mal-2026-15625
Vulnerability from ossf_malicious_packages
Published
2026-08-31 15:40
Modified
2026-09-03 06:32
Summary
Malicious code in evilpostinstall (npm)
Details
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (846e500b06f58769a2cb833be8e726ab1db04b327f4c614da6642eb46ae7dfe5)
The package's postinstall lifecycle hook pipes the output of env through nc to a host reconstructed at install time from the package version string via cut -b 2-4 and cut -b 5-. For version 4127000.0.1 the destination decodes to 127.0.0.1:888; the sibling artifact evilpostinstall-192.168.1.100.tgz uses the same slicing scheme to target 192.168.1.100. On npm install, the full installer environment - including any CI secrets, tokens, and API keys present in environment variables - is transmitted to the reconstructed host over TCP port 888. package.json also declares a self-referencing dependency evilpostinstall: ^4192168.1.100, whose version field encodes a second destination IP under the same scheme, causing npm to resolve and install an additional package instance whose own postinstall repeats the exfiltration against that address. The destination is deliberately hidden from static scanners by being reconstructed from the version field rather than written as an IP literal, and no source files are shipped - the manifest itself is the payload.
Source: ossf-package-analysis (c4f0004a363677a7dc0429c4cf4bacafcd3bbdab0c95e1e7851d44b543d7e486)
The OpenSSF Package Analysis project identified 'evilpostinstall' @ 4127000.0.1 (npm) as malicious.
It is considered malicious because:
- The package executes one or more commands associated with malicious behavior.
CWE
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"affected": [
{
"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"
},
{
"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",
"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"
}
],
"indicators": {
"evidence_files": [
{
"path": "package.json",
"sha256": "cde24c47fbf00267f9a178addb878e822d68bdd9162b69df8b7343e377f65ea3",
"tlsh": "b9f027290460937328c5063e180bb8679f712f1f6516fa84919f126c02993be5eb633d"
}
],
"package_integrity": [
{
"filename": "evilpostinstall-49.13.4074225.tgz",
"hashes": {
"sha1": "8ac49965435ab8946ca081904bd7dd836e180ebb",
"sha512_sri": "sha512-Rx/moK66dCS+mTbXVX2RZIAKX4rzaSQY3glsSfvdvjrbMFNdE4vLjJXZkjKBOres+wvK0VMUroSxlxnwdLxKcA=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "evilpostinstall"
},
"versions": [
"49.13.4074225",
"4127000.0.1",
"0.2.0",
"0.6.0",
"0.4.0",
"0.3.0",
"0.5.0",
"0.9.1",
"0.9.3",
"0.9.2",
"0.9.0",
"4192168.1.100",
"0.7.0",
"0.7.1",
"0.8.0"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
},
{
"contact": [
"https://github.com/ossf/package-analysis",
"https://openssf.slack.com/channels/package_analysis"
],
"name": "OpenSSF: Package Analysis",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-019308",
"import_time": "2026-08-31T18:22:29.642257236Z",
"modified_time": "2026-08-31T18:02:58Z",
"sha256": "64ca497d518a333a571b7f978e9ce5a5f4a87649d462eb16480a258aa33b15c2",
"source": "amazon-inspector",
"versions": [
"49.13.4074225"
]
},
{
"id": "IN-MAL-2026-019296",
"import_time": "2026-08-31T18:22:29.150046979Z",
"modified_time": "2026-08-31T18:01:10Z",
"sha256": "846e500b06f58769a2cb833be8e726ab1db04b327f4c614da6642eb46ae7dfe5",
"source": "amazon-inspector",
"versions": [
"4127000.0.1"
]
},
{
"import_time": "2026-09-01T00:57:09.116943582Z",
"modified_time": "2026-08-31T18:05:48Z",
"sha256": "29ef31366374537cb5c06da575916f1a0a0494e63df3ce4ea9d06a685f4f3bb1",
"source": "ossf-package-analysis",
"versions": [
"0.2.0"
]
},
{
"import_time": "2026-09-01T00:57:09.187843174Z",
