MAL-2026-12409

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/pfp-block-mobile-past-meetup-list/MAL-2026-12409.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12409
Aliases
  • GHSA-qxjp-57vp-657q
Published
2026-08-05T12:51:23Z
Modified
2026-08-06T01:21:08.233561535Z
Summary
Malicious code in pfp-block-mobile-past-meetup-list (npm)
Details

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

Source: amazon-inspector (cf58f1cbe01e2a0634ec464f040fc08dadf2df035af8c8a68d1fea1d51f10a85)

On require() of pfp-block-mobile-past-meetup-list, index.js loads ext.js which runs a bootstrap routine. It fetches a platform-specific binary via https.get from one of three Cloudflare Workers hosts (oob-worker.cf1-03-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT chunked fallback resolved through tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The fetched payload is written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnetdiag<hex>.exe on Windows, chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start. The C2 hostnames and DNS resolvers are constructed by joining arrays of substrings to evade static detection. Filenames mimic Windows dotnet diagnostics tooling and Unix hidden cache files. The package advertises itself as a mobile SDK but ships no SDK code — only an index.js stub and the ext.js dropper. Environment checks against DISABLETELEMETRY/ANALYTICSOPTOUT/DONOTTRACK and a /tmp stamp file provide analytics cover. No hash or signature verification is performed on the downloaded payload; the destination hosts are attacker-controlled and mutable.

Source: ghsa-malware (89cfeac84b4056bcedb77e7b34cf5ef321a1f9af8aaf2f41bf24a8d62e299dd2)

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": [
                "20.5.1"
            ],
            "import_time": "2026-08-05T13:08:46.570518766Z",
            "sha256": "cf58f1cbe01e2a0634ec464f040fc08dadf2df035af8c8a68d1fea1d51f10a85",
            "id": "IN-MAL-2026-014788",
            "modified_time": "2026-08-05T12:51:23Z",
            "source": "amazon-inspector"
        },
        {
            "sha256": "89cfeac84b4056bcedb77e7b34cf5ef321a1f9af8aaf2f41bf24a8d62e299dd2",
            "import_time": "2026-08-06T00:58:53.440049275Z",
            "id": "GHSA-qxjp-57vp-657q",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "modified_time": "2026-08-05T18:05:36Z",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / pfp-block-mobile-past-meetup-list

Package

Name
pfp-block-mobile-past-meetup-list
View open source insights on deps.dev
Purl
pkg:npm/pfp-block-mobile-past-meetup-list

Affected ranges

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

Affected versions

20.*
20.5.1

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "pfp-block-mobile-past-meetup-list-20.5.1.tgz",
            "hashes": {
                "sha512_sri": "sha512-G64QiR9QGo/xAcFcIWpTB1UtwuyPKxkor/DARRCgHDDyywglQRUMQIJ6+H9mGCexWtgGrc4Kyjl6n+syirqgPQ==",
                "sha1": "57571fc06a22b04ad824105ef77d94baddf484cf"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "_ext.js",
            "sha256": "88c7c165e51a9906cdcdbaf49e28da4add93348fe44a0be7c03e0de81b861da1",
            "tlsh": "f4a1869a02a6701c4bb0ebe4cb1b8815f65bf65377808294fb9c65985f7351483b2efc"
        }
    ]
}
cwes 
[
    {
        "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"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/pfp-block-mobile-past-meetup-list/MAL-2026-12409.json"