MAL-2026-17565

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/typesens/MAL-2026-17565.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17565
Published
2026-10-05T03:37:54Z
Modified
2026-10-05T04:15:05Z
Summary
Malicious code in typesens (npm)
Details

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

Source: amazon-inspector (3ded39f31b2c2d4d73e0b576ab862c9ed90688153a43c359dae5b26854ad8738)

package.json declares postinstall wscript.exe 4444.vbs, which runs automatically on npm install. The shipped 4444.vbs (~765 KB) contains a multi-layer decryption chain (AES S-box, ChaCha20-IETF, SHA-256 constants XOR-masked with 0x5A5A5A5A) over ~665 base64 chunks, decodes a payload to %TEMP% as a.dat file, drops a PowerShell loader, and invokes powershell.exe to perform process hollowing on Windows. Function names in the VBS are randomized (PlatformProbeLVI, DeviceCatalogUBYQ, EndpointRegistryRFX) and the CreateObject target is XOR-decoded at runtime; a cover-story header labels the file as a 'Verdant Signals Corp Device Telemetry Aggregator'. The advertised library surface — src/index.js is a trivial zod-based email-domain check with no network I/O, and the README claims 'No installation scripts' and describes a 'booking-eligibility' utility — is a decoy contradicting the package.json files entry that ships 4444.vbs and the postinstall hook that runs it. The typosquat-shaped name (typesens) reinforces the lure framing.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021028",
            "import_time": "2026-10-05T03:57:39.903873807Z",
            "modified_time": "2026-10-05T03:37:54Z",
            "sha256": "3ded39f31b2c2d4d73e0b576ab862c9ed90688153a43c359dae5b26854ad8738",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / typesens

Package

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

Affected ranges

Affected versions

1.*
1.0.0

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": "package.json",
            "sha256": "cd88b3bbfe95a13ba12a8a7517f1fb377268f1f7cb5a89e6d776cfde795f83d0",
            "tlsh": "42e0d81389985e5314f8e7a1ad744612b1510f1f11714d0770fb015c8b669a7109fbad"
        },
        {
            "path": "4444.vbs",
            "sha256": "89a31ec0719b2137938c892385823ffb993d2d903e1fdfe17b246ba88531609a",
            "tlsh": "daf4f034658a68abb63bcafeace6c72935147c053040606c35deb6581bfdcd15bda0f8"
        },
        {
            "path": "readme.md",
            "sha256": "11f2ec1d479385714632f19967af06a5273b66baf7ffab8c9f9e400092735026",
            "tlsh": "3c3100444c23e37935b1e31bbc90b092e7f4915c0aa60c51b9aa835e1315f62fb7f84e"
        }
    ],
    "package_integrity": [
        {
            "filename": "typesens-1.0.0.tgz",
            "hashes": {
                "sha1": "4fedf17b5de20a106ccf65f4c71696adeeaa5569",
                "sha512_sri": "sha512-61uestwaxCTDLsKJVBZK01RFSeBmrt9Ly9UEisavuicw0xU811gPCdc9Nq9MGPEoyGzFFxugME+FNisieJ+9BQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/typesens/MAL-2026-17565.json"