"modified_time": "2026-08-31T18:25:54Z",
"sha256": "63c1e371381b8007f9f6c3347d20061d0d2e4d391ad366c6478c153056f49e32",
"source": "ossf-package-analysis",
"versions": [
"0.6.0"
]
},
{
"import_time": "2026-09-01T00:57:09.042147024Z",
"modified_time": "2026-08-31T15:40:53Z",
"sha256": "c4f0004a363677a7dc0429c4cf4bacafcd3bbdab0c95e1e7851d44b543d7e486",
"source": "ossf-package-analysis",
"versions": [
"4127000.0.1"
]
},
{
"id": "IN-MAL-2026-019322",
"import_time": "2026-09-02T02:44:33.494406283Z",
"modified_time": "2026-09-02T02:19:28Z",
"sha256": "162c9883c327802cb1876ddca28f93dfabc97256f9b23e16151c3fb7f73ad59c",
"source": "amazon-inspector",
"versions": [
"0.2.0"
]
},
{
"id": "IN-MAL-2026-019319",
"import_time": "2026-09-02T02:44:33.118077792Z",
"modified_time": "2026-09-02T02:18:57Z",
"sha256": "664bbacd7f9ee0dd7dd6f667d05327beb7d709c72d19e242ccd50cf2995363fe",
"source": "amazon-inspector",
"versions": [
"0.6.0"
]
},
{
"id": "IN-MAL-2026-019330",
"import_time": "2026-09-02T04:23:33.585244909Z",
"modified_time": "2026-09-02T03:57:58Z",
"sha256": "138e359294e9f248e99ec42e1a3ac5d75ed26f1f11d82395448896776fb3012f",
"source": "amazon-inspector",
"versions": [
"0.4.0"
]
},
{
"id": "IN-MAL-2026-019329",
"import_time": "2026-09-02T04:23:33.496941262Z",
"modified_time": "2026-09-02T03:57:49Z",
"sha256": "95ca72ee648c6a3eec3673b5b6512ffee68681f09bfd29a7e4b441555747ce33",
"source": "amazon-inspector",
"versions": [
"0.3.0"
]
},
{
"id": "IN-MAL-2026-019334",
"import_time": "2026-09-02T04:23:33.901377707Z",
"modified_time": "2026-09-02T03:58:34Z",
"sha256": "cd662085adac5d58c8c0026d9dc08bc7b5752504895a93cb5c62e23e110622c1",
"source": "amazon-inspector",
"versions": [
"0.5.0"
]
},
{
"import_time": "2026-09-02T10:40:16.383151078Z",
"modified_time": "2026-09-02T10:36:26Z",
"sha256": "522a8d833eb33b48e74110ea8a10fcfaba028b1187262cc7126e4205b39037e3",
"source": "ossf-package-analysis",
"versions": [
"0.9.1"
]
},
{
"id": "IN-MAL-2026-019349",
"import_time": "2026-09-02T22:16:58.994382952Z",
"modified_time": "2026-09-02T22:08:26Z",
"sha256": "4b20fe1ded30ae78a214b9c52a72d0bc0819be9d1a20daa99e90386b42aa61d2",
"source": "amazon-inspector",
"versions": [
"0.9.3"
]
},
{
"id": "IN-MAL-2026-019345",
"import_time": "2026-09-02T22:16:58.862862272Z",
"modified_time": "2026-09-02T22:07:48Z",
"sha256": "65ae3f9a0bd4c69e8db063acc53a87217ddd143f9aa592585c6a95fdfecd34c4",
"source": "amazon-inspector",
"versions": [
"0.9.2"
]
},
{
"id": "IN-MAL-2026-019346",
"import_time": "2026-09-02T22:16:58.892752411Z",
"modified_time": "2026-09-02T22:07:56Z",
"sha256": "73691a85ba0e4f43ea5cfc286f385fcd14b3bcd1727010ff42068fcd1f9c01a6",
"source": "amazon-inspector",
"versions": [
"0.9.0"
]
},
{
"id": "IN-MAL-2026-019351",
"import_time": "2026-09-02T22:16:59.05978804Z",
"modified_time": "2026-09-02T22:08:43Z",
"sha256": "9acf92bee5a1d538c7f5405a70c63404af9ae48080d3fcd60c3dfd3ad2b64efa",
"source": "amazon-inspector",
"versions": [
"4192168.1.100"
]
},
{
"id": "IN-MAL-2026-019352",
"import_time": "2026-09-02T22:16:59.093999015Z",
"modified_time": "2026-09-02T22:08:51Z",
"sha256": "b780ef01474e493df4c823c0e08fbfdcf5e06e8bddbc1b56a4ee6ee79c73f252",
"source": "amazon-inspector",
"versions": [
"0.7.0"
]
},
{
"id": "IN-MAL-2026-019347",
"import_time": "2026-09-02T22:16:58.927063507Z",
"modified_time": "2026-09-02T22:08:06Z",
"sha256": "019d886aede56107561e3d40e7cad4d138c3f5e7be05dada919968d823aa7473",
"source": "amazon-inspector",
"versions": [
"0.7.1"
]
},
{
"id": "IN-MAL-2026-019348",
"import_time": "2026-09-02T22:16:58.960645019Z",
"modified_time": "2026-09-02T22:08:15Z",
"sha256": "1b5481d894e337c83071b89547178d48ab832626484249778fd5162d3afbad1d",
"source": "amazon-inspector",
"versions": [
