mal-2026-14347
Vulnerability from ossf_malicious_packages
Published
2026-08-21 04:21
Modified
2026-08-21 04:50
Summary
Malicious code in mcq-session (npm)
Details
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (1acf694ae0258defc54c414980c5f8512b7055e69630ede15a8bfb37d2005b9b)
On any require()/import of mcq-session, the main module runs a top-level async IIFE that reads a file at../../../../public/logo.ico (a path escaping the package root into a host application's public assets), DES-decrypts the bytes with a hardcoded password 'bf497c0b9cee' using multiple CryptoJS decode formats, and pipes the decrypted plaintext into a detached, unref'd 'node' subprocess via stdin. The decrypted content is treated as executable JavaScript with no signature check, integrity verification, or user gate. The loader is disguised behind cover-story identifiers ('readLogoIco', 'ThetaSDK initialization'). The symmetric key ships alongside the loader, so the encryption serves only to defeat static inspection of the staged payload. The out-of-package path indicates the payload is dropped separately alongside a host application, making the on-disk blob attacker-controlled from the installer's perspective.
CWE
Credits
{
"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"
}
],
"indicators": {
"evidence_files": [
{
"path": "src/api/session-api.js",
"sha256": "506388a1987e85f27591742a70b35b4ce54a8c5d3db48fb53e16a6807f1cdb1b",
"tlsh": "d4c1f15c2c03e12757f0e3bd4e32c454eb735a913b119aa1faac77a12f994d06532ed8"
}
],
"package_integrity": [
{
"filename": "mcq-session-1.0.4.tgz",
"hashes": {
"sha1": "243e9dc07bdd7e6f225f374dc14483dd00fe9dc6",
"sha512_sri": "sha512-kOEO+ILaWj6SwSgGMMlRjjiGtuEWlc3t9x+k0WefuvIg1CGJe4FxPkZuXY6t3Md+HQFC2FIk0ifCTMnY9dWhkg=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "mcq-session"
},
"versions": [
"1.0.4",
"1.0.3"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-018498",
"import_time": "2026-08-21T04:48:53.341858767Z",
"modified_time": "2026-08-21T04:21:28Z",
"sha256": "1acf694ae0258defc54c414980c5f8512b7055e69630ede15a8bfb37d2005b9b",
"source": "amazon-inspector",
"versions": [
"1.0.4"
]
},
{
"id": "IN-MAL-2026-018499",
"import_time": "2026-08-21T04:48:53.386731619Z",
"modified_time": "2026-08-21T04:21:37Z",
"sha256": "fe84a62bd4f46ea4176c612c777b12e5e0887596f69d69bfa91c2fcec43e08a6",
"source": "amazon-inspector",
"versions": [
"1.0.3"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (1acf694ae0258defc54c414980c5f8512b7055e69630ede15a8bfb37d2005b9b)\nOn any require()/import of mcq-session, the main module runs a top-level async IIFE that reads a file at../../../../public/logo.ico (a path escaping the package root into a host application\u0027s public assets), DES-decrypts the bytes with a hardcoded password \u0027bf497c0b9cee\u0027 using multiple CryptoJS decode formats, and pipes the decrypted plaintext into a detached, unref\u0027d \u0027node\u0027 subprocess via stdin. The decrypted content is treated as executable JavaScript with no signature check, integrity verification, or user gate. The loader is disguised behind cover-story identifiers (\u0027readLogoIco\u0027, \u0027ThetaSDK initialization\u0027). The symmetric key ships alongside the loader, so the encryption serves only to defeat static inspection of the staged payload. The out-of-package path indicates the payload is dropped separately alongside a host application, making the on-disk blob attacker-controlled from the installer\u0027s perspective.\n",
"id": "MAL-2026-14347",
"modified": "2026-08-21T04:50:44Z",
"published": "2026-08-21T04:21:28Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/mcq-session/v/1.0.4"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/mcq-session/v/1.0.3"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in mcq-session (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.
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.
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