MAL-2026-6487

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/velocityfix/MAL-2026-6487.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-6487

Aliases

GHSA-2736-v5cj-q9x5

Published

2026-06-25T22:29:50Z

Modified

2026-06-29T06:01:42.363104357Z

Summary

Malicious code in velocityfix (npm)

Details

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

Source: amazon-inspector (c937a54c3629f80fb7b92fbdafda502706b6028b43bc4675eb30c55d9bc059e9)

Package masquerades as 'Performance fixes for Minecraft Velocity proxy' authored by 'Velocity Team' — Velocity is a Java project from PaperMC and has no legitimate npm distribution. package.json declares scripts.postinstall = 'node scripts/loader.js', which silently spawns a bundled payload.exe via start /b on every npm install. The bundled PE contains a hardcoded C2 at https://751.lol/upload/ and posts a multipart form with fields username, os_info, ip_address, and file=data.zip — exfiltrating the installer's hostname, OS, IP, and a zip of collected files to an attacker-controlled host. The payload labels itself [INJECTOR], reads registry values (ProductName, DisplayVersion), and performs sandbox / VM evasion (probes for SbieDll.dll, snxhk.dll, Vboxguest.sys, vmGuestLib.dll, VMware/VirtualBox artifacts) so it only fully detonates on real victim hosts. The combination of brand-impersonation lure, install-time auto-execution of an opaque native binary, hardcoded exfil endpoint, and anti-analysis evasion is an unambiguous Windows-targeted supply-chain dropper.

Source: ghsa-malware (9baaec1a1ef9243e12f876eb21d81e1f02912fe2e56aee1646d95e679a20b5ea)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific

{
    "malicious-packages-origins": [
        {
            "versions": [
                "1.0.0"
            ],
            "modified_time": "2026-06-25T22:29:50Z",
            "sha256": "142cdb1bd0aba9acb4d755c2d6e0c7e0c5020d49768935650543a1522d2edee1",
            "id": "IN-MAL-2026-007554",
            "source": "amazon-inspector",
            "import_time": "2026-06-25T23:00:34.059189216Z"
        },
        {
            "versions": [
                "1.0.4"
            ],
            "modified_time": "2026-06-25T22:29:52Z",
            "sha256": "9c621595d285c7b85af10a3f48d8a19e702ede34f5f5148ba4084fc127eedccd",
            "id": "IN-MAL-2026-007555",
            "source": "amazon-inspector",
            "import_time": "2026-06-25T23:00:34.123409184Z"
        },
        {
            "versions": [
                "1.0.1"
            ],
            "modified_time": "2026-06-25T22:29:53Z",
            "sha256": "c937a54c3629f80fb7b92fbdafda502706b6028b43bc4675eb30c55d9bc059e9",
            "id": "IN-MAL-2026-007557",
            "source": "amazon-inspector",
            "import_time": "2026-06-25T23:00:34.352962036Z"
        },
        {
            "versions": [
                "1.0.3"
            ],
            "modified_time": "2026-06-25T22:29:53Z",
            "sha256": "f2212fdf3151fb0b4de00815883e0c7d222b80e3947ea947f112ce43694942cd",
            "id": "IN-MAL-2026-007556",
            "source": "amazon-inspector",
            "import_time": "2026-06-25T23:00:34.214069842Z"
        },
        {
            "versions": [
                "1.0.2"
            ],
            "modified_time": "2026-06-25T22:29:55Z",
            "sha256": "faea99dc9d237e8315d29d14c69692766e6ef7f02a570686c09904d1a33f812d",
            "id": "IN-MAL-2026-007558",
            "source": "amazon-inspector",
            "import_time": "2026-06-25T23:00:34.425466862Z"
        },
        {
            "source": "ghsa-malware",
            "modified_time": "2026-06-29T03:33:03Z",
            "sha256": "9baaec1a1ef9243e12f876eb21d81e1f02912fe2e56aee1646d95e679a20b5ea",
            "id": "GHSA-2736-v5cj-q9x5",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "import_time": "2026-06-29T05:52:49.561875425Z"
        }
    ]
}

References

Credits

- Amazon Inspector - FINDER
- - inspector-research@amazon.com

Affected packages

npm / velocityfix

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.0

1.0.1

1.0.2

1.0.3

1.0.4

Database specific

cwes

[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]

indicators

{
    "package_integrity": [
        {
            "filename": "velocityfix-1.0.0.tgz",
            "hashes": {
                "sha512_sri": "sha512-A1yxGIEJtl6QKx1XKfHlcJvlc6bvXhC9InNjotdnWU49aXRdn67LsRaY3kH2hqB7Fm+G3vi6iTw5nGreHc0dGA==",
                "sha1": "831330e1d05b4c438b5e926ab23b46166992b65e"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "scripts/loader.js",
            "tlsh": "47019ed6099193f8877057f01772688ae00bd1373782d9d8b86cc4c94f732542aa1efd",
            "sha256": "03329388fb7214546d6ef6fa30ace3510eda365d36f8eb4303eb2c86aabee8ba"
        },
        {
            "path": "package.json",
            "tlsh": "92e06818ce20d92364e9be690e78c50325d00e2b50003e4e23e7206857debb688fe22e",
            "sha256": "45e0a4cb07a7974f3556569de0dbb9886ee2a88d18f82b34df78261867eec640"
        }
    ]
}

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/velocityfix/MAL-2026-6487.json"