Tagged: GhostPoster

January 5, 2026

The DarkSpectre Files: How a 7-Year Extension Campaign Hijacked 8.8 Million Browsers

A hacking group operating under the name DarkSpectre has, for seven years, systematically infected the computers of users running Chrome, Edge, and Firefox browsers. According to Koi Security, more than 8.8 million unique devices...

Malware

December 18, 2025

Hidden in Plain Sight: How the GhostPoster Campaign Injected Malware Into 50,000 Firefox Users

Researchers at Koi Security have identified a new malicious campaign dubbed GhostPoster, targeting users of the Firefox browser. As part of the operation, attackers distributed extensions that appeared harmless and even amassed tens of...