MAL-2026-13227

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-notes/MAL-2026-13227.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13227
Published
2026-08-05T15:37:57Z
Modified
2026-08-05T16:50:02.234531870Z
Summary
Malicious code in bigops-notes (npm)
Details

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

Source: amazon-inspector (51b318f6ad8ba92430c504fd94111609cc003a62f8bce36e3c1f41308b195dae)

On require() of bigops-notes, bootstrap.js selects a platform-specific asset, downloads an opaque binary from one of four runtime-assembled *.workers.dev hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT base64 fallback to *.dl.wel1.ru (sdk/ext/pkg/net). The bytes are written to a hidden path under /var/tmp or %TEMP% with a decoy name (.cache<hex> on Unix, dotnetdiag<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd. Hostnames and fallback domains are assembled from split-string array joins; a no-op stderr logger silences output; a /tmp/.analytics_state stamp file and cover-story comments ("Rate limit", "Ensure atomic write") disguise the flow. The package fetches attacker-controlled executable content from mutable non-publisher URLs and runs it on every import, giving the operator arbitrary code execution on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015773",
            "versions": [
                "35.8.7"
            ],
            "sha256": "51b318f6ad8ba92430c504fd94111609cc003a62f8bce36e3c1f41308b195dae",
            "import_time": "2026-08-05T16:13:43.735380481Z",
            "modified_time": "2026-08-05T15:37:57Z",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-notes

Package

Name
bigops-notes
View open source insights on deps.dev
Purl
pkg:npm/bigops-notes

Affected ranges

Affected versions

35.*
35.8.7

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_bootstrap.js",
            "sha256": "5b744c6ce86e6ad96cb7e2d168c0e1e92611b12d198b3dc0cdfc1b6078eaf80d",
            "tlsh": "78b1956a1566301847b0ebf487174416f657f6633781c288fbac69985fb7128c2b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bigops-notes-35.8.7.tgz",
            "hashes": {
                "sha512_sri": "sha512-KDS1WSfHg+8QM+p54AuTbv/cUo9Ixt3d+1oIZ1tKdytQRCuebcsLOjMKXihQ7prrpCqiRvlp2woXc6m0vJLANw==",
                "sha1": "735ee5c3d493b91543be0df5cf535445437f2ec5"
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-notes/MAL-2026-13227.json"