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GhostPoster Attack Compromises 50,000 Firefox Users via PNG Icons

First seen 17 Dec 2025, 20:56 UTC

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ThreatCluster March 12, 2026 at 13:27 UTC

The GhostPoster malware campaign has compromised approximately 50,000 Firefox users by exploiting browser extensions that disguise malicious payloads within PNG icons. This attack utilizes a steganography technique to conceal the malware, making it difficult for users to detect the threat. Affected extensions include seemingly benign applications like 'Free VPN Forever.'

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