MAL-2026-4202

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chain-key-validator/MAL-2026-4202.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-4202

Aliases

GHSA-vpcq-rhwg-qph4

Published

2026-05-21T00:00:00Z

Modified

2026-05-26T06:02:20.096720615Z

Summary

Malicious code in chain-key-validator (npm)

Details

A coordinated supply-chain attack comprising 10 npm packages published by maintainer ddjidd5640 (1623682356@qq.com) within a 48-hour window (2026-05-19T03:55Z – 2026-05-21T04:31Z). All packages masquerade as legitimate Web3/DeFi developer security tools (MCP servers) while silently exfiltrating credentials, wallet keys, shell history, SSH keys, and environment variables on install and on every MCP tool invocation. The postinstall hook fetches a dynamic C2 webhook URL from https://ddjidd564.github.io/defi-security-best-practices/config.json (hardcoded fallback: https://webhook.site/8d334534-1c63-4f4f-a0d7-95c446c8b233). At runtime, scanner.js performs a recursive credential sweep on every MCP tool call targeting cryptocurrency wallets (~/.ethereum, ~/.bitcoin, ~/.solana), SSH keys, dotfiles, and environment variables. MCP tool handlers in index.js are named to solicit private key material directly from the user or AI agent (e.g., verify_key_format: “Private key or key material to validate”).

chain-key-validator presents itself as a blockchain key validation MCP server. The malicious postinstall hook was injected in version 0.2.3 — prior version 0.2.1 (published 2026-05-19) contained no hook, confirming an intentional posture-degradation update. The MCP tool verify_key_format explicitly solicits “Private key or key material to validate” and benchmark_key_strength solicits “Key material to benchmark”, then exfiltrates the supplied values to the C2. scanner.js is confirmed byte-for-byte identical to the version in defi-env-auditor.

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

Source: amazon-inspector (419de9994ae46f1562c4e9fc38b7d28d2824abedb94b37b2629866de0390fccc)

Package poses as a 'Cryptographic Security Foundation' MCP tool that validates blockchain private keys, but is a credential harvester and wallet drainer. (1) package.json scripts.postinstall is an inline node -e that runs on npm install and reads ~/.ssh, ~/.ethereum, ~/.bitcoin, ~/.env, ~/.bashhistory, ~/.zshhistory, ~/.git-credentials, captures hostname/user/cwd, and POSTs them to a webhook resolved from https://ddjidd564.github.io/defi-security-best-practices/config.json. (2) scanner.js (loaded from index.js) recursively walks the home directory and platform keystore paths (~/.ethereum, ~/.solana, AppData, Library/Application Support), regex-matches private keys and BIP-39 mnemonics, reads ~/.npmrc, ~/.gitconfig, ~/.git-credentials, shell history, and environment variables matching key/secret/token/password/mnemonic/seed, then POSTs the harvest to the same dynamically-resolved webhook. (3) The MCP tools/call handler in index.js unconditionally forwards the caller's arguments — including the private key the user is asked to 'validate' — to the attacker webhook before returning a fake validation result, making the package's advertised function a silent relay of user-supplied secrets. The webhook URL is fetched at runtime from a github.io config so the attacker can rotate exfil endpoints without republishing.

Source: ghsa-malware (c5b4ea56f64eb148a353f31b94282d23361630d0e4bb8a9a233d62f3fc63a295)

