MAL-2026-13224

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-microfrontend/MAL-2026-13224.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13224
Published
2026-08-05T15:37:21Z
Modified
2026-08-05T16:50:00Z
Summary
Malicious code in bigops-microfrontend (npm)
Details

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

Source: amazon-inspector (53767eeec6e6f398e15ba75b3143b7fba8eb0a803579e2788a55163393bb2789)

index.js unconditionally requires./shim on load. shim.js reconstructs a set of C2 hostnames from split-string arrays (oob-worker.cf99-9b3.workers.dev, cf101-adf, cf102-baf, cf103-070.workers.dev), selects a platform-keyed endpoint for linux/darwin/win32, downloads an opaque native binary over HTTPS with a DNS-TXT fallback channel (c. for chunk count, i. for base64 chunks under *.dl.wel1.ru), writes it to /tmp or %TEMP% under disguising names such as.cache and dotnet_diag.exe, chmods it 0755, and spawns it detached via /bin/sh -c ' &' or cmd. The behavior fires on any require() of the package, giving full arbitrary code execution on the installer's host. lib/telemetry.js additionally bundles a parallel dropper implementation with the same HTTPS+DNS-TXT service discovery, base64 chunk assembly, chmod 0755, and detached shell spawn, framed as an analytics SDK; it is not on the auto-execute path in this tarball but ships the same attack machinery. The destination hostnames are obfuscated via split-string concatenation and the Windows drop name impersonates a.NET diagnostic tool.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015769",
            "import_time": "2026-08-05T16:13:43.180316669Z",
            "modified_time": "2026-08-05T15:37:21Z",
            "sha256": "53767eeec6e6f398e15ba75b3143b7fba8eb0a803579e2788a55163393bb2789",
            "source": "amazon-inspector",
            "versions": [
                "35.4.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-microfrontend

Package

Name
bigops-microfrontend
View open source insights on deps.dev
Purl
pkg:npm/bigops-microfrontend

Affected ranges

Affected versions

35.*
35.4.1

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": "f92745c7d1f21d544d4a77207caf15a5565811275461f5db78d9df89f3d0e2aa",
            "tlsh": "9eb1975a12a6700847709be4c7175416f65be6633780c2d4f76ca9985f771388372efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "82a8451e0b1a4da59c7b204b26675953824e2947f14980f70e8e7765724c6a91",
            "tlsh": "af835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bigops-microfrontend-35.4.1.tgz",
            "hashes": {
                "sha1": "5607f6d8693cd8678edf7c80941573de668c5b0c",
                "sha512_sri": "sha512-d3FI7uy5aBbskjWJsy/1f5tND4Ljt+MqjFY1b4Ce+UMH0m2A7LKIS2hpLOpNfYq6/VS5+uTYXhRxkYfKfWK8rA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-microfrontend/MAL-2026-13224.json"