MAL-2026-11485

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-date-formatter-util-2/MAL-2026-11485.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-11485
Aliases
  • GHSA-q43f-5xj6-8v63
Published
2026-08-02T17:09:40Z
Modified
2026-08-04T22:05:15Z
Summary
Malicious code in simple-date-formatter-util-2 (npm)
Details

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

Source: amazon-inspector (e2102f256bd17b2a80b2157371bee5a3cc1d9c49484aaef694a094218c2a7bac)

The package.json postinstall script runs on every npm install and uses curl to probe cloud instance-metadata services (AWS 169.254.169.254, Alibaba 100.100.100.200, Tencent metadata.tencentyun.com, 169.254.0.23), writes their responses to /tmp, and POSTs the concatenated contents together with a listing of /data/ to an attacker-controlled OAST collector at ycrqyyjhwepdmhjifyccxss1hrks8lcd2.oast.fun. Cloud IMDS endpoints return role credentials for the installer's instance, so the beacon exfiltrates cloud credentials on install. The tarball also ships a postinstall.js that enumerates the installer's ~/.ssh directory and POSTs the collected data with username and platform fields to https://124.221.154.135/post. The package advertises date-formatting utility functionality; none of the observed behavior relates to that purpose.

Source: ghsa-malware (6e2619c38c0a6e4c2bf346194ff3de102d18ef08ddd7c864c4470d17d62837b8)

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": [
        {
            "id": "GHSA-q43f-5xj6-8v63",
            "import_time": "2026-08-02T22:41:05.087804Z",
            "modified_time": "2026-08-02T17:09:44Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "6e2619c38c0a6e4c2bf346194ff3de102d18ef08ddd7c864c4470d17d62837b8",
            "source": "ghsa-malware"
        },
        {
            "id": "IN-MAL-2026-011019",
            "import_time": "2026-08-04T21:33:13.883326107Z",
            "modified_time": "2026-08-04T21:20:37Z",
            "sha256": "e2102f256bd17b2a80b2157371bee5a3cc1d9c49484aaef694a094218c2a7bac",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / simple-date-formatter-util-2

Package

Name
simple-date-formatter-util-2
View open source insights on deps.dev
Purl
pkg:npm/simple-date-formatter-util-2

Affected ranges

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

Affected versions

1.*
1.0.0

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"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "package.json",
            "sha256": "5b5c84da6cf0c8b60ca267e4c6ec6cdbaeccf7b2f6906ed2684819f2ec7ef2aa",
            "tlsh": "120170997a11b9721f9a8f69d269030a7500f94b1bd00a05d5e62cf04d8a9a1a069f09"
        },
        {
            "path": "postinstall.js",
            "sha256": "f2be6940c08d36a7f1ce83d5fe16fefd8c14edda5d124e0f6406725beb5020ef",
            "tlsh": "273165d558f9cd3007778685639b91263102fe13650ee940f3c807a51fe9a5449f2dee"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-date-formatter-util-2/MAL-2026-11485.json"