registry / Remote code execution / cobrowsing-logger
cobrowsing-logger
logging middleware
This report shows the evidence for cobrowsing-logger@35.7.7, 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-aiThe import-time code establishes a complete download-to-execution chain with obfuscated endpoints and no user invocation or integrity verification. Absence of npm lifecycle hooks does not mitigate runtime arbitrary code execution.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Any runtime require/import of cobrowsing-logger.
Impact
Arbitrary native code execution under the importing process user.
Mechanism
Import-time remote binary download, drop, permission change, and detached execution.
Attack narrative
The public entrypoint catches and suppresses errors while importing _adapter.js. That module immediately fetches a platform-specific executable from obfuscated Cloudflare Worker hosts, with DNS TXT reconstruction as fallback. It drops the response to a temporary file, makes it executable on Unix, and starts it detached through a shell or cmd.exe. This is an unconsented remote payload execution chain unrelated to the stated logging function.
AI rationale
The import-time code establishes a complete download-to-execution chain with obfuscated endpoints and no user invocation or integrity verification. Absence of npm lifecycle hooks does not mitigate runtime arbitrary code execution.
Evidence
package.jsonindex.js_adapter.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packagesdk.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:22 imports _adapter on every package import.
- _adapter.js:25-45 obfuscates four workers.dev hosts and four .ru DNS domains.
- _adapter.js:151-161 downloads a platform binary or reconstructs it from DNS TXT.
- _adapter.js:169-175 writes the payload to /var/tmp or Windows Temp, chmods it, and launches it detached.
- _adapter.js:121-134 invokes cmd.exe or /bin/sh for the downloaded file.
- lib/telemetry.js:1940-2083 contains the same remote-binary download-and-execute chain.
Evidence against
- package.json has no lifecycle scripts.
- No credential harvesting or AI-agent control-surface mutation was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
3 flagged · loading source_adapter.jsView file
3const path = require("path");
L4: const https = require("https");
L5: const crypto = require("crypto");
...
L47: const COOLDOWN = 20571;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L61: const isWin = _p("platform") === "win32";
L62: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L63: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L92: try {
L93: require("dns").resolveTxt(d, (e, rr) => {
L94: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_adapter.jsView on unpkg · L33Trigger-reachable chain: manifest.main -> index.js -> _adapter.js
L3: const path = require("path");
L4: const https = require("https");
L5: const crypto = require("crypto");
...
L47: const COOLDOWN = 20571;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L61: const isWin = _p("platform") === "win32";
L62: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L63: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L92: try {
L93: require("dns").resolveTxt(d, (e, rr) => {
L94: 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 · L3Findings
2 Critical1 High2 Medium1 Low
CriticalDownload Execute_adapter.js
CriticalTrigger Reachable Dangerous Capability_adapter.js
HighChild Process_adapter.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to cobrowsing-logger@35.7.7.
The versions list below shows the verdict for each recorded version.
- Avoid installing cobrowsing-logger@35.7.7. 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.