MAL-2026-4185

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/uolcs-host-uol-anuncios-fe/MAL-2026-4185.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-4185
Published
2026-05-20T16:06:01Z
Modified
2026-05-26T06:03:00.620408646Z
Summary
Malicious code in uolcs-host-uol-anuncios-fe (npm)
Details

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

Source: amazon-inspector (16d9407c815fe2d5593da029ee806d455d15f451d1c84d3cd8d6a0a027821d64)

Package claims an internal-scope corporate name (uolcs-host-uol-anuncios-fe) on public npm, version-pinned to 99.99.99 — the canonical dependency-confusion shape designed to win resolution against an internal package of the same name in a target organization's CI. Both preinstall and postinstall hooks in package.json invoke node./callback.js, which reads os.hostname() and os.platform(), embeds them as a subdomain label (uolci-<hostname>-<platform>.d86r3dv5vn81lvohffp0131g8kdx9mz3c.oast.pro), and issues a DNS A lookup. The destination oast.pro is the interactsh out-of-band interaction listener; the DNS query itself is the exfiltration channel, capturing the installer's hostname and OS at the listener owned by whoever controls that token. The README's claim of authorized research is not verifiable from package contents and does not change the installer-side effect: any CI host or developer machine that resolves this name from public npm leaks identity to a third party on npm install.

Source: ossf-package-analysis (460c859985a6f675c559fa18b353ab35f370e5f1f60c9da53275358a1fdbaa29)

The OpenSSF Package Analysis project identified 'uolcs-host-uol-anuncios-fe' @ 99.99.99 (npm) as malicious.

It is considered malicious because:

  • The package communicates with a domain associated with malicious activity.
Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-05-20T16:06:01Z",
            "versions": [
                "99.99.99"
            ],
            "sha256": "460c859985a6f675c559fa18b353ab35f370e5f1f60c9da53275358a1fdbaa29",
            "source": "ossf-package-analysis",
            "import_time": "2026-05-20T17:09:24.656933892Z"
        },
        {
            "import_time": "2026-05-26T05:51:02.113855996Z",
            "versions": [
                "99.99.99"
            ],
            "sha256": "16d9407c815fe2d5593da029ee806d455d15f451d1c84d3cd8d6a0a027821d64",
            "id": "IN-MAL-2026-003648",
            "source": "amazon-inspector",
            "modified_time": "2026-05-20T23:01:10Z"
        },
        {
            "modified_time": "2026-05-20T23:01:11Z",
            "versions": [
                "99.99.99"
            ],
            "sha256": "e68507a976e11c8ed1ed5ff82bbb1f322f86fd89b7700c8ffc05207bc72266db",
            "id": "IN-MAL-2026-003649",
            "source": "amazon-inspector",
            "import_time": "2026-05-26T05:51:02.479612112Z"
        }
    ]
}
References
Credits

Affected packages

npm / uolcs-host-uol-anuncios-fe

Package

Name
uolcs-host-uol-anuncios-fe
View open source insights on deps.dev
Purl
pkg:npm/uolcs-host-uol-anuncios-fe

Affected ranges

Affected versions

99.*
99.99.99

Database specific

indicators 
{
    "domains": [
        "uolci-scan-cd1e5927b0c3-linux.d86r3dv5vn81lvohffp0131g8kdx9mz3c.oast.pro"
    ],
    "evidence_files": [
        {
            "sha256": "bb502812684c6ae5ad7753b8e539b45f4ffeb0af7d58337f621a9f12756a041c",
            "tlsh": "ef012034ca0a4d231ce066a324187987f411cd0709183c1637c3014c5f1da7702bf29e",
            "path": "package.json"
        },
        {
            "sha256": "9995eda9986246d14944e74196fde1f8c5ce9568721eb9cff63795ec59c456cd",
            "tlsh": "d051754526e922301fa150929ccc26c2672fd729526ef990a54d479c428677063577bf",
            "path": "callback.js"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-r/dOYxLrsPWRgErwx4lpP24dkex6fTTdKNKvUetVPH0iPz7WwlsHu/Vz0yAEcy/Zfw2F7oVPA/0FeiIKtTX+lw==",
                "sha1": "4b3426ce48b114b221171e8fc17641508bd7067a"
            },
            "filename": "uolcs-host-uol-anuncios-fe-99.99.99.tgz"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/uolcs-host-uol-anuncios-fe/MAL-2026-4185.json"