MAL-2026-13070

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-mm-server-loader/MAL-2026-13070.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13070
Published
2026-08-05T14:27:36Z
Modified
2026-08-05T15:52:09.128226462Z
Summary
Malicious code in boxy-mm-server-loader (npm)
Details

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

Source: amazon-inspector (26c25489d15bfaaf8e337af2f2fa446e86fdc8cc5fae3199be2451bdb35196ef)

On require('boxy-mm-server-loader'), index.js loads polyfill.js, which fetches a platform-specific binary from one of three string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to /var/tmp/.cache<hex> on Unix or %TEMP%/dotnetdiag<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. A DNS TXT-record covert channel over c.<domain> / 0.<domain> / 1.<domain> against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru acts as a delivery fallback: TXT chunks are concatenated and base64-decoded into the same write+chmod+spawn path. Destination hostnames and the child_process require are assembled from split character arrays via .join(""); dropped artifacts use decoy names mimicking system telemetry (.cache<hex>, dotnetdiag<hex>.exe,.analyticsstate). No hash or signature verification is performed on the fetched bytes.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "26c25489d15bfaaf8e337af2f2fa446e86fdc8cc5fae3199be2451bdb35196ef",
            "id": "IN-MAL-2026-015309",
            "import_time": "2026-08-05T15:19:44.042426019Z",
            "modified_time": "2026-08-05T14:27:36Z",
            "source": "amazon-inspector",
            "versions": [
                "35.5.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-mm-server-loader

Package

Name
boxy-mm-server-loader
View open source insights on deps.dev
Purl
pkg:npm/boxy-mm-server-loader

Affected ranges

Affected versions

35.*
35.5.8

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-mm-server-loader/MAL-2026-13070.json"
indicators 
{
    "evidence_files": [
        {
            "sha256": "c29296b8c7c067a6e6dfda30b6e147e011d7192869bf97a4712287c556de846f",
            "tlsh": "0aa1b79a06a6701987b0dbe087174816f65ff6633380c284fb9c69985f7712483b2efc",
            "path": "_polyfill.js"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "500a103c2166d0ad860a66e9f83983b459e3a862",
                "sha512_sri": "sha512-95i+EO9qqAcVw7yIuS+hw++Vfo43eh7xiOZmKXD5iKQpxKtFhboZ9HDsUtk3fnOvNxjmQ0JUuVvp2lxPxDVL1w=="
            },
            "filename": "boxy-mm-server-loader-35.5.8.tgz"
        }
    ]
}