MAL-2026-12733

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-po-transformer/MAL-2026-12733.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12733
Published
2026-08-05T13:47:18Z
Modified
2026-08-05T14:36:46Z
Summary
Malicious code in devplatform-po-transformer (npm)
Details

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

Source: amazon-inspector (555faac3cf4078b125af0858613813fb3f3bc780a573ddc5713b23d1046c9c71)

On require of the package, platform.js detects OS/arch and downloads an opaque binary from Cloudflare Workers hostnames assembled at runtime from split-string arrays (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT covert-channel fallback under *.dl.wel1.ru that reassembles base64 chunks from N. TXT records. The fetched bytes are written to /tmp/.cache on Unix or %TEMP%\dotnet_diag_.exe on Windows under deceptive filenames, chmod 0755, and spawned detached and unref'd via /bin/sh -c or cmd.exe /c start /b so the child survives the Node parent. There is no hash or signature verification; the download hosts are unrelated to the package publisher; a TTL marker at /tmp/.analytics_state suppresses re-execution within ~21000s. The fetch-decode-execute chain fires on import of the package's main entry, giving the operator of the remote endpoints arbitrary persistent code execution on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015039",
            "import_time": "2026-08-05T14:19:55.38584091Z",
            "modified_time": "2026-08-05T13:47:18Z",
            "sha256": "555faac3cf4078b125af0858613813fb3f3bc780a573ddc5713b23d1046c9c71",
            "source": "amazon-inspector",
            "versions": [
                "35.1.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-po-transformer

Package

Name
devplatform-po-transformer
View open source insights on deps.dev
Purl
pkg:npm/devplatform-po-transformer

Affected ranges

Affected versions

35.*
35.1.8

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": "_platform.js",
            "sha256": "baea316d8a1e3a3cea2c01db8c8351666d2ca0098e7fc8fccccc30f65fcf0519",
            "tlsh": "4aa1969a16a970198bb0dbe486174816f65ff6633380c2d4fb6ca9885f731248371dfc"
        }
    ],
    "package_integrity": [
        {
            "filename": "devplatform-po-transformer-35.1.8.tgz",
            "hashes": {
                "sha1": "7607fd7b6f6afe2b83d724de5954d451440db8f5",
                "sha512_sri": "sha512-6O8tSPsjoJIXzjAkDaLAIJSxYftLrTdoHh9vsF6TIGL6XCrTc8DzZzN/FImUSqJd2+vF1vSIDcrVzq0+xoYPrQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-po-transformer/MAL-2026-12733.json"