MAL-2026-12248

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-pfp-block-mobile-advert-footer/MAL-2026-12248.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12248
Aliases
  • GHSA-j4mw-2cmq-xhcq
Published
2026-08-05T08:58:10Z
Modified
2026-08-06T01:21:32.224508684Z
Summary
Malicious code in tinkoff-pfp-block-mobile-advert-footer (npm)
Details

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

Source: amazon-inspector (12bd549b3c3a286caedd91cb1bbc6052850f23c01f5eaa33e7c336db1928258c)

On require() of index.js, the package silently loads bootstrap.js, which reconstructs attacker-controlled hostnames from split-string fragments (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, with a DNS-TXT base64 fallback via subdomains of dl.well1.site) and downloads an unsigned platform-specific binary over HTTPS. The binary is written to /var/tmp/.cache<rand> on Unix or %TEMP%/dotnetdiag<rand>.exe on Windows (a masquerade as a.NET diagnostic tool), chmod 0755, and detached-spawned via /bin/sh -c or cmd /c start. Re-execution is throttled by a state file (/tmp/.analyticsstate or %TEMP%/analyticsstate) checked against a MAX_AGE window. The package name impersonates Tinkoff internal tooling; the only functional code beyond a stub API surface is the dropper. Host reconstruction via array joins and the DNS-TXT payload transport are anti-analysis evasion.

Source: ghsa-malware (fd67cad8ecac96684a8df48d315f1b4e3945b7c34244b40c9cfa32112f244683)

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": [
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-05T08:58:10Z",
            "sha256": "12bd549b3c3a286caedd91cb1bbc6052850f23c01f5eaa33e7c336db1928258c",
            "id": "IN-MAL-2026-014491",
            "versions": [
                "20.3.3"
            ],
            "import_time": "2026-08-05T09:28:18.176925191Z"
        },
        {
            "import_time": "2026-08-06T00:58:53.394389332Z",
            "sha256": "fd67cad8ecac96684a8df48d315f1b4e3945b7c34244b40c9cfa32112f244683",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "id": "GHSA-j4mw-2cmq-xhcq",
            "modified_time": "2026-08-05T18:47:15Z",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-pfp-block-mobile-advert-footer

Package

Name
tinkoff-pfp-block-mobile-advert-footer
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-pfp-block-mobile-advert-footer

Affected ranges

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

Affected versions

20.*
20.3.3

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-l81SeXXOMWuPhzi/nTw8ql0GkDSEMJTMNPB1h5J7m+HLT8kAd1KmmcM0pAe85uDuhPuRX6mEz07OIyztTRHQaw==",
                "sha1": "f2133cb6ba7b793b89d8c84d42e4eaec244dbd5a"
            },
            "filename": "tinkoff-pfp-block-mobile-advert-footer-20.3.3.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_bootstrap.js",
            "sha256": "f1fb984ceec017cc4dd1af38193c02a836dffb31561d2946e27f24d71951949a",
            "tlsh": "28a1b79a16a970194bb0dbe4ca174416f65bf6633390c2c4fb5ca9985f72124c3b2efc"
        },
        {
            "path": "index.js",
            "sha256": "b9dccaa6b190483c571c2cd1393c27fc7afd517f45a81be50d760fc5c49824c6",
            "tlsh": "25f02d9665deb853c2f067e2de620046f76284744a4740647ac850db1ea981412a9df9"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-pfp-block-mobile-advert-footer/MAL-2026-12248.json"