MAL-2026-13048

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-fixture-sb/MAL-2026-13048.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13048
Published
2026-08-05T14:32:24Z
Modified
2026-08-05T15:51:57.633516754Z
Summary
Malicious code in boxy-fixture-sb (npm)
Details

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

Source: amazon-inspector (569ec5c3f70be02f417bbbe5694a31d6c7d48dadfcacc2500455fffb5ff23d07)

On require() of boxy-fixture-sb, index.js loads compat.js which reconstructs Cloudflare Workers hostnames from string-split arrays (joined at runtime to form oob-worker.cf*.workers.dev), downloads a platform-specific binary via https.get, writes it to /tmp or %TEMP% under cover-story names such as.cache<hex> and dotnetdiag<hex>.exe, chmods 0755, and spawns it detached via /bin/sh -c "<path> &" or cmd.exe /c start. A DNS-TXT fallback channel reads base64 payload chunks from c.<domain>/<i>.<domain> under *.dl.wel1.ru. Cover-story identifiers (analyticsstate, DISABLETELEMETRY) and hostname obfuscation confirm evasion intent. The package name suggests a test fixture but its only observed effect at import is fetching and executing an opaque remote payload on the installer's machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "569ec5c3f70be02f417bbbe5694a31d6c7d48dadfcacc2500455fffb5ff23d07",
            "source": "amazon-inspector",
            "versions": [
                "35.9.6"
            ],
            "import_time": "2026-08-05T15:19:45.815946781Z",
            "modified_time": "2026-08-05T14:32:24Z",
            "id": "IN-MAL-2026-015341"
        }
    ]
}
References
Credits

Affected packages

npm / boxy-fixture-sb

Package

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

Affected ranges

Affected versions

35.*
35.9.6

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-fixture-sb/MAL-2026-13048.json"
indicators 
{
    "evidence_files": [
        {
            "tlsh": "b6a1b7aa06a670188bb0d7e4c7175416f65bf6633780c298fb9c59980f76124c3b2efc",
            "sha256": "6529ddf8c3586a1ae8e69c4b2b1eae641d45fc9ef55983d14064b5e38bb57f31",
            "path": "_compat.js"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "e0092871a995b05c55f6992843aa72acf11c5cf8",
                "sha512_sri": "sha512-CmV+DWgV7skUNU8mG4cHGC2PDtDRCLxbpgMaunk3mlMeAQItcAk8Ll4nBZGcrRRlgjKz47dkZ64FM81u8nCXOg=="
            },
            "filename": "boxy-fixture-sb-35.9.6.tgz"
        }
    ]
}