Security Alert: Confirmed Malware

This extension was removed from the Chrome Web Store as malware. Do not install it.Extension: Web Client for Youtube™ - SideYou

CRITICAL RISKRemoved from Chrome Web Store

Web Client for Youtube™ - SideYou

ID: bfoofgelpmalhcmedaaeogahlmbkopfd

Could be malicious

Supported Languages

🇸🇦Arabic

🇧🇬Bulgarian

🇨🇳Chinese (Simplified)

🇹🇼Chinese (Traditional)

🇭🇷Croatian

🇨🇿Czech

🇩🇰Danish

🇳🇱Dutch

🇺🇸English

🇪🇪Estonian

🇵🇭Filipino

🇫🇮Finnish

🇫🇷French

🇩🇪German

🇬🇷Greek

🇮🇱Hebrew

🇭🇺Hungarian

🇮🇩Indonesian

🇮🇹Italian

🇯🇵Japanese

🇰🇷Korean

🇱🇻Latvian

🇱🇹Lithuanian

🇳🇴Norwegian

🇮🇷Persian

🇵🇱Polish

🇷🇴Romanian

🇷🇺Russian

🇷🇸Serbian

🇸🇰Slovak

🇸🇮Slovenian

🇪🇸Spanish

🇸🇪Swedish

🇹🇭Thai

🇹🇷Turkish

🇺🇦Ukrainian

🇻🇳Vietnamese

Extension Info & Metadata

Status

Removed

Version

2.0.9

Size

0.75 MB

Rating

5.0/5

Reviews

Users

Type

Extension

Updated

Jun 25, 2024

Publisher Contextual Analysis

Author: YanaProjectView Profile
Privacy: Privacy Policy
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Website: Visit

Total Extensions

Active

Obsolete

Listed

Unlisted

Total Users

3,313

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Run web client for Youtube™ just like your favorite mobile app.

This extension allows you to use the web version of YouTube in Chrome just like your favorite mobile app. It provides a user-friendly interface and features similar to the mobile version, enhancing the browsing experience for watching videos directly in your browser.

User Growth

Showing data from Jun 25, 2024 to Jun 25, 2025

Versions

+15.87%(+10 users)

Compared to 3 months ago

1 version released in this period

Rating Count

Total: 1 ratings

Average Rating

Current: 5.00 / 5.0+5.00

Extracted Data

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By severity

Critical2

High2

Medium2

Low0

Versions scanned

Showing 1 of 1 scanned version with more than one unique finding. Counts are unique findings that include each version.

Extension Version	Code Review Findings
2.0.9 Code review	6

Extension Version	Code Review Findings
2.0.9	6

Files with findings

4 distinct paths — top paths by unique finding count:

background.js2
sys-content.js2
rules_1.json1
ukraine.html1

S.No.	Category	Severity	File	Summary	Found in Version
1	Code Injection	critical	sys-content.js (line 3679)	The YouTube content script (injected at document_start on all youtube.com URLs) appends a fixed-position promotional banner that loads an image and click-through link to the third-party domain multiaccount.cloudapi.st…	2.0.9
2	Network Interception	critical	rules_1.json (line 14)	Declarative Net Request rule strips Content-Security-Policy, CSP-Report-Only, and X-Frame-Options response headers from all youtube.com traffic and forces wildcard CORS, while spoofing Origin/Referer/Sec-Fetch-* reque…	2.0.9
3	Tracking	high	sys-content.js (line 3715)	Uses YouTube's localStorage to persist a display timestamp and enforce a 10-minute throttle for the injected promo. Polling every 60 seconds means the content script remains active on every YouTube tab indefinitely, t…	2.0.9
4	Tracking	high	background.js (line 6188)	On install the background service worker opens a tab to cloudapi.stream/install and registers an uninstall URL to cloudapi.stream/uninstall, both tagged with action=youtube. Combined with the random per-install user I…	2.0.9
5	Obfuscation	medium	ukraine.html (line 12)	The bundled privacy policy shipped inside this "Web Client for YouTube - SideYou" extension is actually the privacy policy of a different product (Telegram Sidebar Chrome Extension) and lists a free-mail contact (kiev…	2.0.9
6	Unauthorized Data Collection	medium	background.js (line 6175)	Generates a random alphanumeric user identifier, randomly upper-cases characters, and persists it to chrome.storage as storage.user.id on first run. This is a stable device/install fingerprint that has no functional p…	2.0.9

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URLs

IPv4

IPv6

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

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www.w3.org	/1999/02/22-rdf-syntax-ns	http://www.w3.org/1999/02/22-rdf-syntax-ns#
ns.adobe.com	/xap/1.0/	http://ns.adobe.com/xap/1.0/
ns.adobe.com	/xap/1.0/mm/	http://ns.adobe.com/xap/1.0/mm/
ns.adobe.com	/xap/1.0/sType/ResourceRef	http://ns.adobe.com/xap/1.0/sType/ResourceRef#
www.w3.org	/2000/svg	http://www.w3.org/2000/svg
www.w3.org	/1999/xlink	http://www.w3.org/1999/xlink
multiaccount.cloudapi.stream	/game.html	https://multiaccount.cloudapi.stream/game.html
multiaccount.cloudapi.stream	/game_image.jpg	https://multiaccount.cloudapi.stream/game_image.jpg
clients2.google.com	/service/update2/crx	https://clients2.google.com/service/update2/crx
*.youtube.com	/*	https://.youtube.com/

Showing 1 to 10 of 20 rows

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125.0.0.0	IPv4	-

Version History

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Browse and explore files within this extension package

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Security Alert: Confirmed Malware

Web Client for Youtube™ - SideYou

Supported Languages

Extension Info & Metadata

Publisher Contextual Analysis

Chrome Web Store Metadata

Screenshots & Videos

About this extension

Analytics & Metrics

User Growth

Rating Count

Average Rating

Static Code Security Analysis

Extracted Data

Code Review Findings Summary Across 1 Version6

Versions scanned

Files with findings

Extracted Indicators (URLs and IPs)

URLs

Contextual Analysis

Version History

Version-to-Version Code Diff

Extension Files

User Growth

Rating Count

Average Rating