MAL-2026-13047

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-fixture-pfa/MAL-2026-13047.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13047
Published
2026-08-05T14:31:10Z
Modified
2026-08-05T15:51:57.329564519Z
Summary
Malicious code in boxy-fixture-pfa (npm)
Details

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

Source: amazon-inspector (0a15e41a397b63d04216419ddd8ec88f37cb68c5d35997ad840543e034f87d8f)

On require() of the package, polyfill.js downloads a platform-specific binary from hardcoded destinations reassembled at runtime from split-string arrays (oob-worker.cf1006.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev), writes it to /tmp under a hidden name (.cache<hex>) or to %TEMP%\dotnetdiag<hex>.exe on Windows, chmods it 0755, and spawns it detached via /bin/sh -c '<path> &' or cmd.exe /c start /b. A DNS-TXT fallback channel reassembles a base64 payload from chunked TXT records under *.dl.wel1.ru when HTTPS is blocked. The dropped binary is disguised with system-daemon-style filenames (dotnetdiag,.cache_,.analyticsstate) and the code carries opt-out checks on DISABLETELEMETRY / ANALYTICSOPTOUT / DONOTTRACK as cover framing. A second dropper module lib/telemetry.js (81 KB, labeled 'Analytics SDK') ships the same base64-decode -> filesystem write -> chmod 0755 -> cp.spawn('/bin/sh', ['-c', filePath + ' &']) chain with split-property-name obfuscation (child_'+'process, chmod'+'Sync); it is not referenced from index.js in this version but is present in the tarball as an alternate loader. Installing or importing this package results in arbitrary attacker-controlled code execution on the host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "0a15e41a397b63d04216419ddd8ec88f37cb68c5d35997ad840543e034f87d8f",
            "id": "IN-MAL-2026-015332",
            "modified_time": "2026-08-05T14:31:10Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T15:19:45.345446041Z",
            "versions": [
                "35.3.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-fixture-pfa

Package

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

Affected ranges

Affected versions

35.*
35.3.4

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "3b3661fb455d5fcf0ec76d1e6f6be3062f39a0dbbbe277621bf88550dbe572e3",
            "path": "_polyfill.js",
            "tlsh": "53a186a506a6301847b0dbe1c7075415f55af6633780d184fb9c69981fb3224c3b2efc"
        },
        {
            "sha256": "8644ced59ec7a435711e3f0e21b9d012ba3dc414ca667a0daa193e755a0afeb5",
            "path": "lib/telemetry.js",
            "tlsh": "62835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-3jZEBRH5b5YeV3WUPFfT/vkikQmONpQfIKxGa3wR7cHw3k0Liow0FRDVEs56JXaDakfZICUVX9Ezt40E5LmaMA==",
                "sha1": "beec5ca41eea219e7f143a4c49daa7a283fabfb9"
            },
            "filename": "boxy-fixture-pfa-35.3.4.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-fixture-pfa/MAL-2026-13047.json"