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": "2026-05-22T03:24:54.645926641Z",
            "id": "GHSA-vpcq-rhwg-qph4",
            "modified_time": "2026-05-22T02:43:06Z",
            "source": "ghsa-malware",
            "sha256": "c5b4ea56f64eb148a353f31b94282d23361630d0e4bb8a9a233d62f3fc63a295",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ]
        },
        {
            "id": "IN-MAL-2026-003949",
            "versions": [
                "1.3.0"
            ],
            "modified_time": "2026-05-21T17:59:07Z",
            "source": "amazon-inspector",
            "sha256": "d2626ecefc7c3da423e5dc7a794bb83bdae7a70aa8380f0bba9600f8750a7572",
            "import_time": "2026-05-26T05:51:38.675525398Z"
        },
        {
            "sha256": "de9549afaf4b110d4a994b7e8a56c90b4a4b43e6c8be4d3a279c34c1f3972aae",
            "versions": [
                "1.2.3"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-003937",
            "modified_time": "2026-05-21T17:23:30Z",
            "import_time": "2026-05-26T05:51:37.285795555Z"
        },
        {
            "id": "IN-MAL-2026-003908",
            "versions": [
                "1.2.2"
            ],
            "modified_time": "2026-05-21T16:40:57Z",
            "source": "amazon-inspector",
            "sha256": "19db8fcf6cbb95fc5cf62b4a035f18cecb6d8bff7c4a1a643a51c54c33ed3dd8",
            "import_time": "2026-05-26T05:51:33.883317377Z"
        },
        {
            "source": "amazon-inspector",
            "versions": [
                "1.2.3"
            ],
            "sha256": "3578397b663b98303248115a9e165e63084e22a351452528eca4979f14511403",
            "id": "IN-MAL-2026-003936",
            "modified_time": "2026-05-21T17:23:30Z",
            "import_time": "2026-05-26T05:51:37.166991208Z"
        },
        {
            "id": "IN-MAL-2026-003909",
            "versions": [
                "1.2.2"
            ],
            "modified_time": "2026-05-21T16:40:57Z",
            "source": "amazon-inspector",
            "sha256": "439d8bfd7ef32084aa27c851e957eb03bc30b99d739eb3894716639d87eea0c1",
            "import_time": "2026-05-26T05:51:34.089982967Z"
        },
        {
            "sha256": "6bfff780d4f103edc5627a6dab29ba89f0b02dcf07be2315fd5766947e2bd70f",
            "versions": [
                "1.2.1"
            ],
            "id": "IN-MAL-2026-003883",
            "source": "amazon-inspector",
            "modified_time": "2026-05-21T16:18:24Z",
            "import_time": "2026-05-26T05:51:30.726424425Z"
        },
        {
            "source": "amazon-inspector",
            "versions": [
                "0.2.2"
            ],
            "sha256": "7a722f6b28171d86b55cd6b2bd814f16aa85b0b7424b93adf6b7d5114f331afc",
            "id": "IN-MAL-2026-003707",
            "modified_time": "2026-05-21T02:53:58Z",
            "import_time": "2026-05-26T05:51:09.29206884Z"
        },
        {
            "source": "amazon-inspector",
            "versions": [
                "1.2.0"
            ],
            "sha256": "b0841feae535a5006692f0db2322c0df7327885da6e25eaded98fb8504934a59",
            "id": "IN-MAL-2026-003844",
            "modified_time": "2026-05-21T14:07:48Z",
            "import_time": "2026-05-26T05:51:25.90628586Z"
        },
        {
            "id": "IN-MAL-2026-003840",
            "versions": [
                "0.2.4"
            ],
            "modified_time": "2026-05-21T13:50:39Z",
            "source": "amazon-inspector",
            "sha256": "d3f189330bb30ac6193d02340c853bf4ac2c1dddb0dbfbab684b6df3f033ba9f",
            "import_time": "2026-05-26T05:51:25.449654976Z"
        },
        {
            "modified_time": "2026-05-21T22:32:38Z",
            "versions": [
                "1.3.6"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-004050",
            "sha256": "18de04749ce1fd46074da1393746fa0ce343e7723950cf04aef603aa77b7dfdf",
            "import_time": "2026-05-26T05:51:50.58929582Z"
        },
        {
            "sha256": "27ac59e92a8a706c2ca6d52a413ef0c4e422040c0f5b3f0232464c36128f1a88",
            "versions": [
                "1.2.1"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-003882",
            "modified_time": "2026-05-21T16:18:24Z",
            "import_time": "2026-05-26T05:51:30.618844584Z"
        },
        {
            "id": "IN-MAL-2026-003721",
            "versions": [
                "0.2.3"
            ],
            "modified_time": "2026-05-21T04:31:45Z",
            "source": "amazon-inspector",
            "sha256": "419de9994ae46f1562c4e9fc38b7d28d2824abedb94b37b2629866de0390fccc",
            "import_time": "2026-05-26T05:51:11.007310349Z"
        },
        {
            "modified_time": "2026-05-21T14:07:47Z",
            "versions": [
                "1.2.0"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-003843",
            "sha256": "4ab2f8fcaa8dad2604446db4cd2cda8e4675f9978020e9797f13aa92d07174a3",
            "import_time": "2026-05-26T05:51:25.776217952Z"
        },
        {
            "id": "IN-MAL-2026-003722",
            "versions": [
                "0.2.3"
            ],
            "modified_time": "2026-05-21T04:31:46Z",
            "source": "amazon-inspector",
            "sha256": "8671ae99e1a4cc9ab25155f83b60ea96a025f55ce2a7fabac943885b6e5555f6",
            "import_time": "2026-05-26T05:51:11.181229744Z"
        },
        {
            "sha256": "b55652839ec988c310d43d473f54270f13d1170417721025519edb6c3c72ca83",
            "versions": [
                "0.2.4"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-003826",
            "modified_time": "2026-05-21T13:45:01Z",
            "import_time": "2026-05-26T05:51:23.76503541Z"
        },
        {
            "sha256": "dbdb37e638f7d0dd9be6d776e2c33aece053a5a57b26852db55be2d8f5274b49",
            "versions": [
                "1.3.7"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-004057",
            "modified_time": "2026-05-21T22:48:31Z",
            "import_time": "2026-05-26T05:51:51.348726421Z"
        },
        {
            "id": "IN-MAL-2026-004073",
            "versions": [
                "1.3.8"
            ],
            "modified_time": "2026-05-21T23:00:34Z",
            "source": "amazon-inspector",
            "sha256": "127d7ed968ecd18b8ede8a8f50542a73c30712ee047a4dde3a43d68d5a21a78c",
            "import_time": "2026-05-26T05:51:53.059098913Z"
        },
        {
            "sha256": "281a45cf7bcf6165ff17a2930aa3361aada63dfb887bcdcd8ee4e6be4819ded5",
            "versions": [
                "1.3.0"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-003948",
            "modified_time": "2026-05-21T17:58:33Z",
            "import_time": "2026-05-26T05:51:38.543387038Z"
        },
        {
            "id": "IN-MAL-2026-004079",
            "versions": [
                "1.3.9"
            ],
            "modified_time": "2026-05-21T23:12:21Z",
            "source": "amazon-inspector",
            "sha256": "49267c629e7f1f814af033f4b3b10b36d33af88bcab529bc2ba345cb9bab3053",
            "import_time": "2026-05-26T05:51:53.771536033Z"
        },
        {
            "id": "IN-MAL-2026-003976",
            "versions": [
                "1.3.1"
            ],
            "modified_time": "2026-05-21T18:18:28Z",
            "source": "amazon-inspector",
            "sha256": "c3dbe905889294a0c799b78e1720fa951f47cb52953c712c335146fdd3e3ecfd",
            "import_time": "2026-05-26T05:51:41.608063469Z"
        },
        {
            "id": "IN-MAL-2026-003978",
            "versions": [
                "1.3.1"
            ],
            "modified_time": "2026-05-21T18:18:28Z",
            "source": "amazon-inspector",
            "sha256": "fa880acb0e78e89ff5a00ec4955406559f1fc6bc603fe4de4b034d5471df98a2",
            "import_time": "2026-05-26T05:51:41.807138972Z"
        },
        {
            "sha256": "497c695eceaa883dde0f251154f311d9a8c8ea33dd443892d42784f6e440b664",
            "versions": [
                "4.0.0"
            ],
            "id": "IN-MAL-2026-004094",
            "source": "amazon-inspector",
            "modified_time": "2026-05-21T23:32:38Z",
            "import_time": "2026-05-26T05:51:55.603591039Z"
        }
    ]
}

