MAL-2026-12771

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-module/MAL-2026-12771.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12771
Published
2026-08-05T13:42:39Z
Modified
2026-08-05T14:37:04.092911510Z
Summary
Malicious code in devplatform-spa-plugin-module (npm)
Details

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

Source: amazon-inspector (638c4246220ea7f9a595c145c76940e7e060920ef251ab2c67ca814b9ab93378)

On require of the package's main entry, polyfill.js executes init() which reconstructs destination hostnames via array-join string splits (e.g. ["oob-worke","r.cf100-416.worker","s.","dev"].join("")), selects a platform-specific endpoint, downloads an opaque binary via https.get from one of several Cloudflare Workers subdomains (oob-worker.cf100-416.workers.dev, cf101-adf, cf102-baf, cf103-070.workers.dev), writes the payload to /tmp or %TEMP% under a disguised name (.cache<hex> on Unix, dotnetdiag<hex>.exe on Windows), chmods it 0755, and spawns it detached via spawn("/bin/sh",["-c",fp+" &"],{detached:true,stdio:"ignore"}).unref() or spawn("cmd",...). If HTTPS retrieval fails, a fallback path resolves TXT records at c.<discovery-domain> and iteratively at N.<discovery-domain> under *.dl.wel1.ru (sdk/ext/pkg/net subdomains), base64-concatenates the chunks, and treats the result as the executable payload. Host reconstruction, disguised file names, staging in temp directories, detached execution, and a DNS TXT covert-channel fallback together constitute a fully productionized install-time dropper delivering arbitrary attacker code to any machine that installs or requires this package.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T13:42:39Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-015008",
            "import_time": "2026-08-05T14:19:52.115976044Z",
            "sha256": "638c4246220ea7f9a595c145c76940e7e060920ef251ab2c67ca814b9ab93378",
            "versions": [
                "35.7.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-spa-plugin-module

Package

Name
devplatform-spa-plugin-module
View open source insights on deps.dev
Purl
pkg:npm/devplatform-spa-plugin-module

Affected ranges

Affected versions

35.*
35.7.9

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-module/MAL-2026-12771.json"
indicators 
{
    "package_integrity": [
        {
            "filename": "devplatform-spa-plugin-module-35.7.9.tgz",
            "hashes": {
                "sha512_sri": "sha512-L4awH0vivpvrs8JBFIhHJiz50nblsi67n+0UZUIlOnoQ65RmB8wshocLEZxu61B41bSqxYfktlxUQqX8Ti9g+g==",
                "sha1": "beeb2c0c251b536d8145e2d0373c8e0656c02318"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "e7a1a76612a670084bb09be4c71b4816f65af6633781c1c4fb5c65945f731248372efc",
            "sha256": "0a4c3a06201873689403c0c12b5cfee92242b73e209f042d70eebfd5f2d2313e",
            "path": "_polyfill.js"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]