MAL-2026-12750

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-sdk/MAL-2026-12750.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12750
Published
2026-08-05T13:45:38Z
Modified
2026-08-05T14:36:54.340341213Z
Summary
Malicious code in devplatform-sdk (npm)
Details

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

Source: amazon-inspector (c72866f0f03d8960696f4e272cbff49b861cc66557c5250a7d77f90a2310f33c)

On require('devplatform-sdk'), index.js loads polyfill.js which auto-invokes start(): it selects a per-OS payload path, fetches a binary from string-concatenated Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) with DNS TXT fallback under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes it under /var/tmp or %TEMP% with a camouflaged name (.cache<rand> on Unix, dotnetdiag<rand>.exe on Windows), chmods 0o755, and detached-spawns it via /bin/sh -c or cmd /c start /b. Evasion features accompany the drop-and-run: hostnames assembled from split fragments via.join(''), the dropped binary renamed to look like a system cache/diagnostic file, a mtime-based stamp file at /tmp/.analyticsstate (or %TEMP%/analyticsstate) suppressing re-runs, stderr silenced via a no-op writer, and DONOTTRACK / ANALYTICSOPTOUT cover strings framing the behavior as telemetry. The package advertises itself as a lightweight SDK wrapper; the load-time behavior is a binary dropper delivering arbitrary attacker-controlled native code to the installer.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "c72866f0f03d8960696f4e272cbff49b861cc66557c5250a7d77f90a2310f33c",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:19:54.176724249Z",
            "modified_time": "2026-08-05T13:45:38Z",
            "versions": [
                "35.6.1"
            ],
            "id": "IN-MAL-2026-015028"
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-sdk

Package

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

Affected ranges

Affected versions

35.*
35.6.1

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "1ec2be764f2f18a166e55e73e06787927be8cc5e",
                "sha512_sri": "sha512-nxnSZC+AfPToq2P7cKmm+SGLH2t4Q4j+s18p0PW3CsPpzX28BVxIRuuAhVhNzkOrXJCyGqj97lzm6v4hXbbTFQ=="
            },
            "filename": "devplatform-sdk-35.6.1.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_polyfill.js",
            "sha256": "1e4f34648bab26b3d7cf588961c9089a9380f9132032520d95a49e9cc9fdea3a",
            "tlsh": "eea1989a05a6b0194fb0dbe4c71b5815f65bf66337808284fb9c55984f7352483b2efc"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-sdk/MAL-2026-12750.json"