MAL-2026-13595

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/dolyame-ui-postcsscustomproperties/MAL-2026-13595.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13595
Published
2026-08-07T12:33:09Z
Modified
2026-08-07T13:20:52Z
Summary
Malicious code in dolyame-ui-postcsscustomproperties (npm)
Details

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

Source: amazon-inspector (a8be08d3eb5601ca7f7b5f74c34e3fd0ebba91f0b72dea8ab4b0642bb9695c0c)

On require() of the package, shim.js and lib/telemetry.js (reached via the main entry) select a platform-specific payload, download a binary over HTTPS from string-split Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), and fall back to reassembling base64 chunks retrieved from DNS TXT queries against *.sdk.dl.wel1.ru. The fetched bytes are written to /var/tmp/.cache on Unix or %TEMP%\dotnet_diag_.exe on Windows, chmod 0755, and detached-spawned via /bin/sh -c or cmd.exe. Destination hosts, module names, and API names are string-split and reassembled at runtime (require("child_"+"process"), fs["chmod"+"Sync"], hostnames joined from arrays) to defeat static inspection. The package name typosquats postcss-custom-properties and the dropper is labelled as an 'Analytics SDK' / 'telemetry' module.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-017027",
            "import_time": "2026-08-07T12:51:22.803352914Z",
            "modified_time": "2026-08-07T12:33:09Z",
            "sha256": "a8be08d3eb5601ca7f7b5f74c34e3fd0ebba91f0b72dea8ab4b0642bb9695c0c",
            "source": "amazon-inspector",
            "versions": [
                "35.8.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / dolyame-ui-postcsscustomproperties

Package

Name
dolyame-ui-postcsscustomproperties
View open source insights on deps.dev
Purl
pkg:npm/dolyame-ui-postcsscustomproperties

Affected ranges

Affected versions

35.*
35.8.1

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": "_shim.js",
            "sha256": "64d1d92eadd6159cff03263e967b74bb5d7748919d15724bf6e874a80be6d6f1",
            "tlsh": "0aa1c85906fa30184292e5d4452f9816719ef56332c5f988ff4c66944fea17883f39fc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "205241b5613712773e0b781448e238e6f18067e283e181a1ac996b8b159ae735",
            "tlsh": "e7733f4966fb10214263b0685fab40437635c4072a4eed5dba9c43ec9f8db3896f1fb9"
        }
    ],
    "package_integrity": [
        {
            "filename": "dolyame-ui-postcsscustomproperties-35.8.1.tgz",
            "hashes": {
                "sha1": "34624e51e8c3e793226b2994710c201210fdc837",
                "sha512_sri": "sha512-UrDspqXqjAaOCezrs2GpF5pyFZkQbFSmdGZrY8KxXuCbKXxqYQp3YuLIe2WoRMyRXLawdZxOrYSeqzjsskWa3Q=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/dolyame-ui-postcsscustomproperties/MAL-2026-13595.json"