MAL-2026-13233

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-procedure-file-handlers/MAL-2026-13233.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13233
Published
2026-08-05T15:36:25Z
Modified
2026-08-05T16:50:04Z
Summary
Malicious code in bigops-procedure-file-handlers (npm)
Details

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

Source: amazon-inspector (0c15f49a67f4aa7071f4143a57c729f98dae58b01eb58ac77aabc666f1a1dda0)

On require of the package, runtime.js downloads a platform-specific executable from obfuscated Cloudflare Workers endpoints (hostnames reassembled at runtime via array-join, e.g. oob-worker.cf99-9b3.workers.dev and sibling cf101/cf103/cf100 workers), writes it to /tmp or %TEMP% under a cover-story filename (dotnet_diag.exe on Windows,.cache_ on Unix), chmods it to 0755, and detached-spawns it via /bin/sh -c or cmd.exe /c start /b. If HTTPS delivery fails, a fallback path queries DNS TXT records at subdomains of *.dl.wel1.ru, reads a chunk count from c., reassembles base64 chunks from N. TXT records, and executes the resulting buffer. A stamp file.analytics_state is written to disguise the drop as OS/telemetry state. The obfuscation of destinations, covert DNS-TXT delivery channel, and disguised filenames indicate intentional evasion rather than legitimate telemetry or binary distribution.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015763",
            "import_time": "2026-08-05T16:13:42.564252315Z",
            "modified_time": "2026-08-05T15:36:25Z",
            "sha256": "0c15f49a67f4aa7071f4143a57c729f98dae58b01eb58ac77aabc666f1a1dda0",
            "source": "amazon-inspector",
            "versions": [
                "35.7.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-procedure-file-handlers

Package

Name
bigops-procedure-file-handlers
View open source insights on deps.dev
Purl
pkg:npm/bigops-procedure-file-handlers

Affected ranges

Affected versions

35.*
35.7.6

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_runtime.js",
            "sha256": "145183f88f7d8a83879a975d2906baf0019f8aba518b92586cab36cb87dec22e",
            "tlsh": "b5a197aa156770198bb097e4c71b5416f65bf6a33780c2d8fb9c65881f7212483b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bigops-procedure-file-handlers-35.7.6.tgz",
            "hashes": {
                "sha1": "fd25a530aa0a6fb37ef0064bcc4ca5687d4b357f",
                "sha512_sri": "sha512-myR5dT34HMKmbIfgWCT9PbUnmSGf1p6btFkoL1baX61h9bdCVkKbPZeQLfCw3lKtyjE0SK0ucbBENtUfNzD0Iw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-procedure-file-handlers/MAL-2026-13233.json"