MAL-2026-13494

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-telephony-mock/MAL-2026-13494.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13494
Published
2026-08-07T12:11:49Z
Modified
2026-08-07T12:35:26.350888764Z
Summary
Malicious code in bigops-telephony-mock (npm)
Details

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

Source: amazon-inspector (ccbd56ae20f9cc922c12df25456654a649c9bbc963aae4fa95e027f97628c45b)

Requiring the package (index.js ->./setup) triggers setup.js, which reconstructs destination hostnames from split string fragments (e.g. oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT fallback across sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, downloads a platform-specific binary via https.get, writes it to a disguised path under /tmp or %TEMP% (names such as analyticsstate, dotnetdiag_*.exe,.cache_*), fs.chmodSync's it to 0755, and cp.spawn's it detached via /bin/sh -c '<file> &' or cmd.exe /c start /b. No version pin, no hash or signature verification, and destinations are assembled at runtime to defeat static inspection; childprocess itself is required as "child" + "process" in lib/telemetry.js. A second copy of the same download->base64-decode->chmod 755->spawn /bin/sh loader is bundled under lib/telemetry.js (approximately 81KB) framed as a telemetry SDK. The behavior fires on any require()/import of the package, gated only by an opt-out env var and a TTL marker file, so a normal npm install followed by loading the module causes attacker-controlled code to execute on the installer's machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-07T12:11:49Z",
            "sha256": "ccbd56ae20f9cc922c12df25456654a649c9bbc963aae4fa95e027f97628c45b",
            "import_time": "2026-08-07T12:23:25.447470807Z",
            "id": "IN-MAL-2026-016878",
            "versions": [
                "35.7.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-telephony-mock

Package

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

Affected ranges

Affected versions

35.*
35.7.2

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-telephony-mock-35.7.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-pYwY8e7fOrRPQdrcHtxHpeauaR0uI9cDP0BwZdDAmfP5tPxkmSUy8pwZh+Ncy29Awv6AsY2MvLTFkA2IufFCyg==",
                "sha1": "0598b325f3496cb29ab1f535148f4f4601cd27f9"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "9aa1a79a1266b1188fb0abe4c71b8816f61bf2a33781c284fb5c65845f735148372efc",
            "sha256": "354e3b3034f3f0752ffdbfeae03cfb6da5938b19b54f751cfc3f192aeb580a35",
            "path": "setup.js"
        },
        {
            "tlsh": "5e835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "7f71a0f07b9f72570746aaacb191fb3d313fa373cef63b3ad65266b6d3aa49e4",
            "path": "lib/telemetry.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-telephony-mock/MAL-2026-13494.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]