MAL-2026-12734

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-prettier-config/MAL-2026-12734.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12734
Published
2026-08-05T13:46:43Z
Modified
2026-08-05T14:36:47.487476814Z
Summary
Malicious code in devplatform-prettier-config (npm)
Details

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

Source: amazon-inspector (db5580fbae2ba8f21820a5ba50d8e632cfc12192c3f7cbaeccc8065b4cb5c57d)

Package presents itself as a prettier configuration/settings manager. index.js requires compat.js at module load, which downloads a platform-specific binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev) assembled at runtime from string-split arrays via.join(''). If the HTTPS fetch fails, it falls back to a covert DNS TXT-record channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru (c.<domain> for chunk count, i.<domain> for base64-chunked payload), reassembles and executes the payload. The fetched bytes are written to /var/tmp/.cache<rand> on Linux or TEMP\dotnetdiag<rand>.exe on Windows using deceptive filenames, chmod 0755, then spawned detached via spawn("/bin/sh", ["-c",...]) or spawn("cmd",...). No hash or signature verification. A lock-file at /tmp/.analytics_state is used to suppress repeated runs. Destinations are unrelated to any prettier or JavaScript-tooling publisher.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015035",
            "import_time": "2026-08-05T14:19:54.970129569Z",
            "sha256": "db5580fbae2ba8f21820a5ba50d8e632cfc12192c3f7cbaeccc8065b4cb5c57d",
            "modified_time": "2026-08-05T13:46:43Z",
            "versions": [
                "35.1.3"
            ],
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-prettier-config

Package

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

Affected ranges

Affected versions

35.*
35.1.3

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-3/cxY9H1I3n5v/+XOM4tBt7Sqx2pHB7D322S+z91IO+dgYgury54MNsxQ0UCuGZZ7jUAL0kq1jDIvuQIQxS6WA==",
                "sha1": "07f01e79de91d6b3d20c7b547ddabe33cdf1a055"
            },
            "filename": "devplatform-prettier-config-35.1.3.tgz"
        }
    ],
    "evidence_files": [
        {
            "sha256": "de9da99c6464b15379f6c0931176fdfbb8f1918205ea14a419d2c4f6924f384d",
            "path": "_compat.js",
            "tlsh": "86a1965a12a6301987b09be4cb175415f65af6633780c2d4fb9ca9985f7312482b3efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-prettier-config/MAL-2026-12734.json"