MAL-2026-14142

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/testingsmthb1g/MAL-2026-14142.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-14142
Published
2026-08-18T23:26:01Z
Modified
2026-08-18T23:45:11.530574347Z
Summary
Malicious code in testingsmthb1g (npm)
Details

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

Source: amazon-inspector (04fa6b8b5826315448e5d4f27036ab31ef115621027c040897e200894c43dfa3)

scripts/postinstall.js runs at npm install and performs an install-time dropper chain. A URL stored as an integer array is XOR-decoded (key 'stf2026') to https://github.com/bebraz1/qPzM50V1AKG0rVlH/releases/download/null/main.exe — a personal GitHub account unrelated to the package publisher, at a random-named repository with a mutable 'null' release tag. On Windows, the script downloads this binary to the TEMP directory and spawns it detached with stdio ignored. On WSL/virtualized Linux, the script detects the environment via /proc/version and WSLDISTRONAME, assembles an XOR-decoded PowerShell command line, and executes it via exec() to fetch and run the same payload on the Windows host, escaping the Linux sandbox. In parallel, the script POSTs a platform label to a hardcoded bare-IP endpoint http://193.70.34.101:20099/vote whose hostname is constructed via split-join to evade string matching. The destination URL, PowerShell command, and shell fragments are all XOR-obfuscated integer arrays reconstructed at runtime.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-18T23:41:22.873486589Z",
            "source": "amazon-inspector",
            "modified_time": "2026-08-18T23:26:01Z",
            "sha256": "04fa6b8b5826315448e5d4f27036ab31ef115621027c040897e200894c43dfa3",
            "id": "IN-MAL-2026-018196",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / testingsmthb1g

Package

Name
testingsmthb1g
View open source insights on deps.dev
Purl
pkg:npm/testingsmthb1g

Affected ranges

Affected versions

1.*
1.0.0

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/testingsmthb1g/MAL-2026-14142.json"
indicators 
{
    "evidence_files": [
        {
            "sha256": "e3ce3954c445e7e18a648de2f242ee382e2a55971e97ed6a931204b5422a880b",
            "path": "scripts/postinstall.js",
            "tlsh": "2ed13fca1ef590348347f96884cf9d13b2a6c207320d4a65ff8f41107f5793c85a69e9"
        }
    ],
    "package_integrity": [
        {
            "filename": "testingsmthb1g-1.0.0.tgz",
            "hashes": {
                "sha1": "22ba20d1d59b3594ec08464be3e907e75d15e8c2",
                "sha512_sri": "sha512-6v0oj75/3JGOw6QPpf4qDqX8JJHsEKWL6TxXhfLw9qxtg3dApvWHmERGHFsGNZlEiHG9G9QyU20rmgWFnZP4ZQ=="
            }
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    }
]