A lock file.analytics_state and telemetry-shaped env-var opt-outs provide a cover story. The C2 hostnames are constructed from split string fragments to evade static analysis.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014506",
            "import_time": "2026-08-05T09:28:19.92624529Z",
            "sha256": "788686e9aacdc59ec40f42563a7d9ba5020c75d6c724c8bf59623213b51df780",
            "modified_time": "2026-08-05T09:00:35Z",
            "versions": [
                "20.3.5"
            ],
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-fb-rf-add-application

Package

Name
tinkoff-fb-rf-add-application
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-fb-rf-add-application

Affected ranges

Affected versions

20.*
20.3.5

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-JE2L3YlWbL4fasvq18+sAlyyUBKtlvi2+2GoGtrlgV4p4ndZ0OoJZps7e/nklP4ay++vh7KAWQBaURyufWp4Qw==",
                "sha1": "ddc8f3b353fec5b1d92c75e42acd130a587384a3"
            },
            "filename": "tinkoff-fb-rf-add-application-20.3.5.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_bootstrap.js",
            "sha256": "fa2c38347cd5f93c269af5371d197248a40fa48caec63e5fe98fcfc712b3cb4b",
            "tlsh": "29a1966e156630294bb09be48717481afa5af6537380c294fb5ca5945f72224c3b1efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-fb-rf-add-application/MAL-2026-12242.json"