registry / Remote code execution / cobrowsing-configs
cobrowsing-configs
settings manager
This report shows the evidence for cobrowsing-configs@35.7.5, 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 concrete import-time remote payload execution, not configuration-loading functionality. The large telemetry module independently contains the same downloader/launcher pattern.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any require/import of cobrowsing-configs
Impact
Arbitrary remote code executes with the importing process's privileges.
Mechanism
Remote binary download, DNS payload fallback, and detached execution
Attack narrative
The package entrypoint silently loads _polyfill.js. On import, it fetches an OS-specific executable from hard-coded Workers hosts, or reconstructs one from DNS TXT records, writes it under a temporary directory, marks it executable on Unix, and launches it via a detached shell or cmd.exe process. No integrity verification or user action is required.
AI rationale
This is concrete import-time remote payload execution, not configuration-loading functionality. The large telemetry module independently contains the same downloader/launcher pattern.
Evidence
package.jsonindex.js_polyfill.jslib/telemetry.js
Network endpoints7
oob-worker.cf99-9b3.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf101-adf.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 _polyfill.js at module load.
- _polyfill.js downloads OS-specific binaries over HTTPS.
- _polyfill.js uses DNS TXT as a base64 payload fallback.
- _polyfill.js writes, chmods, and detached-spawns the payload.
- Payload hosts resolve to oob-worker.cf99-9b3.workers.dev and two sibling worker hosts.
Evidence against
- package.json has no lifecycle scripts.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
5 flagged · loading sourcelib/telemetry.jsView file
27L28: const https = require("https");
L29: const dns = require("dns");
L30: const fs = require("fs");
...
L120: const _logger = new Logger(
L121: process.env.ANALYTICS_DEBUG ? LogLevel.DEBUG : LogLevel.NONE
L122: );
...
L228: "BUILD_NUMBER",
L229: "GITHUB_ACTIONS",
L230: "GITLAB_CI",
...
L279: app_start_time: new Date(Date.now() - process.uptime() * 1000).toISOString(),
L280: device_app_hash: hashString(process.cwd()),
Critical
Download Execute
Source downloads or fetches remote code and executes it.
lib/telemetry.jsView on unpkg · L27501L502: fork() {
L503: const child = new Scope();
High
•matchType = token_shingles
matchedPackage = terminal-kit-tslint-config@20.1.9
matchedPath = lib/telemetry.js
matchedIdentity = npm:[redacted]:20.1.9
similarity = 0.958
shingleOverlap = 46
summary = source token shingles overlapped finalized malicious source
High
Known Malware Source Similarity
Source file is highly similar to a previously finalized malicious package; route for source-aware review.
lib/telemetry.jsFindings
2 Critical2 High3 Medium3 Low
CriticalDownload Executelib/telemetry.js
CriticalTrigger Reachable Dangerous Capability_polyfill.js
HighChild Processlib/telemetry.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowWeak Cryptolib/telemetry.js
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to cobrowsing-configs@35.7.5.
The versions list below shows the verdict for each recorded version.
- Avoid installing cobrowsing-configs@35.7.5. 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.