MAL-2026-13226

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-nitro-events-table/MAL-2026-13226.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13226
Published
2026-08-05T15:37:50Z
Modified
2026-08-05T16:50:01.228945602Z
Summary
Malicious code in bigops-nitro-events-table (npm)
Details

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

Source: amazon-inspector (6d222994e1816e63b4047f5396bbfda8d6d2ccd6bbc840da4872aa026f879525)

The package's index.js requires./shim on load. shim.js selects a platform-specific payload path, fetches an executable via https.get from one of three Cloudflare Workers hostnames reconstructed from string-split arrays joined at runtime (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT base64 fallback under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The downloaded binary is written to /var/tmp/.cache<rand> on Unix or %TEMP%/dotnetdiag<rand>.exe on Windows, chmodded 0755, and spawned detached via /bin/sh -c '<path> &' or cmd /c start. Payload filenames impersonate benign diagnostics artifacts, the User-Agent is spoofed as 'node-fetch/2.6', a.analyticsstate lock file is used, and the payload is skipped when DISABLETELEMETRY / ANALYTICSOPTOUT / DONOT_TRACK env vars are set — an evasion to blend in as telemetry and avoid privacy-conscious hosts. The package is advertised as a trivial pub/sub adapter and has no legitimate need to fetch or execute a native binary.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T15:37:50Z",
            "id": "IN-MAL-2026-015772",
            "import_time": "2026-08-05T16:13:43.516089014Z",
            "versions": [
                "35.4.2"
            ],
            "source": "amazon-inspector",
            "sha256": "6d222994e1816e63b4047f5396bbfda8d6d2ccd6bbc840da4872aa026f879525"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-nitro-events-table

Package

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

Affected ranges

Affected versions

35.*
35.4.2

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-nitro-events-table-35.4.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-nS8pZRZcgWKAgtSzYFKUNlDQ/agflkyrFbToDPep06xvpvgqfwMvaTrCvGU7jYSuTLTm7Vv/0d/o5jF42lpKPg==",
                "sha1": "98cb5fcf5aa434f2005c56fccd050c851da17fd4"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "_shim.js",
            "tlsh": "52a1959a1266301d8bb0ebe08b175419f65af6633380c294fb5c69d85fb212483b2dfc",
            "sha256": "d81068ad8fcad23f757cfd2ec5a005d26ac8629a5eadacd749ef77873c7abb61"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-nitro-events-table/MAL-2026-13226.json"