MAL-2026-13344

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ezfnfix/MAL-2026-13344.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13344
Published
2026-08-05T15:54:07Z
Modified
2026-08-05T16:51:02.572625411Z
Summary
Malicious code in ezfnfix (npm)
Details

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

Source: amazon-inspector (3a5bd6bf9cde5f28e20365db24b77ca15226b5248a3be482e30c45d98259b301)

On Windows, npm install ezfnfix automatically executes a bundled Windows PE binary via a postinstall hook. package.json declares scripts.postinstall = "node postinstall.js", and postinstall.js enumerates bin/*.exe and runs the first entry with execFileSync. The shipped bin/ezfn.exe is a ~114 KB VB.NET executable whose metadata contains identifiers consistent with a remote-access trojan and infostealer: Telegram bot exfiltration primitives (SendBot, ChatID), socket C2 (ClientSocket, ConnectServer, ActivatePong), a spreading routine (Spread), AV/Defender-exclusion logic (Exclusion), webcam access (avicap32.dll), WMI-based host enumeration (ManagementObjectSearcher, getUserName, getMachineName, getOSFullName, getTotalPhysicalMemory), registry persistence handles (RegistryKey, CurrentUser), symmetric cryptography primitives, and WebClient/DownloadString network fetch. The binary ships with no source, no build step, no hash or signature verification, and no purpose consistent with the package name. Installing on Windows results in immediate execution of the RAT against the installer's host, exfiltrating identity and system information via Telegram/socket channels and providing persistent remote access.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015808",
            "import_time": "2026-08-05T16:13:47.833898622Z",
            "sha256": "3a5bd6bf9cde5f28e20365db24b77ca15226b5248a3be482e30c45d98259b301",
            "modified_time": "2026-08-05T15:54:07Z",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / ezfnfix

Package

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

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "postinstall.js",
            "tlsh": "7ee068d207da9b71a4b1c6c1ee6922b7294fc961730ab890c0ec4d89138319447c3aec",
            "sha256": "9c9a3f407987b486d814218d4397b63d86b2b773b04e2a8b7981bd864b64310f"
        },
        {
            "path": "bin/ezfn.exe",
            "tlsh": "19b34b4efb458a08c15d0e778563658a82fac867e927f76f25cc1eda8d618ccc9cf484",
            "sha256": "418e262088eb5f3ba30cd456c775a607232d0d148c2aa20fe0e10433016cb681"
        }
    ],
    "package_integrity": [
        {
            "filename": "ezfnfix-1.0.0.tgz",
            "hashes": {
                "sha1": "5680b09da8b0592ee49c6703f5b17093e59bdd7d",
                "sha512_sri": "sha512-ZLm/KnEHNSOjW2nywxB2X0cSga+vYzMK3w/D8297MRWA2ZDw5BGWO80ea/+pZbvCeoYMnqJTwT/LqXOWirW8vg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ezfnfix/MAL-2026-13344.json"