MAL-2026-13521

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@rbxst/services/MAL-2026-13521.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13521
Published
2026-08-07T12:27:51Z
Modified
2026-08-07T13:20:11.106812558Z
Summary
Malicious code in @rbxst/services (npm)
Details

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

Source: amazon-inspector (f8e349df2092cb3672698c00cefa5268881f21a60d1f71394c9e223b40d086d2)

scripts/postinstall.js runs at npm install time. On Windows it downloads a ZIP archive from https://files.catbox.moe/rp8idk.zip (anonymous file-hosting service, mutable content), uses PowerShell Expand-Archive to unpack it to a randomized temp directory, then spawns a bundled pythonw.exe against exec_.py with detached:true, stdio:'ignore', windowsHide:true, and child.unref(), so the fetched payload runs hidden and outlives the npm process. The script exits silently on non-Windows platforms. The package advertises roblox-ts service type utilities and has no legitimate need to fetch and execute a Python interpreter from an anonymous file host. This matches the alternate-runtime dropper pattern from known-bad infrastructure: an opaque remote payload executes on the installer's machine with the installer's privileges.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-07T12:51:21.237112979Z",
            "id": "IN-MAL-2026-016991",
            "source": "amazon-inspector",
            "sha256": "f8e349df2092cb3672698c00cefa5268881f21a60d1f71394c9e223b40d086d2",
            "versions": [
                "1.0.756"
            ],
            "modified_time": "2026-08-07T12:27:51Z"
        }
    ]
}
References
Credits

Affected packages

npm / @rbxst/services

Package

Name
@rbxst/services
View open source insights on deps.dev
Purl
pkg:npm/%40rbxst/services

Affected ranges

Affected versions

1.*
1.0.756

Database specific

indicators 
{
    "evidence_files": [
        {
            "path": "scripts/postinstall.js",
            "tlsh": "59614f4e05f3a23081b3b59d9bafa01e9027c5437149df90fcac86412f563788a91bed",
            "sha256": "99d06f9d7e1a0900822b813c40f25aec1717d6af83ce071cff3b6e7e93d6c84c"
        }
    ],
    "package_integrity": [
        {
            "filename": "services-1.0.756.tgz",
            "hashes": {
                "sha1": "a8f5b86ac17d7becfc4afc7c9b140184a8ef7ddc",
                "sha512_sri": "sha512-rLi5ojXZwWhUOXHcsbvZYmYn5vuYf6ZYZDHlH8fchBfEcjvEn3QZe+a3FX73KZTmX79T/W8JMPBUfFiw/e+1Aw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@rbxst/services/MAL-2026-13521.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]