MAL-2026-12831

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-alerts-widget/MAL-2026-12831.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12831
Aliases
  • GHSA-g38r-p346-f34v
Published
2026-08-05T15:03:19Z
Modified
2026-08-06T01:19:50.641891134Z
Summary
Malicious code in bigops-alerts-widget (npm)
Details

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

Source: amazon-inspector (d1ece35b981e6725d807e3bfe7da2bc7e2129bb49fa6f656866ace6f67079284)

On require() of bigops-alerts-widget, vendor.js selects a payload path based on process.platform and process.arch, downloads an opaque binary from one of several anonymous Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to /tmp or %TEMP% under disguised filenames (.cache<hex>, dotnetdiag<hex>.exe), chmods it 0755, and spawns it detached via spawn('/bin/sh') or spawn('cmd'). Destination hostnames are assembled from split character arrays via Array.join to avoid appearing as plain strings. If the primary fetch fails, a fallback path issues multiple DNS TXT queries against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, concatenates the returned records, and base64-decodes them into an executable buffer that is then run the same way. Import-time execution of an attacker-controlled binary from anonymous infrastructure, combined with string-obfuscation of the destinations and a DNS-TXT covert channel, gives whoever published this package remote code execution on the installer's host.

Source: ghsa-malware (cfaa41ff13fda83cb95d5be208ccb338aa96034cbe2fe812121242cd1730143d)

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": [
        {
            "import_time": "2026-08-05T15:19:57.497603072Z",
            "modified_time": "2026-08-05T15:03:19Z",
            "sha256": "d1ece35b981e6725d807e3bfe7da2bc7e2129bb49fa6f656866ace6f67079284",
            "id": "IN-MAL-2026-015549",
            "versions": [
                "35.8.3"
            ],
            "source": "amazon-inspector"
        },
        {
            "import_time": "2026-08-06T00:58:53.369458895Z",
            "modified_time": "2026-08-05T18:06:37Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "id": "GHSA-g38r-p346-f34v",
            "sha256": "cfaa41ff13fda83cb95d5be208ccb338aa96034cbe2fe812121242cd1730143d",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-alerts-widget

Package

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

Affected ranges

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

Affected versions

35.*
35.8.3

Database specific

cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-Jr7sKiR43kSqJYXqzbTIUQMq1cS7iD3cUeTikXC7JiBacO5AfesZt0hXt+cDw2ZyGoiLdsFrTjGmhHz+A8hscg==",
                "sha1": "dae63398a8b48f89f4187df990a2059076031101"
            },
            "filename": "bigops-alerts-widget-35.8.3.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_vendor.js",
            "sha256": "c28e0661c18c5e13e6303f564793cc52443f0e5e712b2ef39838d1af0e278932",
            "tlsh": "cfa1755a05aa70188bb0d7e0c6174416f75af6633781c2c4fb9ca9885f735248372efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-alerts-widget/MAL-2026-12831.json"