"0.9.1"
]
},
{
"id": "IN-MAL-2026-019350",
"import_time": "2026-09-02T22:16:59.027972706Z",
"modified_time": "2026-09-02T22:08:35Z",
"sha256": "4374e51254a1232b0612bd5ef4245d9f8592444f9d8aed27e43a11b318b5d503",
"source": "amazon-inspector",
"versions": [
"0.8.0"
]
},
{
"import_time": "2026-09-03T06:30:16.622000879Z",
"modified_time": "2026-09-02T10:25:44Z",
"sha256": "b57b7284098951d334af5c20e3b3547fa6955796dab3a60c7497f5ab288ee213",
"source": "ossf-package-analysis",
"versions": [
"0.7.1"
]
},
{
"import_time": "2026-09-03T06:30:16.490719789Z",
"modified_time": "2026-09-02T10:37:47Z",
"sha256": "dd78cb8b537b7374bf4c7daafa55f7814349edea66c2761b5cfdf2bfaf892f2d",
"source": "ossf-package-analysis",
"versions": [
"0.9.0"
]
},
{
"import_time": "2026-09-03T06:30:16.743216828Z",
"modified_time": "2026-09-02T09:51:51Z",
"sha256": "687aefa0d702353373b58f2a1d0fd6b25bf4bfe7d6824670a1edf5a35cce2697",
"source": "ossf-package-analysis",
"versions": [
"0.7.0"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (846e500b06f58769a2cb833be8e726ab1db04b327f4c614da6642eb46ae7dfe5)\nThe package\u0027s postinstall lifecycle hook pipes the output of `env` through `nc` to a host reconstructed at install time from the package version string via `cut -b 2-4` and `cut -b 5-`. For version 4127000.0.1 the destination decodes to 127.0.0.1:888; the sibling artifact evilpostinstall-192.168.1.100.tgz uses the same slicing scheme to target 192.168.1.100. On `npm install`, the full installer environment - including any CI secrets, tokens, and API keys present in environment variables - is transmitted to the reconstructed host over TCP port 888. package.json also declares a self-referencing dependency `evilpostinstall: ^4192168.1.100`, whose version field encodes a second destination IP under the same scheme, causing npm to resolve and install an additional package instance whose own postinstall repeats the exfiltration against that address. The destination is deliberately hidden from static scanners by being reconstructed from the version field rather than written as an IP literal, and no source files are shipped - the manifest itself is the payload.\n\n## Source: ossf-package-analysis (c4f0004a363677a7dc0429c4cf4bacafcd3bbdab0c95e1e7851d44b543d7e486)\nThe OpenSSF Package Analysis project identified \u0027evilpostinstall\u0027 @ 4127000.0.1 (npm) as malicious.\n\nIt is considered malicious because:\n\n- The package executes one or more commands associated with malicious behavior.\n",
"id": "MAL-2026-15625",
"modified": "2026-09-03T06:32:13.160416480Z",
"published": "2026-08-31T15:40:53Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/49.13.4074225"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/4127000.0.1"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.2.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.6.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.4.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.3.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.5.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.9.3"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.9.2"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.9.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/4192168.1.100"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.7.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.7.1"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.9.1"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/evilpostinstall/v/0.8.0"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in evilpostinstall (npm)"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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