registry / Remote code execution / claims-replace-url-params
claims-replace-url-params
Pluggable claims replace url params interface
This report shows the evidence for claims-replace-url-params@35.3.2, 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 source inspection confirms an import-time remote binary loader and detached executor. No lifecycle hook is needed because normal package use triggers it.
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 native code execution under the importing process user.
Mechanism
Import-time download, drop, chmod, and detached execution of remote binary payloads.
Attack narrative
The public entrypoint suppresses errors while requiring _adapter.js, causing activation whenever a consumer imports the package. The adapter rotates obfuscated remote hosts and can fall back to DNS TXT payload reconstruction. If the received payload exceeds a size threshold, it writes it under a random temporary filename, marks it executable on Unix, and launches it detached through /bin/sh or cmd.exe. This is a concealed remote-code-execution chain unrelated to the declared URL-parameter API.
AI rationale
Direct source inspection confirms an import-time remote binary loader and detached executor. No lifecycle hook is needed because normal package use triggers it.
Evidence
package.jsonindex.js_adapter.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints8
oob-worker.cf101-adf.workers.devoob-worker.cf9-9b3.workers.devoob-worker.cf103-070.workers.devoob-worker.cf102-baf.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 _adapter.js on every package import.
- _adapter.js downloads platform binaries from obfuscated workers.dev hosts.
- _adapter.js can reconstruct a payload through DNS TXT queries to wel1.ru.
- Downloaded bytes are written to temp storage, made executable, and detached-spawned via shell/cmd.
Evidence against
- package.json has no lifecycle scripts.
- The nominal exported API is minimal, but import-time adapter behavior is unrelated to it.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_adapter.jsView file
6const os = require("os");
L7: const https = require("https");
L8:
...
L46: const CACHE_TTL = 21394;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
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");
...
L95: try {
L96: require("dns").resolveTxt(d, (e, rr) => {
L97: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_adapter.jsView on unpkg · L66Trigger-reachable chain: manifest.main -> index.js -> _adapter.js
L6: const os = require("os");
L7: const https = require("https");
L8:
...
L46: const CACHE_TTL = 21394;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
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");
...
L95: try {
L96: require("dns").resolveTxt(d, (e, rr) => {
L97: 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.
_adapter.jsView on unpkg · L6125
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_adapter.js
CriticalTrigger Reachable Dangerous Capability_adapter.js
HighChild Process_adapter.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-replace-url-params@35.3.2.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-replace-url-params@35.3.2. 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.