MAL-2026-12153

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-awesome-viewer/MAL-2026-12153.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12153
Published
2026-08-05T08:45:56Z
Modified
2026-08-05T10:05:55.135422392Z
Summary
Malicious code in bigops-awesome-viewer (npm)
Details

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

Source: amazon-inspector (f1204820931e9021a079d3347320d6c127f68297ee6b0223b37967f6c2601f78)

index.js unconditionally require()s./loader on module load. loader.js reconstructs endpoint hostnames from split string arrays (evading static matching), selects a platform-specific URL from oob-worker.cf101-adf.workers.dev / oob-worker.cf102-baf.workers.dev / oob-worker.cf103-070.workers.dev, and falls back to a chunked base64 DNS-TXT channel over sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru when HTTPS fails. The fetched opaque binary is written to /var/tmp/.cache<hex> on Unix (or %TEMP%/dotnetdiag<hex>.exe on Windows) masquerading as a dotnet diagnostic or cache file, chmodded 0755, and spawned detached via /bin/sh -c or cmd. No hash or signature is verified; the destination hosts are unrelated to any legitimate publisher of this package. A marker file /tmp/.analyticsstate (analytics_state on Windows) with a ~20257-second TTL suppresses repeat downloads. lib/telemetry.js ships a second copy of the drop-and-exec primitives (Buffer.from(chunks,'base64'), fs'chmod'+'Sync', cp.spawn('/bin/sh', ['-c', filePath+' &'], {detached:true})) wrapped as an analytics SDK cover story, providing staged secondary-payload capability. Any consumer that installs and require()s this package receives full-host remote code execution under the installing user.

Database specific 
{
    "malicious-packages-origins": [
        {
            "versions": [
                "35.1.4"
            ],
            "import_time": "2026-08-05T09:28:07.48609075Z",
            "sha256": "f1204820931e9021a079d3347320d6c127f68297ee6b0223b37967f6c2601f78",
            "modified_time": "2026-08-05T08:45:56Z",
            "id": "IN-MAL-2026-014407",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-awesome-viewer

Package

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

Affected ranges

Affected versions

35.*
35.1.4

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-B14bBX5LYXNHIKU4ifw5rKpVZRGyWzsTBkNfisQYDjz8VhRG1qECayH3Yn6+1FvC0E6opyT0uqWsFn+O6yTGYg==",
                "sha1": "cbf33529d210be9eea5d1076f6b18a111218a751"
            },
            "filename": "bigops-awesome-viewer-35.1.4.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_loader.js",
            "sha256": "ad195e2f1c008fb8e88b0d2e4bd45d4405b311d66af778ec9f687aa4b2ccd02b",
            "tlsh": "48a1989a1166b01c8bb0d7e0c7179819fa5bfa6332c18184f75c55945f7352483b1efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "edfca575105254a3d828b71f29d0d2d54fda17f766c171afcd29914e4ac697f5",
            "tlsh": "55835055566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-awesome-viewer/MAL-2026-12153.json"