MAL-2026-13081

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-semver/MAL-2026-13081.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13081
Published
2026-08-05T14:24:51Z
Modified
2026-08-05T15:52:13Z
Summary
Malicious code in boxy-semver (npm)
Details

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

Source: amazon-inspector (dec5b3e90530b4252cc04b1cf4cf70ec0113fa36f307ef33b28c80ff72ebdc83)

index.js unconditionally requires./init on load. init.js downloads a platform-specific binary over HTTPS from hardcoded Cloudflare Workers hosts assembled by split-string concatenation (oob-worker.cf99-9b3.workers.dev), with a DNS-TXT fallback resolver at sdk.dl.wel1.ru, writes the payload to /var/tmp/.cache or %TEMP%\dotnet_diag.exe, chmods it 0755, and spawns it detached via /bin/sh -c or cmd /c start. Hostnames, the require("child_process") call, and fs.chmodSync are string-concatenated to evade static matching, and DISABLE_TELEMETRY/DO_NOT_TRACK checks are used as a benign cover story. A second module lib/telemetry.js (~81KB, not reached from the current index.js but shipped in the tarball) contains the same base64-chunk-assembly, chmod 755, and cp.spawn('/bin/sh',['-c', filePath+' &']) dropper primitives. Executable filenames mimicking dotnet diagnostics and hidden.cache paths, plus the DNS-TXT covert channel, indicate a purpose-built malware carrier rather than a semver utility.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015290",
            "import_time":  "2026-08-05T15:19:42.856214007Z",
            "modified_time":  "2026-08-05T14:24:51Z",
            "sha256":  "dec5b3e90530b4252cc04b1cf4cf70ec0113fa36f307ef33b28c80ff72ebdc83",
            "source":  "amazon-inspector",
            "versions":  [
                "35.3.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-semver

Package

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

Affected ranges

Affected versions

35.*
35.3.5

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":  "_init.js",
            "sha256":  "c399a8d9b9aa39fea8f4f8e7a16c1b116125f3959f12c385a966f9176af57c1a",
            "tlsh":  "02a1b79a176570088bb09be4872b5415f65be26337c0d294ff5ca5981f7712483b2efc"
        },
        {
            "path":  "lib/telemetry.js",
            "sha256":  "24e8899de1701bb85d1a0eb765c509e63920abe9b7341d496ab1a1d9376c1222",
            "tlsh":  "9b835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "boxy-semver-35.3.5.tgz",
            "hashes":  {
                "sha1":  "de09bb4ce9c08745b335ca4474e902c285e05e58",
                "sha512_sri":  "sha512-EmdT8ituxqE2cX38RnIKYMRRC82+NmoYwuOzVOWl57mSaqkp0hgHwYbbj1v3NgQ2TlTk30MPfQhP/aL1jpil0A=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-semver/MAL-2026-13081.json"