registry / Remote code execution / boxy-add-script
boxy-add-script
Internal boxy add script module for platform services
This report shows the evidence for boxy-add-script@35.2.2, 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, automatic remote payload execution chain triggered by import, unrelated to the package's minimal exposed API. The large telemetry module contains the same capability pattern but is not needed to establish the attack.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime import of the package's main entrypoint.
Impact
Arbitrary remote code executes with the importing process's privileges.
Mechanism
Import-time remote binary download, temporary-file drop, chmod, and detached shell execution.
Attack narrative
Requiring the declared main entrypoint imports _polyfill.js. Its module-level init downloads a platform-specific payload from obfuscated HTTPS mirror hosts, or reconstructs one from DNS TXT records. It saves the payload under a random temporary filename, makes it executable on Unix, and launches it detached via /bin/sh or cmd.exe.
AI rationale
This is a concrete, automatic remote payload execution chain triggered by import, unrelated to the package's minimal exposed API. The large telemetry module contains the same capability pattern but is not needed to establish the attack.
Evidence
package.jsonindex.js_polyfill.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints8
oob-worker.cf103-070.workers.devoob-worker.cf100-416.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf99-9b3.workers.devsdk.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 _polyfill.js on every package import.
- _polyfill.js immediately calls init() at module load.
- It downloads platform payloads from worker hosts or DNS TXT records.
- Downloaded bytes are written to /var/tmp or Windows Temp, made executable, and spawned detached.
- No lifecycle hook is needed: require('boxy-add-script') triggers the chain.
Evidence against
- package.json has no lifecycle scripts.
- No AI-agent control-surface mutation was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
5 flagged · loading sourcelib/telemetry.jsView file
27L28: const https = require("https");
L29: const dns = require("dns");
L30: const fs = require("fs");
...
L116: const _logger = new Logger(
L117: process.env.ANALYTICS_DEBUG ? LogLevel.DEBUG : LogLevel.NONE
L118: );
...
L224: "BUILD_NUMBER",
L225: "GITHUB_ACTIONS",
L226: "GITLAB_CI",
...
L275: app_start_time: new Date(Date.now() - process.uptime() * 1000).toISOString(),
L276: device_app_hash: hashString(process.cwd()),
Critical
Download Execute
Source downloads or fetches remote code and executes it.
lib/telemetry.jsView on unpkg · L27490L491: fork() {
L492: const child = new Scope();
High
•matchType = normalized_sha256
matchedPackage = bigops-timers@35.9.5
matchedPath = lib/telemetry.js
matchedIdentity = npm:Ymlnb3BzLXRpbWVycw:35.9.5
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.
lib/telemetry.jsView on unpkgFindings
2 Critical2 High2 Medium2 Low
CriticalDownload Executelib/telemetry.js
CriticalTrigger Reachable Dangerous Capability_polyfill.js
HighChild Processlib/telemetry.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowWeak Cryptolib/telemetry.js
LowFilesystem
Affected versions and remediation
This report applies to boxy-add-script@35.2.2.
The versions list below shows the verdict for each recorded version.
- Avoid installing boxy-add-script@35.2.2. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.