100+ Malicious Chrome Extensions Discovered Stealing Data and Hijacking Browsers

Cybersecurity researchers have uncovered a large-scale malicious campaign involving 108 Google Chrome extensions designed to steal user data and manipulate browser activity.

Security News 3 min read

100+ Malicious Chrome Extensions Discovered Stealing Data and Hijacking Browsers

Cybersecurity researchers have uncovered a large-scale malicious campaign involving 108 Google Chrome extensions designed to steal user data and manipulate browser activity.

The campaign reveals a critical risk:

Even trusted browser extensions can silently compromise your identity, sessions, and browsing activity.

What was discovered?

A cluster of 108 Chrome extensions was found to be:

  • Connected to the same command-and-control (C2) infrastructure
  • Published under multiple fake developer identities
  • Installed over 20,000 times via the Chrome Web Store

Fake publishers include:

  • Yana Project
  • GameGen
  • SideGames
  • Rodeo Games
  • InterAlt

What these extensions do

These extensions go far beyond simple data collection.

Researchers identified multiple malicious capabilities:

Credential & identity theft

  • Steal Google account data via OAuth2
  • Capture:
    • Email
    • Full name
    • Profile picture
    • Account ID

Session hijacking

  • Exfiltrate Telegram Web sessions every 15 seconds
  • Replace user sessions with attacker-controlled sessions

Browser manipulation

  • Inject scripts into every visited website
  • Open arbitrary URLs on browser startup
  • Strip security protections from websites

Ad injection & abuse

  • Inject ads and gambling overlays
  • Modify YouTube and TikTok behavior
  • Proxy translation traffic through attacker servers

How the attack works

The extensions disguise themselves as legitimate tools, such as:

  • Telegram clients
  • Browser utilities
  • Translation tools
  • Games (e.g., racing, slot machines)
  • YouTube/TikTok enhancers

👉 Once installed, malicious code runs silently in the background, giving attackers full control over browser activity.

Shared infrastructure

All 108 extensions communicate with the same backend server:

👉 144.126.135[.]238

This centralized infrastructure enables:

  • Data exfiltration
  • Command execution
  • Coordinated control across all infected browsers

Attribution clues

While the exact threat actor remains unknown:

  • Source code contains Russian-language comments
  • Suggesting possible regional links

Why this is dangerous

This campaign highlights a major security blind spot:

Browser extensions operate with high privileges — often with minimal user scrutiny.

Once installed, they can:

  • Access all browsing data
  • Modify web content
  • Interact with authentication sessions

👉 Effectively acting as persistent spyware inside the browser


What users should do immediately

1. Remove suspicious extensions

Especially unknown or rarely used ones

2. Log out of active sessions

Particularly:

  • Telegram Web
  • Google accounts

3. Review installed extensions

Check permissions and publisher credibility

4. Use minimal extensions

Only install what is absolutely necessary

5. Enable security monitoring

Use endpoint/browser protection where possible


Key takeaway

This campaign reinforces a critical lesson:

Your browser is part of your attack surface — and extensions are often the weakest link.

Even official marketplaces like the Chrome Web Store
can be abused to distribute stealthy, large-scale threats.

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