Blog

Natalie Zargarov Published - January 15, 2026

Browser Extensions Gone Rogue: The Full Scope of the GhostPoster Campaign

  Last month, researchers at Koi Security published a detailed analysis of a malicious Firefox extension they dubbed GhostPoster – a browser-based malware leveraging an uncommon and stealthy payload delivery method: steganography within a PNG icon file. This innovative approach allowed the malware to evade traditional extension security reviews and static analysis tools. Following their […]

Learn More
Browser Extensions Gone Rogue: The Full Scope of the GhostPoster Campaign