MAL-2026-12179

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/fb-insurance--boxified-form-vzr-test/MAL-2026-12179.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12179
Published
2026-08-05T09:04:59Z
Modified
2026-08-05T10:06:09.405858721Z
Summary
Malicious code in fb-insurance--boxified-form-vzr-test (npm)
Details

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

Source: amazon-inspector (a1527da37d48efd3c216bf62d4f3d167181948006ad5d8e88f2ff9fa40eb0875)

On require of the package, index.js loads _loader.js which selects a platform-specific endpoint, fetches an executable payload over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, cf100-416.workers.dev, cf103-070.workers.dev), writes it to /var/tmp or %TEMP% under a deceptive filename (.cache_<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), chmods it 0755, and spawns it detached-and-unref'd via /bin/sh -c or cmd. If the HTTPS mirrors fail, _loader.js falls back to a DNS-TXT covert channel: it resolves c.<domain> for a chunk count against resolvers under *.dl.well1.site (tin/tina/ldr/win subdomains) and reassembles N base64 TXT fragments from <i>.<domain> into the same executable buffer. Destination hostnames and resolver domains are constructed at runtime by joining short substring arrays (e.g. ['oob-worker.cf99-9b3','.worker','s.dev'].join('')) to evade static string matching. No hash or signature is verified on the fetched bytes. The fetched executable runs with the installer's privileges.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014537",
            "import_time": "2026-08-05T09:28:23.401704447Z",
            "sha256": "a1527da37d48efd3c216bf62d4f3d167181948006ad5d8e88f2ff9fa40eb0875",
            "modified_time": "2026-08-05T09:04:59Z",
            "versions": [
                "20.3.7"
            ],
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / fb-insurance--boxified-form-vzr-test

Package

Name
fb-insurance--boxified-form-vzr-test
View open source insights on deps.dev
Purl
pkg:npm/fb-insurance--boxified-form-vzr-test

Affected ranges

Affected versions

20.*
20.3.7

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-UO6erBA0tb6wnk8JoR7+VVUJ7/thSdJpSxZpRM/4FKxj5ShZECIpOpmjUQZMw1KIwwisDwiFwpC1Sav/EqFvqQ==",
                "sha1": "eced97bb7053e6e974af17d7639ab1e16dad91a8"
            },
            "filename": "fb-insurance--boxified-form-vzr-test-20.3.7.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_loader.js",
            "sha256": "8f4b71e41252439a015622455feddca488cff6f49108206b3d0fd58847ac8e3a",
            "tlsh": "dfa1b49a16a5701d8bb0e7e1c71b4816f61bf2633390d294fb9c69945fb24248372efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/fb-insurance--boxified-form-vzr-test/MAL-2026-12179.json"