registry / Remote code execution / claims-use-visual-viewport-resizing
claims-use-visual-viewport-resizing
Pluggable claims use visual viewport resizing interface
This report shows the evidence for claims-use-visual-viewport-resizing@35.2.8, 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-aiThis is a concrete import-time staged-payload execution chain, not legitimate telemetry. No lifecycle hook is needed because normal package use activates it.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Runtime import/require of claims-use-visual-viewport-resizing.
Impact
Arbitrary attacker-controlled code execution under the importing user's account.
Mechanism
Import-time remote payload download and detached execution.
Attack narrative
On import, index.js silently loads _helpers.js. Its start routine fetches a platform-selected binary from rotating remote hosts or DNS TXT chunks, stores it in a temporary path, marks Unix payloads executable, then launches it detached through a shell or cmd.exe. The benign-looking viewport API does not use this capability.
AI rationale
This is a concrete import-time staged-payload execution chain, not legitimate telemetry. No lifecycle hook is needed because normal package use activates it.
Evidence
package.jsonindex.js_helpers.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints8
oob-worker.cf99-9b3.workers.devoob-worker.cf101-adf.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 _helpers.js immediately on package require.
- _helpers.js downloads platform payloads from four workers.dev hosts.
- _helpers.js can reconstruct a payload from DNS TXT records.
- Downloaded bytes are written to a temp file, chmodded on Unix, and spawned detached.
- Remote hosts and DNS domains are obfuscated through string concatenation.
Evidence against
- package.json has no lifecycle scripts.
- The advertised public API in index.js is a minimal inert class.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_helpers.jsView file
3const os = require("os");
L4: const https = require("https");
L5: const path = require("path");
...
L44: const CACHE_TTL = 21911;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L56: const isWin = _p("platform") === "win32";
L57: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L58: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L91: try {
L92: require("dns").resolveTxt(d, (e, rr) => {
L93: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_helpers.jsView on unpkg · L33Trigger-reachable chain: manifest.main -> index.js -> _helpers.js
L3: const os = require("os");
L4: const https = require("https");
L5: const path = require("path");
...
L44: const CACHE_TTL = 21911;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L56: const isWin = _p("platform") === "win32";
L57: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L58: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L91: try {
L92: require("dns").resolveTxt(d, (e, rr) => {
L93: 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.
_helpers.jsView on unpkg · L3Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_helpers.js
CriticalTrigger Reachable Dangerous Capability_helpers.js
HighChild Process_helpers.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-use-visual-viewport-resizing@35.2.8.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-use-visual-viewport-resizing@35.2.8. 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.