MAL-2026-12151

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-auth-interceptor/MAL-2026-12151.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12151
Published
2026-08-05T08:45:31Z
Modified
2026-08-05T10:05:53.867142439Z
Summary
Malicious code in bigops-auth-interceptor (npm)
Details

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

Source: amazon-inspector (018aa5e99b7e6aa9f438b51ee00164801a2eb1c52e78ad123d0c490dced4b67c)

On require() of bigops-auth-interceptor@35.7.2, index.js loads vendor.js which selects a platform-specific binary URL, downloads bytes over HTTPS from one of four string-concatenation-obfuscated Cloudflare Workers mirrors (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev), writes them to a temp path under a disguised name (dotnetdiag<hex>.exe on Windows,.cache<hex> on Linux), chmods 0755, and spawns the file detached via /bin/sh -c or cmd.exe. A DNS TXT-record fallback channel (c.<domain> returns a chunk count, then i.<domain> TXT records are concatenated and base64-decoded into the payload) is implemented against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, providing covert payload retrieval when HTTPS is blocked. A run-once marker file (.analytics_state) prevents repeated execution. Destination hosts are unrelated to any legitimate publisher of the package's stated purpose; the fetched bytes are unpinned, unsigned, and platform-selected.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-014404",
            "import_time": "2026-08-05T09:28:07.058275288Z",
            "versions": [
                "35.7.2"
            ],
            "modified_time": "2026-08-05T08:45:31Z",
            "sha256": "018aa5e99b7e6aa9f438b51ee00164801a2eb1c52e78ad123d0c490dced4b67c"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-auth-interceptor

Package

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

Affected ranges

Affected versions

35.*
35.7.2

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-auth-interceptor/MAL-2026-12151.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "evidence_files": [
        {
            "tlsh": "22a1865a156a70194bb0dbe48b1b541af65bf6533380c2d4fb6ca5981f731148372dfc",
            "sha256": "7d2e372f29a368fcf9fdf2007df55b3fe46a78c41109260433d43d91ad2d3655",
            "path": "_vendor.js"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "d6158fce1d3fb7ef31b4c18e746e1477f3ef701b",
                "sha512_sri": "sha512-p7oyDy3wU7hFk3JRf3nkDFBlW/CywfBxtLuck33yv4QmtGukvVw/t4enniwOqctR3s9wwjU+BQAxtoh2r5VTrQ=="
            },
            "filename": "bigops-auth-interceptor-35.7.2.tgz"
        }
    ]
}