Malicious code in css-dwsawd-polyfill (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (1c370cda09695e44d06a44bc14d14817edadc047e4dad0314edcfc752be796e9) The package name mimics a Wix thunderbolt polyfill and ships a registry-manifest.min.json that aliases legitimate @wix thunderbolt registry module names to thunderboltRegistry.js. On require, thunderboltRegistry.js runs an IIFE that uses child_process.execSync to execute shell reconnaissance (id, whoami, uname -a, ifconfig/ip addr, /etc/hosts) and fetches http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f with the command outputs plus hostname, pid, platform, node version, and a site identifier as query parameters, tagged 'rce-poc'. A fallback path constructs a fresh Module instance to re-resolve child_process if the require cache is stubbed, ensuring execution. The destination is plain HTTP to an unrelated external host and is not caller-configurable.
MAL-2026-17550
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:MAL-2026-17550
css-dwsawd-polyfill
Source reference: /affected/0/package/name
- Affected versions
- 1.0.0
Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"package": {
"name": "css-dwsawd-polyfill",
"purl": "pkg:npm/css-dwsawd-polyfill",
"ecosystem": "npm"
},
"versions": [
"1.0.0"
],
"database_specific": {
"cwes": [
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
}
],
"source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-dwsawd-polyfill/MAL-2026-17550.json",
"indicators": {
"evidence_files": [
{
"path": "thunderboltRegistry.js",
"tlsh": "e87154a5b99df02065c33438cb7f4049b4bbc6672d6caee0744899b01f7985c01be6f8",
"sha256": "a485cb48081ea590cab385a405886cfe6f30af7d415f30bc8d7937ace461b928"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "ef15ad08c629a871720ac3361d4a8cb32af8a865",
"sha512_sri": "sha512-aD51izXwj5rI+FHut4JDVOSRAnc6akSkrOPliR6OjNLbM3UMS8iuM829TvknAlt8CGUhf+ttjzYb+bJAGLIwpw=="
},
"filename": "css-dwsawd-polyfill-1.0.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #83628 · Revision 1
- Added to Heist Feed
- Publisher date