MAL-2026-12169

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-header-tabs/MAL-2026-12169.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12169
Published
2026-08-05T08:44:44Z
Modified
2026-08-05T10:06:02.998983634Z
Summary
Malicious code in bigops-header-tabs (npm)
Details

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

Source: amazon-inspector (a0701359abf624183b03e0c8f4ca925a7b494923a581f943fa2f97f26d506b2e)

On require() of bigops-header-tabs, index.js loads adapter.js which selects a platform-specific remote path and fetches an opaque binary from obfuscated Cloudflare Workers hosts (hostnames reconstructed by string-join, e.g. "oob-worker.cf10"+"2-baf.workers.dev"), with a DNS-TXT-record-based staged retrieval fallback via subdomains of dl.wel1.ru (c.<domain> for chunk count, i.<domain> for base64 chunks). The fetched payload is written to /tmp or %TEMP% under masquerading names (dotnetdiag_,.cache_, analytics_state), chmod 0755 on Unix, and spawned detached via /bin/sh -c or cmd.exe. Execution is gated by env-var opt-outs and a stamp file to run once per host. The package README advertises only a trivial "header tabs" SDK, which does not require any native binary or child-process execution. Fingerprints present: hardcoded/reconstructed attacker C2 bound to install-time-reachable network+exec, obfuscated destination hostnames, DNS covert channel, filename masquerade, purpose mismatch between advertised functionality and shipped behavior.

Database specific 
{
    "malicious-packages-origins": [
        {
            "versions": [
                "35.8.2"
            ],
            "id": "IN-MAL-2026-014399",
            "import_time": "2026-08-05T09:28:06.448805867Z",
            "modified_time": "2026-08-05T08:44:44Z",
            "source": "amazon-inspector",
            "sha256": "a0701359abf624183b03e0c8f4ca925a7b494923a581f943fa2f97f26d506b2e"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-header-tabs

Package

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

Affected ranges

Affected versions

35.*
35.8.2

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": [
        {
            "hashes": {
                "sha512_sri": "sha512-kvI9Irvbz7UzUGkr1OpCLNgeNyRnO9kEM6mEMeLGwolbufEtIOsKBLX5skUI/x/LpgeZ+6edHSTQnwHnV+X4Xw==",
                "sha1": "9acf105504d44970c8dcbafc687fce20bd5f1b9a"
            },
            "filename": "bigops-header-tabs-35.8.2.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_adapter.js",
            "tlsh": "99a1b89a16a570088bb0e7e0c61b4826f66bf66336c0d5d4f79c65984f7352483b2efc",
            "sha256": "1a6957482a02a0bc7ee84c8d8c6cb66de66a056b12c7bc91643c3beb88cdf550"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-header-tabs/MAL-2026-12169.json"