mal-2026-6139
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (2e52b15ad9413185c30f84ad7e11e031c74c359e04f5c30ce502b8bc73267d8e)
The package ships a single heavily obfuscated index.js that performs no URL-encoding work despite the package name. On require() of the declared main, top-level invocation of Zt() triggers an HTTP GET to a hardcoded C2 endpoint whose URL is reconstructed from base64 fragments combined via an XOR routine (function H). The response body is written to disk via fs.writeFileSync and executed by child_process.exec / child_process.spawn using process.execPath (the local Node runtime). A second routine mt() POSTs host identifiers — os.hostname(), os.userInfo().username, platform, arch — to the same C2 on every load, and a setInterval re-runs the fetch-and-execute loop approximately every 615 seconds. All sensitive identifiers ('child_process', 'fs', 'exec', 'spawn', 'writeFileSync', 'hostname', 'userInfo', etc.) are concealed as base64 strings with a leading-byte strip, behind an obfuscator.io string-array dispatcher. package.json has empty description, empty author, no repository, and the module exports nothing — the only effect of installing or requiring this package is the dropper. The @httpactions scope and the encode-url name are a lure with no matching functionality.
{
"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": "index.js",
"sha256": "f9026264d06046512d73d8d580f36b273c672cfe2b4652db59d336ca9fb40969",
"tlsh": "fa2266c53ff2b017d220247b382a5256a22f4c84774c4998e62665c4fe5a7b6f0b76dc"
},
{
"path": "package.json",
"sha256": "d09ad41537d0904ccdc70a6372a0ff25c3c5372606568f086ba82f70968f4abc",
"tlsh": "86d0a7382951553305c641120c6ea446b361df2f1044380d87db583c81dfab35cfa31d"
}
],
"package_integrity": [
{
"filename": "encode-url-1.0.0.tgz",
"hashes": {
"sha1": "6804b6c63a962a43d3ed4b7955f5107b3d102824",
"sha512_sri": "sha512-+Z/oUOu4JJyOgzPDB+WPLLXGjSXlKSu1NP1o6x9d9liP0V0gy5blpSwDyWS4jYAoBNxorLXa5nDBYie2iY1Tlg=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "@httpactions/encode-url"
},
"versions": [
"1.0.0",
"1.0.1"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-007014",
"import_time": "2026-06-18T19:20:01.922795314Z",
"modified_time": "2026-06-18T18:39:23Z",
"sha256": "2e52b15ad9413185c30f84ad7e11e031c74c359e04f5c30ce502b8bc73267d8e",
"source": "amazon-inspector",
"versions": [
"1.0.0"
]
},
{
"id": "IN-MAL-2026-007016",
"import_time": "2026-06-18T19:20:02.11522741Z",
"modified_time": "2026-06-18T18:39:28Z",
"sha256": "5c9aa3e781989ddd45fd6b6d1c8eb3d0bfdd7ce29e16865593b4b6bf3d889ed8",
"source": "amazon-inspector",
"versions": [
"1.0.1"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (2e52b15ad9413185c30f84ad7e11e031c74c359e04f5c30ce502b8bc73267d8e)\nThe package ships a single heavily obfuscated index.js that performs no URL-encoding work despite the package name. On require() of the declared main, top-level invocation of Zt() triggers an HTTP GET to a hardcoded C2 endpoint whose URL is reconstructed from base64 fragments combined via an XOR routine (function H). The response body is written to disk via fs.writeFileSync and executed by child_process.exec / child_process.spawn using process.execPath (the local Node runtime). A second routine mt() POSTs host identifiers \u2014 os.hostname(), os.userInfo().username, platform, arch \u2014 to the same C2 on every load, and a setInterval re-runs the fetch-and-execute loop approximately every 615 seconds. All sensitive identifiers (\u0027child_process\u0027, \u0027fs\u0027, \u0027exec\u0027, \u0027spawn\u0027, \u0027writeFileSync\u0027, \u0027hostname\u0027, \u0027userInfo\u0027, etc.) are concealed as base64 strings with a leading-byte strip, behind an obfuscator.io string-array dispatcher. package.json has empty description, empty author, no repository, and the module exports nothing \u2014 the only effect of installing or requiring this package is the dropper. The @httpactions scope and the encode-url name are a lure with no matching functionality.\n",
"id": "MAL-2026-6139",
"modified": "2026-06-18T19:21:54Z",
"published": "2026-06-18T18:39:23Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/@httpactions/encode-url/v/1.0.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/@httpactions/encode-url/v/1.0.1"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in @httpactions/encode-url (npm)"
}
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.