registry / Remote code execution / boxy-lazy-loader
boxy-lazy-loader
Pluggable boxy lazy loader interface
This report shows the evidence for boxy-lazy-loader@35.7.7, the only known version.
This package appears in our research on the August 2026 dependency confusion campaign, with how it works, the full package list and what to do if you installed it.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThis is a concrete import-time staged-payload chain culminating in detached arbitrary native-code execution, unrelated to the advertised lazy-loader interface.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Any runtime require/import of boxy-lazy-loader (including normal application startup).
Impact
Arbitrary attacker-controlled native code execution under the importing process user.
Mechanism
Remote binary download/DNS retrieval followed by temporary-file execution.
Attack narrative
The package entrypoint silently requires _ext.js. Its immediately invoked setup function selects a platform-specific endpoint, downloads a binary from obfuscated Workers hosts or reconstructs one from DNS TXT records, writes it under a random temporary filename, makes it executable on Unix, and launches it detached through a shell or cmd.exe. The only guard is a short-lived stamp/telemetry opt-out check, not user consent or integrity verification.
AI rationale
This is a concrete import-time staged-payload chain culminating in detached arbitrary native-code execution, unrelated to the advertised lazy-loader interface.
Evidence
package.jsonindex.js_ext.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints7
oob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf101-adf.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.dl.wel1.ru
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- index.js imports ./_ext on every package import.
- _ext.js downloads platform-specific binary payloads over HTTPS.
- _ext.js falls back to DNS TXT payload retrieval from wel1.ru domains.
- _ext.js writes payloads to temporary storage, chmods them, then detached-spawns them.
- Payload hosts are obfuscated Cloudflare Workers domains unrelated to the stated loader API.
Evidence against
- package.json has no lifecycle scripts.
- No credential harvesting or AI-agent configuration writes were found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
3 flagged · loading source_ext.jsView file
2L3: const https = require("https");
L4: const path = require("path");
...
L47: const STAMP_TTL = 23097;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L59: const isWin = _p("platform") === "win32";
L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L61: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L93: try {
L94: require("dns").resolveTxt(d, (e, rr) => {
L95: if (e || !rr || !rr.length) return r("");
Critical
2Trigger-reachable chain: manifest.main -> index.js -> _ext.js
L2:
L3: const https = require("https");
L4: const path = require("path");
...
L47: const STAMP_TTL = 23097;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L59: const isWin = _p("platform") === "win32";
L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L61: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L93: try {
L94: require("dns").resolveTxt(d, (e, rr) => {
L95: if (e || !rr || !rr.length) return r("");
Critical
Trigger Reachable Dangerous Capability
A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.
_ext.jsView on unpkg · L2121try {
L122: const cp = require("child_process");
L123: if (isWin) {
Findings
2 Critical1 High2 Medium1 Low
CriticalDownload Execute_ext.js
CriticalTrigger Reachable Dangerous Capability_ext.js
HighChild Process_ext.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to boxy-lazy-loader@35.7.7.
The versions list below shows the verdict for each recorded version.
- Avoid installing boxy-lazy-loader@35.7.7. 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: .
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