MAL-2026-12005

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/webdev-conf/MAL-2026-12005.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12005
Published
2026-08-04T23:57:12Z
Modified
2026-08-05T00:38:10Z
Summary
Malicious code in webdev-conf (npm)
Details

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

Source: amazon-inspector (9577d9f40486af224c5dd365ffbab6a5d45c4a052dfe6de50bc1d8f130d9642a)

webdev-conf@5.0.0 is a typosquat of the sindresorhus/pkg-conf library, published under author 'Sinde Sorus' sindesorus@gmail.com (homoglyph of Sindre Sorhus). index.js appends an eval(atob(...)) block after the legitimate library code. On require(), the decoded payload queries public Ethereum RPC endpoints and blockscout.com/api for the latest transaction sent from the attacker address 0xa322E5f3D311D3080e6f01210263e9aDC2490Ef1, extracts an IP address from that transaction, then fetches XOR-encrypted next-stage JavaScript from http://:443/0x/cls and http://:443/0x/ls, eval()s it in-process, and re-executes it via spawn('node', ['-e', payload], {detached:true, windowsHide:true}).unref(). Identifiers such as http, https, child_process, spawn, and the RPC URLs are hidden with \uXXXX unicode escapes. The C2 IP is rotatable by the attacker via on-chain transactions (EtherHiding technique). Any package that require()s webdev-conf triggers remote code execution on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-011359",
            "import_time": "2026-08-05T00:04:38.694650379Z",
            "modified_time": "2026-08-04T23:57:12Z",
            "sha256": "9577d9f40486af224c5dd365ffbab6a5d45c4a052dfe6de50bc1d8f130d9642a",
            "source": "amazon-inspector",
            "versions": [
                "5.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / webdev-conf

Package

Name
webdev-conf
View open source insights on deps.dev
Purl
pkg:npm/webdev-conf

Affected ranges

Affected versions

5.*
5.0.0

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": "index.js",
            "sha256": "9f1e75859e696811640fc348a0e7dfe664ed5dcd95017eacd7d6cdf3b3025d46",
            "tlsh": "ea521daa4692bb9bcb1b2673fc87570d237840b67a9c2b45310fd874b389c55748e60f"
        },
        {
            "path": "package.json",
            "sha256": "a999c4f3ed5d91129e457e2c1d85d6e9bee0018306ec3698f9268fa948603d16",
            "tlsh": "6a01f113852dded303d8aaec9c5ed4c7506f505228c69cee8cd3f634c2ec151128b156"
        }
    ],
    "package_integrity": [
        {
            "filename": "webdev-conf-5.0.0.tgz",
            "hashes": {
                "sha1": "8e679576b51036735148dea39c01b29c65773229",
                "sha512_sri": "sha512-oAnxnTtmyuLw5yHEmj37JWq09sEl1nCkvAx5EfkSvzGkcZy1pAw8WgMslFbb4qVQwSzdwW9Sf7TIuMu93QsJmw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/webdev-conf/MAL-2026-12005.json"