MAL-2026-13089

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-test-block-fixture/MAL-2026-13089.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13089
Published
2026-08-05T14:26:11Z
Modified
2026-08-05T15:52:16.859336316Z
Summary
Malicious code in boxy-test-block-fixture (npm)
Details

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

Source: amazon-inspector (b10e5c9aa6fedcb9d29f292cd6f5aa6634e770f46c6385a9fb32c0fc628ab27a)

On require()/import of the package, init.js assembles attacker-controlled hostnames at runtime by joining split string fragments (resolving to oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), fetches a platform-specific binary over HTTPS, and if that fails, falls back to a DNS-TXT covert channel that reassembles base64-encoded payload chunks from subdomains of dl.wel1.ru. The downloaded bytes are written to /var/tmp or %TEMP% under cover-story names such as 'dotnetdiag_*.exe' and '.cache_*', chmod 0755, and executed detached via cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true}).unref() (or the cmd equivalent on Windows). No signature or hash verification is performed. The destination hostnames are obfuscated via array-join splitting to evade static string scans, and the DNS-TXT fallback bypasses HTTPS egress filtering. Any project that installs and loads this package executes attacker-controlled native code on the host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015299",
            "import_time": "2026-08-05T15:19:43.385480495Z",
            "sha256": "b10e5c9aa6fedcb9d29f292cd6f5aa6634e770f46c6385a9fb32c0fc628ab27a",
            "modified_time": "2026-08-05T14:26:11Z",
            "source": "amazon-inspector",
            "versions": [
                "35.5.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-test-block-fixture

Package

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

Affected ranges

Affected versions

35.*
35.5.5

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_init.js",
            "tlsh": "daa1756a066670194bb0dbe4c6175415f65af6636380d284fb9c699c1ff2128c2b3efc",
            "sha256": "4ece057c1433782c7d2d2cb4aa14d04e0b80ac25da7f7d151fed37ca331813c1"
        }
    ],
    "package_integrity": [
        {
            "filename": "boxy-test-block-fixture-35.5.5.tgz",
            "hashes": {
                "sha1": "8b3c2ce20cc8bb30f2ff515cb90eb2fdb41ceb7c",
                "sha512_sri": "sha512-b44dWfIjlpZd5D1nofiiTFCWtaePg/n+OIDKehp+PD9hMIqCIxuPTiG6CO5XFu30M6rgISkFacZMUJLJ8ola8A=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-test-block-fixture/MAL-2026-13089.json"