MAL-2026-12837

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-tcrm-auth/MAL-2026-12837.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12837
Aliases
  • GHSA-mxqp-2fvr-x99j
Published
2026-08-05T15:01:42Z
Modified
2026-08-06T01:19:57.076137331Z
Summary
Malicious code in bigops-tcrm-auth (npm)
Details

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

Source: amazon-inspector (4f4cc9ef61d16a5c70a1adc9c2ab3acb9e51d650967f02621410285d99efd4a1)

The package's main (index.js) requires./setup on load. setup.js selects a platform-specific payload path, downloads a native binary over HTTPS from Cloudflare Workers subdomains whose hostnames are reassembled at runtime via array-join fragments (e.g. ["oob","-worker.c","f101-adf.workers.d","ev"].join("")), with a DNS-TXT fallback that base64-reassembles the payload from *.dl.wel1.ru resolvers. The downloaded bytes are written to /tmp or %TEMP% under a disguised name (.cache<hex> on POSIX, dotnetdiag<hex>.exe on Windows), chmod 0755'd on POSIX, and detached-spawned via /bin/sh -c or cmd /c start. Sensitive APIs are also fragmented (require("child" + "process"), fs["chmod" + "Sync"]) to evade string matching. A sibling module lib/telemetry.js (3061 lines) presents itself as an "analytics SDK" but reproduces the same dropper primitives at larger scale (HTTPS endpoint rotation, DNS-based service discovery, base64 chunk assembly, chmod 0755, /bin/sh -c spawn). The package advertises itself as an authentication module, a purpose that has no legitimate need to fetch and execute a native binary from obfuscated hosts on import.

Source: ghsa-malware (319036e91f03650512ce6ed0839078969b1209599bbee0982c8414b2ccfd9920)

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": "2026-08-05T15:19:56.821117886Z",
            "modified_time": "2026-08-05T15:01:42Z",
            "sha256": "4f4cc9ef61d16a5c70a1adc9c2ab3acb9e51d650967f02621410285d99efd4a1",
            "id": "IN-MAL-2026-015539",
            "versions": [
                "35.8.5"
            ],
            "source": "amazon-inspector"
        },
        {
            "source": "ghsa-malware",
            "modified_time": "2026-08-05T18:39:32Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "id": "GHSA-mxqp-2fvr-x99j",
            "sha256": "319036e91f03650512ce6ed0839078969b1209599bbee0982c8414b2ccfd9920",
            "import_time": "2026-08-06T00:58:53.417124334Z"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-tcrm-auth

Package

Affected ranges

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

Affected versions

35.*
35.8.5

Database specific

cwes
[
    {
        "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",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-hVPTNueMrrBEyXMlrQQ5eW6tGkF2+/XSNk8nNr8iZfSa6jCtJlwxSiV4mHYVQCAR2OAavJuYa+6ieFzbBRiHbw==",
                "sha1": "a7b3f155cd1d60d6db4bc77429d0b200e33fd48d"
            },
            "filename": "bigops-tcrm-auth-35.8.5.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "setup.js",
            "sha256": "464a086593fd20ec459f471be4e9c9a219a1fce09196746f306ebfeeede21255",
            "tlsh": "feb1b65a167a701d8bb0abf087076419f65af6633780c1d8f76ca9981f7612483b2dfc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "67b0b0b699463b45b55399b226982e031230047b3a64757b19e59cd5d8abfaa0",
            "tlsh": "b2835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
source
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-tcrm-auth/MAL-2026-12837.json"