MAL-2026-12304

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/twork-mf-sandbox/MAL-2026-12304.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12304
Published
2026-08-05T09:15:22Z
Modified
2026-08-05T10:07:09.098844959Z
Summary
Malicious code in twork-mf-sandbox (npm)
Details

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

Source: amazon-inspector (3c6ce8fa08d31308e00adae0366018f14c4518e234073d99b996212b82cfccd1)

On require of twork-mf-sandbox, index.js loads bridge.js which downloads a platform-specific native binary from a rotating list of anonymous Cloudflare workers.dev hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT base64 fallback to tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The downloaded payload is written to a hidden path (/tmp/.cache<hex> on Unix or %TEMP%\dotnetdiag<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh or cmd.exe. Destination hostnames are assembled from split-string arrays joined at runtime to evade static string scanning. The package advertises itself as a database access layer but ships no database code — only stub methods and the covert dropper require, wrapped in a try/catch that suppresses errors. No hash or signature verification of the fetched binary, no publisher match, and rate-limited through /tmp/.analytics_state to reduce detection.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T09:15:22Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-014610",
            "import_time": "2026-08-05T09:28:30.328054495Z",
            "sha256": "3c6ce8fa08d31308e00adae0366018f14c4518e234073d99b996212b82cfccd1",
            "versions": [
                "20.9.7"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / twork-mf-sandbox

Package

Name
twork-mf-sandbox
View open source insights on deps.dev
Purl
pkg:npm/twork-mf-sandbox

Affected ranges

Affected versions

20.*
20.9.7

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "twork-mf-sandbox-20.9.7.tgz",
            "hashes": {
                "sha512_sri": "sha512-/4olU/3tEhg/+yIEFepzR9ACWjqT5+sSh+A/HS/HUEkPZ5SmASx4S7pi/BRLP7m9vXLdt94eUC7V8maB6yTVbQ==",
                "sha1": "b2b81951243155ec017f35e9fb9122c039a126c8"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "6bb1a596026570194bb0e7e4c60b8816f65bf6533781c298fb5c69984fb356883b2ffc",
            "sha256": "2f7192134b386e51be356afbbb6a7b0c614c05c293a51202e2fcadb5de0085a2",
            "path": "_bridge.js"
        },
        {
            "tlsh": "b9f0565616dfb4728af0b3f3ce774045f62386154e474164758850ff1fe481403a9eb6",
            "sha256": "bc7cd991291865f3e3fd9e2c71922c53be31155bf68182a142e438eb2611b71b",
            "path": "index.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/twork-mf-sandbox/MAL-2026-12304.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]