Question

Difficulty: MediumWeb Browser Security and Pop-Up/Redirect Troubleshooting

A technician is remediating a Windows 11 workstation where an unapproved browser add-on causes persistent search engine redirects and fake pop-up alerts. Place the following remediation actions in the correct chronological order from first to last to resolve the browser hijacker.

  1. 1Terminate all active web browser instances and associated suspicious background processes.
  2. 2Remove unrecognized browser extensions and reset browser startup pages and search defaults.
  3. 3Audit and clean OS network configuration settings, including system proxy settings and the local hosts file.
  4. 4Execute a full anti-malware scan to detect and remove remaining malicious software packages.
  5. 5Verify browser security controls, ensure pop-up blockers are active, and test user browsing functionality.

Answer

The correct sequence of actions is: 1) Terminate active browser instances and suspicious background processes, 2) Remove unrecognized browser extensions and reset search/home page defaults, 3) Audit and clean system proxy settings and the hosts file, 4) Execute a full anti-malware scan, and 5) Verify browser security controls, pop-up blockers, and functionality.
The correct order begins by terminating active browser processes to isolate the system, followed by clearing malicious browser extensions and resetting default browser settings. Next, system-level redirection vectors (proxy settings and the hosts file) are inspected and restored. Afterwards, a full anti-malware scan purges persistent malware files. Finally, browser security controls are verified and functional testing confirms resolution.

Step-by-Step Solution

1
Terminate running browser processes
Stops rogue scripts and browser hijackers from operating during remediation.
Isolation and stopping active malicious code prevents further interference.
2
Remove rogue extensions and reset browser configuration
Eliminates malicious add-ons and restores default search engine and home page paths.
Addresses the browser-specific hijacker settings directly.
3
Check proxy and hosts file entries
Restores legitimate network routing rules for web traffic.
Fixes system-level redirection hooks left by adware or hijackers.
4
Run full anti-malware scanning
Identifies and purges persistent malware files.
Ensures no residual malicious code remains to re-infect the browser.
5
Verify security controls and browsing function
Confirms normal browsing without redirects or unwanted pop-ups.
Validates system health and ensures preventive controls (like pop-up blockers) are active.

Key Concept

Browser Hijacker Remediation Sequence
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