MAL-2026-2899

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-use-chains/MAL-2026-2899.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-2899

Published

2026-04-15T22:05:03Z

Modified

2026-07-09T09:32:35.284337519Z

Summary

Malicious code in chai-use-chains (npm)

Details

chai-use-chains is a malicious npm package that when imported downloads a C2 dropper from https://jsonkeeper[.]com/b/FAWPU and executes it (similar to malware in to chai-await-test).

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

Source: amazon-inspector (82cb30ff865bcb0071b1861dd09c9b8e770861b76d263b30e42aafd54626c39b)

The package chai-use-chains was found to contain malicious code.

Database specific

{
    "malicious-packages-origins": [
        {
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "import_time": "2026-04-23T20:49:07.40443128Z",
            "sha256": "82cb30ff865bcb0071b1861dd09c9b8e770861b76d263b30e42aafd54626c39b",
            "modified_time": "2026-04-23T20:43:56Z",
            "source": "amazon-inspector"
        },
        {
            "import_time": "2026-07-09T09:16:23.881255636Z",
            "id": "RLMA-2026-05013",
            "sha256": "e4e561c5119981ab0a4531c0538ae3eae922ea8830a4360a7f0a4512dd09ab8b",
            "modified_time": "2026-07-07T12:43:51Z",
            "source": "reversing-labs",
            "versions": [
                "1.2.6",
                "1.2.7"
            ]
        }
    ],
    "iocs": {
        "urls": [
            "https://jsonkeeper.com/b/FAWPU"
        ]
    }
}

References

https://www.indece.com/en-US/blog/7df041ba-feb1-4d87-918b-7fc2c709d805

Credits

- Amazon Inspector - FINDER
- - actran@amazon.com
- ReversingLabs - FINDER
- - https://www.reversinglabs.com
- indece - FINDER
- - https://indece.com

Affected packages

npm / chai-use-chains

Package

Name: chai-use-chains; View open source insights on deps.dev
Purl: pkg:npm/chai-use-chains

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.2.6

1.2.7

Database specific

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-use-chains/MAL-2026-2899.json"