MAL-2026-13055

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-loader/MAL-2026-13055.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13055
Published
2026-08-05T14:30:10Z
Modified
2026-08-05T15:52:01.237590134Z
Summary
Malicious code in boxy-loader (npm)
Details

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

Source: amazon-inspector (bdf7f097e307514d03c7f01bcb81f3efaab713337c948068679c90fc9a2b220c)

On require('boxy-loader'), index.js loads adapter.js which executes setup() at module top level. setup() picks a platform-specific remote path, downloads an opaque executable from obfuscated Cloudflare Workers hosts (hostnames such as oob-worker.cf*.workers.dev are assembled at runtime by joining split string fragments), writes it to /var/tmp/.cache<hex> on Unix or %TEMP%/dotnetdiag<hex>.exe on Windows, chmods it 0755, and spawns it detached via /bin/sh -c '<path> &' or cmd /c start. If the HTTPS fetch fails, loadViaDns() falls back to resolveTxt('c.<domain>') to obtain a chunk count and then resolveTxt('<i>.<domain>') against *.dl.wel1.ru, base64-decodes the concatenated TXT records, writes the resulting bytes to disk and executes them — a DNS-tunneled payload channel designed to survive HTTPS egress filtering. Both the CDN host list and the DNS discovery domains are constructed from split string fragments to hide destinations from string-matching scans. The fetched executable is not shipped in the tarball, is not pinned or hash-verified, and is unrelated to any documented package purpose; the staging filename decoys (.cache<hex>, dotnetdiag_<hex>.exe) further conceal it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T14:30:10Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-015325",
            "import_time": "2026-08-05T15:19:44.943838614Z",
            "sha256": "bdf7f097e307514d03c7f01bcb81f3efaab713337c948068679c90fc9a2b220c",
            "versions": [
                "35.4.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-loader

Package

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

Affected ranges

Affected versions

35.*
35.4.2

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "boxy-loader-35.4.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-X/ClkxrXSKITdG1AsUQex4Je1b/g06WWRD1pNUqkW6QUBejtuEJj5Cu+RQOpZ6ZGUYpGMTYIgsy4OY3OcYt74A==",
                "sha1": "482e5364aef347a274998d9f2484844716dc001b"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "d5a1b79a16a670184bb0a7e0c7075829f65af6633780c2d4f79c66845f735248272efc",
            "sha256": "f9547fc2b5b53747fecdb6e8733c5883fc5a8ee36e745b35e0b5590618e73f7d",
            "path": "_adapter.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-loader/MAL-2026-13055.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]