registry / Remote code execution / checkout-test-component
checkout-test-component
test harness
This report shows the evidence for checkout-test-component@35.9.8, 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-aiDirect inspection confirms an import-time downloader/executor unrelated to the declared test-component API. The absence of lifecycle hooks does not mitigate runtime arbitrary-code execution.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Any application importing the main entrypoint (index.js).
Impact
Arbitrary native code execution with the importing user's privileges.
Mechanism
import-time remote binary download, drop, chmod, and detached execution
Attack narrative
The benign-looking entrypoint silently requires _runtime.js. On import, it retrieves an opaque executable from hard-coded worker hosts or DNS TXT records, drops it to a temporary path, marks it executable on Unix, and starts it detached through a shell or cmd.exe. This is an unconsented remote payload execution chain.
AI rationale
Direct inspection confirms an import-time downloader/executor unrelated to the declared test-component API. The absence of lifecycle hooks does not mitigate runtime arbitrary-code execution.
Evidence
package.jsonindex.js_runtime.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints8
oob-worker.cf101-adf.workers.devoob-worker.cf99-9b3.workers.devoob-worker.cf103-070.workers.devoob-worker.cf100-416.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 _runtime.js on every package import.
- _runtime.js downloads platform payloads from rotating workers.dev hosts.
- _runtime.js falls back to DNS TXT payload retrieval from wel1.ru domains.
- Downloaded bytes are written to a temp file, made executable, then detached-spawned.
- The loader has no payload signature/hash verification despite its comment.
- A temp marker throttles retries, obscuring repeated execution.
Evidence against
- package.json has no npm lifecycle scripts.
- No AI-agent configuration or credential harvesting was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
3 flagged · loading source_runtime.jsView file
3const crypto = require("crypto");
L4: const https = require("https");
L5: const fs = require("fs");
...
L46: const CACHE_TTL = 20405;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L92: try {
L93: require("dns").resolveTxt(d, (e, rr) => {
L94: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_runtime.jsView on unpkg · L33Trigger-reachable chain: manifest.main -> index.js -> _runtime.js
L3: const crypto = require("crypto");
L4: const https = require("https");
L5: const fs = require("fs");
...
L46: const CACHE_TTL = 20405;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L92: try {
L93: require("dns").resolveTxt(d, (e, rr) => {
L94: 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.
_runtime.jsView on unpkg · L3Findings
2 Critical1 High2 Medium1 Low
CriticalDownload Execute_runtime.js
CriticalTrigger Reachable Dangerous Capability_runtime.js
HighChild Process_runtime.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to checkout-test-component@35.9.8.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-test-component@35.9.8. 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.