MAL-2026-12981

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-mobile-bnpl-button-set/MAL-2026-12981.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12981
Published
2026-08-05T14:40:20Z
Modified
2026-08-05T15:51:27.190411201Z
Summary
Malicious code in bnpl-blocks-mobile-bnpl-button-set (npm)
Details

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

Source: amazon-inspector (d860ca2d011c1e76bfee65b763f4a2d612dfad059ebbde41bb8cb79bc5680808)

On require() of the package, init.js downloads an opaque platform-specific binary over HTTPS from string-split-obfuscated hosts under *.workers.dev (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT covert-channel fallback that reads chunked base64 payload from c./0../N. subdomains of sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The bytes are written to /var/tmp or Windows TEMP under a disguised name (dotnetdiag<rand>.exe,.cache<rand>), chmodded 0755, and detached-spawned via /bin/sh -c or cmd.exe. Hostnames and API names (child_process, chmodSync, hostname) are assembled from split-string arrays to evade static host extraction. A cooldown stampfile and opt-out env vars gate re-execution. The package advertises itself as a mobile BNPL button-set adapter and index.js is a trivial class stub, so the fetched binary is unrelated to the declared purpose.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "d860ca2d011c1e76bfee65b763f4a2d612dfad059ebbde41bb8cb79bc5680808",
            "source": "amazon-inspector",
            "versions": [
                "35.6.5"
            ],
            "import_time": "2026-08-05T15:19:48.982409679Z",
            "modified_time": "2026-08-05T14:40:20Z",
            "id": "IN-MAL-2026-015394"
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-mobile-bnpl-button-set

Package

Name
bnpl-blocks-mobile-bnpl-button-set
View open source insights on deps.dev
Purl
pkg:npm/bnpl-blocks-mobile-bnpl-button-set

Affected ranges

Affected versions

35.*
35.6.5

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "4cee3254435e54c5789d8981aa43567e362df58d",
                "sha512_sri": "sha512-ZRldNu4kRhyWvxwEHTSp3Q9xF2ssXR2y34fWKvinNUsP6ZTuHLNvaS9Y47TK2j42M+Wn2+UnVybVuzo9vGmesQ=="
            },
            "filename": "bnpl-blocks-mobile-bnpl-button-set-35.6.5.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_init.js",
            "sha256": "7f51864bc4de2b7240ef1f10259898994cd85a2a346e848c6875a24035690795",
            "tlsh": "85a18596166a70184bb09be4c717442af95bf56337809294fb9c69981f7213483f2efc"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-mobile-bnpl-button-set/MAL-2026-12981.json"