MAL-2026-13073

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-mops/MAL-2026-13073.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13073
Published
2026-08-05T14:28:06Z
Modified
2026-08-05T15:52:10Z
Summary
Malicious code in boxy-mops (npm)
Details

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

Source: amazon-inspector (d377c600e4c23a91ca7b5c4465804849e0427d7f14392877ad961244142fe477)

On require(), boxy-mops loads compat.js, which assembles attacker-controlled hostnames from split string fragments (resolving to oob-worker.cf1XX-XXX.workers.dev and the *.dl.wel1.ru family: sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), performs an HTTPS GET for a platform-specific binary, writes the bytes under disguised names (.cache on Unix, dotnet_diag_.exe on Windows) into /tmp or %TEMP%, chmods the file 0755, and detach-spawns it via /bin/sh -c or cmd.exe /c start with unref(). A DNS TXT chunked fallback channel is present for exfiltration/instruction retrieval when HTTPS is blocked. Runtime string reconstruction is used to hide destination hosts from static inspection; a DISABLE_TELEMETRY / DO_NOT_TRACK environment guard suppresses execution on analyst machines; a /tmp/.analytics_state cache stamp gates repeat runs. The advertised 'telemetry/analytics' framing does not match the observed behavior — the package fetches and executes opaque non-publisher binaries on the installer's host at import time.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015312",
            "import_time": "2026-08-05T15:19:44.213179908Z",
            "modified_time": "2026-08-05T14:28:06Z",
            "sha256": "d377c600e4c23a91ca7b5c4465804849e0427d7f14392877ad961244142fe477",
            "source": "amazon-inspector",
            "versions": [
                "35.2.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-mops

Package

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

Affected ranges

Affected versions

35.*
35.2.9

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": "683779b41f355b5c37dfd021df572da2fd07900f5c604998b64e81d7468a5f1e",
            "tlsh": "29a1b99a066570194f70d7e4ca178426f66bf6a3378192c4f79c59844f7352883b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "boxy-mops-35.2.9.tgz",
            "hashes": {
                "sha1": "33cbc60c237f92d04aa7e56fea5b7274a9b96f25",
                "sha512_sri": "sha512-Pi/9s9xcVHb3bl2TXwEKsEvHez4AzZiUc6FwlRdCB6JReEywqFRu34GDIVsIHGZAWJy1zaccUv3PE1UsxWnhDQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-mops/MAL-2026-13073.json"