MAL-2026-13260

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-s3/MAL-2026-13260.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13260
Published
2026-08-05T15:31:12Z
Modified
2026-08-05T16:50:21.804201620Z
Summary
Malicious code in devplatform-spa-plugin-s3 (npm)
Details

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

Source: amazon-inspector (8ca84ec076b60ced1412d45476eb90fb5c797b8dd53a5151d474dc979a085565)

devplatform-spa-plugin-s3@35.5.9 is a binary dropper. index.js unconditionally requires shim.js, whose top-level init() fetches a platform-specific binary over HTTPS from destinations reassembled at runtime by joining split string fragments (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev), writes it to /tmp or a Windows temp directory under disguised names such as dotnetdiag<rnd>.exe and.cache<rnd>, chmods it to 0755, and spawns it detached via cp.spawn('/bin/sh',['-c', fp+' &'],{detached:true}) or cp.spawn('cmd.exe',['/c','start','/b',fp]). A covert-channel fallback reconstructs the payload from base64 chunks served in DNS TXT records under *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). Execution is gated by a /tmp/.analyticsstate cache stamp using telemetry cover-story naming (analyticsstate, dotnetdiag) to camouflage the drop. A second equivalent dropper module is bundled at lib/telemetry.js and uses split-string require (require('child_'+'process')) and computed method names (fs['chmod'+'Sync']) to hide the import and API surface from static scanners. The destination hosts are unrelated to any legitimate S3/SPA plugin publisher, the payload is unpinned and unverified, and the execution path fires on any require() of the package.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T15:31:12Z",
            "id": "IN-MAL-2026-015730",
            "import_time": "2026-08-05T16:13:37.208458566Z",
            "versions": [
                "35.5.9"
            ],
            "source": "amazon-inspector",
            "sha256": "8ca84ec076b60ced1412d45476eb90fb5c797b8dd53a5151d474dc979a085565"
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-spa-plugin-s3

Package

Name
devplatform-spa-plugin-s3
View open source insights on deps.dev
Purl
pkg:npm/devplatform-spa-plugin-s3

Affected ranges

Affected versions

35.*
35.5.9

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "devplatform-spa-plugin-s3-35.5.9.tgz",
            "hashes": {
                "sha512_sri": "sha512-J7qLuPRoOIxmq9dRwxCT1q2F8ItKvymBjo+aAOr+QF6Eagfs+4jx6+No08RYPxmZq7zwgWnmfZHKyyCFb7JM6Q==",
                "sha1": "244f36a6910197d1aa9d8bcf2a4bdc0fcb7fcd8c"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "_shim.js",
            "tlsh": "cca1a49616a670184bb0a7e4c61b8815f65bf66337c182c4f79ca5984fb351483b2efc",
            "sha256": "179095c0301e998066a3b83ac953839ce717151df42b1b2d4c24f555aed15fa1"
        },
        {
            "path": "lib/telemetry.js",
            "tlsh": "c9835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "699e78f63c76f6bd83b2ca70cd570747b0993a32c4354e15b5f7f3303d136b41"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-s3/MAL-2026-13260.json"