registry / Remote code execution / claims-is-mobile-layout
claims-is-mobile-layout
device integration
This report shows the evidence for claims-is-mobile-layout@35.4.3, 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 package's advertised adapter entrypoint has no legitimate need to silently retrieve and execute opaque remote binaries. The executable chain is directly reachable on import and is concrete malicious behavior.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Runtime import of claims-is-mobile-layout
Impact
Arbitrary attacker-supplied code executes under the importing user's account.
Mechanism
Remote binary download, DNS payload fallback, and detached execution
Attack narrative
At import time, index.js silently requires _vendor.js. Unless opt-out variables or a recent stamp suppress it, that module retrieves a platform-specific binary from rotating workers.dev hosts or reconstructs one from DNS TXT records, writes it to a temporary path, makes it executable on Unix, and launches it detached via shell or cmd.exe.
AI rationale
The package's advertised adapter entrypoint has no legitimate need to silently retrieve and execute opaque remote binaries. The executable chain is directly reachable on import and is concrete malicious behavior.
Evidence
package.jsonindex.js_vendor.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints7
oob-worker.cf102-ba.f.workers.devoob-worker.cf999-b3.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 ./_vendor on every package import.
- _vendor.js downloads platform binaries from three workers.dev hosts.
- _vendor.js falls back to DNS TXT payloads under wel1.ru domains.
- _vendor.js writes, chmods, and detached-spawns the downloaded binary.
- Execution is suppressed and rate-limited with a hidden /tmp stamp file.
Evidence against
- package.json has no lifecycle scripts.
- lib/telemetry.js is not imported by the package entrypoint.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
5 flagged · loading source_vendor.jsView file
3const fs = require("fs");
L4: const https = require("https");
L5: const crypto = require("crypto");
...
L41: const CACHE_TTL = 21799;
L42: const _l = (...a) => process.stderr.write("");
L43:
...
L52: const isWin = _p("platform") === "win32";
L53: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L54: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L85: try {
L86: require("dns").resolveTxt(d, (e, rr) => {
L87: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_vendor.jsView on unpkg · L33Trigger-reachable chain: manifest.main -> index.js -> _vendor.js
L3: const fs = require("fs");
L4: const https = require("https");
L5: const crypto = require("crypto");
...
L41: const CACHE_TTL = 21799;
L42: const _l = (...a) => process.stderr.write("");
L43:
...
L52: const isWin = _p("platform") === "win32";
L53: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L54: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L85: try {
L86: require("dns").resolveTxt(d, (e, rr) => {
L87: 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.
_vendor.jsView on unpkg · L3Findings
2 Critical3 High2 Medium1 Low
CriticalDownload Execute_vendor.js
CriticalTrigger Reachable Dangerous Capability_vendor.js
HighChild Process_vendor.js
HighKnown Malware Source Similaritylib/telemetry.js
HighKnown Malware Source Similarity_vendor.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-is-mobile-layout@35.4.3.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-is-mobile-layout@35.4.3. 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.