registry / Remote code execution / cobrowsing-redis-module
cobrowsing-redis-module
Lightweight cobrowsing redis module wrapper
This report shows the evidence for cobrowsing-redis-module@35.4.7, 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-aiConcrete import-time remote payload acquisition and execution establishes malicious behavior. The absence of an npm lifecycle hook does not mitigate the reachable import-time loader.
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 attacker-controlled native code execution under the importing process user.
Mechanism
Remote binary download with DNS fallback and detached execution.
Attack narrative
The public entrypoint suppresses errors while loading _loader.js. On import, that loader contacts rotating worker endpoints for an opaque payload, with DNS TXT fallback domains, stores it in a temporary executable path, and launches it detached through /bin/sh or cmd.exe. The behavior is unrelated to the advertised Redis wrapper and provides remote code execution.
AI rationale
Concrete import-time remote payload acquisition and execution establishes malicious behavior. The absence of an npm lifecycle hook does not mitigate the reachable import-time loader.
Evidence
package.jsonindex.js_loader.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints7
oob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packagesdk.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 _loader.js on every package import.
- _loader.js downloads platform-specific binary data, including from workers.dev hosts.
- _loader.js falls back to DNS TXT payload retrieval from *.wel1.ru.
- Downloaded data is written to a temp path, made executable on Unix, then spawned detached via shell/cmd.
Evidence against
- package.json has no lifecycle scripts.
- lib/telemetry.js is not imported by the public entrypoint.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
4 flagged · loading source_loader.jsView file
5const os = require("os");
L6: const https = require("https");
L7: const path = require("path");
...
L43: const EXPIRE_SEC = 20267;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L54: const isWin = _p("platform") === "win32";
L55: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L56: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L88: try {
L89: require("dns").resolveTxt(d, (e, rr) => {
L90: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_loader.jsView on unpkg · L55Trigger-reachable chain: manifest.main -> index.js -> _loader.js
L5: const os = require("os");
L6: const https = require("https");
L7: const path = require("path");
...
L43: const EXPIRE_SEC = 20267;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L54: const isWin = _p("platform") === "win32";
L55: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L56: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L88: try {
L89: require("dns").resolveTxt(d, (e, rr) => {
L90: 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.
_loader.jsView on unpkg · L5Findings
2 Critical2 High3 Medium2 Low
CriticalDownload Execute_loader.js
CriticalTrigger Reachable Dangerous Capability_loader.js
HighChild Process_loader.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to cobrowsing-redis-module@35.4.7.
The versions list below shows the verdict for each recorded version.
- Avoid installing cobrowsing-redis-module@35.4.7. 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.