MAL-2026-13043

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-expander-contract/MAL-2026-13043.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13043
Published
2026-08-05T14:32:48Z
Modified
2026-08-05T15:51:56Z
Summary
Malicious code in boxy-expander-contract (npm)
Details

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

Source: amazon-inspector (d1f5856de3b0385535e80e5ef85627ecb7a087132c82c5d5457b35b62b9eaf72)

On require() of this package, index.js loads./runtime.js which assembles Cloudflare Workers hostnames via string-split.join('') fragments (e.g. oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT fallback under *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), downloads a platform-specific binary via https.get, writes it to /tmp or %TEMP% under a name masquerading as system tooling (dotnet_diag.exe,.cache_), chmods 755 on unix, and spawns it detached via spawn('/bin/sh', ['-c',...]) or spawn('cmd',...). No hash or signature verification is performed and destination hosts are string-fragmented to evade static analysis. The package's advertised API is an unrelated decoy stub.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015344",
            "import_time": "2026-08-05T15:19:45.992005532Z",
            "modified_time": "2026-08-05T14:32:48Z",
            "sha256": "d1f5856de3b0385535e80e5ef85627ecb7a087132c82c5d5457b35b62b9eaf72",
            "source": "amazon-inspector",
            "versions": [
                "35.5.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-expander-contract

Package

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

Affected ranges

Affected versions

35.*
35.5.3

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": "_runtime.js",
            "sha256": "b22506f9a48dbac4c97f0479d42c1fc6fdb4b6b1947940fdb75d1069db617979",
            "tlsh": "94b1775a165670194fb0a7e0c61b8416f65bf5633681c2c4f75c69845f73528c3b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "boxy-expander-contract-35.5.3.tgz",
            "hashes": {
                "sha1": "2b1f3947d67c053e7c32d04747595b1eb239e93f",
                "sha512_sri": "sha512-a0dXVu5Nt8+nsqyYgrYj1D9/d249tkldhgW1CUSL7MiYHxmTKXowdZdPLTvYAgeJbedSJNq9L2bKyfRzmjyDRA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-expander-contract/MAL-2026-13043.json"