MAL-2026-14167

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chalk-lib/MAL-2026-14167.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-14167
Published
2026-08-18T23:59:21Z
Modified
2026-08-19T00:30:13Z
Summary
Malicious code in chalk-lib (npm)
Details

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

Source: amazon-inspector (57cc6705c0b1dabca055a6531e36802822a4441a367459efb4ba8ecbc4a92ce5)

chalk-lib is a typosquat of the popular chalk package with an empty library body (index.js exports {}) whose entire effect is the postinstall lifecycle script. On npm install, scripts/postinstall.js XOR-decodes (key 'stf2026') a hardcoded URL pointing at github.com/bebraz1/qPzM50V1AKG0rVlH/releases/download/null/main.exe, downloads the executable to %TEMP%/main.exe on Windows, and spawns it detached with stdio:'ignore' and windowsHide:true. When the environment is WSL or Linux with the Windows host reachable (WSL_DISTRO_NAME / /proc/version / /proc/sys/kernel/osrelease containing 'microsoft'), a second code path XOR-decodes a PowerShell bridge command and script and exec()s it to fetch and run the same binary on the Windows host, extending the attack across the WSL boundary. In parallel, postinstall POSTs a JSON body containing the installer's platform label to a hardcoded bare-IP endpoint at 193.70.34.101:20099/vote over plain HTTP; the IP is assembled by joining the octet array ['193','70','34','101'] to evade static string matching. URLs, the PowerShell command, and the bridge script are all stored as integer arrays and reconstructed via an XOR unpackSegment() routine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-018251",
            "import_time": "2026-08-19T00:21:13.200552093Z",
            "modified_time": "2026-08-18T23:59:21Z",
            "sha256": "57cc6705c0b1dabca055a6531e36802822a4441a367459efb4ba8ecbc4a92ce5",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / chalk-lib

Package

Name
chalk-lib
View open source insights on deps.dev
Purl
pkg:npm/chalk-lib

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": "scripts/postinstall.js",
            "sha256": "3f7facba4826f2ffd86e5def3d859bd3ee68de640e3ec9ba2598a057d222ba30",
            "tlsh": "6ed13fca1ef59035874bf96884cf9d13b2a6c207320e4a65ff8f42107f5793c85a69e9"
        }
    ],
    "package_integrity": [
        {
            "filename": "chalk-lib-1.0.0.tgz",
            "hashes": {
                "sha1": "01bc9a11957ce6141262c7fe6775b2ab8fa80142",
                "sha512_sri": "sha512-OYfoExjR2EWo18WWf6jFvA9lqR2LyP5sXyBPPfCPgAyV8lL5S1MenRulxCTwflel81c+YPjsINf9YJmzPGtMow=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chalk-lib/MAL-2026-14167.json"