MAL-2026-6542

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@osmura/treeify/MAL-2026-6542.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6542
Published
2026-06-26T21:41:48Z
Modified
2026-07-08T23:46:55Z
Summary
Malicious code in @osmura/treeify (npm)
Details

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

Source: amazon-inspector (4643c1f27e4916ea6090f1e6196c980fa1d65b96899a80b1f57633eaf16a61a9)

The package republishes the upstream treeify library (Luke Plaster, repo notatestuser/treeify) verbatim under the unrelated @osmura scope, preserving the original package.json author/repository/keywords/README as cover. Appended to treeify.js (starting around line 115) is ~93KB of obfuscator.io-style code (RC4+base64 string-array, while(!![]) control-flow flattening) that runs whenever a consumer does require('@osmura/treeify'). The injected code re-spawns Node detached with a marker environment variable, issues an HTTPS request to a hostname encoded inside the obfuscated string array, AES-256-GCM-decrypts the response using a key XOR-derived from four embedded base64 buffers, writes the plaintext payload into os.tmpdir()/<name>-<pid>/, and spawns it via child_process.spawn(..., {stdio:..., windowsHide: true, detached: true}) — see treeify.js:116 var aM = at[ba(0x19,...)](aK, aL, {'stdio':..., 'windowsHide':!![], 'detached':!![]}) and the corresponding https.request({method: 'GET', hostname: aG[...], timeout: 60000},...) call. Two independent injected IIFEs implement the same dropper with separate encoded URL pools, providing fallback C2. Any installer that requires this package fetches and executes attacker-controlled code on their machine at import time.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-007673",
            "import_time": "2026-06-26T22:30:41.502825002Z",
            "modified_time": "2026-06-26T21:41:55Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "4643c1f27e4916ea6090f1e6196c980fa1d65b96899a80b1f57633eaf16a61a9",
            "source": "amazon-inspector",
            "versions": [
                "1.1.2"
            ]
        },
        {
            "id": "IN-MAL-2026-007672",
            "import_time": "2026-06-26T22:30:41.383738672Z",
            "modified_time": "2026-06-26T21:41:48Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "ff88024c29a68b4dc5e73795a21a813393c8a6a56cfbef9c8a0950a63ec84256",
            "source": "amazon-inspector",
            "versions": [
                "1.1.3"
            ]
        },
        {
            "id": "IN-MAL-2026-008976",
            "import_time": "2026-07-08T23:27:56.909353846Z",
            "modified_time": "2026-07-08T23:00:42Z",
            "sha256": "b283e5aa252a764aa045b86b27f57b54f1c175cbd37e933bb0f60decbf8cb0ca",
            "source": "amazon-inspector",
            "versions": [
                "1.1.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @osmura/treeify

Package

Name
@osmura/treeify
View open source insights on deps.dev
Purl
pkg:npm/%40osmura/treeify

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.0
1.1.2
1.1.3

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"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "treeify.js",
            "sha256": "612b89ae1789817f9d1cca75f7c054010c1a1628afe538b31f1dced58c11a4b4",
            "tlsh": "4e932b867eea70af525251f3122f7196d56d9c99b24c8408f411ccecbf6423ce2b66bc"
        },
        {
            "path": "package.json",
            "sha256": "bf5119c67c496a4174811894b622d38278bfd7c2ac268fb2f323639f7d1e2211",
            "tlsh": "3201c020d9649d230adc79a06d5d0043a1204c4b58ecfd0577e7412c9b1c17738fd2ad"
        }
    ],
    "package_integrity": [
        {
            "filename": "treeify-1.1.2.tgz",
            "hashes": {
                "sha1": "3714725cbf68087940ee1830ddddf4d087795f8d",
                "sha512_sri": "sha512-ljXKb95iSbTufE2YFpI4tPWpXg18K1s08/P0fY2OdKa/23pnXxgCy/ZCc6EHJSAdEYwCYDXhdZ3pY4Prk6+i5w=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@osmura/treeify/MAL-2026-6542.json"