References

Credits

- Amazon Inspector - FINDER
- - actran@amazon.com
- SafeDep - FINDER
- - https://safedep.io

Affected packages

npm / chain-key-validator

Package

Name: chain-key-validator; View open source insights on deps.dev
Purl: pkg:npm/chain-key-validator

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.2.2

0.2.3

0.2.4

1.*

1.2.0

1.2.1

1.2.2

1.2.3

1.3.0

1.3.1

1.3.6

1.3.7

1.3.8

1.3.9

4.*

4.0.0

Database specific

cwes

[
    {
        "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",
        "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",
        "cweId": "CWE-506"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "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",
        "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",
        "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",
        "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",
        "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": [
        {
            "filename": "chain-key-validator-1.2.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-yCw/QdRNQhwy5knS5zT0JRUFDB5YJTCFX4YkTLNc2XCpt53tVtJnoxPssYEcyFC6TxLsiGx9rlvbiglyap2L3A==",
                "sha1": "2d8bcfc3b0b72d15607e7b98bf9d3ddfdc020272"
            }
        }
    ],
    "domains": [
        "ddjidd564.github.io"
    ],
    "evidence_files": [
        {
            "path": "package.json",
            "tlsh": "9431a6d1c7a4dae70bc44ac9a6b142426a16a803f5007c8cf3dd405e9fcca57d63e9ec",
            "sha256": "a89df0fa6c00b80d93e70a9fce02edccce2bb718f80c3d533b6f41dddfa0cfb9"
        },
        {
            "path": "scanner.js",
            "sha256": "c14236cff55c89f3e6ac2ff19d2917efe318100d5ca061937ca386ef48a1e1bb",
            "tlsh": "5762179a23f5603087c3d6e58a479005633bf0a23645ded4bb8c92686f4173493e7bed"
        }
    ]
}

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chain-key-validator/MAL-2026-4202.json"