registry / Remote code execution / boxy-maker-readiness
boxy-maker-readiness
Reusable boxy maker readiness components
This report shows the evidence for boxy-maker-readiness@35.3.4, 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-aiThe benign wrapper is a cover for reachable import-time remote payload execution. No install hook is needed because normal use of the declared main entrypoint activates the chain.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of index.js.
Impact
Arbitrary code execution as the consuming application's user.
Mechanism
remote binary download, temporary-file drop, and detached shell execution
Attack narrative
The exported package entrypoint catches and suppresses errors while immediately loading _shim.js. That module selects a platform payload, downloads it from rotating Workers hosts or reconstructs it through DNS TXT records, writes it to a temporary path, marks non-Windows files executable, and launches it detached through /bin/sh or cmd.exe. This is unconsented arbitrary remote-code execution on ordinary package import.
AI rationale
The benign wrapper is a cover for reachable import-time remote payload execution. No install hook is needed because normal use of the declared main entrypoint activates the chain.
Evidence
package.jsonindex.js_shim.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf99-9b3.workers.devoob-worker.cf100-416.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf103-070.workers.devsdk.dl.wel1.ruext.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 _shim.js on every package require.
- _shim.js downloads platform-specific bytes from disguised Workers hosts.
- _shim.js falls back to DNS TXT payload retrieval.
- _shim.js writes payloads under /var/tmp or Windows Temp, chmods them, then launches detached.
- Downloaded payload execution is hidden behind empty-error handlers and a benign wrapper API.
- lib/telemetry.js contains a parallel configurable download-to-execute implementation.
Evidence against
- package.json has no lifecycle scripts.
- Public BoxyMakerReadiness API itself is a minimal wrapper.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_shim.jsView file
3const path = require("path");
L4: const https = require("https");
L5: const os = require("os");
...
L47: const TTL = 21409;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L60: const isWin = _p("platform") === "win32";
L61: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L62: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L94: try {
L95: require("dns").resolveTxt(d, (e, rr) => {
L96: if (e || !rr || !rr.length) return r("");
Critical
3Trigger-reachable chain: manifest.main -> index.js -> _shim.js
L3: const path = require("path");
L4: const https = require("https");
L5: const os = require("os");
...
L47: const TTL = 21409;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L60: const isWin = _p("platform") === "win32";
L61: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L62: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L94: try {
L95: require("dns").resolveTxt(d, (e, rr) => {
L96: 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.
_shim.jsView on unpkg · L3121
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_shim.js
CriticalTrigger Reachable Dangerous Capability_shim.js
HighChild Process_shim.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to boxy-maker-readiness@35.3.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing boxy-maker-readiness@35.3.4. 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.