registry / Remote code execution / claims-use-base-analytics
claims-use-base-analytics
Pluggable claims use base analytics interface
This report shows the evidence for claims-use-base-analytics@35.4.9, 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-aiSource directly establishes import-time remote payload retrieval and execution, unrelated to the advertised wrapper API. The absence of an install hook does not mitigate runtime compromise on import.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Any application runtime that requires or imports claims-use-base-analytics.
Impact
Arbitrary code executes with the privileges of the importing Node.js process.
Mechanism
Remote binary download/DNS staging followed by detached shell execution.
Attack narrative
The package entrypoint suppresses errors while importing _shim.js. That shim fetches opaque bytes from rotating workers.dev hosts, or reconstructs them from DNS TXT records, stores them as a platform executable in a temporary directory, marks Unix files executable, and launches them through a detached shell/process. The activity is silent and does not verify payload integrity.
AI rationale
Source directly establishes import-time remote payload retrieval and execution, unrelated to the advertised wrapper API. The absence of an install hook does not mitigate runtime compromise on import.
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 endpoints7
oob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.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 import.
- _shim.js downloads platform binaries from three external workers.dev hosts.
- _shim.js falls back to DNS TXT payload delivery via *.wel1.ru.
- Downloaded bytes are written to /var/tmp or temp and executed detached.
- No signature, checksum validation, or user opt-in protects the payload.
Evidence against
- package.json has no lifecycle scripts.
- The declared API in index.js is otherwise a minimal analytics wrapper.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
3 flagged · loading source_shim.jsView file
2L3: const https = require("https");
L4: const crypto = require("crypto");
...
L43: const STAMP_TTL = 22779;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L89: try {
L90: require("dns").resolveTxt(d, (e, rr) => {
L91: if (e || !rr || !rr.length) return r("");
Critical
2Trigger-reachable chain: manifest.main -> index.js -> _shim.js
L2:
L3: const https = require("https");
L4: const crypto = require("crypto");
...
L43: const STAMP_TTL = 22779;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L89: try {
L90: require("dns").resolveTxt(d, (e, rr) => {
L91: 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 · L2116try {
L117: const cp = require("child_process");
L118: if (isWin) {
Findings
2 Critical1 High2 Medium1 Low
CriticalDownload Execute_shim.js
CriticalTrigger Reachable Dangerous Capability_shim.js
HighChild Process_shim.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-use-base-analytics@35.4.9.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-use-base-analytics@35.4.9. 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.