MAL-2026-10524

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@velkov/isows/MAL-2026-10524.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-10524
Published
2026-07-14T03:36:38Z
Modified
2026-07-14T04:46:59Z
Summary
Malicious code in @velkov/isows (npm)
Details

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

Source: amazon-inspector (4fee1d7d5125231d00f9c5f9afe9817b76900ca385b7d077bb4b8bcf3d9ca660)

Package is published as @velkov/isows while its README, repository (wevm/isows), description ("Isomorphic WebSocket"), and author (jxom.eth) impersonate the legitimate isows package. The legitimate upstream utils.ts is an 8-line getNativeWebSocket helper; in this package, _cjs/utils.js and _esm/utils.js append ~50KB of obfuscator.io-style payload (rotated string array a4(), base64+RC4 decoder a5(), debugger-trap class, while(!![]) loops). The payload runs at top level whenever the package is required or imported (the package.json main is ./_cjs/index.js, which loads ./utils.js). Behavior: re-execs Node with a sentinel env var, dynamically loads https/fs/os/child_process/path/crypto, issues an HTTPS GET to an RC4-decoded host/path, streams the response to a hostname-derived filename under os.tmpdir(), validates a sha256 from a sidecar JSON fetched from the same attacker-controlled host (attacker controls both payload and verification), AES-256-GCM-decrypts the bytes with a key XOR-derived from four embedded 32-byte buffers, chmods 0o755, and spawns the binary {detached:true, stdio:'ignore', windowsHide:true} so it survives the parent process. Error-handling stubs are empty to suppress diagnostics. This is the canonical typosquat-plus-dropper supply-chain attack pattern: any installer or transitive consumer that loads @velkov/isows runs attacker-controlled native code on their machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-010370",
            "import_time": "2026-07-14T04:31:59.35815037Z",
            "modified_time": "2026-07-14T03:36:38Z",
            "sha256": "4fee1d7d5125231d00f9c5f9afe9817b76900ca385b7d077bb4b8bcf3d9ca660",
            "source": "amazon-inspector",
            "versions": [
                "1.0.10"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @velkov/isows

Package

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

Affected ranges

Affected versions

1.*
1.0.10

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": "_cjs/utils.js",
            "sha256": "fdc5094d81fda7473eda1d6fefac929018819ff6fb89ceb89baa75bf5ad396ee",
            "tlsh": "bf931a867edb707f535261f3112b6182e56d9ca9734c8504e162ccecbea423ce3666bc"
        }
    ],
    "package_integrity": [
        {
            "filename": "isows-1.0.10.tgz",
            "hashes": {
                "sha1": "35e17ec507470bbef7f8f848a9e6cf2f401faf7c",
                "sha512_sri": "sha512-MJ0YK7Eyn1VCQaUiLNGFGWWHVZ+8A9PXU50pSqmV0DTUn3hK+iJVSgIzuv1m/iaqR1OjgitUKmAWkgYkKnZtnA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@velkov/isows/MAL-2026-10524.json"