MAL-2026-13033

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-constants/MAL-2026-13033.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13033
Published
2026-08-05T14:35:06Z
Modified
2026-08-05T15:51:52.198204388Z
Summary
Malicious code in boxy-constants (npm)
Details

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

Source: amazon-inspector (de3d566208b48f775ec51e3308934813973ad0a6fef6cb98fd438042056bb9b0)

On require of the package, index.js loads shim.js which reconstructs attacker-controlled hostnames from split-string arrays (Cloudflare Workers subdomains such as oob-worker.cf100-41.6.workers.dev and *.dl.wel1.ru), selects an OS/arch-specific URL for linuxx64/linuxarm64/darwin/win32, fetches an unsigned, unhashed binary via https.get, writes it to /var/tmp/.cache<hex> on POSIX or %TEMP%\dotnetdiag<hex>.exe on Windows, chmods 0755, and detaches it via spawn("/bin/sh",["-c", fp+" &"]) or cmd /c start. A DNS-TXT base64 channel provides a fallback host-resolution path. A marker file '.analyticsstate' implements cooldown-based execution suppression, and a stealth logger writes empty strings to stderr. Decoy filenames (dotnetdiag_,.cache_) and 'analytics/telemetry' naming disguise the dropper. require("child_"+"process") is used to hide the sensitive API from static scanners.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T14:35:06Z",
            "sha256": "de3d566208b48f775ec51e3308934813973ad0a6fef6cb98fd438042056bb9b0",
            "versions": [
                "35.2.7"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-015359",
            "import_time": "2026-08-05T15:19:46.948399919Z"
        }
    ]
}
References
Credits

Affected packages

npm / boxy-constants

Package

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

Affected ranges

Affected versions

35.*
35.2.7

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-constants/MAL-2026-13033.json"
indicators 
{
    "evidence_files": [
        {
            "path": "_shim.js",
            "sha256": "e70e3e3f778d21127dcd0c1d9d907201c8758afe636c661877abea99650004be",
            "tlsh": "76a1999a126671184b70d7e487174816f65bf6633380c2d8f76ca9980f775288372efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "9d22416d6f13e18c4680db9590e99379878c7fc6",
                "sha512_sri": "sha512-x3XNZS6EvpMeV5Cd2l9/oEHWIEBoXq4wV+Kdg3XqKU9UtmxMg/yhShqHOlJVY+ZuDldvOZDILs2BQ3vnjz34QA=="
            },
            "filename": "boxy-constants-35.2.7.tgz"
        }
    ]
}