MAL-2026-13022

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-utils/MAL-2026-13022.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13022
Published
2026-08-05T14:34:58Z
Modified
2026-08-05T15:51:46Z
Summary
Malicious code in bnpl-blocks-utils (npm)
Details

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

Source: amazon-inspector (370e12396e25d7b72ad12f12c31c986e976bd8341f5fa61baa8cd3bb469f968e)

On require(), index.js loads loader.js, which assembles a Cloudflare Workers hostname (oob-worker.cf*.workers.dev) via runtime.join('') string reassembly, fetches a platform-specific binary via https.get, writes it to /tmp or %TEMP% under a disguised name (dotnet_diag.exe on Windows,.cache_ on Linux/macOS), chmods 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp + ' &']) or spawn('cmd',...). If the HTTPS fetch fails, _loader.js falls back to a DNS-TXT covert channel: it resolves TXT records on subdomains of dl.wel1.ru (host fragments also assembled via.join('')), concatenates the returned chunks, base64-decodes them, writes the resulting bytes as an executable, and spawns it. There is no hash or signature verification of the fetched payload. The package presents itself as a generic 'utility functions' library; the remote-binary-drop behavior does not match that stated purpose. Multiple structural fingerprints stack: runtime-obfuscated attacker-controlled hostnames, unpinned mutable payload URLs, DNS-TXT payload staging (a network-egress evasion channel), disguised filenames in system temp directories, and detached execution triggered at module load.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015358",
            "import_time": "2026-08-05T15:19:46.903611577Z",
            "modified_time": "2026-08-05T14:34:58Z",
            "sha256": "370e12396e25d7b72ad12f12c31c986e976bd8341f5fa61baa8cd3bb469f968e",
            "source": "amazon-inspector",
            "versions": [
                "35.7.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-utils

Package

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

Affected ranges

Affected versions

35.*
35.7.1

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_loader.js",
            "sha256": "d1319417df63b80a2193dec32f80719205eceec495cb40fafceb7f59ba1e4fd6",
            "tlsh": "95a1b65a176a71184bb0abe4c71b5415f51af6633781c684fa8c69c81f7212483b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bnpl-blocks-utils-35.7.1.tgz",
            "hashes": {
                "sha1": "41f5c1a491262d427eb74ba644d1a4c0449447a8",
                "sha512_sri": "sha512-d0wshM1iLISXeqeG4Th341FHlkzC77EHAK1kREIuU57WBHt2YDOiV88chTDlZU7SalcA2ooLk0ikk2g0Vtw/bg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-utils/MAL-2026-13022.json"