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
2026-08-05T15:51:57Z
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 and dotnet_diag_.exe, chmods 0755, and spawns it detached via /bin/sh -c " &" or cmd.exe /c start. A DNS-TXT fallback channel reads base64 payload chunks from c./. under *.dl.wel1.ru. Cover-story identifiers (analytics_state, DISABLE_TELEMETRY) 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":  [
        {
            "id":  "IN-MAL-2026-015341",
            "import_time":  "2026-08-05T15:19:45.815946781Z",
            "modified_time":  "2026-08-05T14:32:24Z",
            "sha256":  "569ec5c3f70be02f417bbbe5694a31d6c7d48dadfcacc2500455fffb5ff23d07",
            "source":  "amazon-inspector",
            "versions":  [
                "35.9.6"
            ]
        }
    ]
}
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",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "_compat.js",
            "sha256":  "6529ddf8c3586a1ae8e69c4b2b1eae641d45fc9ef55983d14064b5e38bb57f31",
            "tlsh":  "b6a1b7aa06a670188bb0d7e4c7175416f65bf6633780c298fb9c59980f76124c3b2efc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "boxy-fixture-sb-35.9.6.tgz",
            "hashes":  {
                "sha1":  "e0092871a995b05c55f6992843aa72acf11c5cf8",
                "sha512_sri":  "sha512-CmV+DWgV7skUNU8mG4cHGC2PDtDRCLxbpgMaunk3mlMeAQItcAk8Ll4nBZGcrRRlgjKz47dkZ64FM81u8nCXOg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-fixture-sb/MAL-2026-13048.json"