MAL-2026-12853

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-utils/MAL-2026-12853.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12853
Aliases
  • GHSA-m9jg-f26q-5hmq
Published
2026-08-05T14:59:18Z
Modified
2026-08-26T01:21:08Z
Summary
Malicious code in bigops-utils (npm)
Details

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

Source: amazon-inspector (36dcb322eace39209bb0092ab7ea7c658481887a48eff948f116bfb7909ec131)

Loading the package's main entry point auto-invokes helpers.js init(), which downloads an OS-specific binary from obfuscated Cloudflare Workers subdomains (hostnames assembled at runtime from split-string arrays such as MIRRORS=['oob-worker.cf102-baf.w','orke','rs.','de','v'].join('')) with a DNS-TXT chunked fallback that reassembles base64 chunks from TXT records under *.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under deceptive names ('.cache', 'dotnet_diag.exe'), chmod'd 0755, and detached-spawned via spawn('/bin/sh', ['-c', fp+' &'], {detached:true}) or cmd.exe /c start /b. No hash or signature verification is performed and the destinations are not tied to any advertised publisher. Sibling lib/telemetry.js uses dynamic API construction (require('child_'+'process'), fs['chmod'+'Sync']) to further evade static analysis. The behavior is framed as 'analytics/telemetry' but is an import-time remote-code dropper.

Source: ghsa-malware (d3fc53a06ce362be9e43be78d6942587d248874731cde0ef7cd156811df16c12)

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": "IN-MAL-2026-015523",
            "import_time": "2026-08-05T15:19:56.011535528Z",
            "modified_time": "2026-08-05T14:59:18Z",
            "sha256": "36dcb322eace39209bb0092ab7ea7c658481887a48eff948f116bfb7909ec131",
            "source": "amazon-inspector",
            "versions": [
                "35.4.8"
            ]
        },
        {
            "id": "GHSA-m9jg-f26q-5hmq",
            "import_time": "2026-08-25T16:26:05.044926869Z",
            "modified_time": "2026-08-25T15:56:10Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "d3fc53a06ce362be9e43be78d6942587d248874731cde0ef7cd156811df16c12",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-utils

Package

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

Affected ranges

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

Affected versions

35.*
35.4.8

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": "_helpers.js",
            "sha256": "1a8da11952bcec274c2fd7cc9ae8dfdb8e3ab2ae48bc5b42a06ea9cc62261903",
            "tlsh": "49b1986a156670184bb0d7e4c7176415f65ae5637380c2a4fb9ca9d81fb312483b3efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bigops-utils-35.4.8.tgz",
            "hashes": {
                "sha1": "b222b6c71700676b311eff358b2cfd2f2cb4208a",
                "sha512_sri": "sha512-j00jKChS6tLfhTp062RagJh2pGKBnH9jjvWAwWyh9P+L2MxNC9s4aXsip+AutpKle5uwz4ISbCS8Hz6Tjn1Rhg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-utils/MAL-2026-12853.json"