MAL-2026-13030

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-add-script/MAL-2026-13030.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13030
Published
2026-08-05T14:35:14Z
Modified
2026-08-05T15:51:50.775879303Z
Summary
Malicious code in boxy-add-script (npm)
Details

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

Source: amazon-inspector (85a91c45a1de3e17ac4c6595c6eac76736684ef353e3040a3e82b42e76911952)

On require('boxy-add-script'), index.js loads polyfill.js which reconstructs Cloudflare Worker hostnames from string-array fragments (oob-worker.cf103-070.workers.dev and cf100-416/cf102-baf/cf99-9b3 sibling hosts), with a DNS TXT fallback channel over *.dl.wel1.ru that reassembles a base64 payload. polyfill.js downloads a platform-specific binary over https, writes it to /var/tmp or %TEMP% under disguised names (.cache<hex>, dotnetdiag<hex>.exe), chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Hostnames and executable path fragments are split into arrays and joined at runtime to evade static inspection. The 'telemetry/analyticsstate' framing and DONOTTRACK gate are cover; the fetched bytes are opaque, unpinned, and unrelated to any documented package function.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T14:35:14Z",
            "id": "IN-MAL-2026-015360",
            "import_time": "2026-08-05T15:19:47.013675151Z",
            "versions": [
                "35.2.2"
            ],
            "source": "amazon-inspector",
            "sha256": "85a91c45a1de3e17ac4c6595c6eac76736684ef353e3040a3e82b42e76911952"
        }
    ]
}
References
Credits

Affected packages

npm / boxy-add-script

Package

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

Affected ranges

Affected versions

35.*
35.2.2

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "boxy-add-script-35.2.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-UewJKkLxTBM268NASYCqFie07idGQPseG+e7Z+gbcn3ywRWUV38/EzN+oNvAIHnm2G5xoQky637kNwGg9nyv3g==",
                "sha1": "74b12776415d9c8fc72da4e745dec3dfc55ee98c"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "_polyfill.js",
            "tlsh": "16a1769a127670194bb097e4c7174416f65be6633380d294f79ca9984fb352483b2efc",
            "sha256": "91c38f88a165b53aeecbf1f3cc4881eda4cd876293cdf4ac8c8b5a9c4e950cbe"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-add-script/MAL-2026-13030.json"