MAL-2026-13225

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-nitro-client/MAL-2026-13225.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13225
Published
2026-08-05T15:37:40Z
Modified
2026-08-05T16:50:00.935638334Z
Summary
Malicious code in bigops-nitro-client (npm)
Details

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

Source: amazon-inspector (bfbd116994566a3e99f61697a738787d8089c2c99dbc9d5c55f9f3902a6b8cff)

On require(), index.js loads vendor.js which downloads a platform-specific native binary from rotating Cloudflare Workers endpoints (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT chunked base64 fallback channel via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched binary is written to /tmp or %TEMP% under disguised names (dotnetdiag,.cache), chmod 0755, and spawned detached via spawn('/bin/sh', ['-c', <path> + ' &']) or spawn('cmd',...). Host names are assembled at runtime from split string arrays joined with.join('') to evade static host scanning. The package presents itself as a trivial stub client and has no legitimate need for a native binary download or execution.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015771",
            "modified_time": "2026-08-05T15:37:40Z",
            "versions": [
                "35.6.1"
            ],
            "sha256": "bfbd116994566a3e99f61697a738787d8089c2c99dbc9d5c55f9f3902a6b8cff",
            "import_time": "2026-08-05T16:13:43.357699057Z",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-nitro-client

Package

Name
bigops-nitro-client
View open source insights on deps.dev
Purl
pkg:npm/bigops-nitro-client

Affected ranges

Affected versions

35.*
35.6.1

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-nitro-client-35.6.1.tgz",
            "hashes": {
                "sha1": "c00357925840314f2fef65d2b239676d75c84c02",
                "sha512_sri": "sha512-sRmwtu6Qvo3XdutDZODSNbDUeY4GfYcek/PGWuIFv2h9UzCLKs2ST63v/AHJ+3VFbx/CUMEbpJbhw37gfU6nHA=="
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "14b1859a15b670198bb0d7f487175416f69ae6a33380c198fb5ca8981f7712483b2dfc",
            "sha256": "f364f460a233b86354de41818aa9bc0f39934cb14ed69ab0a00ad7dfc3a7978e",
            "path": "_vendor.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-nitro-client/MAL-2026-13225.json"