MAL-2026-12327

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@offa-uwk/offa-uwk/MAL-2026-12327.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12327
Published
2026-08-05T12:45:09Z
Modified
2026-08-05T13:35:13.040452093Z
Summary
Malicious code in @offa-uwk/offa-uwk (npm)
Details

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

Source: amazon-inspector (115f62b574a9c9c91a35c6a489b74a38d6132b4d8e706deb388d2f6df1dc32f2)

On npm install, the package's postinstall script (node index.js) collects host identifiers (os.hostname(), os.userInfo().username, process.cwd()) and POSTs them via HTTPS to a hardcoded webhook.site collector at https://webhook.site/e6b10849-38dc-4280-a8e3-72ab39cfaf65. Immediately after the beacon, the script executes shutdown -h now with a fallback of systemctl poweroff, forcibly powering off the installing host. A preinstall step also writes a marker file to the absolute path /home/OFFA/flag, outside the package directory. Package metadata (name @offa-uwk/offa-uwk, version 999.0.6) is consistent with a proof-of-concept malicious artifact.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-05T13:08:42.982888256Z",
            "versions": [
                "999.0.6"
            ],
            "modified_time": "2026-08-05T12:45:09Z",
            "source": "amazon-inspector",
            "sha256": "115f62b574a9c9c91a35c6a489b74a38d6132b4d8e706deb388d2f6df1dc32f2",
            "id": "IN-MAL-2026-014746"
        }
    ]
}
References
Credits

Affected packages

npm / @offa-uwk/offa-uwk

Package

Name
@offa-uwk/offa-uwk
View open source insights on deps.dev
Purl
pkg:npm/%40offa-uwk/offa-uwk

Affected ranges

Affected versions

999.*
999.0.6

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "187ed337d2037af38adc0e691c14f963cbb7aca0",
                "sha512_sri": "sha512-kRYYQhn2hWYjPYxtXi1220Hm2/mrDLwjB5pAsPsfisbR1mN5H4d8ji+++eF2OQld3sED2FGnsYuXjnPrJGAGPw=="
            },
            "filename": "offa-uwk-999.0.6.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "index.js",
            "sha256": "0704d1cefad87e554993e01a20236708da1b46075e24907448d13c8ecb12f277",
            "tlsh": "d83114e005b25270a7b320d5e50b781eb1b3c4077245ed20b9dc8358bfc94b8dab6af5"
        },
        {
            "path": "package.json",
            "sha256": "fefbf451abc700e90ebd5b41d444085af6557a63523d1ce01b0c2f9ab5911946",
            "tlsh": "08d0c2304e10992369c057aa0837a4467aa14e1780547c04a7eb122841dbbbb44ffb3e"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@offa-uwk/offa-uwk/MAL-2026-12327.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]