MAL-2026-18453

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/calculator-preinstall-chain-demo/MAL-2026-18453.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-18453
Published
2026-11-01T00:39:35Z
Modified
2026-11-02T06:30:05Z
Summary
Malicious code in calculator-preinstall-chain-demo (npm)
Details

calculator-preinstall-chain-demo@1.1.2 has no install script of its own but depends on exactly calculator-preinstall-hook-demo@1.1.2, so npm install runs that package's preinstall script (node preinstall.js). The script POSTs the machine's hostname and the OS username to the Discord webhook https://discord.com/api/webhooks/1566215853794394162/xsqpEbSn-cc3DU2AKWdzqWnXX5hjTfV-gUePQZ4evrHGlZctMd40TKCrN42qnJd7moc1. Both packages were published by the npm account bigdevin55 on 2026-11-01.

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

Source: ossf-package-analysis (88c07c18a13b451e734355c6d2bb4ca05dc4c76209fe483b97403c968c09c0ea)

The OpenSSF Package Analysis project identified 'calculator-preinstall-chain-demo' @ 1.1.1 (npm) as malicious.

It is considered malicious because:

  • The package communicates with a domain associated with malicious activity.
Database specific 
{
    "iocs":  {
        "files":  [
            {
                "digests":  {
                    "sha256":  "bb605d4d0ff114fe127e7ecd8473d78ae49730d4b2b627d3cb0496c9fdd1f2e6"
                },
                "note":  "depends on calculator-preinstall-hook-demo 1.1.2, whose preinstall POSTs hostname and username to a Discord webhook (calculator-preinstall-chain-demo@1.1.2).",
                "paths":  [
                    "package.json"
                ],
                "source":  "PACKAGE_ARCHIVE"
            }
        ],
        "urls":  [
            "https://discord.com/api/webhooks/1566215853794394162/xsqpEbSn-cc3DU2AKWdzqWnXX5hjTfV-gUePQZ4evrHGlZctMd40TKCrN42qnJd7moc1"
        ]
    },
    "malicious-packages-origins":  [
        {
            "import_time":  "2026-11-02T06:26:01.369649878Z",
            "modified_time":  "2026-11-01T01:08:06Z",
            "sha256":  "88c07c18a13b451e734355c6d2bb4ca05dc4c76209fe483b97403c968c09c0ea",
            "source":  "ossf-package-analysis",
            "versions":  [
                "1.1.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / calculator-preinstall-chain-demo

Package

Name
calculator-preinstall-chain-demo
View open source insights on deps.dev
Purl
pkg:npm/calculator-preinstall-chain-demo

Affected ranges

Affected versions

1.*
1.1.1
1.1.2

Database specific

cwes 
[
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/calculator-preinstall-chain-demo/MAL-2026-18453.json"